You will be fine. Make sure your mikuni rebuild kit is a real Mikuni brand kit and not some china knock off. Or you will be fighting issues next season. Post a picture of the engine bay and people here will let you know what you have.
I would ride it the rest of the year then bore the cylinders 1 over with new pro-x pistons. If you want a little more power it would be worth having it ported too. Would also upgrade the carb and intake to a mikuni sbn 44 carb. Impeller is probably pretty beat after 40 years too. Would upgrade...
Need to add at least one mod a year to stay current.
Ordered some frog skinz for the SJ and they sent me a sample piece. So far so good after a few days riding surf.
Ones I have pulled apart have grease all over the spring in the cover and in the brass bushing by the starter. I keep mine lubed. Not sure that's your issue though.
Talking to a few people running stock 1100's in these hulls they are running low 60's. Few mods like the dry pipe and zeel should make it rip.
Anyone else notice the sparkplugs/coils. (normally the coils are inside the ebox)
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