SV 650 4 degree advance - SV650.org

08-01-14, 02:06 PM

Bought a couple of SV650 4 degree advance woodruff keys a year or so ago and never fitted them.

Supposed to improve throttle response and add a couple of bhp, I believe JHS knock these out at £25 a pop

Haven't got an SV now so up for sale.

They fit Curvys and Pointys

£12 each inc postage

09-01-14, 09:15 AM

Both keys now sold

11-01-14, 04:02 AM

what are these keys? never herd of them............ still new to biking

johnnyrod · 13-01-14, 12:39 PM

It means the alternator rotor (also ignition signal generator) sits 4 degrees further advanced, it's a stepped Woodruff key, I'm told this is a common tweak in karts. Anyway it gives you a dollop of bottom end, see the red and blue torque traces for a stock (and rather weedy) 1999 SV650:
http://www.johnnyrod.co.uk/dyno.gif

13-01-14, 12:57 PM

Thanks for the info I wouldnt need that on my 2009 twin spark would I or would it still male a difference?

johnnyrod · 13-01-14, 01:00 PM

Dunno to be honest. JHS sell them too ,you could ring them and ask.

13-01-14, 01:03 PM

Jhs??? Cheers

JulesW · 13-01-14, 04:24 PM

JHS Racing, they specialise in SV650 minitwins and supertwins amongst other things.

13-01-14, 05:03 PM

Thanks all for your help

08-01-14, 02:06 PM	#1
hardhat_harry Guest Posts: n/a	SV 650 4 degree advance Bought a couple of SV650 4 degree advance woodruff keys a year or so ago and never fitted them. Supposed to improve throttle response and add a couple of bhp, I believe JHS knock these out at £25 a pop Haven't got an SV now so up for sale. They fit Curvys and Pointys £12 each inc postage Last edited by hardhat_harry; 08-01-14 at 02:46 PM.

09-01-14, 09:15 AM	#2
hardhat_harry Guest Posts: n/a	Re: SV 650 4 degree advance Both keys now sold

11-01-14, 04:02 AM	#3
Mark-SV-UK Guest Posts: n/a	Re: SV 650 4 degree advance what are these keys? never herd of them............ still new to biking

13-01-14, 12:39 PM	#4
johnnyrod Member Mega Poster Join Date: Jul 2003 Location: Doncaster, oop norf Posts: 2,128	Re: SV 650 4 degree advance It means the alternator rotor (also ignition signal generator) sits 4 degrees further advanced, it's a stepped Woodruff key, I'm told this is a common tweak in karts. Anyway it gives you a dollop of bottom end, see the red and blue torque traces for a stock (and rather weedy) 1999 SV650: http://www.johnnyrod.co.uk/dyno.gif

13-01-14, 12:57 PM	#5
Mark-SV-UK Guest Posts: n/a	Re: SV 650 4 degree advance Thanks for the info I wouldnt need that on my 2009 twin spark would I or would it still male a difference?

13-01-14, 01:00 PM	#6
johnnyrod Member Mega Poster Join Date: Jul 2003 Location: Doncaster, oop norf Posts: 2,128	Re: SV 650 4 degree advance Dunno to be honest. JHS sell them too ,you could ring them and ask.

13-01-14, 01:03 PM	#7
Mark-SV-UK Guest Posts: n/a	Re: SV 650 4 degree advance Jhs??? Cheers

13-01-14, 04:24 PM	#8
JulesW Member Join Date: Jul 2013 Location: Wirral Posts: 444	Re: SV 650 4 degree advance JHS Racing, they specialise in SV650 minitwins and supertwins amongst other things. __________________ Bikes I've owned and loved: Bridgestone 90, Honda CB175, Suzuki GT250, Yamaha YZ125, RD350LC x2, RD350YPVS x2 & FZR600, Honda CB900F, Suzuki SV650S K6, 2014 Triumph Street Triple R

13-01-14, 05:03 PM	#9
Mark-SV-UK Guest Posts: n/a	Re: SV 650 4 degree advance Thanks all for your help

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