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Cam timing???? help fast plz
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Posted by: browning

Rebuilding a 250ex motor..and got a new cam..how do i align it? most small motors you align then dot to dot or something close to that..but i dont seeing any signs of how its supposed to alined or times?

Posted by: tommyboy3

Some times there is a small hole or triangle stamped on it.And it might have to be pointed down.I have had some luck calling the dealer service dept. And asking for information.Good luck to you.

Posted by: browning

does the piston need to be at tdc?

Posted by: tommyboy3

Yes in most cases.I think there is a tread on this forum that tells you how to do it.

Posted by: browning

i have yet to find the topic..this is pissin me off..im wanting to get this bike running..i buttomed it all together..its sucking in air but not blowing it out..can someone please help

Posted by: tommyboy3

The cam turns 2 times for every 1 time of the crack shaft. You could be 180 deg off. Pull the rear cover on the rear of motor.The three bolts. And you will see a bolt. Then remove the the timing window cap and spark plug. Turn the bolt till you see the T mark aline with the the mark in the hole of the timing cap hole. With the rocker arm cover removed you should have the set free play of the valve set ajustment. If not turn 1 more time around. If you set your cam timing right this should work. Good luck.

Posted by: browning

where the timing cap window? and what T mark..

Posted by: tommyboy3

There is a round cap with a hex. It is above the shift lever. Good luck.

Posted by: browning

okay..after i do this..what exactly am i doing to figure out my timing?

Posted by: browning

with it lined up on the T ..how should i postion the cam?

Posted by: browning

any one..i wanna finsih this bike so i can get it out of my garage

Posted by: browning

some one

Posted by: keithpincock

You need a shop manual: http://www.filefactory.com/f/a7914ec899e4e025/