Join Date: Aug 2007
Location: Vancouver Canada
Motorcycle: 1985 GSXR 750, 1986 GSXR Limited, GSXR750RK (in restoration mode), 1973 GT-750 (no longer have, looking for another)
Re: Suspension Swap
I'm used to talking about GSXR's in terms of years so I may get this wrong but here goes. I'm assuming the GSX-R750F is the 1985 GSXR and the GSX-R750L is the 1990.
I've owned my GSX-R750F since 1986 so I've had some time to form an opinion or two. The GSX-R750F has a shorter swing arm than the G/H models and that presents IMO the greatest problem for the bike on the street. In OEM form, it was a twitchy and nervous bike on regular roadways. I've also got a Limited GSX-R750R LTD (G) and it has a completely different feel from my GSX-R750F when it was OEM as far as stability compared to the GSX-R750F.
So with that out of the way, I wholeheartedly recommend the front end transplant + wheel and tires. It brings the bike into the modern world. As a bonus, it can be done in such a way that you can return it to stock without any signs that it had been modified too. The steering stem is the same diameter and it takes the same bearings. You basically remove the entire front end, brakes, wheel, clipons, upper and lower triples and install it on your GSX-R750F. Change the upper and lower bearings while you're at it. It's cheap and you will note an improvement after 33 years of use and abuse.
Important: When you have the front end off the GSX-R750L, take a hack saw and remove the steering lock horns from the lower triple. They will bind on the GSX-R750F frame and you won't get enough turn radius unless you do this.
You also want to do the rear wheel swap and in order to make that work, you'll need the wheel spacers from the GSX-R750L. You will also need to put a curve in the rear brake torque bar so that it will clear the wider rear tire. I'm running a 120/180 combo on my GSX-R750F and it is amazing.
The rear shock on the F will be hooped and probably has been for the last 30+ years so change it up. I put an Ohlins in mine but they are pricey. With a little fabrication Yamaha R6 shock will fit. The spring rate won't be 100% perfect for the really picky riders among us but it will be heads and tails better than the OEM which is unserviceable.
Anyway, have fun and hopefully you'll share some photos.
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