Yamaha gpr 2 stroke speed database

[WATER WOODY]

There sure is alot of WC Ported ski's on this list... Wish I still had my 1300... I know there was more in it.. Almost 80 on a lil old 1300 with a 1200 grate doesnt suck..

[Gus13letter]

2006 gpr 76 mph Non ported

76 MPH has been my top speed so far and backed it up with a 75.9 MPH with 1/3 tank gas. Great holeshot and all around performance. Setup for holeshot and handling.

List of mods:
2006 GP1300R
Coco tunnel reinforcement
Stock air box gutted and stock air intake removed
Head milled by Jim
VFIII Reed setup
3* keyway
Oil block off
D plate and opened up by Jim
Riva freeflow exhaust
Riva EFI controler
Dynafly 14/20 pitched and worked by Jim
R&D Plate modified by Jim
Riva pump shoe plug kit
Riva 1200 grate
Leo's wedge
Hull/seat modified for more airflow
Pump shoe and trim tab holes filled

[cmgww]

75.16 on at only 6700 RPM....need to prop down! (1390) This boat has 80 with the right setup...just need to keep fine tuning. It really is the little things

[OzarkYamMonster]

I noticed several guys made use of a 3 or 4 degree keyway to advance their timing. Is there a downside to this ? I heard that you change your ski so as not to beable to continue use as a rec-ski .... is this the case?

[WFO]

I noticed several guys made use of a 3 or 4 degree keyway to advance their timing. Is there a downside to this ? I heard that you change your ski so as not to beable to continue use as a rec-ski .... is this the case?

no down side... we are all running keyways on EFI skis

most applications require super unleaded and fuel controller

[cmgww]

77.5, new Jims plate since last season, reworked 16/22 prop...still pulls like a mofo from 20.

[Yukon_Inferno]

78.0 on Etrex- added a second fuel pump and jetted the carbs up, possibly opened Pandora's box over the winter?? Not yet dialed in, but pretty happy with it so far .

[VdeKock]

I ran 74mph today.... Finally
Most speed mods are in my sig. Single pipe non ported (yet )

[tmg97gp]

Yamaha gpr 2 stroke speed database

75.7 this summer on my single pipe unported GPR1200

[cmgww]

77.6 on Garmin, perfect conditions....Too fat on the carbs..plus the prop is still a bit too steep...
The mad scientist (LT1GMC) will help me hit 80+

[superjetpilot]

Nice! What are your mods?

I was wondering what a stock 1200cc engine and original carb can do.

[cmgww]

Nice! What are your mods?


I was wondering what a stock 1200cc engine and original carb can do.

I am modded to the hilt.
1390 big bore top end, ported by Lowell, installed by LT1GMC. Head is modded to 155 (I think?) psi, 93 Octane
RIVA gas power valves
2nd fuel pump to prevent leaning out
155 carb jetting
16/22 Solas prop, tweaked by Impros (can't remember setback right now)
R&D 1200 Grate
catalytic converter removed, D plate installed
Jim's rideplate, both plate and tabs shimmed for choppy water.
pump/tunnel reinforcement
rear seat cutouts for better ventilation
cut front plastic under silver hood, again for ventilation
SHO steering nozzle, trued to perfect circle


So, basically everything but race gas, triple pipes, and a few other small things.
I didn't get much lake time last summer (moved to a new house) so I didn't tach it, but I think it needs to be jetted down bit...I think I can still get 80 with the mods I have.

As for a stock 1200, you can easily get 65+ with a few minor mods. An aftermarket intake grate is a must. A 13/19 Solas prop was what I had on mine when it was "motor" stock, and it ran 65 and hung with the big boys at the time, in 2010. Just look at the stickys at the top for more info. There are tons of tricks to get more speed without blowing the budget. I spun a ring and ruined the entire top and bottom end, so I went all out on the rebuild.

[cmgww]

77.7 on Garmin...ideal conditions. Still need to tach it and see where the prop is. Didn't get to last year bc we weren't at the lake much.

[OzarkYamMonster]

That is impressive !

[Reaper9789]

I got 72 on gps on my stock 2000 1200r.. it was on the trailer though lol.. does 61.5 seems low for a stock gpr? I weigh 230lbs and no superman.
Fixing to send my carbs to WFO for some jets and mods. Probably go with flame arrestors.. I think the impeller needs replacing.. I will get some pics and see what you guys think.