Initial suspension setup - help

[flymo]

Hi all,

Any suspension specialists out there

Just prepping my K3 race bike, come to ride it for the first time today with clip-ons and its awful. Anything other that dead straight and the bars feel like they want to tip in very strongly to full lock.

It had wide bars when I got it and it was styled as a streetfighter so my guess is that the rear end may be way too high. The forks are set correctly as per the manual so they are not high in the yolks. I have nothing to compare it to though.

Two things I thought of, the rear dog bones may be none standard length. The ones on it are approx 150mm between centers.

The rear shock is from a GSXR1000 and came with the bike, looks like the preload is set pretty tight.

Any ideas?

Because there's so many variables and we can't try the bike, it might be worth starting right from the beginning.

This is a really useful guide:

http://www.gostar-racing.com/club/mo...ion_set-up.htm

Cheers,
Carl

[flymo]

Originally Posted by Berlin

Because there's so many variables and we can't try the bike, it might be worth starting right from the beginning.

This is a really useful guide:

http://www.gostar-racing.com/club/mo...ion_set-up.htm

Cheers,
Carl

Ok thanks, will do. Can anybody help with regard to the geometry of what it 'should' be at the rear though, maybe the shock is too long, maybe the doglegs have been replaced etc. I really wanted to get some confirmation that they are somewhere close to what they should be.

Bear in mind I'm only talking about a 5-20 mph up and down ride here up and down the back road by my garage, nothing fast yet. But the steering really snatches in like a kids scooter wheel.

I used to have the riser dogbones on my road SV and while the size difference was minimal it does make the bike steer a little quicker. Not too sure about the GSXR shock though? Do the wirral guys have the same Minitwins regs as BEMSEE? Because I had to replace the dogbones back to the originals as part of the regs.

[flymo]

Originally Posted by sideshow46

I used to have the riser dogbones on my road SV and while the size difference was minimal it does make the bike steer a little quicker. Not too sure about the GSXR shock though? Do the wirral guys have the same Minitwins regs as BEMSEE? Because I had to replace the dogbones back to the originals as part of the regs.

Do you know what size the original dogbones are?

Sorry mate I cant remember the exact sizes. All I can remember is that if the dogbones are shorter it raises the rear making the bike turn in a little quicker. Not much help seeing as you dont have anything to go by. I'll try and measure mine as accurately as possible this evening and let you know.

[flymo]

Ok thanks. The ones on the bike have '17G' stamped on the side of them, not sure what that means. anybody?

Originally Posted by flymo_racer

Bear in mind I'm only talking about a 5-20 mph up and down ride here up and down the back road by my garage, nothing fast yet. But the steering really snatches in like a kids scooter wheel.

That would make sense with the longer dogbones. Steeper steering angle, less rake and trail. Have you tried backing the rear preload off all the way to see if that has any effect? If it calms things down it would confirm that the dogbones are the problem.

Carl

That is the 70 profile front have on the front making it do that ... (being a race bike I presume you have a 70 section front tyre?!!? )

The 70 profile at slow speed if friggin horrid

So if you have a 70 section tyre, don't fret, perfectly normal behaviour at <20 mph!!

If you have a 60 section - we have a problem

Two things I thought of, the rear dog bones may be none standard length. The ones on it are approx 150mm between centers.


i have a set of dog bones sitting in my garage that came of a normal faired bike not the nacked bike and the total lengh from 1 end 2 the other is 180mm so it seems yours are a we bit shorter.