SV650 race mods

**GSVR** · 18th June 2007, 11:34

I'd like to thank Robert for posting up this information. I know very little about this subject but when you get good quality information like his things start to make alot more sense.

I think its much better to have questions answered in the forum as if this was told to me at the track or on the phone I would forget it. But here you can print this off or refer back to the thread anytime to refresh what has been said.

Cheers Robert.

**Pussy** · 18th June 2007, 12:13

I find it more convenient for both RT and myself to email. I had a question regarding a possible modification to the front end of my 750, spoke to RT on the phone, then emailed. RT has it on his own inbox then. To give you an idea of the backup.... RT replied to my question via email, sent at 4:00am Saturday, as he was getting ready to help you fellas at Manfeild

**Darkman** · 18th June 2007, 16:11

question about tires...is it nessesary to balance them for the race bike? I see that some people change tires at the races so obviously don't balance them.

**bistard** · 18th June 2007, 16:14

Originally Posted by Darkman

question about tires...is it nessesary to balance them for the race bike? I see that some people change tires at the races so obviously don't balance them.

Yes,they have to be balanced for sure!!
You will find they are balanced at the track,Statically

**k14** · 18th June 2007, 16:16

Originally Posted by Darkman

question about tires...is it nessesary to balance them for the race bike? I see that some people change tires at the races so obviously don't balance them.

Well either you weren't looking close enough or the people changing were lazy. Yes it is very important you balance tyres after you change them at the track. It is very easy to do with just a small jig that balances your wheel with the axle through it and you just let the wheel spin so that the heaviest part slowly turns to the bottom and then you progressively put more weight on until it will stay steady without rotating, thus its balanced.

Sometimes it can take 5 mins or so but it is imperative to do. Can cause all sorts of stability problems when racing.

**GSVR** · 18th June 2007, 16:21

Originally Posted by Darkman

question about tires...is it nessesary to balance them for the race bike? I see that some people change tires at the races so obviously don't balance them.

We flipped Glens back tyre around at Manfeild on Saturday because it was wearing badly on the right hand side and balanced it before fitting the wheel back on the bike.

You should balance your tyres and it can be as simple as putting a screwdriver though it and finding the heavy side. A proper static balancer would be better. And of course dynamic balancing best of all.

**Darkman** · 19th June 2007, 11:36

one more thing...steering dampers..what do you use on yer SV race bike? Spoke to RT and the ohlins top mount are no longer made for this bike. He can however fit a side mount for a reasonable price, my only worry is that if the bike lowsides, it'll be screwed?
Spoke to a guy in the UK that builds the protwin race bikes and he only fits top mount, but the ones that he use is quite pricy.Any ideas? Anyone have a side mounted fitted on their bike?

**FROSTY:Me** · 19th June 2007, 15:12

mate --go to www.svrider.com have a look in the racing section --I asked exactly this question and theres some responses

**Drew** · 19th June 2007, 18:43

Originally Posted by bistard

Yes,they have to be balanced for sure!!
You will find they are balanced at the track,Statically

I've changed many a tyre at the track, and not balanced them, never had a problem, that's on the thou, changed a tyre for Whitetrash there this weekend, no balancing, and he didn't have a problem either.

It is recomended, but not essential, especially on an SV650, which has a relatively low top speed, and is light enough to cope with a wee shudder no worries.

**Darkman** · 20th June 2007, 13:55

and another question yet again...what spocket sizes do you run at manfield on the SV's? Is a 520 conversion needed? well since i'm gonna change the sprockets i might as well.

**Keystone19** · 20th June 2007, 16:26

I believe GarryH will be able to answer all your questions in a few days Andries - when he picks up his new toy that he is keeping very quiet about...

For what it's worth, I have done a 520 chain conversion on my SV. Sprocket choice is up to you as the rider and is probably not important until you get some pace on and figure out what will work best for you at each track.

**Possum41** · 20th June 2007, 23:39

I believe GarryH will be able to answer all your questions in a few days Andries - when he picks up his new toy that he is keeping very quiet about...

Ahh so you know something jill!!!! what is he getting??? i knew he was up to no good, i bet he's been converted and is getting a new HYOSUNG!!! lol

**GSVR** · 21st June 2007, 07:08

Originally Posted by Darkman

and another question yet again...what spocket sizes do you run at manfield on the SV's? Is a 520 conversion needed? well since i'm gonna change the sprockets i might as well.

The standard gearing of 15 - 44 works fine. You can go to 14 to 44 as theres still plenty left in top gear but this although technically sounding better may not be as good.

BTW I dunno where Jill gets her information but theres a huge difference between going to look at a bike and actually buying it. Hope this doesn't sound grumpy.

Anyone know what the Pro Twin rules are yet. Can you fit aftermarket rearsets? Can you fit Manual camchain adjusters? Are you allowed to replace subframes? Can you run non SV rims? The longer MNZ delays the more people are building bikes that wont comply with the rules.

Also on the tyre balancing I seldom balance my tyres because I'm just lazy. Maybe balancing your rim before fitting the tyre would be a compromise. As for fitting the lightest part of the tyre to where the valve stem is it would make more sense to mark the heaviest part of the rim and fit it there I'm thinking.

**Keystone19** · 21st June 2007, 08:01

Originally Posted by Possum41

Ahh so you know something jill!!!! what is he getting??? i knew he was up to no good, i bet he's been converted and is getting a new HYOSUNG!!! lol

Originally Posted by Garry H

BTW I dunno where Jill gets her information but theres a huge difference between going to look at a bike and actually buying it. Hope this doesn't sound grumpy.

Ahh..you see, he is being as obtuse as ever...

Never grumpy though Garry...