I currently drive a pre evo junior rotax engine and am thinking of getting the evo upgrade kit and evo barrel.I have got the figures but can’t find the cost of a rebuild(UK).
Cost of a rebuild will vary from builder to builder. Call around to some local authorized dealers and see what you can find
Rotax is running a trade-in promotion right now, I am fairly certain you could get a new motor with the trade-in deal for cheaper than the cost of parts and labor to upgrade your existing motor. I would email JAG about it and see what they say.