Cams are the answer

[rock-nken]

I have 31,000 on my rocket. K&N's exhaust and tuneboy. To keep the bike from trying to jump off the road in a low speed corner because of touchy throttle. I had to use the tune that retards low throttle timing. This affects my mileage 37 to 32. If there were hotter cams, that would weaken the bottom end and strengthen the top end. The over lap in the lower rpms would have an egr effect increasing millage. This should lower the engine temp. in normal riding also. Sure wish someone would come up with this before I have to do it my self.

Increasing the compression on the piston would offer the best mileage and power increase but much more heat would happen. With heat comes nox gas. That is probably why triumph had to go with lower compression.

The right cams should fix the jumpy low speed power, lower emissions and heat, and improve mileage.

Are you listening Triumph? Got anything to say?

[Pig9r]

Get a dyno tune or find a better tuneboy tune. Sounds like your tune is too rich at small throttle openings.

[Barak]

Greater overlap would increase hydrocarbon emissions significantly, so emissions may actually be worse; and considering that in California manufacturers have to meet a NOx+NMHC composite fleet average, that may be a trade-off that Triumph cannot afford. Mileage would certainly suffer as well due to the lower dynamic compression. The internal EGR effect would also be minimal unless the cams were seriously radical, but that would result in the engine making peak power at very high RPM and a decent idle only achieved above a grand; even if you find those trade-offs acceptable, the engine would be unreliable due to piston speed.

"Variable cam timing is the answer" would have been a better title, but then again if you don't like instant torque and desire better mileage, then perhaps a 2.3L motorcycle just isn't right for you.