Upgrading front sprocket? KPR 200
 

Im thinking about putting a 17 tooth sprocket into the front of my kpr 200 with the stock rear. Is the 428 chain ok for these bikes with that ratio? Has anyone tried this? I notice the 15 t front that comes with it has a metal edge to the inner part of the sprocket that the others I got did not. Will that cause any wobble with the chain?

1) Yes, the 428 chain is fine with the amount of hp that the KPR puts out. I would advise a good quality Japanese 428 chain, if you want to upgrade it.

2) Yes, I tried the 17t sprocket and I didn't care for it because the bike just doesn't have enough hp to push it with that high of gearing. Although Jim a member on here is running a 17t I believe and likes it. I have a 16t on mine.

3)No, the replacement sprocket won't cause a wobble because it's thinner than the original sprocket, if anything it may make a tiny bit more vibration into the foot pegs, but I haven't really noticed it.

Herbie's right - I'm running a 17 tooth and like it. Most of my daily commute is highway miles and it does great and is averaging just over 102mpg.

Two great answers. Thank you guys both. Exactly what I was looking for.

Thank you for posting this here I've found it helpful in my research of things to do whilst upgrading.