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Having just bought a '78 CX500 I was wondering what kind of performance improvements are made matching gaskets and porting or chamber or intake tracts on the CX500. Anyone had experience in this area?

Any camshafts for better performance out there?

Web Cams Inc has support for SOHC and some DOHC models but none for the CX-500.

49hp from an OHV model isn't too bad. The CB550K was around the same numbers for SOHC/4 cylinder design.



The CB550K has quite a bit of untapped potential in the intake and head and exhaust tracts. Is the same true of the CX500?



David
 

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Hi David, this question does come up a lot, but unfortunately, no after market "go fast" bits were ever made. Pistons can be made, camshafts too, but a lot of effort and dollars for little return. Port matching the heads will help a little, and Jim L has a world record for his CX/GL salt flats bike, but that was heavily engineered.



In short, you may need a bigger bike..



Dont let me put you off, get a free flowing exhaust, up-size your jets to around 90/120, and port match. You may find a few horses, but not much.



CB 750 models were so popular with chopper builders that they make an 810cc kit for them, I think?? But jack sh!t for the humble twisted twin. Hope this helps.
 

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It would be pretty cool if there were more aftermarket stuff for these engines. With the 750's its easy, pull the jugs and pistons off the rods and swap it. These are more like cars and require actual machine work to alter bore size. The last v twin bike I had was an old 1968 harley sportser that I built. Raked it a little, ran drag pipes and a good S&S carb. That engine was 900cc and rated at 55hp, I thought it felt pretty quick. This is rated at about 50hp I think, spins alot faster though. Port matching, pod filters, opened up exhaust, and correct jetting would probably turn her into a beast. Cant wait to finish mine and ride it.



If your really interested in trying some engine performance mods check out the website bisimoto.com This guy is a genious with f22 accord engines. I have a 76 GL1000 I built, said if I sent him a head to play with he could come up with cam grinds and porting, its still a honda engine
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