Posted by warbaby on June 03, 2021 at 05:00:37 from (24.247.205.221):
In Reply to: Cub block posted by grandpa Love on June 02, 2021 at 16:20:11:
Those exhaust valves gotta go. They are already on the ragged edge of being warped and burnt. Pop all your valves and look at where they contact the seat- you should have a nice smooth consistent band around the seat and valve where they meet. If not, you might need some grinding done. If you are lucky you'll just need a bit of compound to bed in your new valves. Its not a high revving, high compression engine so you dont need to go overboard, just get them to seal tight enough to hold a teaspoon of ATF without it draining past them.
The other rust spots are all in the combustion chambers, above the valve seats and away from the sealing areas that make contact with the head gasket. They cant cause any problems besides maybe lowering your compression ratio .0000000001% and giving carbon deposits a handy place to hold onto.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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