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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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    Quote Originally Posted by asjdsm View Post
    nahi lota nahi mila..*
    and also 125 spare carb is lying with me and another cd 100 carb.. i searched all 3 and 5s shops in committe chowk and circular road in pindi and peshawar mroe in islamabad and no one have this lota. they didnt even knew that its changed... only after teling them they checked a bike and then they goot some book and looked at numbers and said ya its changed and will order it.. some said ya kabi bhi market ma nai aya ga. kiona 5 sal pahla jo chez market ma honda lai thi us ka parts abi tak nai mill raha.. he was refereing to cd100 parts..*
    Let me check if its available here..
    Dream is not that which you see while sleeping it is something that does not let you sleep.

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    Quote Originally Posted by asjdsm View Post
    if someone wants to use 110cc cylinder buy united 100 cylinder .. thats 107cc aka 110cc.. and costs 800-1k brand new..
    and may be bore out the cylinder for sprinter 110cc piston as that piston has tthin rings wich will give good pick and speed.. but that depends on the condition of cylinder.
    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?

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    bolt on fit on chonda
    legend will revive soon

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    Quote Originally Posted by hidalgo View Post
    bolt on fit on chonda
    Ok thanks. Agar honda per fit ho raha ha bolt to bolt to road prince per be hoo gai ga or atleast i hope so. Lets see kya bunta ha

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    bhai honda nahi chonda .local 70cc par bolt on fit.cd70 has relatively smal con rod.it need more changes
    legend will revive soon

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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?
    ... try reading my posts at other thread as well... and i will use csuzuki piston not suzuki .. lol.. chinse piston for suzuki sprinter 110cc.. thats ditto copy ...and dirt cheap..

    and jo 72cc hain un ma alteration ka itna marjin nahi ha.. jabka 78 cc bikes ma bhoth marjin hotha h..

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    Quote Originally Posted by IceCold View Post
    Brother can u please tell me from where you bought this 4 wheeler cylinder of 107 capacity and the cylinder head and how much did it cost?
    I read this thread yesterdays and was really impressed with what you have done with your dhoom 70cc. I have a road prince 70cc 2012 model. I am interested in trying something similar with my road price......can you help and any tips?
    u will find a block greater than 97.1cc from no where in pindi . i searched whole day for a 110cc

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    here is a used block of 97.1cc available at 400rs( if any body wants it). near railway hospital at a chingi workshop

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    Quote Originally Posted by asjdsm View Post
    ... try reading my posts at other thread as well... and i will use csuzuki piston not suzuki .. lol.. chinse piston for suzuki sprinter 110cc.. thats ditto copy ...and dirt cheap..

    and jo 72cc hain un ma alteration ka itna marjin nahi ha.. jabka 78 cc bikes ma bhoth marjin hotha h..
    App link da sakta hain apni dorsi threads ka. I will try reading those.

    Road prince 72cc ha, phir is main risk lia ja sakta ha upgradition ka??

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    Quote Originally Posted by Fahd150 View Post
    u will find a block greater than 97.1cc from no where in pindi . i searched whole day for a 110cc
    I live in Lahore. And also if i make up my mind, i will try to find a brand new united 100 or road prince 110 cc block cylinder etc. But like asjdsm is saying kah 72cc main upgrade ka margin bohat kam hota ha or road prince 72cc ha, now i am confused.

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    Quote Originally Posted by Fahd150 View Post
    u will find a block greater than 97.1cc from no where in pindi . i searched whole day for a 110cc
    you tryed auto race ???????????????
    legend will revive soon

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    Quote Originally Posted by IceCold View Post
    App link da sakta hain apni dorsi threads ka. I will try reading those.

    Road prince 72cc ha, phir is main risk lia ja sakta ha upgradition ka??
    i was talking of the MR 70 Alteration thread running here..that also has same discussion going ..

    i wont recomend doing anything to 72cc bikes.. *as they have toched the limits... bore and stroke ratio is very important . too much skewed value of this ratio is not good.. with stock chonda the bore is already way to much compared to stroke .. *so if u increase the bore u wont gain much in my opinion... increasing stroke would mean a lot of changes . and may be still those changes wont be bolt on fit.. u would still need to do alteration inside engine for the bigger parts to fix..

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    Quote Originally Posted by Fahd150 View Post
    u will find a block greater than 97.1cc from no where in pindi . i searched whole day for a 110cc
    have u seen the united 100 block ? i have heard from handfull of mechanics that its also 110.. so u should just get a ruler and measure its bore size .. if its above 50 (52.4mm exactly ) then its 110cc .. dont go on labling .. chinese under invoice or under label things to avoid being taxed...

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    @cold ice
    i think
    72cc main stroke & crank shaft b bara dalna paray ga it will support more kind of blocks and heads

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    @hidalgo
    i went to every shop at murreroad ,went to chinqi shops but cant.

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    i have bolt the head with my dirty hands . it was a real agony, "but done atlast without ustad".
    understood 4 cycles inside.
    played a little with exhaust valve timing to open&shut.

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    Quote Originally Posted by Fahd150 View Post
    @cold ice
    i think
    72cc main stroke & crank shaft b bara dalna paray ga it will support more kind of blocks and heads
    crankshaft..*
    con rod...
    cylinder mounting studs..
    due to bigger crankshaft the case inside may need boring..

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    Quote Originally Posted by Fahd150 View Post
    @hidalgo

    i went to every shop at murreroad ,went to chinqi shops but cant.
    bro i am using 4 wheeler cylinder labelled 107cc but mathematical calculations put it at 104cc.. at least thats what i remember now..
    now the piston was from 4wheeler zero number same was cylinder .. though it was a good candidate for boring...
    but i used new rings and the rings of united 100 were used. and the piston was above 50mm.. look above to confirm exact values..*
    so it is confirmed that the united 100cc cylinder is the 110cc classs cylinder.. just go to committe chowk and jo mohammadi ka sath wala plaza ha us ma aik shop ha wo united ka saman raktha ha.. ask him for united 100 cylinder and check whats labelled on that and use ruler to measure the bore if its above 50 then its confirm 110cc and i am sure it is..
    and it will be dirt cheap compared to what u will find in used condition..

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    when u say u wnt to every shop what u asked for ? most of those who sale dont know what it is.. all they know is its cylinder... *they dont konw anything of bore and stroke.. ask few mechanics what is the stroke of 70cc.. and 78cc.. most will say 4 stroke.. LOLzzzzz

    do check united 100 cylinder ..and re read all me posts in this type of thread for its compatibility with ur bike..

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    Ok thank you asjdsm and Fahd150 for your very important feed back. Mugha lagta ha road price ko bachna he para ga.

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