758 ultra lows according to the old site. Jake dimensions are given in most renthal adverts on ebay, get a tape measure and knock yourself out!

It might be worth ringing round specialists asking about rebuilding your shock with the right spring for you. IIRC brook suspension in Bradfords had some good noises made about his oe rebuilds. New oil and a re-gas (that right?) and it'd feel a marked improvement after 10 years of the oil getting more and more like cappucino...

Get a Nitron if you can. I'm sure the Hagon will be an improvement but i've never known anyone be dissapointed with a Nitron.i know even the basic one is a fair wedge of money but also the Nitron will have decent re-sale value if you sell the bike on. At just under 11 stone ifound the stock forks springs far too soft especially considering the power of those bluespots. Definitely worth putting in stronger fork springs imo.  Probably about .9 or .95 kg/mm rated linear springs if you're 12 stone.

Quote from: wraith600 on 08 March 2012, 08:03:59 am

Quote from: thom_1991 on 07 March 2012, 09:49:32 pm

Bear in mind you'll effectively make your rear spring softer (not really you're changing the linkage ratio but anyway...) and it'll want to lean over further on the sidestand. Get the projection components one they give you 4 options i settled on +10 before i got a new shock.

http://www.ebay.co.uk/itm/Yamaha-FZS600-Fazer-600-four-length-jack-up-kit-NEW-FZS-600-1998-2002-/260970767621?pt=UK_Motorcycle_Parts&hash=item3cc311e505

def the best option 

jacking up actually makes ur suspention stiffer

Shorter thing so less leverage. Yeah you're completly right, oops.

In need of new head and rear wheel bearings for an Fzs 600. Doing a search on here i found that "bike bearings" site someone suggested for the thou but they don't list head bearings for the 600.... From wemoto i'm looking at about £50 all in if anyone could help me better that or has any exerience of the quality of them etc

Cheers

And also near enough £100 for some jets. No ta.

Way over my head that last post.. anyhow just a quick update i went for the hyperpro kit and if any one is interested it came with 20w oil.

Basically i was wanting to know what weight spring is best for the Fazer's shock for 11 stone me. Unlike forks where you'd use pretty much the same rating spring for the same rider regardless of bike the right shock spring for say a 10 stone rider will be different from one bike to another.


As it turns out i took my Nitron in to be re-sprung for me and according to an Ohlins book they had it needed a 925lb/inch or 16.5kg/mm. It was actually wearing a 725lb spring which would explain why it felt so soft. The standard shock wears a 14.7kg/mm spring which would suggest the standard shocks only sprung right for people who weigh less than 11 stone.


I hope this makes sense.

Sadly the chart explains the obvious solution, but the springs you can buy for the Fazer are not linear, they are all (as far as I'm aware) dual rate progressives. Still, it would be fairly easy to fit a set of 1.0kg/mm springs from another bike with 41mm forks with a bit of investigation.

The Hagon / Hyperpro replacement springs are progressive, meaning they have about two thirds of the spring with loose / wide coils & the final third with coils very close together. Effectively it's a dual-rate spring that is a one-size-fits-all solution, and so can be roughly equivalent to 1.0kg/mm springs. Most suspension shops won't touch progressive springs as they are difficult to fine-tune, particularly for racing / trackdays. For road use however, they are fine.

Raising the forks up through the yokes will improve the handling but reduce ground clearance & the amount of travel the fork has. I suspect you're being asked to do this to allow more weight over the front-end. I take it you have to either fit heavier fork oil or change the height of the fluid inside the fork to compensate?

Fit a cable tie first so you can see how much travel is being used up. I would start @ 5mm, then if ok go to 10mm, then 15mm if you still have a safe amount of fork travel left.

I got mine from Firefox Racing they're linear K-tech .85kg/mm. IIRC they're the same fit as for the early Hornet 600.

Suspension

Sort out your fork springs before getting any more out of the brakes imo. I found the blue spots completely overwhelmed the front end even before i'd got more bite from stainless hoses and ebc hh pads.

Find out for certain how rich and where in the rev range by getting an afr run done on a dyno?

Preload doesn't increase the springs stiffness just how much they initially compress. Don't bother with Hagon as they're progressive and a one size fits all "solution". Linear forks springs in the front probably 0.85 or .9kg/mm along with that Nitron which will come correctly sprung and setup for you.

83.5 just the full micron system & 116 DG MAIN

93 with modified micron system & K&N

Modified how? Seriously another 10bhp, with the same dyno and similar conditions?