Quote:
Originally Posted by MeatHammer
I have read that the Hotcam is a drop in and requires no mods to the engine. What kind of performance gains could you expect by only swapping cams and not doing the port/polish and piston swap?
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I wouldn't bother with a cam install without at least doing some work to the exhaust port. These heads, both CB and CG 2 valve engines, have pretty terrible exhaust ports. Putting a more aggressive cam without doing at least some port work would be like running a marathon race but only breathing through a straw while doing it.
Honestly, even if I weren't installing a cam, or raising compression on any engine these bikes run, I would still open up the exhaust port, as well as port match and smooth out the intake a little.
If you don't believe you are capable of doing your own head porting there is actually a shop in Missouri that will do pretty damn good port work for a pretty good price (Around $150-200). This is their facebook page.
https://www.facebook.com/LFRPowersport/
You can see some of their porting examples. Corey Lansdown is who I talked to and he is a knowledgeable guy that does good work. Get in touch with them and see what they tell you.
As far as increasing the compression goes. Given the specs of the cam in question, I would want no less than a 9.5:1 static compression ratio to avoid losing low end power. Mid range and top end would perform just fine. It might not be quite the fire breather that Jerry is making, but it will have most of the benefits of the cam while also running cooler.
I am not 100% sure what the X22R CB engine has stock, but usually the OHC motors are around 9:1 compression. So, at the very least you could have the head decked 2 thousands (.002 inches, or .5mm) to bump it up to about where you would want it.