I have a 81 type 454 440 rotax motor the thing runs strong then doesnt rev sometimes i cant start even when it has good spark.I put oil down the cylinders after pulling it for a while then it started but didnt rev or run right.After sitting for a few months i go out the thing starts right up runs great stopped and started several times no problem seems to have decent compression any ideas?
hi when you started the sled ,did it idle alright or seem a little high and if so that is a sign that the crankshaft seals may be leaking.Spray some quick start or even brake cleaner around the crankcase and the seal on the clutch side.
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