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Discussion Starter · #1 ·
I just rebuilt my 2005 trx450r and it ran fine before I took it apart. Now after reassembly it starts up and runs fine and is responsive up to 9500 (about anything over half throttle) rpms and falls straight on its face like the ignition is missing. I played the jetting game for awhile thinking it was the issue but no matter what i did it didn't help at all. I am running VP c12 in it. I have double and triple checked valve clearance and cam gear timing and they are spot on. I have also tried a different cdi box and a different coil and nothing changes. I am running out of ideas!! I have been around power sports all my life and its frustrating to me that it isn't doing any of the normal things that pin point a certain problem. If you have any ideas or suggestions please leave comments. I need all the help I can get. Missed half the ice racing season been working on the issue for a month and I keep coming up empty handed time and time again.

Thanks
 
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