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Has anyone found a remedy for the notorious fourtrax shutdown problem?It will start back up fine but instantly shuts off when put in gear.

Pulled the top end off and the timing jumped a couple teeth in the gear, surprised it actually even ran. You can see in the one pic that the exhaust valves were hitting the piston, I’ll disassemble those this week and inspect to see if they are damaged. The tensioner appears to be the issue here’s a video as well. Is the cam supposed to have that much flop and is the chain supposed to be that loose even with a bad tensioner?  For reference in the videos I had not taken the tensioner out yet. Piston clearance is nice and tight. So do I need to replace the chain and guide?  I think I might just move to correct timing and put a new tensioner on and start there. Thoughts from anyone following along?   IMG_7531.mov IMG_7533.mov

Ron said he didn't think that mattered if I was only needing the LCD screen the ES models use the circuitry to do that but the screens are apparently the same. I'll double check that with him, to be sure

Just want to confirm. Engine has been rebuild ( +1 bore, new piston, new crank, new valves), Used the same camshaft. All sounds now very nice and quiet.

ok,  no problem :-). please keep in mind !!..i'm not 100% sure it is from a manual shift model ?..but i do not think it is from an es ??. i do recall working on my very first trx450s, and it was indeed a 1998 back then..lol.