The bike didn't feel right started running on one lung close to home. So I parked it, tried not to think about and rode my other bike. Started it today. It didn't want to fire but I got it going. Rear jug has lost compression and it sounds like a rod or a part of the piston is slapping around inside.
So now I need to start saving my pennies and figure out what the next "best" move is going to be.
Current motor: 1991 stock 80" evo with about 80k miles

 

Maybe dropped a valve? Anyone that actually wrenches on their own bike or has more info is welcome to chime in here. I have done all my own work on the bike and have rebuilt and painted everything but engine internals. Dealer mech's aren't gonna touch my bike unless someone else is picking up the tab.
Trying to decide if I should look into a rebuild or a crate motor. Getting rid of or parting out the bike isn't really an option but a new motor is about equal to bluebook if it was working properly. Also I don't need to get in pissing matches over who's got more inches or HP. 80" has been enough until now. A little more would be fine but I don't need to get stupid about it

 

Pull the rear lung and take a look.

 

Post in the Evo section for more help.

It is very premature to start talking about a replacement engine, especially since not one bolt has been loosened to figure out what is wrong.

Quick compression test might tell you something. If it is as bad as you make it sound, start tearing it to have a look, since disassembly will not cost anything.

It's an Evo, which means it is infinitely rebuildable. Don't give up on it just yet.

Carbureted Evo's are so simple that there is no reason to bring it to the dealer. You can do it yourself. If time is an issue, an independent shop can provide an estimate and do the work.

Alternatively, I bet someone in the Evo section would buy it from you as is.

 

That's on the list of to do's. Not able to strip the bike down at this very moment. This will end up being a winter project. Just trying to wrap my head around what to do after I pull it out of the frame.

 

Thanks Prot.

 

I don't think I would pull it out the frame. The three tiered rocker boxes were designed to allow work on the engine with it in place. Pull the rocker boxes then the head. They come off so quickly and easy plus you will know right away what is wrong.

 

i agree, with 80,000 miles you need to freshen up the top end anyway. pull the heads and jugs and have a look. how many sets of lifters have you puy in it over the years ? i've heard bad rollers on lifters sound like it's coming apart. do a compression check first.