02 400ex timing chain 1/2 tooth off!? - Honda ATV Forum
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post #1 of 21 (permalink) Old 02-25-2013, 10:02 PM Thread Starter
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02 400ex timing chain 1/2 tooth off!?

I just bought a brand new OEM 400ex timing chain and a stage 1 hot cam. I removed the decompression pin and spring. I put the crank mark right align with the hash mark right before the T. I install the sprocket as directed by the service manual, I do everything perfect but when I rotate it another 720 degrees back to the l T mark the lines in the camshaft gear are off 1/2 tooth. I tried advancing it a tad so when the tensioner kicks in it will pull it perfectly aligned. I was screwing with it for hours I can't get it right. What am I doing wrong!?!?
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post #2 of 21 (permalink) Old 02-26-2013, 07:33 AM
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You said you advanced it some so when the tensioner kicks in it will be perfectly aligned? As soon as you set the timing, you must install the tensioner and put tension on it. If you are rotating it without the tensioner in, it will definitely have some slack and appear off. Appear is the keyword. If the tensioner is not in and it's only half a tooth, you likely have everything lined up correctly. But install the tensioner and double check.

Last edited by Tippmann98; 02-26-2013 at 10:36 AM.
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post #3 of 21 (permalink) Old 02-26-2013, 07:35 AM
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After the tensioner puts pressure on it , it will rotate back a little
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post #4 of 21 (permalink) Old 02-26-2013, 10:23 AM
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post #5 of 21 (permalink) Old 02-26-2013, 10:32 AM
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Quote:
Originally Posted by WillNemeth90 View Post
I just bought a brand new OEM 400ex timing chain and a stage 1 hot cam. I removed the decompression pin and spring. I put the crank mark right align with the hash mark right before the T. I install the sprocket as directed by the service manual, I do everything perfect but when I rotate it another 720 degrees back to the l T mark the lines in the camshaft gear are off 1/2 tooth. I tried advancing it a tad so when the tensioner kicks in it will pull it perfectly aligned. I was screwing with it for hours I can't get it right. What am I doing wrong!?!?
i'm no expert by any means when it comes to sport bikes !!..buttt..i would like to ask..and throw this out to you..you said you put an after market cam in right ?..buttt..you installed an oem cam chain ?..soooo..my question is..is the after market cam sprocket bigger..smaller ? than the oem cam sprocket ??..this maybe why you can't get the timming marks to line up ?. just a thought here...lol.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '05 trx500fm
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post #6 of 21 (permalink) Old 02-26-2013, 10:35 AM
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Hey Shade - I'm pretty sure the sprocket will be the exact same. It's the lobes that are different on aftermarket cams.
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post #7 of 21 (permalink) Old 02-26-2013, 10:43 AM
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Originally Posted by Tippmann98 View Post
Hey Shade - I'm pretty sure the sprocket will be the exact same. It's the lobes that are different on aftermarket cams.
i would like to know for sure ?, i'm learning here mind you !..lol. something about this after market cam is throwing the cam chain off ?..orrrrrrrr..the tensioner is not working right ?. if he has a new oem chain ?..and the hash marks are not lining up like they should ??.there is a reason for it !..lol. maybe he's not setting the crank right ??..i don't know ??..what i do know is..with a new cam chain..a new after market cam...it all should line up right !..wrong head gasket ?..base gasket ?..something is not right !.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '05 trx500fm
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post #8 of 21 (permalink) Old 02-26-2013, 10:58 AM
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If you read his post it sounds like he is checking it all without installing the tensioner which will no doubt make the timing "appear" off a half tooth.

I've got a set of WebCams in my dirtbike. The lobes are shaped differently to create more lift and changes the duration but there is absolutely no difference in the sprocket size. A different sized sprocket would throw the timing off. You could set it right but after rotating the engine over back to the compression stroke it wouldn't line up at all with the TDC mark.

Last edited by Tippmann98; 02-26-2013 at 11:02 AM.
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post #9 of 21 (permalink) Old 02-26-2013, 11:06 AM
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Quote:
Originally Posted by Tippmann98 View Post
If you read his post it sounds like he is checking it all without installing the tensioner which will no doubt make the timing "appear" off a half tooth.

I've got a set of WebCams in my dirtbike. The lobes are shaped differently to create more lift and changes the duration but there is absolutely no difference in the sprocket size. A different sized sprocket would throw the timing off. You could set it right but after rotating the engine over back to the compression stroke it wouldn't line up at all with the TDC mark.
i read his post...and your prob right ?..as he really does not get into detail if and when the tensioner is in ?..or bolted up ?..or what ?..lol. sooo..i really can't say. other than..they all should line up !..if not ?..then something is wrong somewhere !..lol.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '05 trx500fm
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post #10 of 21 (permalink) Old 02-26-2013, 01:32 PM
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Quote:
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Quote:
Originally Posted by Tippmann98 View Post
Hey Shade - I'm pretty sure the sprocket will be the exact same. It's the lobes that are different on aftermarket cams.
i would like to know for sure ?, i'm learning here mind you !..lol. something about this after market cam is throwing the cam chain off ?..orrrrrrrr..the tensioner is not working right ?. if he has a new oem chain ?..and the hash marks are not lining up like they should ??.there is a reason for it !..lol. maybe he's not setting the crank right ??..i don't know ??..what i do know is..with a new cam chain..a new after market cam...it all should line up right !..wrong head gasket ?..base gasket ?..something is not right !.
aftermarket cams use the stock cam sprocket just have different shaft with taller and fatter lobes.
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