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« on: July 22, 2011, 11:09:28 PM »
I just had them changed out at the shop on my 3000 mile service. Now have the first 40 miles on them.
0-60 MPH times with my 240 LBS before was about 10.5 to 11 seconds. Now I just tried it twice and I am 8.0 to 8.5 seconds. Acceleration now is at 6,500 RPM at WOT, before about 6,000. so the advertised performance is definately there. You can definately feel it in the seat of the pants.
Top speed for my short runs has not changed. 92 MPH indicated but instead of 8,200 RPM it was at 7800-7900 RPM but still felt like it could have climbed higher but I ran out of space. It did feel stronger accelerating from 60-92 indicated but too short a run and too much traffic for this chicken little.
Casual riding will take getting used too. Take off is smoother as slightly lower geared but at the same time low speed RPMs are up a bit. 35 MPH steady is now 4,300 RPM where 4,100 would do before. 40 MPH is 4,500 RPM and 4,300 would do before. 50 MPH is 5,000 the same as it would do before. Now at 55 mph and above the RPM's lower. at 60 I do 5,400 RPM where 5,500 before and 70 is now 6,200 where 6,400 to 6,500 before.
Another note is RPM variation under any acceleration is higher. The bike lets the engine run more freely under 55 MPH so when you give it some of the twist the RPM's climb much higher but you feel more juice under you and the engine does not sound as labored. That is unless you are WOT, then you can hear and feel the higher RPM at full juice.
About the best way to describe it is before the bike was lugging it as much of the time it could. Now the bike sounds more normal like it is not lugging. I am sure though this will affect MPG though. The first tank will be a killer as I have the WOT's etc..
So the jury is out still as I kind of liked it as a lugger. The engine load is quiter now though but I really don't need the extra umph that it provides. So we will see as time progresses. If I do change though DR pulley 20x12 16 gram would be the choice as that should put lower speed RPM's back where they were but still give me the lower RPM than stock at 70 MPH...............
Edit; I should note for those not familiar that the torque curve is rated tops at 6,500 RPM and top HP at 8,500 so as it stands the rollers seem to put the engine at its most efficient RPM values for torque. This again will eat into MPG but you really can feel the difference and the sound with the stock muffler can definately be heard as the engine just doesn't have that straining sound like it is in too tall a gear.
Of course it really feels weird at first. Maybe if I hadn't put the 3,177 miles on the bike before changing it would have felt normal. Also having ridden much larger bikes for so long I am not used to bikes with small displacement engines that require the extra RPMs to be in the pipe range.