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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
    ---------------------------------------------


  2. #61
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    its just like engine swap but transmission has not been changed
    qingqi has longer gear ratios????
    y not any big 100 cc chondas transmission??

    n do upgrade clutch box as well
    legend will revive soon

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    Angry bought the qingqi parts but its pathetic quality items,,

    hi
    today i bought the clutch box,and clutch gears,, but its the worst quality items,, they were sealed in packings and it was impossible to see what's inside until one removes its seals,,after coming home just now i opened it and found the following poor quality items,, note these are from plum qingqi,, original parts,, they cost 1500 rs in all,, but the after parts of other vendors cost 100-1200 ,,
    i will discuss with mechanic(ustaad shabir khadda market) ,, if its not ok product i will be .. well lets be polite here,,,

    they all looks like very poor quality forging,,,
    its a live example of chonda. Chinese bikes quality control at its peak,,

    look for the defects,,
    Project Dhoom YD 70 Upgrade to 110cc -300929

    Project Dhoom YD 70 Upgrade to 110cc -300930


    just look at this pic ,, how much defects there,,
    Project Dhoom YD 70 Upgrade to 110cc -300931

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    Bera gharak QINQI ka.
    ALLAH karay mechanic is ko pass kr day nhn to 1.5k
    I Am the Feel
    I Am The Yamaha!

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    haha

    thanks .. mechanic passed it...installed it.. labor was 250 ... and also changed the oil.. it was havoline cost 250.. 500 rs in alll.. now its much smooth..and attaining a speed of 80 is pretty easy and smooth.. riding at 80 feels like riding it at 50-60 .. so smooth.. tried to push it to the limit but couldnt get much then 90km/hr top speed..

    so i think its now much better...

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    great
    enjoy it ahsen bhai
    legend will revive soon

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    ...and my bike is still in running.. but i am beating the hell out of it.. had a tour to damnekoh with triple sawari.. dont know when the running finshes how it will respond.. i have done 700 km on its new pistn cylinder,, and 20 km on the new clutch set,,

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    man u dont know how much m enjoying my bike now a days
    legend will revive soon

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    90 km\h only? Ap ny is sy pehlay ek dafa 100km\h bhi btai thi.
    Wese ek baat QINQI ki khud bhi itni hi speed hy.
    I Am the Feel
    I Am The Yamaha!

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    itni speed achieve karna ka mouqa milla tha ... iss sa aga bhi shayad jaya but.. 80 tak aram sa jathi ha .. just like achieveing 60 km/hr on normal 70.. but 80 sa aga mar mar ka speed achieve karthi ha..

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    and by the way its in running.. break in period.. let the new rings set...

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    bhai running aisay to ni krtey like youu are doing with triple sawari
    its ruining
    legend will revive soon

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    I think yaar agar aap nay top speed increase karni hai then running process mein bike pe thora load daalo. As you mentioned that aap nay 700km running ki hai then ais k motabiq aap thora zada load karo bike pe. Matlab long drive pe bike top say top speed pe lay janay ki khosis karo. Top speed jo bhi achieve ho aos pe bike 5 seconds to 10 second rakh kar speed low kar lo. and do this practice frequently

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    Unhappy

    Quote Originally Posted by hidalgo View Post
    bhai running aisay to ni krtey like youu are doing with triple sawari
    its ruining
    frankly mujha yaad hi nahi tha,, a friend of mine reminded me,,

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    Ais tarhan plates mein adjustment thek ho jaye ge. Thora gap jo chahiye especially teeth mein jo gap ho ga woh aos ki fitting k liye chahiye. ais process say gap thora zada ho ga. But after running process, your top speed will be increased aur agar small race ho ge then no body can bring his bike near yours. I assure you

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    ahsen bhai speedo bhi slow hu sakta ha na?
    acl ka ha ya alsons ka????
    mere cd70 ka slow hacl ha
    legend will revive soon

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    alsons,,,,

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    kisi aur bike k sath jor k daikho na ksi gari k sath most recomended
    legend will revive soon

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    Cool

    Quote Originally Posted by hidalgo View Post
    ahsen bhai speedo bhi slow hu sakta ha na?
    acl ka ha ya alsons ka????
    mere cd70 ka slow hacl ha
    O really. . . . .
    Han slow hy phr bhi 85 km\h jata hy.Strange na? U mean to say ye 85 km\h nhn 100 km\h hy?
    I Am the Feel
    I Am The Yamaha!

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    Quote Originally Posted by N0m1 View Post
    90 km\h only? Ap ny is sy pehlay ek dafa 100km\h bhi btai thi.
    Wese ek baat QINQI ki khud bhi itni hi speed hy.
    Its not about the top speed.
    Its about how fast you achieve that speed.
    One of the most difficult things in the world is to know how to do something, and to watch without comment, somebody else do it incorrectly.

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    ^^ yes,,, that's what i m noting is improving ,, now it reaches 80 in third gear so easily and even then its so soft smooth and powerful,, fourth gear reduces its rpms but makes it more soft,, and note that i checked the top speed on a patch of hardly .5 km,,then there would b trafic r jump,,or some other obstacle,,

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