HCS Snowmobile Forums - View Single Post - Stock deck to exhaust port measurement
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Old 05-16-2019, 02:24 PM   #10 (permalink)
Super Advanced Member
Join Date: Jan 2007
Posts: 597
Current Sled(s): 15 Pro s 800
Previous Sled(s): 03 f7,00 xcr 800,00 xc600sp,96 ultra,89 650,v-max 540, SS440
Location: northern il
Favorite Riding Area: Up
Age: 40
Riding Since: 4

I had the same issue with another well known shops porting. mine ran great for the first 50-100 miles then would start falling off 400-500 miles max. Pistons look identical to yours. I was told it was from lack of lubrication even though I had extra oil in the gas along with the controller adding extra oil also.
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