Thread: What does this mean?
08-10-2006, 01:39 PM #1
- Join Date
- Jul 2006
What does this mean?
Taken from R&Ds website---The new 2005 Yamaha GP 1300R’s engine platform is significantly different over previous 2003/2004 models. Yamaha’s new engine platform does not have the electronic Y.P.V.S. (Yamaha Power Valve System), and Yamaha has redesigned the exhaust system to a new lower RPM based design to offset the loss of the power valves! Also new for 2005 is the new larger hub 6 vein pump, which smoothes out acceleration and overall power delivery. The new pump design also has better overall pump efficiency and produces higher peak speeds at lower RPM’s.
Does this mean with an 05 I shouldnt be looking to turn the same rpms as the rest of the gprs since the exhaust and pump are both designed for lower rpms?
08-10-2006, 01:50 PM #2
08-10-2006, 02:11 PM #3
I thought the new 05 pump conversion gives you about 100 to 200 rpm's more on top end.But i could be wrong.My 2 cents.
08-10-2006, 02:34 PM #4
If so I will be one HAPPY camper.
I am expecting a 100-200 rpm drop with the 2005 pump and 14/20 on a stock setup. But now I am by far not stock.... so who knows what the loss would have been.
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