Qingqi QM200GY / Qlink XF200 alternative sprockets

**angelr** · 06-30-2009, 05:22 PM

I have literally thousands of pieces of silicon hoses sitting on my shop shelves. Reducers, straights, elbows, reducing elbows etc. You think anything like that could be used to make the connection? If so I'll gladly send the person willing to try a carb swap what ever pieces can be identified to possibly assist. Tig welder and lots of alloy bits too. I'm sure we can make something work. Anyone more familiar with tuning these tiny engines want to weigh in on the potential value or downfalls of this?

Originally Posted by firefightermatt

You have to remember that the carb we have is 28mm and so are the mounts. If you go with a bigger carb you will have to try to find a bigger rubber mount for the engine side as well as the airbox side.

**david3921** · 07-03-2009, 03:15 AM

Originally Posted by angelr

If only we were just a little closer.... would be nice to have someone nearby with one of these that's enthusiastic about it. Not just stuck with it or trying to unload it on ebay/craigslist. Do a little research on removing the airbox before you go that route if you haven't already. These cv carbs apparently don't like that and won't show the expected gains, and worse still, may show losses. My background is in tuning forced induction cars so I don't know too much but a little reading showed sound reasoning. Resonance tuning and what not. I have a uni filter coming and will look later at possibly sourcing a suitable upgrade for the carb.

higher comp piston, carb, cam..... could be quick :)

Forchetto is the expert on the airbox change as he tried it and said it didn't work well.

Per a question in an earlier post; with my 16/44 combination I am hitting 6000 rpm @ 60 mph. I am learning, however, that my speedo is way off. I put on a bicycle speedo and calibrated it to the wheel size. It is showing a 10 mph difference at 40 and above. The wife and I are going to check the bicycle speedo to our car tomorrow to see if the it is calibrated correctly. But, as forchetto also said the tach is suspect also.

**CrazyCarl** · 07-03-2009, 10:39 AM

Got a gps?

CC

**david3921** · 07-03-2009, 01:23 PM

Originally Posted by CrazyCarl

Got a gps?

CC

No, I wish but I don't have a use for it beyond this. We're just going to run side by side at different speeds to compair. I can adjust the speedo from this to get as close to reality so I can get a true MPG reading. I think the main problem is that, as you stated in another post, that the same speedo is used on a number of bikes. If my XF200 and the XP200 use the same speedo, and I'm pretty sure they do, then one of the models will be off as I can't see that Qingqi would go through the trouble of calibrating the speedo to each model.

**ChinaV** · 07-06-2009, 08:23 AM

Originally Posted by david3921

No, I wish but I don't have a use for it beyond this. We're just going to run side by side at different speeds to compair. I can adjust the speedo from this to get as close to reality so I can get a true MPG reading. I think the main problem is that, as you stated in another post, that the same speedo is used on a number of bikes. If my XF200 and the XP200 use the same speedo, and I'm pretty sure they do, then one of the models will be off as I can't see that Qingqi would go through the trouble of calibrating the speedo to each model.

The speedo drive unit that goes between the front wheel and axle is different between the motard and dual-sport models. I asked about this at the QingQi factory when we discussed 21" vs 17" front wheels.

Cheers!
ChinaV

**mickandkat** · 01-06-2010, 06:16 PM

hi i checked mine today but has a 51 tooth rear and 15 front is this a good setup has anyone tryed i cant ride bike till march im doing it up ready for my licence

**CrazyCarl** · 01-06-2010, 08:17 PM

Originally Posted by mickandkat

hi i checked mine today but has a 51 tooth rear and 15 front is this a good setup has anyone tryed i cant ride bike till march im doing it up ready for my licence

That a 428 chain?

CC

**mickandkat** · 01-07-2010, 09:12 AM

hi yes with the 428 chain ..

**CrazyCarl** · 01-07-2010, 04:07 PM

I guess a 51T 520 would be huge!

Anywho, dropping to 47 or so may improve your top speed a bit and give you longer legs. IIRC, there's not much room to enlarge the front sprocket so dropping the rear is not a bad idea. ChinaV and a couple others have played around with the gearing ratios on the QingQi's a good bit... and I think there are already some threads on MCM about that very topic if you dig around.

CC

**mickandkat** · 01-09-2010, 06:18 PM

so is it right the less teeth on rear the better top end speed?

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