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600\660 issue

Greasemonkey

Greasemonkey

New Member
Messages
13
Age
46
Location
New York
Country
USA
Years Snowmobiling
20
Snowmobile
2016 Polaris Switchback 800
Lost a engine in 2016 switchback 600 w\2500 miles. PTO rod bearing failed. Unsure why, all oil lines ok. Got a good deal on 660 big bore and did the swap. Engine runs great but I hear a pop from the exhaust at idle, ok above idle speed (1600 rpm). I checked and adjusted TPS to spec using PCV for voltage value. Any thoughts. Idle fuel mapping is stock, plugs look good besides a little rich due to 50:1 oil mixture.
 
I would say that 660 needs 10% more fuel throughout. Based on old 660 carb needs. Just a quess.
 
20180223_202738.jpg
 
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