Yamaha gpr 2 stroke speed database

[Vifferrider]

First Every run - 15-20 mph crosswind , fresh water lake, 1 x ft b@stard of a driver (225 lb) , chop on the water of approx 9 inches

GP1200R 2001

Only mods are
D Plate
Waverider Clips and Couplers
PreMix

a Paltry 61.5 GPS

[riick370]

2006 GP1300r. I'm 6'2 200lb.

Extensive hull/pump mods. Bone stock engine with 110 hours, just a d-plate.

69.0 today on the Garmin. Not touching the motor until I stop getting speed out of the hull. I'm pretty sure when all said and done it will settle in the 71-72 mph mark. Then I'll start doing motor work.

[[email protected]]

My ski has been Down for a while now. Am getting carbs rebuild and jetted,adding flame Arrestors, free flow, and reed stuffers, already had D-plate and chip installed years ago.
It's a 2000 GP1200R with about 40 something hours on it.


What am looking to expect from Ski?
If everything works out fine, then am going for intake grate, pump seal, and 13/19 prop

[riick370]

My ski has been Down for a while now. Am getting carbs rebuild and jetted,adding flame Arrestors, free flow, and reed stuffers, already had D-plate and chip installed years ago.
It's a 2000 GP1200R with about 40 something hours on it.


What am looking to expect from Ski?
If everything works out fine, then am going for intake grate, pump seal, and 13/19 prop

Free Flow exhaust will slow it down on the top end, I wouldn't expect better than 62 on the GPS.

[cmgww]

Got a special pitched 15/22 prop from Impros that should push my ski near 80 or close..I will update with GPS results.

[riick370]

You should be doing 85 with that motor!!!

[cmgww]

You should be doing 85 with that motor!!!

Maybe not 85...but 80 or 81 given the right conditions. To hit 85 I would need race gas compression, or triples...or bored out to 1490 which requires new sleeves. Lowell (who sold me the motor) told me that I could do 80...so I'll still shoot for that. Single pipe GPRs hitting above 80 are pretty rare. There are a few on here but they've got a ton of work done, even more than mine.

Another thing on hulls. My ski, when engine stock, did 65 mph. The mods were: pump seal kit, 13/19 prop, R&D top loader intake grate, and a Jims ride plate.
My brother bought a 2001 GPR and had similar mods, only he had the heads cut to increase compression. He got 71 MPH. Virtually the same ski except his head mod, and he did over 70.

There is something to be said about hulls. I've checked mine and its fine, but I guess it isn't as good as my brother's old ski.

But out there variables exist. Humidity, water temp, etc. My best run ever was 77.8mph in the spring (cool temps, cold water).

[riick370]

You should be doing 85 with that motor!!!

Maybe not 85...but 80 or 81 given the right conditions. To hit 85 I would need race gas compression, or triples...or bored out to 1490 which requires new sleeves. Lowell (who sold me the motor) told me that I could do 80...so I'll still shoot for that. Single pipe GPRs hitting above 80 are pretty rare. There are a few on here but they've got a ton of work done, even more than mine.

Another thing on hulls. My ski, when engine stock, did 65 mph. The mods were: pump seal kit, 13/19 prop, R&D top loader intake grate, and a Jims ride plate.
My brother bought a 2001 GPR and had similar mods, only he had the heads cut to increase compression. He got 71 MPH. Virtually the same ski except his head mod, and he did over 70.

There is something to be said about hulls. I've checked mine and its fine, but I guess it isn't as good as my brother's old ski.

But out there variables exist. Humidity, water temp, etc. My best run ever was 77.8mph in the spring (cool temps, cold water).

Both your hulls are way out of tune. I'm doing 69mph and will be hitting 70 with nothing but a d-plate, ride plate, pump seal, 14/20, pump wedge, intake grate with a 110hr motor. I say will be, cause my throttle cable broke and waiting for repair. My goal is 71 and I think she can do it with some more plate tuning.

Time to tune the hull!!

[785pro]

I just bought two GPR 1390cc triple pipe ski's, one is a '06 Kerry built ski "007". Has been sitting in a shop for 2 years and first trip out ran a 87.5 mph pass. Needless to say I was very impressed!!....other ski is a '00 triple stage 3 riva runs 84 mph still tuning....I own a 2012 rxp, but I have to say there's something about these triple pipe 2-stokes....I find myself riding them more than my rxp.

[superjetpilot]

Wow that is fast. I need to get my 2000 GP 1200 R running after what you said. I also have a 2014 RXP – X. Although the GP 1200 R is stock I hope it's as exciting as the one you just went 87 mph on LOL.

[785pro]

I will say The guy that owned it before me put a lot of money and time into the ski, kerry performance does wonders with these things. I have had GPR's for many years, but this thing is fast. Before I bought it the guy told me it would run close to 90mph I took it with a grain of salt. But as soon as I got in the water I knew it was different than any two-stroke id ever rode.....Think about it, how much money would it take to make a four stroke do that??

[superjetpilot]

The bolt on record for an RXP-X was about 85mph with the stock charger on greenhulk.

With a BIG SC upgrade I would think 90+mph should be capable.

[785pro]

That's fast for bolt on stuff, I do like my rxp but I have less than $6k total in my gpr that ran 87mph...that's hard to beat.

[superjetpilot]

Is that including the GPR? If so, that is amazing!

[785pro]

Yea, remember I bought it from someone else who put a lot of time and money in this ski. I got lucky.