idle jumps rpm's without throttle

bucannon · 02-17-2014, 06:55 PM

okay so after a rebuild i put my Mikuni 30mm carb back on my 200cc bike with about 900 kilometers on the clock. it runs and idles but not perfectly...

any help would be appreciated!

here are the issues:

1. I can only start it with the choke closed even when it is warm.

2. ocassional backfire (and i did adjust the valves once)

3. it will start and idle around 1500 rpm. with my hand off the trhottle the whole time it will go up to 4000 rpm until it backfires then will slow down, over and over.

02-17-2014, 06:55 PM	#1
bucannon Join Date: Nov 2011 Location: Galveston, TX Posts: 63	idle jumps rpm's without throttle okay so after a rebuild i put my Mikuni 30mm carb back on my 200cc bike with about 900 kilometers on the clock. it runs and idles but not perfectly... any help would be appreciated! here are the issues: 1. I can only start it with the choke closed even when it is warm. 2. ocassional backfire (and i did adjust the valves once) 3. it will start and idle around 1500 rpm. with my hand off the trhottle the whole time it will go up to 4000 rpm until it backfires then will slow down, over and over. __________________ 2008 200cc dirtbike
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