GS1000 streetfighter idea w/ picture

[dorkburger]

Welcome back. I must have missed this one, as it’s certainly the type of bike I would remember.
Awesome job.

[80GS1000]

Great to see you back PJ. Looking forward to seeing the bike completed. I really liked what you did with it when I saw it at Bruce's place. Now it will be even better. Still racing that 750 or have you moved on?

Thanks Sandy.

I stopped racing in 2011, and didn't ride motorcycles at all from about 2011-2017 due to family/career/education reasons.

I got the motorcycle "itch" again a couple of years ago and rebuilt my crashed GSXR with new OEM street fairings.

Since it was running a GSXR 600 engine (race regulations, can't run a 750 motor unless you want to run against the liter bikes), I treated the 750 to a new engine I built over last winter and spring for street and trackday duty.

With the GSXR now all dialed in, it's time to sort the GS1000.

[80GS1000]

Welcome back PJ

Thanks Dan.

[Sandy]

Great to see you back PJ. Looking forward to seeing the bike completed. I really liked what you did with it when I saw it at Bruce's place. Now it will be even better. Still racing that 750 or have you moved on?

[salty_monk]

Welcome back PJ

[steve murdoch]

I remember that bike. Glad to see you are back at it.
7 years under the tarp? That must have been tough knowing it just needed a few finishing touches.

[80GS1000]

Hey gang, I'm back at the GS1000 R&D game after a number of years away. Good to be back at the GSR! Hope everyone is well.

As "found" partially disassembled when the tarp was removed from the 1000 after many years:



The bike as it sits now, with the addition of a Yoshimura slip-on (muffler bracket removed temporarily shown here), Earl's oil cooler and billet oil cooler takeoff, superbike bars, and Koso electronic tach/speedo/oil temperature gauge.

I've changed the rear wheel to a 2006 GSXR 750 for better chain alignment. More on that later...

Tail section is off until I get the bodywork repainted.







In order to improve aesthetics (hunched over stance due to short GSXR 1000 forks) and handling (a bit more twitchy/unstable than I'd like so more rake & trail needed), I plan on adding about 20 mm of front ride height via some fork cap extensions for the GSXR forks.

As it so happens, the board on the ground under the front wheel is about 20 mm high so it gives a good preview of the before and after stance.

Before:



After:



Other plans for the cold weather wrenching season include:

• Adding a heavier spring for the rear shock to match the bike & rider's weight better - currently too soft
• Fixing the leaky oil pan
• Getting the chain run perfect. I've mocked up a 2006 GSXR 750 rear wheel in the pics above to help in the effort to get the chain run straight. I was using a 2005 GSXR 750 rear wheel before and had to machine the sprocket carrier and cut down the cush drive rubbers to get the chain in the ballpark of alignment. The 06 750 rear wheel is narrower than the 05 at the hub & sprocket by about 5-6 mm without modification. Once I shim the 5/8" offset front sprocket, I hope that the chain alignment will be perfect.
• Adding a wideband oxygen sensor & gauge (Dynojet Wideband 2) to truly dial in the RS flatslide carburetors
• Paint and bodywork - needs a respray and the dent pulled out of the left side of the tank () after a 0 MPH tipover. Case covers need to be either resprayed or powdercoated. Currently leaning toward a GS1000S style paintjob but in darker, solid blue on top of the tank & tail.

Something along these lines:

[Rob S.]

I like the "as stock" picture, and the pictures of the old Yoshimura race bike. I just don't see a connection.

I'd use a different bike as the starting point for the Yoshimura re-creation. You'd be destroying the value of your old GS. What model is it, exactly?

Edit: I read the first post without looking at the date.

this bike is so sweet!!!! i just love these ole gs;s.

i was wondering how the stock cylinder is handling the 73.5mm pistons? i heard it left the liners super thin...

thanks
matt

I had found a cheap set of 93 forks on ebay. Guess I'll let them go till I do some more research on what will work. I keep seeing mention of CBR954 Drop Triples. What year and model are they from? Can I get an 18 inch wheel and use the drop triples maybe?

Ask Katman about the CBR triples.

http://www.suzuki-katana.com/katana_suspension.html

I had found a cheap set of 93 forks on ebay. Guess I'll let them go till I do some more research on what will work. I keep seeing mention of CBR954 Drop Triples. What year and model are they from? Can I get an 18 inch wheel and use the drop triples maybe?

The current front rim is 19 and tire is 100/90 19 I think. The fork length I dunno they are stock with new progressive springs.

Break out the tape measure.

Seriously though, figure about a 1.25-1.5" drop from going to 19" to a 17" front rim and tire, then subtract the difference in fork length too between your proposed forks and your stock ones. Are you leaving the rear twinshock or going mono?

John K said about that the GSXR K : 740 mm forks with the 17" front wheel were too short for his Katana, so keep that in mind.

The current front rim is 19 and tire is 100/90 19 I think. The fork length I dunno they are stock with new progressive springs.

I'm planning on doing the 850 Cylinder conversion as well but waiting to find a deal on it. What length are the stock forks from my 750? I'm using clubmans now and hope to find some clipons for the new forks. I plan on using the stock 93 wheels and brakes and triples.

Anybody know if 93 GSXR750 forks will be long enough for my 79 GS750?

Are you doing any other mods to the bike? Those 93 GSXR 750 forks are 740 mm.

What size front rim and tire does your bike run now?

How long are your current forks, from the center of the axle to the top of the fork tube?