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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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    yar due to sum bzy shedule hvnt took any pictures but INSALLAH ill take
    My Vehicle is an ALL MOTOR. Seriously, Who needs a turbo when u have a Stupidly Quick Naturally Aspirated Motor???? Real Motors don't need Forced Induction. EG for life

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    My Vehicle is an ALL MOTOR. Seriously, Who needs a turbo when u have a Stupidly Quick Naturally Aspirated Motor???? Real Motors don't need Forced Induction. EG for life

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    a little update,,
    after few tests in city riuding with double sawari and mostly riding at 60km/hr + speeds and in very congested traffic and some bursts of 80 km/hr plus i found its milweage to be 50km/litre,, which is reasonable,,
    its now much smoother and sof running bike,,
    though the sprockets needs a bit of good combination as 15-41 is too agressive and harsh in asmall gears,,but pick is awesome,,


    question/suggestion is needed

    i want to upgrade its silencer,,i have seen a qingqi 100 motorcycle silencer it exactly like honda cg125 silencer it ha bigger pipe and exhaust ,,realy liked it,,i think it will be much better if i install that on my bike,, for refrense here i m posting its pic,,a shopkeeper told me it costs 600 rs and is in same fiting as of 70,,so it will be bbolt on fit,,
    i beed ur advise

    Project Dhoom YD 70 Upgrade to 110cc -313993

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    @asjdm
    yar sab say pehly to apna name to btaoo

    I hv already said kay silencer walay kay pass jaao aur us ko bolo is silencer ka sound bana do... means yar silencer kay end mein jo hole hota hai basically woh chota sa pipe hota hai ap us pipe ko nikalwa kar thora mota pipe weld kaarwa do bas... sound bhi thora acha ho jaay ga aur bike bhi khul kar chalay gi a brotherly advice to u my bro... Qinqi ka silencer sab say pehly bht hi ganda look day ga 70 par aur phr sound oo yuk
    My Vehicle is an ALL MOTOR. Seriously, Who needs a turbo when u have a Stupidly Quick Naturally Aspirated Motor???? Real Motors don't need Forced Induction. EG for life

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    my name is Ahsan Ullah
    sorry for odd pw name,,
    anyhow,, i will ask silencer walas when i get opportunity,, but the qingqi looked really nice with this silencer,,its pretty cheap as well i think i will give it a shot before playing with default one,,and i also do not want my bike to be loud.. i want it sombre .. not very loud..either on idle or throttled.. kia mota pipe weld karana sa sound bahoth unchi tho nahi ho jathi ?
    and wo mota pipe kaha sa/kis cheze sa milay gaa.
    and can u mention the cost ?

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    ^^
    nice name bro!

    thora sa farq aaay jo stock silencer ki awaz hai us mein thora bhari pan ajaay ga bas lkn not disturbing sound it will create yar yahn to 200rs mein silencer wala bana deta hai... silencer walay kay pass hi pipes hotay hain woh default pipe nikal kar dosra pipe laga day thora motay dia wala bas
    My Vehicle is an ALL MOTOR. Seriously, Who needs a turbo when u have a Stupidly Quick Naturally Aspirated Motor???? Real Motors don't need Forced Induction. EG for life

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    yar aj kafi market phra houn ,, sab mechanics na kahga hay ka silencer change karna sa koi farq nahi hoga,,and they also said ka picha surakh karna sa bhi koi farq nahi paray ha,,he used some other word for the holes,, surmay.or surmia,, dont remember but was like these words,,

    i really liked the qingqi silencer,, it was awesome style and quality wise,,

    one shopkeeper said it fits on chondas,, other says no,,
    please experts tell me if i wil get any preformance by upgrading,

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    today i installed qingqi 100 silencer,,
    soun wise it sounds exactly like qingqi rickshaw ,, love it,,
    performance wise i havent tested yet,,but one thing i noted is that it runs even more smoother,,due to free flow of gases,, the silencer is like of 125 shapewise,
    price was 1000 rs and 60 rs for installation,,
    installation was a bit tricky as the plate to which it attaches had different pattern of holes,, new hole was cut in the plate,and the bolts at head were a bit tight,,a fu^^^^^ mechanic used hammer on nuts to widen the gap between them,,
    any how now its perfect fit,, will make a video and images tommorrow,,

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    zaberdast sir g
    now thats ultimate modification and a diy
    u learnt u asked y tried i liki like it
    legend will revive soon

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    Kesi chal rhi hy Altered Bike?
    What about Pick,Top speed & Mileage?
    I Am the Feel
    I Am The Yamaha!

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    yamaha yb100 r cg125 is gud bikes stock

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    Quote Originally Posted by asjdsm View Post
    today i installed qingqi 100 silencer,,
    soun wise it sounds exactly like qingqi rickshaw ,, love it,,
    performance wise i havent tested yet,,but one thing i noted is that it runs even more smoother,,due to free flow of gases,, the silencer is like of 125 shapewise,
    price was 1000 rs and 60 rs for installation,,
    installation was a bit tricky as the plate to which it attaches had different pattern of holes,, new hole was cut in the plate,and the bolts at head were a bit tight,,a fu^^^^^ mechanic used hammer on nuts to widen the gap between them,,
    any how now its perfect fit,, will make a video and images tommorrow,,
    tomorrow kab aye g
    legend will revive soon

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    Quote Originally Posted by asad_racer120 View Post
    yamaha yb100 r cg125 is gud bikes stock
    No doubt Yb100 is king in its class.
    I know this very well.
    I Am the Feel
    I Am The Yamaha!

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    dear apne itni khwari ki mere pas crown lifan 70ccc bike thi mene sirf piston change kia tha cd100 ka dala ooper se thora cut karna para piston ko baki har cheez original thi carb sylincer ets bike 110 easily marti thi 125 ko bhi kareeb nhi ane deti thi
    ikd

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    @imran any pics of that bike?
    legend will revive soon

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    yar mobile chori ho gia ha,, pic / video ka koi tareeqa nahi ab mera paas,,

    so far its running good,,,
    murre road pa bahot jaldi teesra gear ma hi 80 ki speed achieve kar jathi ha,, chotha gear ki nobaath nahi parthi,,

    top speed so far noted by me is 100, fully loaded double sawari,, sitting like sofa set,,

    consumption in city ride is 46-50,, and more or less 50 on long ride to murree with double sawari,, but pick is awesome,,,

    sound is a ditto of qingqi rickhaw,,

    have done almost 3000 km on this engine,, still running great,,
    however muja itni umeed nahi thi,, cause cylinder used ma lia tha and uss ma aik ghara tha jo bhoth bara tha,, i was thinking of it smoking from day 1 but it never smoked,,and still no smoke,, inshallah whe i get time i will bore it to sd110 piston as the rings of that piston are very thin so there will be less resistance on piston,, as the surface contact area of rings is reduced also that will give a true 111cc capacity,, currently it is 104cc,,
    and current compression ratio is 9.5+ to 1.. which is high,, with sd110 piston which has pockets for valves that ratio will fall to something below 9.5 ,,

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    now we are talking
    i wanna buy a chonda now
    legend will revive soon

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    Yaar main bhi apni Cd 70 ka make over kar raha houn. Inshahallah aik separate thread bana kar before aur after comparision karoun ga.

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    ^^ bhai cd 70 ka stroke bahoth chota ha,, us ma ziada alteration karni paray gi,, and iada karcha ho ga,,

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    Nice work bro Ride safely

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