sprintfire dies after full throttle

[Mathew Robert]

I give it full throttle then after a bit dies until i let off, it has new crank seals, fuel pump and lines.

[klonteig]

Hey Mathew,
I see you're from Chatham as well! I had my 300 out this weekend ripping around the yard with the kids and it was doing the same thing. Never really died but after a few good laps it would just fall on its face as it ramped up. I topped it up with new gas and filled the tank and the problem went away. Not sure if it was due to old gas or just low enough in the tank that it was not pulling from the tank as it accelerated and fuel moved away from the pick-up... I hope your problem is as simple as this one. Thought I would mention it though, as it might be worth a try.

[Matt]

Check your plugs - when it starts to die, shut off the engine. Pull the plugs and check the color. See if you are rich or lean.