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  1. #1 Qingqi QM200GY / Qlink XF200 alternative sprockets 
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    My bike comes with 134 links of 428 chain and sprockets 15 / 48 tooth.

    These bikes can benefit from a raised overall gear ratio to lower rpm's at reasonable highway cruising speeds, 44 tooth for the rear sprocket seems to be a preferred size to achieve this.

    If we could get a larger 16 tooth engine sprocket it would be about the same gear ratio change and would reduce the amount of chain wear. The smaller the front sprocket the greater the wear rate. In transmission engineering circles it's reckoned that if your application requires a long life, conventional wisdom says don't use a small sprocket with less than 18 teeth. However, I have seen karts with 10 or even 9 teeth on the small sprocket. Most of these guys have to put new sprockets on every race...

    We can't get these 16 tooth sprockets easily, and the housing design won't allow for a greater size to be fitted, so it's the rear sprocket for us:

    Here are some alternative sprockets from a Suzuki TS125ER that will fit. The part numbers given are the original (OEM) Suzuki numbers, so we can walk in a Suzuki dealership and ask for the correct item without suffering the shame and embarrasment of saying we have a Chinese bike

    64511-48730----428 chain----42 teeth
    64511-48700----428 chain----44 teeth
    64511-48720----428 chain----45 teeth

    If you have a spare half hour, this is a wonderful site dealing with bike transmission issues:
    http://faq.f650.com/FAQs/SprocketsOtherSizesFAQ.htm

    In fact the whole site, dealing mainly with BMW's F650 is a powerhouse of knowledge and wisdom. Very extensive though.
    http://faq.f650.com/main.html
    Last edited by forchetto; 08-23-2008 at 11:03 AM.
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    Qingqi QM200GY-BA Super Motard
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  2. #2  
    Administrator-tron CrazyCarl's Avatar
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    That's extremely useful info. I'm wondering how many people have the QingQi's with 428 chains? I know they make 520 sprockets and chain sets for the bike. Would be nice if someone could import these parts... Hmmm....

    CC
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  3. #3  
    Senior C-Moto Guru bigdamo's Avatar
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    Quote Originally Posted by CrazyCarl View Post
    That's extremely useful info. I'm wondering how many people have the QingQi's with 428 chains? I know they make 520 sprockets and chain sets for the bike. Would be nice if someone could import these parts... Hmmm....

    CC
    A 520 chain might rob the already low power Qingqi of some speed and power especially a 520 o-ring chain.
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  4. #4  
    Life Is Good! ChinaV's Avatar
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    Is there any reason you guys are staying with the 428 chain & sprockets? I guess there might be a slight weight advantage, but the 520 will last much longer and require less adjustment.

    If you change to 520, you can easily find sprockets from lots of aftermarket suppliers. JT has a good offering and their sprockets can be found just about anywhere.

    JT Front sprocket available in: 11, 12, 13, 14, 15 teeth
    JT Rear sprocket available in: 39, 45, 46, 48 teeth

    All these models use the same countershaft sprocket:
    SUZUKI 200 DR200 86-88 3.00 520-112
    SUZUKI 200 DR200SE 96-08 3.00 520-112
    SUZUKI 200 SP200 86-88 3.00 520-110
    SUZUKI 250 DR250 90-93 3.77 520-110
    SUZUKI 250 DR250S 90-92 3.77 520-112
    SUZUKI 250 DR250SE 93-95 3.00 520-108
    SUZUKI 250 DR-Z250 01-07 3.77 520-112
    SUZUKI 250 LT250R - Quadracer 85-92 3.50 520-102
    SUZUKI 250 LT250S 89-90 3.25 520-86
    SUZUKI 250 RM250 1982 3.50 520-114
    SUZUKI 250 RM250 1983 3.57 520-116
    SUZUKI 250 RM250 84-86 3.57 520-116
    SUZUKI 250 RM250 1987 3.57 520-114
    SUZUKI 250 RM250 1988 3.85 520-116
    SUZUKI 250 RM250 89-96 3.77 520-114
    SUZUKI 250 RM250 97-98 3.85 520-114
    SUZUKI 250 RM250 99-00 3.69 520-114
    SUZUKI 250 RM250 01-03 3.77 520-114
    SUZUKI 250 RM250 04-08 3.85 520-114
    SUZUKI 250 RMX250 89-98 3.85 520-114
    SUZUKI 350 DR350 90-93 3.36 520-110
    SUZUKI 350 DR350 94-99 2.93 520-110
    SUZUKI 350 DR350S 90-93 3.07 520-108
    SUZUKI 350 DR350SE 94-95 2.73 520-110
    SUZUKI 350 DR350SE 96-99 2.73 520-108
    SUZUKI 400 DR-Z400 00-03 3.36 520-112
    SUZUKI 400 DR-Z400E 00-07 3.36 520-112
    SUZUKI 400 DR-Z400S 00-08 2.93 520-112
    SUZUKI 400 DR-Z400SM 05-08 2.73 520-110

    All these models use the same rear sprocket:
    SUZUKI 125 TC125 71-77 3.03 520-92
    SUZUKI 185 DS185 78-80 3.25 520-102
    SUZUKI 185 TC185 74-77 3.25 520-94
    SUZUKI 185 TS185 71-81 3.25 520-102
    SUZUKI 200 DR200 86-88 3.00 520-112
    SUZUKI 200 DR200SE 96-08 3.00 520-112
    SUZUKI 200 SP200 86-88 3.00 520-110

    I'm running 13 Tooth Front with a 37 tooth Rear, good all around gearing for a dual sport. I had a 14 tooth front before, it's not ideal for this small engine.

    Cheers!
    ChinaV
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  5. #5 Alternative sprockets 
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    Awesome post. Thanks ChinaV!!!. I'm only considering the 428 size because it's what everybody keeps talking about. I thought it was strange that the Qingqi QM200GY could not use the 520 like its sister the DR200.
    I imagine Qingqi fitted the 428 set to save money or something.
    With your info it's even possible to buy the complete chain/sprocket set from Suzuki or even from other aftermarket suppliers and that works out cheaper than buying the bits separately.
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  6. #6  
    Senior C-Moto Guru bigdamo's Avatar
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    A 520 chain won't necessarily last any longer than a 420/428 chain unless you have a very high powered motorcycle.

    I run a 428 chain on my trials bike you can get a 520 trials dedicated chain also.
    I ride in the worst conditions (mud water dust)

    It is the qaulity of the chain and sprockets that decides how long it will last and you have to change the sprockets and chain at the same time.
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  7. #7  
    Life Is Good! ChinaV's Avatar
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    Quote Originally Posted by bigdamo View Post
    It is the qaulity of the chain and sprockets that decides how long it will last and you have to change the sprockets and chain at the same time.
    I agree that quality drive components will outlast the cheap stuff regardless of size, but a 520 should outlast a 428 if they are the exact same grade of chain on the same motorcycle. The 520 has more material and surface area, it should wear a bit less. Some factors to consider in the 520 / 428 debate.

    Weight: The 428 drive set should transfer horsepower better than the 520 because it's a bit lighter. However, high end 520 components such as aluminum sprockets with 520 racing chain, will be lighter and roll with less resistance than a heavy duty 428 chain on steel sprockets.

    Price and availability: I think it's going to be easier for people to find certain combinations of drive components in 520 vs 428, but that will depend on what country you live in and the depth of aftermarket support.

    Forchetto, you mentioned f650.com (a sight I frequent because I have a F650 Funduro) their chain FAQ is great, http://faq.f650.com/FAQs/GeneralChainFAQ.htm along with the sprocket page you pointed out. We need to follow their example and report on what drive component combinations are best for our beloved QM/XF200.

    We should try to figure out the speed/RPM variations of the different gear ratios and how they relate to the different wheel sizes of the motard and dualsport models.

    For instance, I have the dualsport:

    Setup #1 (Stock) 520 Chain 12T Front 36T Rear (Ratio 3.00)
    Good for the dirt or 2 up riding, bad for long hauls on extended pavement.

    Setup#2 520 Chain 14T Front 36T Rear (Ratio 2.57)
    Good for extended highway use, bad for off road riding or heavy loads.
    Top speed (by GPS) 114.25 KPH.

    Setup#3 520 Chain 13T Front 37T Rear (Ratio 2.85)
    Good all around combination. Helps with vibration at cruising speeds of 70-90 KPH, still has good performance in low gears when you go off road.
    Top speed (by GPS) 111.40 KPH.

    This spreadsheet http://www.dropbears.com/u/utilities...earing_V12.zip would help if we could find the gear ratios for the transmission. Are these is the service manual for the DR200?

    Anyone?

    Cheers!
    ChinaV
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  8. #8 Gear ratios Suzuki DR200SE 
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    The manual I've got covers models from 1997-2007.

    The primary reduction and gear ratios have remained the same all those years, but the final reduction has changed slightly.

    Here they are:

    Primary reduction... 3.157
    1st gear............... 3.000
    2nd..................... 1.933
    3rd...................... 1.437
    4th...................... 1.095
    5th...................... 0.913

    The final reduction ratios are quoted as:

    Years 1997 to 2003 and 2007 as 3.000 (15/45)
    For 2004, 2005 and 2006 it was 3.916 (12/47)

    I assume the figures in brackets are the sprocket sizes?.

    Would be nice to be able to fit DR200 sprockets, but I seem to remember someone here (volksjagger?) saying something about how the countershaft on the Qingqi was too short to accomodate 520 sprockets. I can't see the Chinese making a special countershaft, just so they can fit a 428 chain set...
    Last edited by forchetto; 08-28-2008 at 06:16 PM.
    Jincheng Monkey JC50Q-7
    Skyteam Dax replica ST110-6
    Zongshen ZS125-43
    Qingqi QM200GY-BA Super Motard
    Qingqi QM110GY
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  9. #9  
    C-Moto Not-so-Noob
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    I just got one of these bikes, my commute to work is top speed of 60mph, and i notice the bike has to be ran pretty hard to achieve this. I weigh about 160lbs and was wanting to know if going to the 42tooth rear would make it easier for the engine to sustain this speed.
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  10. #10  
    C-Moto Not-so-Noob
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    Also what about exhaust... does the dr 200es exhaust fit, they look very similar
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