Make sure barrel and piston are in good working order ,
I use these Barrels and these pistons from Ebay UK here , make sure you hone the barrel before starting this job .
First block the cases , as dropping something into the bottom of engine now would mean stripping it all out again .
Believe me i have done , and thought all would be fine , and it cost me a lot of money to find
out otherwise . ( never again ) if something drops in the engine strip in out !!
fit pin and circlips
hone barrel if not already honed
fitting cylinder over the piston rings , oil may help this part
pull chain through
setting up timing marks on the upper chain gear
fit tensioner
setting the torque of the cylinder head nuts
6mm 10nm . 8Nm 22Nm
fit the flywheel , make sure chain stays on behind it
timing marks on the flywheel
timing marks on upper chain gear
see more Yamaha YBR 125 blog posts
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