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Thread: Project Dhoom YD 70 Upgrade to 110cc

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    Question Project Dhoom YD 70 Upgrade to 110cc

    hi
    as the title suggests.. i have undertaken this small project.. so far i have made my bike partially ready.. here is what i have done so far..

    1:installed a 4 wheeler Cylinder of 107cc capacity
    2: and a corresponding Cylinder head..

    both the things were just bolt on fit.. no new timing chain was needed..
    i also upgraded to an after market china carburettor that comes for qingqi 100cc rickshaw.. did nothing to the jets ..mixture is a bit rich but proper setting is needed.current jets are unlabelled. however from spark plug reading mixture is in acceptable range...

    So far results are quite decent...pick is increased . very much..it reaches speeds of 80 in fairly short time..top speed is 90 but it severely vibrates past or close to speeds at 80. current sprockets are 14/41 default..
    UPDATE [17/06/2012]
    after i added the clutch box and sprocket was changed to 15/41 top speed is 100 and no vibrations..
    the new 110cc head is exactly the same as of the chonda 70 only difference is the size of combustion chamber which is slightly enlarged for the 52.4mm cylinder as opposed to the 48mm chamber of chonda 70.. The intake valve is 23mm and the exhaust valve is 20 mm.same values as of default cylinder head of dhoom 70. silencer is the same old of dhoom 70..


    Now i need suggestions/verifications as to what should i do to make it a bit faster.. in-fact not faster but to make the gears longer as at speeds above 60 (definitely in 4th gear) it seems as if it needs to be shifted to next gear..

    Now, one mechanic suggested me to use the following
    1: qinqgi clutch gear..and he said it costs 800-900 rs in new.. DONE
    2: and also to upgrade to 3 discs/plates clutch boxa...( infer for yourself
    what he meant.) DONE
    3:someone also suggested me to open the ports ( portain khuli kara lain) [To be done]
    4: replace the paper type filter element with a foam type ,, [To be done]
    will make a video about the project on what i have done so far.. in a couple of days. and rearrange this thread..

    also suggest a good mechanic..in pindi islamabad..

    thanks..
    ---------------------------------------------
    Some pics of the new cylinder head (110cc)
    This is the combustion chamber of 110cc cylinder..
    Project Dhoom YD 70 Upgrade to 110cc -287370


    Following pic show the scale next to the centre line of a 110cc combustion chamber ..my readings using vernier scale were as follows.
    the inner circle is of 40mm dia same as in dhoom 70 chamber
    the outer is of 52mm dia , 4mm bigger then the chamber of dhoom 70
    depth is same for both..at the center line..
    Project Dhoom YD 70 Upgrade to 110cc -287371

    vernier calliper showing the outer dia.
    Project Dhoom YD 70 Upgrade to 110cc -287372

    110cc cylinder installed.. along with a piston. the piston was partially seized but the mechanic who installed it said it is ok.. many mechanics also said so.. however rings were new. of STR.. the rings which i bought were for 150 rs and they were of zero number from united 100cc bike..(that bike in reality is a 110cc)
    Project Dhoom YD 70 Upgrade to 110cc -287373

    Piston at BDC of the cylinder.
    Project Dhoom YD 70 Upgrade to 110cc -287374

    another view of piston at BDC .
    Project Dhoom YD 70 Upgrade to 110cc -287381

    Piston at TDC. not the piston was flat shaped but there was too much compression.. so we tapper cut the piston.. that's why the piston looks pretty old at centre and clean at the edge... this pic was take after this piston did some 20 Km ...
    Project Dhoom YD 70 Upgrade to 110cc -287382

    Another View of Piston at TDC,
    Project Dhoom YD 70 Upgrade to 110cc -287383

    Picture of Exhaust port from cylinder head.. no silencer installed yet..
    Project Dhoom YD 70 Upgrade to 110cc -287384

    another view of the exhaust port of the cylinder , silence isn't installed yet..
    Project Dhoom YD 70 Upgrade to 110cc -287385

    Project Dhoom YD 70 Upgrade to 110cc -287386
    ---------------------------------------------


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    This is not a boast but I have a 1997 Honda CD 70. It is with my father since 1999, before that it was with my Khalu.
    When we purchased the bike it was clocking 2200 kms. after that my cousin used it till 2009. Never got it tuned in those 9 years but engine oil was changed ever 7-8 months
    In 2009, when the bike was handed over to me it was in terrible condition. The engine was all gone.
    I used it for 1-2k kms and after that got the engine overhauled.
    Running was done by me at the speed of 40-45 max. After completing 1000kms I started to rev the engine higher.
    The results were amazing. The bike used to go up till 85 km/hr in 3rd gear and in the 4th gear, all the way up till 115 km/hr.
    And yes the speedometer was perfectly alright. Synchronized it with many other bikes and even with cars.
    I used that bike for like 3000-4000 kms and after that got a new bike and it was 2008 Honda CD 70.
    Now I use the 2008 CD as my daily driver but in the mean time the bike was parked in my garage.
    My younger brother started riding the old 1997 CD and now when I ride the old one I don't feel the thrill.
    The bike goes till 90 max.
    It seems like its engine is losing power.
    Can you suggest what can I do to restore it to its lost glory.
    Thank you
    I'm not afraid of the Devil,I date his sister

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    Quote Originally Posted by saadabdulrahim View Post
    This is not a boast but I have a 1997 Honda CD 70. It is with my father since 1999, before that it was with my Khalu.
    When we purchased the bike it was clocking 2200 kms. after that my cousin used it till 2009. Never got it tuned in those 9 years but engine oil was changed ever 7-8 months
    In 2009, when the bike was handed over to me it was in terrible condition. The engine was all gone.
    I used it for 1-2k kms and after that got the engine overhauled.
    Running was done by me at the speed of 40-45 max. After completing 1000kms I started to rev the engine higher.
    The results were amazing. The bike used to go up till 85 km/hr in 3rd gear and in the 4th gear, all the way up till 115 km/hr.
    And yes the speedometer was perfectly alright. Synchronized it with many other bikes and even with cars.
    I used that bike for like 3000-4000 kms and after that got a new bike and it was 2008 Honda CD 70.
    Now I use the 2008 CD as my daily driver but in the mean time the bike was parked in my garage.
    My younger brother started riding the old 1997 CD and now when I ride the old one I don't feel the thrill.
    The bike goes till 90 max.
    It seems like its engine is losing power.
    Can you suggest what can I do to restore it to its lost glory.
    Thank you
    i am confused about the last para..
    if u say that the 97 model cd70 is doing max 90 and earlier it did 115 and u want it to do that again.. then in my opinion its perfectly right. as cd 100 max is 100km/hr and that is 30 cc more engine power then 70 plus gear ratios advantage..

    cd 70 on downhill with rider sleeping on it or in downright position can reach max 97 .. that too some old model .. not these new models..

    and 115 on stock rebuilt 70 is difficult in my opinion..
    when i just pass 90 my bike feels as its riding on air .. and its another feeling ... offcourse frightening..

    waiting for a bit clarification on last para..

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    I mean to say that my 1997 CD70 is losing power and goes till 90 kms max. previously it used to do go uptill 115 km/h.
    The only thing I've changed is the chain and sprocket set. I'm using atlas honda engine oil(oil change every month) + tuning after every 3 months. The bike runs not more than 500-700 kms per month.
    I'm not afraid of the Devil,I date his sister

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    well in my opinion u are already getting more then enough speed for this bike ..

    however make sure its properly tuned.. use good filter.adjust tappets properly.make sure there is no leak b/w carb and engine any where... clean and adjust plug.adjust chain. and ensure both wheels are free to rotate.

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    Quote Originally Posted by IceCold View Post
    So a new united 100 cc cylinder and a suzuki 110 cc piston together.....or head, valve etc? or yeh bolt to bolt fit ho jai ga road prince 70 per yah alteration kerwani pera gi?
    70cc > 110cc than how will you amend your motorcycle papers ? han .
    that thing will become illeagel.
    Thanks.

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    there is no inscription on either the cylinder or the cylinder head or the carburetor that is written in papers or documents...

    Quote Originally Posted by Fahd150 View Post
    70cc > 110cc than how will you amend your motorcycle papers ? han .
    that thing will become illeagel.
    Thanks.

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    there are same cc on papers and cylinder ie . 70cc . and some other specifications like bear axel weights . number of passengers to carry.etc

    if we upgrade 70cc to 110cc than the papers should also be amended or otherwise illegitimate.

    what people think they can put 200cc in their 50 cc ?

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    ider mistry ko nai patha hotha udar toolay ko kia patha hoga ka ya kitnay cc ka ha .. hahahaha .. just grind the cc written on it .. if you are that much concerned ..

    i havent done so and no tulla has said anything .. even itp guys .

    technically its illegal ..
    the papers do quote cc's of engine but from the manafacturer and tax viewpoint not from consumer viewpoint..

    in my opinion its the way one handles bikes thats more of concern then whatever cc is it souped up to ..

    have your own way man ..



    Quote Originally Posted by Fahd150 View Post
    there are same cc on papers and cylinder ie . 70cc . and some other specifications like bear axel weights . number of passengers to carry.etc

    if we upgrade 70cc to 110cc than the papers should also be amended or otherwise illegitimate.

    what people think they can put 200cc in their 50 cc ?

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    asjdsm bro jab bhhi mujy challan kartay han mudguards ki wajah se tab , hamasahah engine pe ghor se dekhtay han buri nazro se .....
    trafic walay bhi and police walay bhi ....... shaid yahi dekhtay han mery to khayal se ky , engine bara to nahi laga ?

    anyways we will find other ways ....

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    hahah

    jis na mud guard utharya hothay hain unki tho wo ........... gharzay aik aik cheez check karthay hain .. par meri tara shareef altered bike rider jo hamlet pahna hotha ha and bike looks proper uski tho lift hi nai kartha tulllllllllay

    so to avoid them make your bike in good shape .

    Quote Originally Posted by Fahd150 View Post
    asjdsm bro jab bhhi mujy challan kartay han mudguards ki wajah se tab , hamasahah engine pe ghor se dekhtay han buri nazro se .....
    trafic walay bhi and police walay bhi ....... shaid yahi dekhtay han mery to khayal se ky , engine bara to nahi laga ?

    anyways we will find other ways ....

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    Good work asjdsm! so I am not alone Finnaly!!! .....

    In Lahore their is an Undercover 125 (use to be a 72cc E22 shareef bachon wali bike) which has already smoked sprinter, CD100s, junoons, pridors, shridor, burgers, sandwiches .... soon it will be taking on GD110 too.. it gets head to head with CGs and storms but lacks top speed due to low gear ratio but in short strips its heated acceleration is unmatchable..

    Top speed acheived so far. 106 under best circumstances.. still under evolution, will make a seprate thread once I am done with every thing.




    Project Dhoom YD 70 Upgrade to 110cc -1195336
    The difference of stock Piston with new Cylinder

    Project Dhoom YD 70 Upgrade to 110cc -1195337
    124CC compressor chamber

    Project Dhoom YD 70 Upgrade to 110cc -1195338

    a side view of how wide the Cylinder looks.. engine looks smaller then head Cylinder. LOL!


    Project Dhoom YD 70 Upgrade to 110cc -1195339

    Project Dhoom YD 70 Upgrade to 110cc -1195340



    My This project was influenced after @FC works... thanks FC.
    https://www.pakwheels.com/forums/motorcycle-travel-diaries/277725-sober-riders-visit-khunjerab-adventurous-way-via-nori-pass

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    awesome Vicky2Law (finaly i can say your name from my heart .. earlier it wasnt suitable interpretation )

    yes @FC is no doubt an inspiration to all of us ..

    i have been riding it and have good pick and power .... but the only thing bugging me is that i cannot find a piston that fits stock 13mm con rod and gives me some 9+ CR ..

    i have found one piston of max100 but thats 54mm dia and 13mm wristpin .. but that is very high if deck to deck comparision is made with stock 52.4mm piston that comes in 110cc engines.

    currently in my opinion i am getting 8.66:1 CR .. or may be less then it ..


    i am looking forward for your project .. and i will post two new findings of mine .. which i hope you would have already found and solved if not would help you somehow..

    yes its engine look obsenely big compared to the crankcase ..

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    their are lots of salvaged 125, 150 110 engines of quad bikes in bilal ganj and the trend of modifying E22 is quite in these days...



    Quote Originally Posted by asjdsm View Post
    awesome Vicky2Law (finaly i can say your name from my heart .. earlier it wasnt suitable interpretation )

    yes @FC is no doubt an inspiration to all of us ..
    yea after he showed whats the Karachi guys are doing with there 70s and 125s I was totally comited to do it one day ...

    right now two of my friends funded projects are keeping me in a loop thats why I have been unable to find time to continue further ...
    these are what my friends are dreaming about ...

    A rotten ages dead CD175

    BEFORE
    Project Dhoom YD 70 Upgrade to 110cc -1195911

    Project Dhoom YD 70 Upgrade to 110cc -1195912


    AFTER (STILL UNDER PROGRESS)
    Project Dhoom YD 70 Upgrade to 110cc -1195909

    Project Dhoom YD 70 Upgrade to 110cc -1195910

    waiting for the parts like tanky tappa to arrive from paint Job to continue..

    have to keep equilibrium between Job + Hobby + home Life = VERY hard.
    https://www.pakwheels.com/forums/motorcycle-travel-diaries/277725-sober-riders-visit-khunjerab-adventurous-way-via-nori-pass

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    Quote Originally Posted by asjdsm View Post
    i have been riding it and have good pick and power .... but the only thing bugging me is that i cannot find a piston that fits stock 13mm con rod and gives me some 9+ CR ..
    9+ CR means ? compression ? I haven't measured it so far ... relied to much on my mechanic he is awesome... lol so I have to worry less... I guess you have only swapped the cylender,piston + head only and not the crank/weight ? is that the case ? I hope you are not facing vibrations but I doubt it must not be reving upto 10k RPM becuase the wieght below on crank and the piston size would not be in harmony ?

    which bikes clutch box did you used ? I am using qinqi100's clutch-box set with final reduction sprocket of stock125ccquad bike .. forgot how many tooth it had..

    Quote Originally Posted by asjdsm View Post
    i have found one piston of max100 but thats 54mm dia and 13mm wristpin .. but that is very high if deck to deck comparision is made with stock 52.4mm piston that comes in 110cc engines.

    currently in my opinion i am getting 8.66:1 CR .. or may be less then it ..
    I dont know how it is working in your case because even a 100cc piston needs a increased weight on crank down below .. the head you are using is a bearings based head or uses a Bush based cam in it ? becuase 100cc above need a bearing up there for free flow movement of cam and more lubrication (as heard from mechnic)

    Quote Originally Posted by asjdsm View Post
    i am looking forward for your project .. and i will post two new findings of mine .. which i hope you would have already found and solved if not would help you somehow..
    two main problems I faced so far were the gear box and the carb... even a qinqi, junoon, and sprinter carb didnt did well with jets re done junoon carb did some but not in stock so I had to put a CG125 own Carb which worked finaly with a carb to chamber Bend rebored becuase the stock bend is very narrow and doesn't lets the piston to suck properly.


    secondly 4th gear is eaten up to fastly .. I am using the final drive sprocket of 15 + 36 right now..


    Quote Originally Posted by asjdsm View Post
    yes its engine look obsenely big compared to the crankcase ..
    while assembling the eninge the two crank cases were not joining together becuase of a huge weight of 125cc ... so had to tool Collars from the crack cases to adjust it in...
    https://www.pakwheels.com/forums/motorcycle-travel-diaries/277725-sober-riders-visit-khunjerab-adventurous-way-via-nori-pass

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    you pretty much solved the issues ..
    do make sure that the holes/bores of the carb bend pipes are in perfect harmony with carb and the head .. and not offset ..

    and your assumptions are also correct about my bike ..

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    My target is to keep it as camouflaged as it can be I even don't want some one to recognize a CG carb fitted on it... I mean from looks it should look like a tired old abu ki motor cycle... but can put a 125 rider into confusion how did a 70cc crossed him ... and yes its possible I have seen it in Gujranwala races..

    when @Silver_Knife visited Lahore ... he was in confusion that how come a 70 is cruising so fine while we two bulky riders are on it... then i told him whats under cover and he laughed a lot and said "DANG" now thats really an under cover 125 ...
    @BlueHorn also had a test ride ... he was quite satisfied with the results too.. we initially planned to take it to our recent Galiyat trip but then we planned to test Ravi piaggio up there and took Ravi paiggio instead ..

    by the way I had to replace rear tyre to larger one, and harden the front suspension too...

    I am also not interested to fancy it or make it look cool... NO SIR... Hence "Under Cover 125"

    Quote Originally Posted by asjdsm View Post
    you pretty much solved the issues ..
    do make sure that the holes/bores of the carb bend pipes are in perfect harmony with carb and the head .. and not offset ..

    and your assumptions are also correct about my bike ..
    https://www.pakwheels.com/forums/motorcycle-travel-diaries/277725-sober-riders-visit-khunjerab-adventurous-way-via-nori-pass

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    We are waiting to know the top speed of your byke on any sprocket configuration for which a 110cc engine can bear the load. i like the final reduction ratio of sprockets to be near 2.375 = 38/16 or some thing. for a 110cc.
    Anxious...
    ------------------------------------ALTERATION/MODIFICATION SEPARATE HUMAN FROM BEAST-----------------------------------------

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    with that engine it would reach speeds of 80 kmph pretty quickly in 3rd gear then on a bit long routes it would reach 100kmph +- something.

    but this was with me sitting normal outright . result was same with double sawari.

    the overall gain by these mods was power. it would achieve speeds easily and would maintain it .

    in a bid to do some more mods ( by installing some bigger pistion of max100 ) i bored that 110cc cylinder but also wanted to adjust combustion chamber .. but it was destroyed by kharadia..

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    4stroke gurus aadab
    i killed my dad's cd70 planned to rebuild it , i installed cd100's standard piston in it , its bore is 50mm
    bike is all stock except it , it rides great but only clocks 100kmph at speedo , what to do if i want needle to bang its head with the 120 figure??
    a cg carb nd air intake etc? what sprockets?
    legend will revive soon

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    Quote Originally Posted by hidalgo View Post
    4stroke gurus aadab
    i killed my dad's cd70 planned to rebuild it , i installed cd100's standard piston in it , its bore is 50mm
    bike is all stock except it , it rides great but only clocks 100kmph at speedo , what to do if i want needle to bang its head with the 120 figure??
    a cg carb nd air intake etc? what sprockets?
    fear that speed on this death rider. and enjoy the power ..

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