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Discussion Starter #1
KTM 125SX 2003 not hitting powerband properly

soo i recently got a full engine rebuild on my ktm 125sx 2003. new crankshaft, bearings, piston, rings etc. when i broke the engine in properly and tried opening it up a bit, it wasnt hitting the powerband correctly. so then took it apart again to look at powervalve components, i ended up replacing the control arm, powervalve governor and the powervalve plate. put it back together and there was a slight improvement, but not that huge kick it should have. Thinking about taking the carb apart but i a have my doubts because its not spluttering. any suggestions would be amazing.
Thanks in advance :)
 

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is there are 'cover' on the left hand side top of engine case ? take this off with engine running you should be able to see if power valve is open fully and at what point it starts to open
 

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thanks for the reply.
done that today. and it moves up down, when bike is revved. sounds like a 4 stroke, very sluggish.
 
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