ski doo rotax ???

[prozilla]

i just picked up 2 sleds, a 91 and a 94. both were sed to have 670's . how can i identify the engines? i cant find anything on them. also they both seem to be rich, the 91 bogs until the rpm's pickup and the 94 keeps fouling plugs. any advise there would be helpful too. thanks in advance.

[brad ellington]

there is a tag down by the starter on top of the case i dont know if the 91 is a 670 the 94 would be i have a 93 m1 that has a 670 with a black head

[prozilla]

yeah i found the tag on the 94, its a 670 for sure. of course the tag is missing on the 91. measured the jug height and the 670 jug is about 5-3/4 tall the 91 motor is 5-3/8 tall. i suspect it a 583 or 617. deffinately need to find out for sure though.