Hello, right now I have run into some problems with my engine on my Volcano SV.

The problem is that after a little while of running it my acceleration is horrible and my top speed drops way down below its usual. What is funny though is that when I first start it up and let it idle for awhile it accelerates perfectly and the top speed is amazing but after awhile of running it really starts to die down, but if I shut off the engine and let it sit for a few minutes it will start out performing great and then once again start giving me trouble[:@]!!! It is so annoying because I have no clue of what it could possibly be and I to fell to good about it since I just got done rebuilding all 4 rear shocks, had to replace the manifold gasket, and my gears (but not my clutch bell) are starting to shear causing a not so smooth roll and I HAVE ONLY HAD 2 QUARTS THROUGH IT!!!!. I haven't been rough on it by any means and I fell a little uneasy about my buy[]

Could my engine problem be a leak some where? Ohh I also get lots of air bubbles in my fuel line if that means anything?

Any help would be great!!!
Thanks!