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Author Topic: Another GT250 Racer Build  (Read 2367 times)

old man

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Another GT250 Racer Build
« on: March 13, 2014, 03:40:15 PM »

Well we are going to try again building a GT250R Superbike. I built one last year and raced it once. Needed a lot done to keep up with the Ninja 250 and 300's. Heavy, suspension, power all needed to be worked on. So I sold it. The new build is ground up. We have a couple of local clubs that are racing 250's. Rules are pretty loose. So...

I have a 2010 motor which will go into a FZR400 alloy frame, using all FZR suspension mods, Ohlins rear shock and forks have all Race Tech insides. Fits nice. I will have to mod the air box and tank. Was going to use Suzuki FXR150 pistons to make it a 300 but just not enough meat on the cylinder liners to do so. Should be well under 300lbs when done. And will handle .

I don't know how to post pictures so I will try to put them somewhere so people could see what is going on.

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Superhyo

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Re: Another GT250 Racer Build
« Reply #1 on: March 13, 2014, 08:44:24 PM »

I'm glad to see that someone is doing what I am doing. Good luck on your build. As far as the use of FXR150 pistons are concerned………did you look at the cylinders themselves? As I have a set Im looking at right now and was really wondering if they would fit, despite the abundance of confirmation from people from Malaysia and India whom said that they fit with just a rebore. It also says that they fit from a prior thread http://korider.com/index.php?topic=12115.20
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old man

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Re: Another GT250 Racer Build
« Reply #2 on: March 17, 2014, 01:28:46 AM »

Looks like the FXR150 pistons would need a different sleeve so I may pass on that right now. Got the frame and am building mounts right now. Air box and tank are going to be a little work so all that first. I did pick up a Power Commander to work with also. Been talking to exhaust builders, I will do the porting. Work begins. With the weight lower I may not have to do that much to the motor. Does anyone know if the GT650 has larger throttle bodies ?
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umop-ǝpisdn

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Re: Another GT250 Racer Build
« Reply #3 on: March 17, 2014, 09:49:58 AM »

G'day oldman,

Just measured a set I have on the shelf. 42mm inside diameter.



Cheers,

DBM
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umop-ǝpisdn

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Re: Another GT250 Racer Build
« Reply #4 on: March 27, 2014, 10:57:36 AM »

Hey oldman,

How's it coming along?

DBM
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old man

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Re: Another GT250 Racer Build
« Reply #5 on: March 31, 2014, 02:48:11 PM »

Building is slow. Had to finish a couple other track bikes so I would have something to ride. Got the motor in the frame, gathering up parts, got a special GT250 valve spring compressor on its way to remove the valves to do some porting, got stock pistons on the way. Got to start working on the tank to fit. It just looks cool with the motor in the frame . I will try to figure out how to attach pictures today.
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old man

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Re: Another GT250 Racer Build
« Reply #6 on: May 14, 2014, 12:58:24 AM »

Bought another 2010 which will now make everything faster and quicker. I hope to have the stock framed GT on the track next month. The superbike GT maybe another month.
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old man

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Re: Another GT250 Racer Build/ Weight
« Reply #7 on: May 25, 2014, 09:55:38 PM »

Not sure if anyone cares. Bike is getting closer. Installed in frame, wheels, forks brakes race glass are mounted. Without oil cooler, exhaust, bars, and air box the weight is 255lbs. With the other stuff installed it still will be under 285lbs. Fairing is 1988 FZR400 race glass which looks pretty ugly, so I will work on that and see what I can come up with. It now has Linderman revalved FZR400 forks, Power Commander which I will have to have Dyno tuned to get it setup right, I am getting a Full Arrow Race exhaust system. Only full system I could find. It also will have a Ohlins rear shock, 1 gallon custom fuel tank. Custom rear sets. I also will be sending off the disc to have lightened. So it could be well under my 285lb goal.

More later.
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Cloud

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Re: Another GT250 Racer Build
« Reply #8 on: May 25, 2014, 10:14:20 PM »

This is the only topic on Korider that I'm getting e-mail updates for.

Keep it going!
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Death666wish_

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Re: Another GT250 Racer Build
« Reply #9 on: May 27, 2014, 08:16:20 PM »

Scorpion also make a full system, good luck with your Frankenstein!!
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