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  1. #31 Re: TDC at compression stroke 
    C-Moto Not-so-Noob
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    wow! this is really very informative. thanks sir for this post.
    but i have a question. what is the valve clearance for a 200cc engine? is all 200cc engine have the same valve clearance? if so i can do my own DIY on my valve clearance for the first time
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  2. #32 Re: TDC at compression stroke 
    C-Moto Senior Nima Naderi's Avatar
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    it depends on valve system -pushrod or chain drive - so refer to service manual if available , if not find the most similar engine that has the proper service manual

    at last take the exhaust a little more lose compare to inlet on pushrod like GS engine like honda cg and same values for GY engine like QM200.
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  3. #33 Re: TDC at compression stroke 
    C-Moto Not-so-Noob Basri's Avatar
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    Today checked the valve clearences, my bike is one of the Turkish version of QM200GY, 2006 Pioneer Takashi with 6300 kms on the clock.

    I measured the inlet was 0.10 mm as well as the exhaust was 0.10 mm too, lucky me... I belive these are the factory settings..

    Left them alone and closed the lids...Will check again after 5000 kms..

    My personal opinion is; 0.10 mm clearence for both inlet and exhaust valves is the best value for these bikes, because, my bike starts at a second even in cold mornings, no valve noice at normal operation temperatures, very little valve noice only when engine is extremely hot.., Bike pulls like a train, incredible powerfull for a 200cc bike even on high gears at low speeds, don't have to lower the gear, just pull the gas and she speeds up..
    Last edited by Basri; 10-22-2011 at 05:37 PM.
    Yes, Basri is my name and avatar is real me...
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  4. #34 Re: QingQi (Qlink) 200GY Illustrated Valve Adjustment 
    C-Moto Not-so-Noob
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    Quote Originally Posted by volksjagger View Post
    well i wanted to update on my comment "it needed it so bad (valve adjustment) it was cutting out at top speeds. the carburetor was not the cause."

    it turns out i had a vacuum problem in the gas tank!!!

    although the bike did like the valve adjustment the stuttering gradually came back.

    after 2 trips to the dealer and about 5 test rides the second time it just needed a vacuum line swapped.

    i went down on my jetting since i went so big on it, all the way to 135. and it amplified the problem. that is when they dug a little deeper and determined it was the vacuum line.

    just wanted to clear this comment up. now it is running like a top again!!!

    Do you have a picture showing such vaccum line needed to be replaced? I'm have the same issue. I decided to break the rubber seal on the gas cap for a temporary fix which isn't good in the long run because it allows water, moisture, dirt, ect to get into the gas tank.
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  5. #35 Re: QingQi (Qlink) 200GY Illustrated Valve Adjustment 
    C-Moto Not-so-Noob
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    Good evening everyone. last sunday i changed my oil and checked the valve as well. this time i tried the .10mm in and .10mm ex. and it feels really better on my bike.
    before i was using .08mm in and .10mm ex. it runs good but the engine comes too hot and it runs no well after a long ride, i mean im not satisfied with the topspeed.
    now the new valve clearance will be tested tomorrow if it will be really better from the old clearance after my long ride.
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  6. #36 Re: QingQi (Qlink) 200GY Illustrated Valve Adjustment 
    Senior C-Moto Guru Zorge's Avatar
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    Try 0,15 mm for exaust valve.
    Ask me nothing - I DO NOT speak english. Really...
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  7. #37 Re: QingQi (Qlink) 200GY Illustrated Valve Adjustment 
    C-Moto Not-so-Noob
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    whats up guys? wheeew long ride is done. im so happy and contented today with the acceleration and less vibration of the engine and also less noise. but im disappointed with my top speed. i feel like my bike is tired even from the first few kilometers. hmmm dont really know whats the best valve clearance for my bike. the manual says 0.02-0.05 mm only but thats too close for me and the engines comes to hot
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  8. #38 Re: QingQi (Qlink) 200GY Illustrated Valve Adjustment 
    Senior C-Moto Guru Zorge's Avatar
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    With the clearance you mentioned, you will burn valves.
    Ask me nothing - I DO NOT speak english. Really...
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  9. #39 Re: QingQi (Qlink) 200GY Illustrated Valve Adjustment 
    C-Moto Not-so-Noob
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    Quote Originally Posted by Zorge View Post
    With the clearance you mentioned, you will burn valves.
    yes sir youre right. thats why since sir chinaV posted this thread and i had read it, i did my DIY valve clearance job. first i used the 0.06mm in and 0.08mm combination and it did gets good, then 0.08mm in and 0.10mm ex and it did gets better and now im searching for the best. my current 0.10mm in and 0.10mm ex is good but not really good. so now sir zorge you think is it good if i try the 0.15mm ex while still my in is 0.10mm?
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  10. #40 Re: QingQi (Qlink) 200GY Illustrated Valve Adjustment 
    Senior C-Moto Guru Zorge's Avatar
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    Please, do not "sir" me - I feel so uncomfortably. In this forum we are all equal - C-moto army's combatants.

    A propos valve clearances: not so long ago, in our local moto forum, once again was discussed about the issue. Again, the practice proved that 0.1 on intake and 0.15 on exhaust is the winning combination.
    Ask me nothing - I DO NOT speak english. Really...
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