03-29-2010, 09:48 AM #1
Can anyone help me to choose my prop?
Hi! A good friend of mine has a 2004 GPR1300R with the folowing mods:
GP1300R Performance Cylinder Head Kit (45cc)
RIVA Girdled Head Hardware Kit
RIVA GP1300R Power Filter Flame Arrestor
RIVA Pro-Series E.F.I. Control Unit
RIVA GPR Performance Ride Plate
RIVA GPR Performance Trim Tabs
RIVA GP1300R Cat Removal D-plate
RIVA GP1300R Free Flow Exhaust Kit
GPR Black Mat Kit
RIVA GPR Pump Seal Kit
RIVA GP1200R/1300R Top-Loader Intake Grate
Right now it has a 13/19 prop, but when we mounted all these performance parts, it just lost a lot of top speed. We don't know what RPMs it's making, because we don't have a tiny tach, but i'm guessing this 13/19 is way too short. The PWC puls very very strong in mid range, but has no top end...
Is the 14/20 the way to go?
03-29-2010, 10:52 AM #2
03-29-2010, 12:52 PM #3
03-29-2010, 02:45 PM #4
03-29-2010, 04:43 PM #5
03-30-2010, 08:50 AM #6
IMO, with those mods (which are very very close to a stage 2) I'd recommend the 14/20 and remove the airbox screens. If the OP is cavitating alot down low/spinning too much out of the hole, tha'd be another clue in justifying the taller 14/20. Hey, you've got the higher compression head...go for it!
Plus you can always switch them out if say you want more bottom end bite for wave jumping....
03-30-2010, 12:39 PM #7
Riva pro series EFI is at 7-6-1-6.
It also has a Riva Nozle, no air mods (he does a lot of wave jumping), no tunnel reinforcement, OEM head gasket...
This weekend i'm going to check out the ride plate and the trim tabs, to see if they are hanging down...
Thank you all for your help
03-30-2010, 12:46 PM #8
you won't push a 14/20 without intake mods (the free flow does nothing if you don't have more air coming into it)
go with the 13/19
VF3's and the 14/20
03-30-2010, 12:56 PM #9
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