New jug & pistons a little hot, do I worry?

YAMAJOHNNY

YAMAJOHNNY

New member
Joined
Oct 5, 2006
Messages
27
Age
67
Location
Sugar Grove Il.
I just finished putting in a replated jug from Millenium & 2 new SPI pistons on my 96 600. The failure was caused by a dirty carb. After assembly, it fired right up, ran smooth, no weird noises, YES!. However, after about 5 minutes of running, the side with the new jug was noticeably warmer than the side with just the new piston. I had .005 piston clearance with the new jug, & .007 with the old jug. Ring end gap on both was .015. It was not hot enough to burn my hand, but "warmer". Is this something normal due to break in, or am I a little tight on this side? Thanks in advance.
 
The guy @ Millenium told me .004 to .006 per inch of bore for end gap. 3" bore = .012 min. end gap. The sheet that came with the pistons said .004 to .006 piston clearance. I thought I was on the money there. Cooling system was bled. Am I screwed???
 
YAMAJOHNNY said:
The guy @ Millenium told me .004 to .006 per inch of bore for end gap. 3" bore = .012 min. end gap. The sheet that came with the pistons said .004 to .006 piston clearance. I thought I was on the money there. Cooling system was bled. Am I screwed???
Click to expand...
well because you used SPI aftermarket pistons and rings you may be ok
i don't know the expansion rate. i was just crossing it over to yamahas
stock specs and your on the tight side for sure. but if thats what they
told you to use run her..
 
Thanks daman, I'll give her a shot. You know they make pistons every day, thats my way of supporting the economy & the snowmobile industry.(LOL)
 
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