Briggs vtwin intek 20hp running on one cylinder

[davidsh]

Hi Fish,

Unfortunately the feeler gauge I have only goes down to .008 (I think I read somewhere its supposed to be .004 clearance) so was a bit reluctant to go adjusting until I picked up a new one. .008 was very tight on the intake but wouldn't fit in the gap for the exhaust valve - so maybe it is too tight (and intakes too loose).

I guess that's my next step - get a new gauge and make sure they are correctly adjusted?

I did the "screw driver in the spark plug" test too on both sides and the pistons are moving as expected.

 

[Tiger Small Engine]

Hi Fish,

Unfortunately the feeler gauge I have only goes down to .008 (I think I read somewhere its supposed to be .004 clearance) so was a bit reluctant to go adjusting until I picked up a new one. .008 was very tight on the intake but wouldn't fit in the gap for the exhaust valve - so maybe it is too tight (and intakes too loose).

I guess that's my next step - get a new gauge and make sure they are correctly adjusted?

I did the "screw driver in the spark plug" test too on both sides and the pistons are moving as expected.

Your compression readings on cylinders are varying widely. Don’t think adjusting valves will be the fix for that large a difference, however, it is a good first step.

 

[Fish]

The one valve/rocker looks tight {as in not letting the valve fully close}. But unless the jamb nut/adjuster is loose, it would mean that something else is up, like maybe a loose valve seat.
But I may be wrong, as I am not there to really see things.