Power band

One thing of which Nigel has made me aware, is the similarity between Triumph E3134 race cams and the standard 850 Commando cam. I have never ridden a near standard 850 Commando, so I don't know their characteristics. If you wind the throttle on slowly in a high gear, is there a surge of power as the cam starts working properly at about 3000 to 4000 rpm ?

acotrel said:

One thing of which Nigel has made me aware, is the similarity between Triumph E3134 race cams and the standard 850 Commando cam. I have never ridden a near standard 850 Commando, so I don't know their characteristics. If you wind the throttle on slowly in a high gear, is there a surge of power as the cam starts working properly at about 3000 to 4000 rpm ?

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The stock 850 has a nice wide power band. I can lug along at 35-40 mph in top gear and still have good throttle response (20 tooth sprocket). It comes on the cam around 4000 so with this gearing cruising at 65 mph on the highway is ideal. Twist the throttle for passing and just go. My buddy's combat Interstate is unhappy below 4000 and he finds he's using 3rd gear a lot around town. A small sample of experiences, obviously - it's the proverbial YMMV sort of thing.

Thanks for that. It is what I expected would happen. With the 2 into 1 exhaust, I never notice the surge when the cam cuts in. It makes it easy to be very smooth in tight corners. - Makes me wonder about those 2 into 1 exhaust systems which use large diameter header pipes.