New Thumpertalk user, seasoned rider and wrench here. Newly converted smoker to stroker. 07 YZ450F.
I recently bought this bike and it ran great. However, it was blowing water out the radiator overflow. Discovered a loose headbolt and obviously blown head gasket. I tore it down and bought a OEM top end gasket kit. Reassembled and it started on the first kick. I took it out for a ride and it runs exactly as before and maybe even a little more power. However, I get an off idle hesitation that if I just flick the throttle real quick, it sometimes even dies.
Initially I thought maybe it was just still cold. Considering that's it's holding its water now, maybe it takes a bit more to warm up. Not so. Then I thought maybe the throttle pump. Nope, it is squirting nicely when I twist the throttle while the bike is off. So now I'm a bit stumped.
Now I'm wondering - There are 3 marks on the flywheel when timing the engine. They don't seem to be far enough apart to make any difference in timing. As long as you're within the range of the 3 and your cams are lined up, all is well. Is it possible to be one or 2 marks off on the flywheel?
Anybody have any idea why this would start hesitating simply be replacing a head gasket?
Thanks in advance