setting valve clearance on a Cub

Charlie M · Aug 20, 2018

I messed up the rotor position on my Cub (off 180 degrees) so when I was setting valves I thought I was on the compression stroke for number 1 piston when it was actually #3 and same difference for setting all them. Since 1 and 3 or 2 and 4 would both be at top dead center at the same time can the valves be set correctly when not actually on the compression stroke. I'm wondering if there is enough difference to need to reset my valves.

khouse6 · Aug 20, 2018

as long as pistons are on top dead center. it makes no difference. (they do not know whether they are on compression stroke or exhaust stroke)

Bob · Aug 20, 2018

(quoted from post at 10:50:20 08/20/18) as long as pistons are on top dead center. it makes no difference. (they do not know whether they are on compression stroke or exhaust stroke)

DOESN'T work that way, khouse, at the end of the exhaust stroke, the valves will be at "rollover", exhaust is closing and intake is opening, you CANNOT set the valves at that point.

For the O.P. ...

Valve%20Lash%20Adjusting%20Procedure.jpg

gene bender · Aug 20, 2018

Hey on exhaust stroke the exhaust valve would be open so you cannot set valves on exhaust stroke

rustred · Aug 20, 2018

that is totally false. when NO. 1 CYL. is on compression, the valves on no. 4 cyl. are on the rock so they can not be adjusted . two ways to set valves... follow bobs sheet, or follow firing order. no wonder people cant get an engine to run properly, because the valves must be adjusted meticulously. even two people using the same feeler guage will have different settings.

setting valve clearance on a Cub

Charlie M

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khouse6

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Bob

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gene bender

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rustred

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