SOHC.co.uk Forums > CB500/550

Inlet port matching

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DomP:
The inlets on my cb550 are pretty poorly matched, is there much to be gained in tidying these up or am I wasting my time?

Johnny4428:
Not going to hurt Dom but maybe not much to be gained if a good vacuum sync is done. Better knowledge than mine on here though!

DomP:
You're probably right, not nearly as important as a good setup but I can't help myself meddling with things

McCabe-Thiele (Ted):
TBH I like such things to at least line up Dom - good gas flow especially on inlets strikes me as just good engineering practice.

Oddjob:
According to Mark Paris, port matching and trimming the vac screw will give your a small HP increase. If it's matched with a small port alteration as well, by making a small pocket above the port and exposing the valve stem more, that will give up to a 5 BHP increase. TBH I think it's just how brave are you to try it, the results have supposedly been proven in racing engines.

I'll be doing the port matching Dom, it's easy to do and who knows, it may work very well indeed. I've already trimmed the inlet vac screws.

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