Checking Bore Rotax 717

[jwill19028]

Good Afternoon,

I’m trying to replace a cracked cylinder jug on a Rotax 717 and was wondering how I check if my engine has been bored out so I can get the right cylinder jug. I checked diameter with some digital calipers and got 82.5 mm. I’m wondering if this is the right way, or if it should be stamped somewhere on the engine.

Thanks!

 

[etemplet]

Digital Calipers will work just fine for what you are doing. I doubt you'll find a used cylinder that is "on-size" for your needs. I'd do a complete top end if I was that far down but I'm an old two-stroke guy. Good Luck !