Honda CB77- Risks of oil overfilling

[G-Man]

Tim

Yes his stuff looks very interesting and well made. I have just picked a 500cc "development" motor based on a C72 crankcase and CB500T crank. Lots of work has been done but I think I shall need a Cappelini pump when it runs.

G

[Vince Lupo]

Hi G,
Franco Cappellini has done some testing and even the stock pump with oil at top mark sucks some air even at moderate speeds and he recomeneds running 3/16" above the top mark. Or better yet get one of his trick oil pump kits with a rubber packing to pervent air from getting sucked in from the top. I have inspected most all of his cb72 parts and there all excellent. I'm currently testing a stock cl72 with his #100 filter unit on my test stand with good results.

Tim

Tim, do you think that the #100 filter conversion kit will work fine with the stock pump? My mechanic has been trying to get me to buy the kit for my SuperHawk (it has the 350 kit and the NOVA 5 speed), but I don't want to also have to spend another $400 on their uprated pump. Just wondering if it's better to just leave well enough alone and stick with the stock centrifugal filter.

[Tim Miller]

Hi G,
Franco Cappellini has done some testing and even the stock pump with oil at top mark sucks some air even at moderate speeds and he recomeneds running 3/16" above the top mark. Or better yet get one of his trick oil pump kits with a rubber packing to pervent air from getting sucked in from the top. I have inspected most all of his cb72 parts and there all excellent. I'm currently testing a stock cl72 with his #100 filter unit on my test stand with good results.

Tim

Tim, do you think that the #100 filter conversion kit will work fine with the stock pump? My mechanic has been trying to get me to buy the kit for my SuperHawk (it has the 350 kit and the NOVA 5 speed), but I don't want to also have to spend another $400 on their uprated pump. Just wondering if it's better to just leave well enough alone and stick with the stock centrifugal filter.

Vince, If your pump is in good condition ? then I do think it's a great upgrade. I was also suspicious until I tried it myself. I installed a nice used stock pump with proper clearances. I attached a clear hose with a inline oil pressure gauge form the main oil galley at the front of cylinder to left side cam cover. I can visuslly see good volume with very little if any air. I am running oil level 3/16" over top mark. I still have more testing to do with stock sliinger but I have witnessed a bit more air in the oil line using it. If you send me your email address can send a short video.

Tim