SV650 race mods

[Robert Taylor]

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.

Garry,

I totally disagree about not balancing tyres. Unbalanced tyres, no matter how small the imbalance sets up an unwanted oscillation frequency and that is just something further that your dampers have to dampen. While it is difficult to quantify, it will harm lap times, mechanical grip and ultimately yours and everbody elses safety. Severe imbalance will also accelerate the demise of your tyres.

Static balancing is actually quite easy to do as long as you follow some basic rules. Perhaps I should touch on this in an upcoming seminar.

During a walk through the pits on Saturday I came across a GSXR600 with a very tight rear chain. So many people commit this sin! It will overload your transmission and transmission bearings and make rear suspension adjustments less than meaningful.

Like so many sports those who work hard at learning their craft and optimising settings ( and indeed the basics ) will be rewarded.

Now I know that I am hard to pin down because I am so busy and ( with all respect to his current predicament ) am never going to be an ''in your face'' Shaun Harris sort of guy.....but please if you have any questions at a meeting, please come and ask me. My philosophy is to help people understand setting changes, not to do it all with no explanation and nothing learnt.

[codgyoleracer]

Also a horsepower loss with a tight chain Robert. GlenW

[Drew]

I'll concede a point to RT here, given his expertese, I'll start balancing wheels, it is fuckin simple, can be done with a golf ball and some stick on wieghts if you're real slack.

I'll mock up a jig for sitting axles and rims on, and any one who wants one, can hook me up with the materials cost.

[GSVR]

I'm wondering how out of balance a modern tyre is to begin with. Just reading some burb about Pirelli Corsa's being made totally by robotics "MIRS" and the uniformity is near perfect and imbalance minimal so possibly putting one of these tyres onto a balanced rim you will end up with a well balanced wheel anyway.

When I first started fitting my own tyres I balanced them alot but then found that if I left the lead on from the last time I balanced the wheel it was pretty close anyway leading me to the fact it was the rim that was out of balance and not the tyre.

Anyway I totally agree that anything works better and produces less harmful vibration and osillation when balanced correctly unless the vibration is a requirement.

Did I mention Pirelli Tyres! Dam good tyres

[Billy]

Sorry Gary,Jill got her information from me.Spoke to Dave Key on Monday to try to secure Kyles bike as a spare for Jill for the upcoming season (not that we need an extra bike at this stage,A fit rider would be of more use LOL).Sounded like a done deal too me still I guess nothings sold til the money changes hands aye.Have to give Dave another ring this morning.Cheers Billy. PS.Interesting point re tyre balance.Lent my 150 to Craig Shirriffs to do some tyre testing for MNZ when I got it back I noticed the tyres were not balanced.Causing considerable mid corner patter.When I spoke to Craig about it later he informed me he has never balanced his tyres ever.Go figure

[Keystone19]

Oi - stop giving away my secret sources Billy!

Gotta keep Garry wondering - it's another one of my race strategies - know more about your opponent than they know about themselves...!

Oh, and a question about balancing tyres - I know with the pirelli slicks they claim to be pre-balanced i.e. line up the red dots and you should be ok. How accurate is this or are the drugs working overtime again and there are no red dots?

[GSVR]

Oi - stop giving away my secret sources Billy!

Gotta keep Garry wondering - it's another one of my race strategies - know more about your opponent than they know about themselves...!

Oh, and a question about balancing tyres - I know with the pirelli slicks they claim to be pre-balanced i.e. line up the red dots and you should be ok. How accurate is this or are the drugs working overtime again and there are no red dots?

No wondering here Jill. The red spots are meant to be on the heaviest part of the tyre. The valve is meant to be the lightest part on the rim. Or is that the other way round? Anyway a good way to find out if you back wheel is balanced is to put the bike on the stand and rev the hell out of it in top gear. If it shakes itself off the stand and flips doing a wheelie you know the wheels not balanced.

Now wheres my K4 GSXR 1000 with 1500ks on Trademe for 10 Grand....

[oyster]

With the crude suspension on these it's absolutely critical to balance the wheels. I fixed a flatty on a youngster's bike the other day, (wrong tube, poorly fitted) they bought the best tyre as recomended (and fitted) by an Invercargill retailer, a Bridgestone. It ran 3mm out of true and took 105 grams to balance. Luckily it was on the rear, otherwise I would have suggested it NEVER went on the track again. Still, a big compromise. I suggested they took it back for a refund.
ALL WHEELS MUST BE BALANCED, it's a safety issue as well as performance.
It's another reason we like to use old slicks down south. They run true (within a millimetre) and often need no balancing (less than 5 grams)

[Robert Taylor]

Craig will laugh when he hears about this, he is a rider and will get someone else to do it, IF available. So many of these guys will ride around problems until there is a tech on hand to adjust ( also adjust the riders brain! ) Pirellis are less out of balance than many others but all tyres should be balanced, full stop. This is just as applicable to Casey Soner as it is to Joe Bloggs racing.

[Robert Taylor]

Sorry Casey Stoner! I guess what I am trying to say is we can either strive for mediocrity or strive for excellence, depends how hard you want to work at it...............................

[Tim 39]

thanks for this info Robert, I will make sure my wheels are balanced better from now on.
also thank you for your talk at the MNZ seminar in Christchurch, I learnt a great deal about the basics of suspension and I'm sure everyone else would have too!
Thanks again
Tim

[Billy]

Oi - stop giving away my secret sources Billy!

Gotta keep Garry wondering - it's another one of my race strategies - know more about your opponent than they know about themselves...!

Oh, and a question about balancing tyres - I know with the pirelli slicks they claim to be pre-balanced i.e. line up the red dots and you should be ok. How accurate is this or are the drugs working overtime again and there are no red dots?

Mmm Sorry bout that Jill.Just trying to clear you of any blame re misinformation.Anyway I wouldnt worry too much about confusing Garry if he is happy to drive for 4 1/2 hours to look at a bike hes already seen with no intention of buying it Hes obviously already confused.

Re the Dot/valve saga.Some tyre manufacturers have the dots next to the valve stem indicating the light spot,Some have them opposite,Some have red dots,some have yellow,some have 2 dots some have 1,If at any stage you see more than 2 dots or they are not red or yellow seek medical advice.In the case of Pirellis it is red dots next to the valve.I would advise as has Robert that all tyres are balanced no matter what as the world is not a perfect place.Re the drugs Ive told you before to wait til after the crash before using them.Cheers Billy

[codgyoleracer]

Didnt you guys know that Gary has already bought my old bike ?

[GSVR]

Mmm Sorry bout that Jill.Just trying to clear you of any blame re misinformation.Anyway I wouldnt worry too much about confusing Garry if he is happy to drive for 4 1/2 hours to look at a bike hes already seen with no intention of buying it Hes obviously already confused.

Re the Dot/valve saga.Some tyre manufacturers have the dots next to the valve stem indicating the light spot,Some have them opposite,Some have red dots,some have yellow,some have 2 dots some have 1,If at any stage you see more than 2 dots or they are not red or yellow seek medical advice.In the case of Pirellis it is red dots next to the valve.I would advise as has Robert that all tyres are balanced no matter what as the world is not a perfect place.Re the drugs Ive told you before to wait til after the crash before using them.Cheers Billy

4 and a half hours? You obviously haven't taken a close look at my van or been heading in the same direction leaving an hour or so after me. Is a shame I couldn't reach an agreement with Mr Key I wish him all the best with the sale.

As for the Dot and valve thing. Some car rims have a dot on the rim. Why do people think the valve is going to always be the lightest spot. Some rims like the SV ones aren't nearly as well made or balanced as a top of the range sport bikes rims.

[Possum41]

Didnt you guys know that Gary has already bought my old bike ?

so does this mean you have a new SV glen??? i don't know why you would need a new one, we can't even get near you on your old one!!!! i think you should jump onto a 150 in our class and at least give us a slight chance
As for the tyre balancing, i'm too lazy too do it myself and plus i don't have the levers or patience so the shop change mine and they always balance them so can't comment and racing on unbalanced rims.