DIYbanter - View Single Post

On 29 Mar 2006 08:57:13 -0800, wrote:

have recently bought a KTM 125 motocross bike. I got this bike cheap
as it starts and runs but will not rev to its full potential. I have
fitted a new plug, stripped and cleaned the carb, decoked the exhaust
but to no avail. The bike starts first time without any trouble and
will rev up to about 1/4 throttle but any more and the whole engine
bogs down and will not rev any higher. By holding the throttle wide
open it puffs and splutters and tries to blow the exhaust off, I
believe this to be a backfire? does anyone have any ideas of where I
should be looking to solve this problem. many thanks. nigel.

Reed valves are bad? And have you checked the compression?

Gunner

"A prudent man foresees the difficulties ahead and prepares for them;
the simpleton goes blindly on and suffers the consequences."
- Proverbs 22:3