Benelli 750 sei

[Lotus54]

I’ve been mucking about with the sei a bit.
Engine turns over well- after some wire cleanup, it has great spark. Low compression in #6, oil brings it right up. Could be stuck rings, broken rings or just worn out. Or maybe a bit of all.

I’m trying to ascertain what sorts of things I’ll need- if engine needs overhaul or what (likely). I believe it has sat since the 90’s.

[John H]

Sounds like an interesting project. Probably not many sources for parts or info out there.
I would just take the gentle approach. As for low compression, there are many thoughts starting with soaks of a mixture of atf / acetone. I personally like Kroil either for soaking or aerosol for places you can't soak.

[Lotus54]

Yes, I’ve been giving it the Kroil treatment.
Almost certainly I’ll tear it apart.
Parts are not bad for a lot of things. Cosmopolitan Motors here in the States had a huge supply, but so,d to an outfit in Germany a number of years ago. Makes it more another layer and cost...

I have new 6-6 pipes, those were not cheap.

[John H]

I'd sure enjoy a show & tell if you would care to do one. I know it's a PIA resizing images to 257 or less. It's not to difficult with Macs but a couple of guys with MS said they had trouble getting it done.

[Lotus54]

As you can see- it is rough. But I think it won’t be too bad to bring back to a good rider.
I already have proper 6-6 pipes, seat cover, fenders, tyres, handlebars and many others.
I have a 900 sei small fairing I plan on using (the one in the pics is up for grabs if anyone wants it).

[John H]

The bike has lots of potential. Like to see it when it's done.

[Lotus54]

Popped the engine out today. The cherry picker/balancer made it pretty easy. I couldn’t fit the legs of the cherry picker under the lift- so had to move it back on the ground.

[Lotus54]

popped off the head and cylinder today.

[John H]

Did you find any stuck rings?

[Lotus54]

Yes, #6 (the one with low compression) had the top two rings stuck.