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2005 trx450r WONT START !

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Hello all I am new to the site and just looking for some other insight. I bought this 2005 trx450r off a friend seized. Bike sat for 3 months before I purchased. The crank was the problem so I I bought a new OEM crank and bearing kit, and installed them yesterday. Now I know the bike ran great before it seized. But now it won't even give me a back fire, can kick the kick start 20 times and nothing. Now all the valves are in spec, I'm getting fuel ( maybe to much cause piston is soaked after 4-5 kicks ) and the spark is giving a blue spark. Just seems like it doesn't have enough kick to actually start. The only thing I haven't tried which I need to is a pull start.. Can anyone give any other insight to what this could be ? I'm boggled and have both a owners Manuel and full shop service Manuel for it. Thanks in advance eh Bikes aftermarket parts are dyna FS ignition map, hot cam stage 2, full sniper exhaust. ( engine effecting parts )

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So took it this morning for a pull start and she fired right up ! But now it won't stay running as soon as I let off the gas she turns off. I believe it's a carb problem, any insight on how to fix that carb issue ? Thanks.

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So took it this morning for a pull start and she fired right up ! But now it won't stay running as soon as I let off the gas she turns off. I believe it's a carb problem, any insight on how to fix that carb issue ? Thanks.

Yeah, get a Yamaha. Your carb might need rebuilt if it sat for three months, especially if it had old gas in it, or it might be a jetting issue.

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Thanks ahah as for bike brand it doesn't matter to me as I've owned them all but I like my Hondas. And that's the only thing I can think of now, it has to be a fuel delivery issue.

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So just an update I've fully cleaned the carb and put fresh gas and a new plug and still won't even give me a back fire. Will be taking all electrical connections apart this weekend and cleaning them and re checking timing.

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Cleaned the carb as just had a JD jet kit installed and have a complete repair manual so was able to take apart and clean everything. I've come to the conclusion it has to be valves.

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Cleaned the carb as just had a JD jet kit installed and have a complete repair manual so was able to take apart and clean everything. I've come to the conclusion it has to be valves.

I hope the head isn't completely trashed, that is a very expensive endeavor.

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No no I believe the top end is fine. I think it's a loss of compression as I can kick it over by hand which I know is wrong haha. Going to hone the cyclinder and get some new rings.

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So re checked valves and it's too dead centre all lined up. And exhaust is reading 0.282 which is spec but I can't even get a 0.051mm in the intake.. Why would there be no tolerance on the intake valves ? And would this cause my no starting problem ? Thank you.

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You're welcome and good luck. Post up once you get it running again

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So an update. I went and got new valves both exhaust and intake. A new top end gasket kit and shim kit. The bummer is well assembling I cracked the thermostat cover so I j&b welded it but during assembly today it leaked.. Anyways it's been a long build and was way to anxious to try and start it. On the second kick it fired right up !!! Beyond happy and stoked she is alive ! Need to fix the thermostat cover correctly this time or buy one..

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