who like Bob B has a track prepped GS500.

What has been done to the bike (emphasis on engine and drive train)?

How much did it cost/ how much time invested?

Other GS500 track bike info?


thanks.

This is probably a good source.  There are others.  

http://www.gstwin.com/racers_corner.htm

Quote.
"Some things are simple, but if you need that extra final horsepower, you can spend cubic money for the last little bit.  Some people claim to get 55 to 60 horsepower, but it costs approximately a Subaru. "

hmmmm... for the price of a subaru i should get a trashed gsxr 750 and make it decent.

oh well...

I  have touched just about every part of the bike, for track prep.
In the engine, I removed the starter, removed the counterbalencer, and flywheel. Bored the cyclender 1mm over ( that was the legal amount allowed for lightweight Twins) lightened the pistons ( cut off the piston skirt), put in an oversized intake Titanium valve ( went from a 29 to 30mm) ( or maybe it was from 28 to 29mm  :dunno: ).
Put in a manual camchain tensioner, degreed the cams, put on some 36mm carbs from a gsxr750.  Removed the airfilter, and put airfilter spray on the inside of the box.
The best thing I did was progressive springs in the front, also, gsxr rearsets, and aftermarket pipe kept me from dragging the right side of the bike, and pivoting out of control. And degree-ing the cams felt better too.

how well did the gsxr rearsets fit?

They worked great, but the brackets had to be made by hand.
Out of a chunk of aluminum,  I triangulatd the dimensions of my homamade ones. I cut a hole for the peg, and had to include two notches. Once you disassemble the rgsxr rearsets, you will see what I mean. here is a picture of one of the bikes we did it to. ( this bike currently belongs to another member of this board. ( thank you for letting me use this image.

Hey, that looks like the bike I bought!  :lol:

Quote from: GSJamesHey, that looks like the bike I bought!  :lol:

It does?  I'll swap rear wheels with you.

looks nice. i was thinking about getting an older gs 750 for highway travel, and using the gs 500 strictly for around the town and track days, i don't want anything ridiculous out of the 500, but i want it to be a compotent machine in both areas.

next on my to do list, front suspension.

Track prep and race prep are 2 completely different subjects.

The bike I sold had....
79mm pistons (the ones you cannot get anymore)
Megacycle cams
Katana front end with Racetech springs and emulators
Fox Twin Clicker shock
S/S braided lines
GSXR rear caliper
EBC HH pads
Barnett clutch
Timing advancer
Full Yosh
if you want to see the rest of the stuff.....
http://gstwins.com/forum/viewtopic.php?t=18400

It was used as a race bike but I only did track days. I kept the starter since I did not want the hassle of bump starting it. I have started on another bike, using a 541 motor (78mm pistons). It will be similar to the bike I sold. In the end I will have basically $0 in it as I have been able buy and sell enough stuff to acquire the parts for free.

I do have all the parts to build a 4-valve head motor and a crank shaft to make it a stroker which would end up being a 650cc. This may happen with the other frame.

If you are just looking for a track bike.....suspension, brakes and tires are the 3 things that must be addressed first. Raising the rearsets is a good idea. Worry about the motor later. Building a motor for a GS track bike is not going to be finacially smart. If you are racing then consider it. Upgrade the parts as you go.

what does the kat front end have better than the GS?  is it primarily the 2 front brake setup?

that rear seat/cowl will fit on an '04f ? :dunno:

Quote from: ginoethat rear seat/cowl will fit on an '04f ? :dunno:

It is not designed for it but it can be made to fit. There is a pic of one on a F in the for sale forum, listed by Pacer. I have made a master for a 01+ race tail but no idea when I will be able to make the mold.

you can build a fast GS....
BUT....
it will be one of the slowest bikes on the track

and yes i raced one for 10 years

I've got a front end off a late eighties CBR600 I believe.  Two calipers, and I think it's 2 piston per caliper.



I believe my bike was track-prepped.  Unfortunately, I the present owner want it back to stock condition so I find myself tracking down chain guards, fabricating passenger brackets and things, and I'm pursuing left and right side fenders, and a gauge cluster (the speedo on it now is supposed to be used for a bicycle!)