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Discussion Starter #1
Hello everyone thanks for having me I have a 2004 trx400fga that I got as a gift when I was 12 mostly every thing on it is stock. 3 years ago the stator went on it, took the stator out and bam had a kid and so the quad sat till about a week ago I got the new stator in and all back together did the valve adjust as well because it was never done befor and it ticked like crazy, got on tdc on the compression stroke set it at .006 put that all back together went to start it just get clicks had to tap the starter to get it going. Turns over good no start has spark hit it with ether then engine dead stops and shoots the ether back through the carburetor I dont know if I messed up the adjustment of the valves or some how messed up the timing when putting the new stator in. Info is really hard to find on this quad plenty on the 350 and 450 but lacking on the 400 any help would be appreciated thank you
 

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the 400 is almost the same motor as the 450. from the sounds of you saying its back firing from the carb ?, this tells me it jumped time, time to tear it down, and have a look at the cam chain , replace with a D.I.D. cam chain.
 

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You mentioned you did a valve adjustment , it ran before ?? maybe when you adjusted the valves , you were on TDC but on the wrong stroke ---check out atv.honda.com
 

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It did run before ticked like hell but did run. I believe I was on the right stroke there was a little play in the valves when I got it on tdc but I will check again is there a more exact way of know if I'm on compression stroke. have the carb out now to give it a good cleaning idk if that could somehow cause this but it probably needs it anyway, does anyone know if I could of messed the time up when I had the stator out because besides that I dont think it just randomly jumped a tooth and thank you both for your response
 

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I don’t think you do any timing adjustments when you’re removing the stator. If it was making a lot of valve noise before it could have finally jumped time or you didn’t set valves properly. Were they way out of adjustment?
 

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Discussion Starter #6
The .006 feeler gauge slid right in so It was definitely out of adjustment but I did not even try starting it till after I readjusted them
 

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a stretched cam chain is about the same thing as it being out of time, same as jumping a tooth !. with it being an '04 ?, chances are..the cam chain has never been replaced !.
 

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the 400 is almost the same motor as the 450. from the sounds of you saying its back firing from the carb ?, this tells me it jumped time, time to tear it down, and have a look at the cam chain , replace with a D.I.D. cam chain.
He has the 400 Automatic, not the Foreman.
 

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I would double check the valve clearance and clean the carb. TDC on the wrong stroke will have the valves open slightly. If you adjust on the wrong stroke then turn it 1 round you will have .050 valve clearance.
 
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