This is the exact engine for the new ISR 120 semi-pro and pro class. It is a sealed Briggs engine with a 6100 RPM rev limiter and is used with a spec pipe. This engine is not designed to be altered in any way for this classs except for the removal of the fuel pump and fuel pump mounting plate which will allow the engine to fit all 4 sled makes.
NOTE : This engine will mount directly into a Yamaha SRX120, Arctic Cat 120, and Skidoo Mini Z or Mini Rev, but you will need to purchase adapters to fit it into a Polaris XC/XCR/EDGE 120.
NOTE : WE DO NOT RECOMMEND THIS ENGINE FOR A GENERAL PLAY RIDING APPLICATION DUE TO THE REV LIMITER.