The Beast is sick... low compression -- 75 / 40 / 90 / 90 psi

[blowerbike]

why not do a leak down test?
i never liked the wet test because when you add liquid you loose space and artificially raise the compression/cranking pressure.
a leak down test will tell the tale.

[exdirtbiker]

Fogging and soaking with Seafoam did NOTHING for me. Except now the bike barely runs worth a $n1t.
Started it, idled until the smoke cleared ( most of it) then took it for a mile or 2 to put a load on it. It actually stalled on me approaching a turn.
Same compression readings... engine warm, throttle wide open.

"when you add liquid you loose space and artificially raise the compression" ... yes, I saw the numbers jump to 130 -135 on first try. then I cleared the gauge and did it again. and again. and the readings settled out at 120-ish.

I still don't trust my gauge, but I still get one hole 50% lower than the others. (#2)

I might have time to play with it again next month.. :-(

[exdirtbiker]

Looks like I may have time to play this weekend. :-)
If the jugs are bad...
I don't think mine can be bored again. Can they? They are already at 1085. What are the chances I can go from 73 to 73.5mm ?
Do all the 8V 1000 jugs from 77 to 80 fit? I read somewhere certain 1100 jugs also fit. Anyone certain of exactly which ones?

I know I'm jumping ahead a bit, since I haven't found the true cause of my problem... But I enjoy exploring all the options.

[exdirtbiker]

It finally happened... I had time to play.
and I learned quite a bit...
Like.. this bike has NEVER had a big bore kit, looks like the original pistons are in there !
2.756 in bores = 70.002mm. all bores look new.

Piston skirts look used but OK.

Pictures later today...

[exdirtbiker]

The bores look great..




The oddball color valve is not the hole with low compression


looks like someone did a little work in here...



I don't see any sign of ring problems...