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Old 07-20-2012, 08:35 PM   #1 (permalink)
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How do you set the timing on 400ex

I had to replace my piston and rings in my 400ex but i have i manual on it but its a little tricky to time i think i have it on tdc but im not sure cause it has to different marks on the crank shaft........ So can someone please let me know which mark is for tdc so i can ride some time soon
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Old 07-20-2012, 09:02 PM   #2 (permalink)
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There should be two marks.......a "T" mark and an "F" mark. Use the "T" mark to set the cam timing.
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Old 07-20-2012, 09:13 PM   #3 (permalink)
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how would i know which one is the t mark cause it doesnt have and letters on the marks
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Old 07-20-2012, 09:44 PM   #4 (permalink)
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It should have a "T" and an "F"......they're just hard to see sometimes. If you can't see them, remove the sparkplug and put a drinking straw down into the cylinder and let it sit on top of the piston. Now rotate the crankshaft until the drinking straw comes all the way to the top and stops, before starting to go back down. When the piston is exactly to the top of it's stroke, that is top dead center and it should be aligned with the "T" mark. That's what the "T" stands for.......top dead center. When you're satisfied the piston is all the way to the top of it's stroke, just look at the marks on the flywheel and the mark that's aligned on the flywheel should be the "T" mark.
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Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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Old 07-21-2012, 11:56 AM   #5 (permalink)
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thanks for all your help....... cause im bout to put it back together and i had to figure this thing out and i didnt want mess nothing up........ i already have the piston out but i think the crankshaft had move a little on me and im not sure if its on tdc or not....... so do you think i can put it back on tdc center after i put it back together and then time it
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Old 07-21-2012, 08:45 PM   #6 (permalink)
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Make sure you turn it over by hand a couple of times and check your timing before cranking it up.
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Old 07-22-2012, 08:09 PM   #7 (permalink)
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how would i turn it over by hand to check the timing on it
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Old 07-22-2012, 10:16 PM   #8 (permalink)
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Quote:
Originally Posted by cpapillion1987 View Post
how would i turn it over by hand to check the timing on it
Take the plug out of the crankcase cover and put a socket on the end of the crankshaft and turn it with a breaker bar.
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Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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Old 07-23-2012, 06:14 AM   #9 (permalink)
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thanks again tonight or tomorrow i will let yall know how did it go.......but hopefully i will get this thang right so i can go riding soon
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