Hi guys, I was riding my bike yesterday around in the city (SM wheels), it ran fine, but on the way home, (i was like in 3rd,4th gear) suddenly the engine started stammering, no power, did pull over, engine runs in idle but the sound in the exhaust is very strange like the gas woul ignite in the exhaust pipe. Or something like that, pretty hard to explain, will try to upload a sound file. So I've stopped it, looked for cracks/holes, but nothing. Could kick it over, it started on first kick, strange sound still there, try to open the throttle, but it's not gaining rev, just very little, but strange hitting/exploding sound gets louder. If I open the throttle to 1/2, it fires like 15cm flames out of the exhaust. Pre: Friday I've installed new piston, readjusted valves, cleaned air filter (is still sticky from that blue oil stuff, but that shouldn't be a problem, right?) Now I'm trying to find out what's the problem. What I know : - timing is OK (took valve cover off) - spark could be stronger, but there is spark - today I will try with a new plug (but I don't think that could cause the problem) - Don't know about the carburetor !!! Could be some bog there? Not getting enough gas? (tank is almost empty also) Did not mess with the carburetor, did not adjust anything! So if you have any ideas! Let me know pls! Weather is really nice now and I want to Rideeeeeeeeeeeee!