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Does that matter when buying a sprocket? and I thought the 16t front sprocket didnt fit will because of some spacers it didnt have and made a loud clunking noise when you shift? its a 2008 qingqi 200 what size chain do they come withQuote:
Originally Posted by forchetto
The sprocket has to be the correct one for the size of chain. I guess that you have a 428 chain. To make sure measure the pitch as some bikes did come with 520 chains and matching sprockets. 428 will be 12.5 mm and 520 will be 15.8 mm.Quote:
Originally Posted by AirFramer
Front sprockets are notoriously difficult to source for these bikes.
It sounds easier to just get a 39rear
The 16t front sprocket myself and david3921 mentioned be before will fit, it comes with a spacer that you DO NOT need, we both have this sprocket on our bikes and it bolts right on.
Your bike has a 420 chain and that is what this sprocket is made for.
can anyone tell me about how many RPM their bike is turning at 60mph with the 16t front sprocket and factory rear?
I just noticed the other day i had the bike wide open throttle and was only able to hit 65 and i need 60 to be a cruising speed
With my present 15/44 set of sprockets mine does 60 mph with around 6900 rpm showing on the revcounter. This isn't the most precise instrument in the world though. At this speed you're just 600 rpm short of the maximum torque (7500), so it should hold it OK for cruising.Quote:
Originally Posted by AirFramer
Assuming yours came with 15/48 changing to 16/48 should be about the same.
I have just had a look at that sprocket. I didn't know it was available, thanks Matt. You can go directly to it following this link.
http://sprocketspecialists.com/ProductImages/550-16.gif
Thanks for all the info contained in this thread and indeed the entire site. best resource I've found for these qlinks. I have ordered the 550-16 sprocket along with the popular 125 and 35 jets. Will be doing an exhaust next. I also have a 44 tooth located should I wish to further raise the gearing.
I am going to go with a 16/44 or 45 add the FMF univeral muffler, put a KnN clamp on filter and take off the airbox, remove the SAI and jet the carb
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 :)
Quote:
Originally Posted by AirFramer
that would be the first ive ever seen when more air equal less HP :D lol how far is orlando from jax?
On one of these.... 3-4 hours if not more.
More air isn't the only part of the equation. Especially running atmospheric. You have to manage the airflow both in terms of volume and velocity. Especially on small engines or you won't have shit for torque.
Quote:
Originally Posted by AirFramer
so leaving the airbox on is better? i just remember racing MX i used clamp ons
Removing the airbox and on these CV carbs will kill your power for sure. CV type carbs have to have a certain volume of air flow to work correctly.
Just by an aftermaket racing filter and put it in the stock airbox.
what about a larger carb?
You could put a larger carb or even a different type of carb...there is alot of talk on here about slide carbs.
If you went with a slide carb you could stay the same size as stock and actually gain air flow because of the way they work.
Here is a link about carbs: http://www.mychinamoto.com/forums/showthread.php?t=783
Here is a link about aftermarket air filter: http://www.mychinamoto.com/forums/showthread.php?t=775
The carb from the dr200 maybe ( it's bigger right? ) or a slide carb of appropriate size. Something like that I reckon. For the time being just run a moose or uni replacement filter. That along with jetting and exhaust changes should net a tangible improvement.
Quote:
Originally Posted by AirFramer
yes i dont mind doing this but a 30mm mikuni slide carb is only 39 bucks new on ebay
Then get one ordered! Only one way to find out. Is it one that might be made to fit and sized correctly?
Quote:
Originally Posted by AirFramer
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.
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?
Quote:
Originally Posted by firefightermatt
Forchetto is the expert on the airbox change as he tried it and said it didn't work well.Quote:
Originally Posted by angelr
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.
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.Quote:
Originally Posted by CrazyCarl
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.Quote:
Originally Posted by david3921
Cheers!
ChinaV
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?Quote:
Originally Posted by mickandkat
CC
hi yes with the 428 chain ..
I guess a 51T 520 would be huge! :lol8:
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
so is it right the less teeth on rear the better top end speed?