yzroostinya? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 04-24-2002, 05:35 PM
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yzroostinya?

when u did the topend of the xr350 or the valves what ever u did was it hard? did u have a service manual? what comes out when u take the cam out?
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post #2 of (permalink) Old 04-25-2002, 06:50 AM
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Re: yzroostinya?

its actually pretty easy just time consuming.

the motor was apart when i got it(top end)

i put on a new piston and rings on the rod, slid the cylinder on and checked for ease of movement(piston). torqued to spec. then had shop press in new valve stems. then i lapped the valves(you put a sandpaper like paste between the new valve and existing seat and spin unil it marks the valve). cleaned head thorouly with water and put all valves and springs in. put head on cylinder and torqued. pulled cam cahin up into head and assembled tensioner. slid cam and cam gear through chain let sit loosely. turned motor to top dead center(tdc) on compression stoke. alinged marks on cam even with head. tightned cam gear to cam. set tensioner. put valve cover on head and set intake valve clearance to .002 and exhaust to .003 at tdc. then tightend motor to frame. assembeled carb to motor..... started- wow it runs. had manual. let run for 1 min and changed oil(lots of debris left from previous blow up). started again and let run for 10 min. changed oil and let cool down completely wit fan on it while it was runnin.drained oil. started again and let run with fan for another 10 min and cool down. started again and rode for 10 min 50% capability. cool down with fan. "" 60%. "" 70%. ""80%. "" 90%. broken-in completely changed oil and re-checked valve clearance. cleaned carbs and installed bigger mains to accomadate supertrapp and high flow filter. will let you know about the latter on monday when it gets reassembled as i am waiting for the intake manifold(rubber boot craked). you def need a manual. replace all gaskets and preoil cylinder and ALL moving components before and during assembly. it would be ten times esiaer now since i have seen the bike apart and together. before all i had to work with was the manual sinc the bike was in peices when i got it.
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