Tuning & the crank. - SV650.org

28-03-10, 02:24 PM

Over this winter iv have been upgrading and overhauling the suspension on my sv and generally cleaning it up for this years trackdays and ride outs.
Come this winters overhaul, im turning my attension to the engine and trying to squize some more ponnies out of her, but before i do i have noticed that there have been a few comments about a weak crank.
So i was wanting to know what the problem or problems are with the crank before i p*** money down the drain

I have 2000 sv with about 10,000 miles and was thinking about a 700cc bore kit and maybe a few home mods in my workshop so any info would be invaluable, thanks jimmyb.

yorkie_chris · 28-03-10, 02:58 PM

The cranks snap anyway.
It is a problem because of the inertia of the alternator acting across a weak point.

I would buy flatslides, not big bore.

28-03-10, 03:06 PM

So whats the first thing to do with the crank then? sort the alternator for a spears supersport one or an sps crank from america? And arnt flatslides going to be more expensive than the bore job?

yorkie_chris · 28-03-10, 04:23 PM

Yeah aftermarket alternator, lightened starter clutch.
Flats, more expensive than big bore job but better pickup and no penalty in reciprocating mass.

28-03-10, 06:52 PM

Lol at spears spec of the sv650 curvy for the win check the peak horsepower out.

http://www.spearsenterprises.com/tech_sv650_99.html

31-03-10, 03:20 PM

mines going to be 800 when im finished then

Speedy · 31-03-10, 05:42 PM

WOW!! 770hp!!!!!

What fuel does it use? Plutonium?

28-03-10, 02:24 PM	#1
jimmyb Guest Posts: n/a	Tuning & the crank. Over this winter iv have been upgrading and overhauling the suspension on my sv and generally cleaning it up for this years trackdays and ride outs. Come this winters overhaul, im turning my attension to the engine and trying to squize some more ponnies out of her, but before i do i have noticed that there have been a few comments about a weak crank. So i was wanting to know what the problem or problems are with the crank before i p*** money down the drain I have 2000 sv with about 10,000 miles and was thinking about a 700cc bore kit and maybe a few home mods in my workshop so any info would be invaluable, thanks jimmyb. Last edited by jimmyb; 28-03-10 at 02:25 PM.

28-03-10, 02:58 PM	#2
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: Tuning & the crank The cranks snap anyway. It is a problem because of the inertia of the alternator acting across a weak point. I would buy flatslides, not big bore. __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

28-03-10, 03:06 PM	#3
jimmyb Guest Posts: n/a	Re: Tuning & the crank So whats the first thing to do with the crank then? sort the alternator for a spears supersport one or an sps crank from america? And arnt flatslides going to be more expensive than the bore job?

28-03-10, 04:23 PM	#4
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: Tuning & the crank Yeah aftermarket alternator, lightened starter clutch. Flats, more expensive than big bore job but better pickup and no penalty in reciprocating mass. __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

28-03-10, 06:52 PM	#5
Aaron90 Guest Posts: n/a	Re: Tuning & the crank Lol at spears spec of the sv650 curvy for the win check the peak horsepower out. http://www.spearsenterprises.com/tech_sv650_99.html

31-03-10, 03:20 PM	#6
jimmyb Guest Posts: n/a	Re: Tuning & the crank mines going to be 800 when im finished then

31-03-10, 05:42 PM	#7
Speedy Member Mega Poster Join Date: Apr 2006 Location: Biggin Hill,Kent Posts: 1,074	Re: Tuning & the crank. WOW!! 770hp!!!!! What fuel does it use? Plutonium?

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