How To Adjust Valves

Time saving tips to keep your Cub running smooth
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Gary Boutwell
10+ Years
10+ Years
Posts: 2758
Joined: Wed Apr 23, 2008 10:10 am
Zip Code: 70401
Tractors Owned: 3 barns full of Cubs and implements in various stages of disrepair
Location: LA, Hammond

How To Adjust Valves

Postby Gary Boutwell » Tue Aug 18, 2009 9:33 pm

Adjusting Valves

Take the carb off, take the inspection plate off. (also easier if you remove the manifold.)

Remove #1 sparkplug (the one closest to the radiator.)
Rotate engine till both valves in #1 close. Look in the hole. & the pointer is at the notch in the crank pulley. #1 is at TDC at this point.

Check clearance on 1, 2,3 & 5. Adjust to .015 clearance cold.

Rotate engine 360 degrees until #4 is at TDC.

Check clearance on 4, 6, 7, & 8. Also adjust to .015 cold clearance.

Repeat and double check everything.

Get a new gasket from TM (one of our sponsors) or use good sealant and install the cover plate.
Install the manifold (if removed), the carb and any spark plugs you took out.

It should now run much better without the clatter.

Good luck and keep posting.
Louisiana Cub Fest, March 5 & 6, 2010
Gary Boutwell
Hammond, LA

3 barns full of Cubs of various condition

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