GS250T fades, stalls then won't turn over

[rwms71]

I see what you mean now. I can't remember if I checked this or not. I just checked the manual and the end gap (fitted) are
top........ 0.10 to 0.25 mm service limit 0.70 mm
second... 0.10 to 0.30 mm service limit 0.70 mm

0.10 mm is really small, that enough? I am fairly sure the rings did not touch when on the piston.. So should not when in the cylinder?

[John Park]

If you hold the end of the crank it should push/pull in and out a bit- say about ten thou - quite easily. If it won't do the same when it's hot, then the crank is tightening up. It will have less endplay when hot because the cases expand outwards against the thrust bearings, but there should be some play always. It's a long shot, but a free and easy test.