downgearing my k3 gsxr 600

[Keir]

Ive had my gsxr for a year or so now and recently have been looking at moving up to a 750 for that 'little bit extra'. However, i love my bike and cant find a suitable 750 so.... im going to try downgearing.

What should i do? -1 at the front? anyone done this? much difference? How much top end will i loose?
Will it involve new chain etc or just the front sprocket swapped?

Thanks
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Current : '08 Yamaha FZ1s
Previous: '99 Honda CBR 600FX, 03 ZX636 B1H, 99 Fazer 600 (red), 02 GSX-R 600 K2, 00 SV650s (red), 2008 ZX10R, 97 Bandit 1200N, 04 ZX6RR K1H, 04 GSX-R 1000, 98 Fazer 600 (gold), 05 Madness 110 Pit bike, 04 CR125R, 00 SV650s (black), 06 KTM 625 SMC, 99 SRAD 600 track bike, 03 SV650, 98 Bandit 1200N, Bandit 600SY, 03 GSX-R 600 K3, 01 GSX-R 600, 01 Fazer 600 (black), VFR 400 NC30 x3, 78 Honda Dream, 00 Speedfight 50

[MarJay]

I'd personally go two down on the front and two up on the back. That way you keep the number of teeth the same and can use the same size chain.

Also, I'd probably just get a new chain and sprockets unless the chain is brand new, because it isn't the best idea to have new sprockets with a worn chain.

If you go one down on the front then you won't notice the difference.

Also you should try to keep the total number of teeth on the sprockets an odd number so that the chain doesn't run the same links over the same teeth each time.

{edit} and you'll hardly notice any loss of top end unless you regularly do trackdays at Snetterton!! {edit}
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F; Cheap project: CBR900RR FireBlade
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[gixxersixx]

Ive been running my 600 k1 with -2 off the front and +4 on the rear for about a year, ive also changed some of the internal gearing, so mine will be slightly different. straight line accelleration is fantastic, great for sliding the rear out of corners. On yours though that set up will drop your top speed to about 140ish. You will get an increase in fuel consumption nothing too major and your speedo will be out and at legal speeds will be over reading by about 10 mph, but a rough guide is about 10mph per 1000rpm in top eg 5000 rpm = 50 mph, one thing I have found is in the wet weather the rear spins up a lot more, in the dry the front heads skywards. If you dont want to change your bike then go for this. Its worth doing and ask yourself how many times do you redline the bike in the first three gears against how many times you redline in top, you wont miss the top end mph.
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