Anyone have a Honda CB750 engine for sale?

[86FJNJ]

Please delete if this is not allowed since it's not FJ related....but...

Anyone happen to have a CB750 engine for sale?

I have a 1978 CB750F Super Sport, bottom end is blown so wondering if I can source a replacement engine and turn into a cafe racer. If I can't source an engine then I'll just have to part it out, which would be unfortunate.

I figured I would try this group before venturing into the honda forum world, I'd rather deal with the FJ people!

[T Legg]

The engine in 77 and 78 cb750f bikes are different than the earlier engines. You can install an earlier engine in your frame but the primary sprocket is 10 mm further out board than the earlier models. You could swap the sprocket carrier in your rear wheel to one from an earlier cb that would have the correct off set to match an older engine off set. they also make offset primary sprockets to fit to the older style engine but the sprocket cover needs to be changed to the one off your 78 engine  to allow room for the offset sprocket .
 the heads on the f models have larger valves and the compression ratio is higher than the cb750k. The engine was supposed to have a little more horsepower than the k models but the strongest engines in my opinion were the  K0 and K1 versions.The cheapest way to get a used motor is to find someones abandoned project bike.
 The engine in one of my 71 K1 cb's developed a bad knock a couple months ago. I found another 71 cb750 bike that a previous owner was trying to install the front forks from a late model cb750f with dual disc brakes but never finished and had no title. I paid 500 dollars for it so I can use the engine.It also had a set of hm300 exhaust pipes with silencer baffles and vintage koni rear shocks as well as a perfect rear fender, brake lights and blinkers . I pulled the engine on monday and hope to have it in my bike in the next couple weeks.

[86FJNJ]

TLegg, thanks for the info! Noted on the 78 and earlier SOHC. If I can find a 76 or earlier I'll deal with the offset but good to know. Would be a shame to part it out completely, I do plan to sell much of the parts from it to convert to cafe, I'll hold it for a while and see if I can source an engine for cheap locally. I made the mistake of learning the late model GSXR USD forks fit on the CB's with the use of an adapter neck so doing a GSXR front end and wheels is stuck in my brain now!

[Waiex191]

South of Grand Rapids, MI:
https://holland.craigslist.org/mpo/d/pullman-1970-cb750-engine/7880764464.html

[T Legg]

If you check that engine out be sure to bring your kickstart and shift lever  to ensure it turns over and shifts and a flashlight to look inside the exhaust and intake ports. You can also pull the valve tappet adjuster caps to see into the top end and the oil filter to see what kind of crap is in the filter.

[86FJNJ]

Thanks all! I actually just brought home a donor bike from out of state a couple hours away, no title but engine goes into gear and kicks over seems promising so I'll be working on that over winter along with some basic maintenance with my FJ. Thanks for everyone's help! I did joint a CB750 forum so I don't bother you with all my CB questions