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2007 Ltr 450 Problems (backfiring)(bogging)

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Ok, so yesterday i picked up a 2007 ltr 450 for pretty cheap, looks like the quad was raced and the guy said it has a crank put in it. Well it idles somewhat fine but when you push the throttle all the way in, it like bogs and backfires a lot shooting flames out the exhaust. i let it warm up properly and then take it down the street and when you try and get in it, it just bogs, backfires, and has 0 power. just wondering if anyone has any ideas. thanks

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fuel filter, injector, fuel pump to start with.

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Sounds like you are dumping fuel.  Could be the main jet is too large.  Does the bike have an aftermarket pipe and air filter?  Any airbox modifications?


I would pull the carb give it a good cleaning and see what size jets are in there.  Not sure what the stock sizes should be, but a quick google will give you the answer.  If the bike has a pipe and air filter / air box mods you will need a larger main jet than stock.  Also have you tried a new plug?


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