How to time a 400 [Archive] - ATV Riders Forum

ebanezar

10-19-2002, 09:11 PM

I just got done tearing my 400 apart getting ready to make it into a 440 and was wondering how to retime it.

I thought there would be a silver link on the timing chain like on a car but there is not.

I have not purchased a shop manual yet but I plan to have one before I start to reassemble.

::confused:

redrider ex

10-19-2002, 09:16 PM

is down on your fly wheel line up the (T) mark and on the cam sprocket line up the timing marks .

ebanezar

10-19-2002, 09:21 PM

I found the ones on the flywheel but there is a mark for tdc compression stroke and 1 for tdc exhaust stroke how do you know which one to use? And there are several marks on the cam sprocket. Which one should it be?

thanks

ebanezar

10-20-2002, 08:12 AM

bump

Sick0

10-20-2002, 08:30 AM

Yeah so how do you find out where the compression strokes is.

crashinmatt

10-20-2002, 08:46 AM

im not sure if this is true or not, but i heard that the 400 sparks the spark plug every revolution, both on compression and exhaust. if this is true, then i dont think it really matters if ur on exhaust or compression stroke. all i did when i tore mine down and put it back together is i lined the bottom t mark and then the cam and it runs great.

jaspurx

10-20-2002, 10:20 AM

get the shop manual it is all in there in great detail. i know , i have one.

RED121572

10-20-2002, 10:40 AM

As Jas says, get the book. Its got lots of words and pics.

Let us know how it all comes together for you!

skemp

10-20-2002, 07:30 PM

Just get it to TDC, and if the rockers have play, it is on compression.

RytM1

10-20-2002, 07:58 PM

Line up the Timing mark when the cam lobes are down. On the timing gear, there are 3 lines. One of them points up, and the other two get lined up parallel to the top of the cylinder head.