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Quick question, any particular carb to put on this bike?
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I installed a Mikuni vm26. I have a 30 pilot, and a 120 main with 2 1/2 turns out on the fuel screw at sea level. The carb comes with a 20 pilot, and a 100 main. depending on your elevation you should be ok getting a 25, 27.5, and a 30 pilot, and a115, 117.5, and a 120 main. The Mikuni really helps with keeping the idle consistant, and seems to help with the overall responsiveness.
Carb.
https://www.amazon.com/Mikuni-Carbur...70_&dpSrc=srch
Pilot jet
https://www.rockymountainatvmc.com/p...ries-Pilot-Jet
Main Jet
https://www.rockymountainatvmc.com/p...eries-Main-Jet
I also have a pump carb that has not been installed yet, but another member did, and he is extremely happy with it.
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what's the problem with the gearing, geared to low?
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I bought the bike for mostly trail riding, so it was very important to me that the gears wouldn't be so hight that the engine would struggle going up steeper grade hills. I personally never drove the bike off road with the stock rear sprocket, but just by driving around the neighborhood I could tell it made a world of difference.
The stock rear sprocket is a 530 pitch 38 tooth, and I installed 52 tooth. My gear ratio went from 2.73 to around a 3.73 just from changine the rear sprocket . 1st and 2nd gear pull hard. I want to say the 48 tooth puts around 3.55, and is in line a little better with the chain guide.
Rear Sprocket Details
http://www.chinariders.net/showthread.php?t=20620