[Corey680]

Hey all,

I have a friend with a 600 Pro X. It feels like it is running in some sort of "Safe Mode" When you first pin it it leaps ahead, then falls flat on its face.
Carbs have just been done. Could this have something to do with the altitude setting with the PERC reverse setting? Any advise would be helpfull.

 

[whiteghost]

need more info, rpm it gets to would be nice if you have stuck ves it will not rev out. but when you say falls flat i am thinking more like 3-4000 rpm. are the clutches working right? could be a few things need more info

 

[YamahaSS440]

Sounds like TPS to me. Throttle position sensor if you didn't know.

 

[Corey680]

Problem solved. Was set on high altitude setting, and VES valves were DIRTY.
Runs like a champ now. Thanks for the input.