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Now time to check & align the the rotor to TDC... (use a 14mm socket on the rotor bolt to turn motor).

Edited: Special care is needed to insure that the chain does not get caught while lining top dead centre up. To do this pull upwards on the chain keeping the tension on the chain while turning motor to TDC (top dead centre)

Install cam shaft sprockets & cam chain begining with the right side (exhaust) making sure that the camshaft lobes are facing away from each other like the pic below..

Line it up as shown in pic below install one camshaft sprocket bolt finger tight to hold in place. Now do the same with the other until it looks like this..

IMPORTANT: Take note of how the E on the camshafts sit & all marks shown below

  • The manual is not very helpfull for this part so line all marks as shown below...

It looks as though it is wrong but i can assure you this has been double checked. The discrepency is the fact the the rotor outer case is a little out of line from the inside case. This is not a problem but weird it would be made like this??

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Q: What are the timing marks on a Yamaha TTR250?
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