So here's the deal...I was helping a friend get his bike back together after his 70cc Airsal ate the crank bushing. We installed a new TOP crank, new main seals (we didn't touch the output seal since we didn't have the right one) and installed a new bearing on the flywheel side. The clutch side bearing had this weird bearing with a groove/lockring in it, so we pulled it from the old crank and put it on the TOP crank. He is running a DMP pipe, and a 14 Bingalingadingdong with a 92? jet. He was running this carb and pipe set-up prior to the break down and repair of this engine, and it ran beautifully.
So, we slap everything back together, the bike kicks over after about 4 kicks, idles fine. Throttle response is slow, and it lacks power, and seems to top roughly around 25mph. Currently, there is no air filter on the carb. Pulled the plug after a few minutes, it was blackity black.
So, does this sound like an overcompensated airleak, or does this sound like wayyy too rich jetting? Could the new crank have a longer or shorter stroke that may be causing the trouble?
I figured that if there was an airleak, the idle screw would not have any response when adjusted. The bike reacts to the idle screw. Thoughts? Suggestions? Thanks!