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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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    @ hidalgo is at at 14-38 sprockets ? the top speed should not increase only with bigger piston ?

    i enjoy in fear.
    ------------------------------------ALTERATION/MODIFICATION SEPARATE HUMAN FROM BEAST-----------------------------------------

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    Quote Originally Posted by Fahd150 View Post
    @ hidalgo is at at 14-38 sprockets ? the top speed should not increase only with bigger piston ?

    i enjoy in fear.
    m using stock sprocket , i feel bike more jaan daar now , though goes to 100kmph at speedo which is definately faulty
    legend will revive soon

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    Quote Originally Posted by asjdsm View Post
    fear that speed on this death rider. and enjoy the power ..
    i fear sudden stop bro
    legend will revive soon

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    Bro i have unique 70 will this alteration work on it if ichange its cylinder to 110 and head of genion ud 70 will head work with it properly...?
    Attached Images Attached Images  

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    aree yar itna thaka tu sirf ik carb of cg 125 with open filter use karta teri bike 125 sy ziyada bhagti

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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
    same thing was happened to me my father was purchased a CD 70 who,s model was 92 or 93 when i run it hard bike meter needle easily crossed 120km/h in the area of 1.5km.i achieved this speed on that cd 70 many many times my eyes were start flowing water & water doesn,t stop this is my own hand experience.but now a days cd 70 are a piece of crap

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    is the dhoom 110 still with you

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    Quote Originally Posted by saboor73 View Post
    is the dhoom 110 still with you
    yes with him do you want that bike?

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    yes it is still with me .
    as mentioned at some point in above thread i wanted to install even bigger piston and that needed combustion chamber alteration .. so in the process of its alteration it was ruined..

    after that i bored its stocket 78cc cylinder to 100cc cylinder and using qingqi 100 piston.

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    Quote Originally Posted by asjdsm View Post
    yes it is still with me .
    as mentioned at some point in above thread i wanted to install even bigger piston and that needed combustion chamber alteration .. so in the process of its alteration it was ruined..

    after that i bored its stocket 78cc cylinder to 100cc cylinder and using qingqi 100 piston.
    how is the engine runing my cusion have bored his 70 upto 124cc and he told me that the valve of the doesn't last long more than 6 months

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    124 cc seems to be an overkill.. esp if we consider the compression ratio that will be created and also the valves wont withstand the resulting compression pressure and the heat .. so its natural in above particualr case.
    Quote Originally Posted by saboor73 View Post
    how is the engine runing my cusion have bored his 70 upto 124cc and he told me that the valve of the doesn't last long more than 6 months

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    Quote Originally Posted by asjdsm View Post
    124 cc seems to be an overkill.. esp if we consider the compression ratio that will be created and also the valves wont withstand the resulting compression pressure and the heat .. so its natural in above particualr case.
    boring bigger valve could solve the problem he has to live with it

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    Quote Originally Posted by saboor73 View Post
    boring bigger valve could solve the problem he has to live with it
    yes as the matter of fact when a valve hit his seat he transfer his heat to head. bigger valve mean more easily heat transfer ok dear saboor khan

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    i dont think there are any bigger valves for 70cc head .. neither could be the possibility of its installation..

    70's in valve is 22mm and ex is 20mm.

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    Bahi main ny bhi ase he keya howa hy

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