Txt Pro 250 Throttle Problems

[ttmoore09]

Okay so im not 100% sure if this is normal or not.

But i pull the throttle a tad the engine seems to die down a little bit, then when its pulled a fair bit more thats when the engine responds in a good way.

Is this a problem?

I find that its a problem cause if im preparing for a obstacle, the only way i can get passed it, is rev the bike to max revs for few seconds, then i can get power via the letting the clutch out...

For example, Its almost not possible to start the bike up, then try and pull a wheelie without first getting the revs really high, else the engine dies if in rev it and slip clutch at same time

Im really new to trials, so not sure if i can tune the engine etc somehow (how much fuel engine is getting etc)

thanks

[thats_a_five]

This is definitely NOT normal. Trials bikes are designed to have good torque all the way from low RPM. It sounds to me like a very lean condition. I would start with a good overhaul of the carb, and fuel filters. While you have the carb off, take a look at the reeds to be sure they are not cracked or not closing completely. There also might be a bad crank seal that is letting air in, but that's more work to get to.

[wobbly1]

Not normal. I would start with the carb. Strip down and check for any blocked jets.

[ttmoore09]

Okay thanks ill take a look tomorrow.

[laser1]

A clean carb is a must - but a very lean fuel screw setting will mimic those problems - I would try setting that. Typical PHBL settings around my neck of the woods is 3 to 3 1/2 turns out. If your setup much less than that - try a richer setting. (and remember its a fuel screw on the PHBL!)

Edited April 24, 2012 by laser1