Hi guys. Just recently put together an 80cc bike. I got the motor on eBay (not BGF) and all was well. I installed new mounting studs, headstuds, etc. I got it all running smoothly and decided to take it for a cruise. About a mile away from home it started running weird. I looked down and my carb was loose on the intake. I guess the clamp wasn't tight enough. Luckily I had tools with me in my backpack so I put the carb back on and tightened it and it didn't want to run right. I casually rode back home and here are my issues:
Runs fine at low speeds. When I get over 10+ mph it starts sputtering and running very bad. It won't go over a certain rpm...if I hold the throttle with the clutch pulled in it will do the same thing. If I'm riding up a hill with a constant throttle position and let go of the throttle and quickly full throttle it will rise in RPMs. I am thinking maybe it is running too lean. Any help?
Here are some pics...
Runs fine at low speeds. When I get over 10+ mph it starts sputtering and running very bad. It won't go over a certain rpm...if I hold the throttle with the clutch pulled in it will do the same thing. If I'm riding up a hill with a constant throttle position and let go of the throttle and quickly full throttle it will rise in RPMs. I am thinking maybe it is running too lean. Any help?
Here are some pics...
![](/proxy.php?image=http%3A%2F%2Fi707.photobucket.com%2Falbums%2Fww71%2Fcarbonfiberoptics%2F8f4863b4.jpg&hash=b5b5f4078e665db43fcf8bd24cccdccc)
![](/proxy.php?image=http%3A%2F%2Fi707.photobucket.com%2Falbums%2Fww71%2Fcarbonfiberoptics%2F54e4a136.jpg&hash=127318124ca65478fb109ce5e6cb3c14)