06-05-2021, 03:18 PM
Ok, well - an update. Have changed the title to better signpost others.
All running well, breather breathing. Did 3 or 4 miles and thought I had some smoke out the back when up above 30mph on a long straight.
Plume of mist from pinhole in oil filler, and when I took the cap off, the mist (exhaust?) came out for minutes.
Plugs are trying to be brown, but took off head after checking compression:
75 85 80 80
Observations:
oil on piston tops as per photo
pistons +40 but not all matched and one is not facing to the 'front'.
Pistons don't feel unduly wobbly in bores at top or midpoint.
Bores clean generally.
Clearly I can see that I need to disassemble further now, but how far?! Do I have to determine the type of pistons now before replacing rings, or should I be safe and take to +050 and new pistons just to prevent future faff when new rings don't correct things?
All running well, breather breathing. Did 3 or 4 miles and thought I had some smoke out the back when up above 30mph on a long straight.
Plume of mist from pinhole in oil filler, and when I took the cap off, the mist (exhaust?) came out for minutes.
Plugs are trying to be brown, but took off head after checking compression:
75 85 80 80
Observations:
oil on piston tops as per photo
pistons +40 but not all matched and one is not facing to the 'front'.
Pistons don't feel unduly wobbly in bores at top or midpoint.
Bores clean generally.
Clearly I can see that I need to disassemble further now, but how far?! Do I have to determine the type of pistons now before replacing rings, or should I be safe and take to +050 and new pistons just to prevent future faff when new rings don't correct things?