I have a 7hp Briggs L head (made in 1980) that has sat for around 10 years. It is on a snow blower.
Hot spark, starts easy after cleaning up the carb, (was surprised to see it was actually pretty clean to begin with) but bogs heavy, can't find happy medium for hi speed carb adjustment between running full speed under load vs not under load though it does respond as expected to changes in carb adjustment. Doesn't smoke at all whether under load or not. Wondering if the valves could be sticking on account of the bog.
No compression test done because of the compression release Briggs builds into the cam but it does pull over on the recoil with a typical amount of effort to pull vs others I have worked on over the years, no easier or harder to pull over than expected so I believe they are sealing when closed, I have seen much worse carbon build up thru spark plug hole on other engines.
Spark plug itself that came with it nice and tan color, no excessive build up so I am thinking that when it was regularly run it was set up pretty close to right, and is overall a pretty healthy engine.
So what else would cause it to bog so heavy, which is why I was thinking that the valves could be sticking a bit.
Thoughts from the peanut gallery?
Hot spark, starts easy after cleaning up the carb, (was surprised to see it was actually pretty clean to begin with) but bogs heavy, can't find happy medium for hi speed carb adjustment between running full speed under load vs not under load though it does respond as expected to changes in carb adjustment. Doesn't smoke at all whether under load or not. Wondering if the valves could be sticking on account of the bog.
No compression test done because of the compression release Briggs builds into the cam but it does pull over on the recoil with a typical amount of effort to pull vs others I have worked on over the years, no easier or harder to pull over than expected so I believe they are sealing when closed, I have seen much worse carbon build up thru spark plug hole on other engines.
Spark plug itself that came with it nice and tan color, no excessive build up so I am thinking that when it was regularly run it was set up pretty close to right, and is overall a pretty healthy engine.
So what else would cause it to bog so heavy, which is why I was thinking that the valves could be sticking a bit.
Thoughts from the peanut gallery?