Top Speed 2001 FZS600??

[Millietant]

Hi All,

A bit of a back story coming up, but I (think) I have a problem with the top speed of my bike.

About a year ago I bought myself a Cat-D write-off 2001 FZS600. All it needed was new forks, and front fairing.
So me being me, I decided to do a twin Xenon headlight conversion instead of replacing \ repairing the front fairing.
A knock-on effect of this was that I needed to replace the clocks as they got in the way of the headlights, so I fitted a KOSO DB-01R Digital Clock.
(Ok, I probably needed need to, but I wanted too!!)
Anyway, after much fun trying to get the digital clocks setup, I finally got it booked in for an MOT, and it PASSED  :eek
Since riding it I noticed there was a constant "scraping noise" coming from the front wheel, so I stripped down and rebuilt the front calipers. This didn't help and the scriping noise remains, so I've just ordered a set of bearings, but have yet to fit them. It could do with a service too no doubt.
Before I had kids I was always a Suzuki Bandit man (will I get shot for saying that on here?), Now that my kids aren't babies anymore, I'm back to biking, hence me buying the Fazer.

So, back-story done, we come on to my current issue. The top speed of my bike appears to be 86Mph. My Bandit 600 was always good for 115-120mph. I've verified the Fazer speed with a GPS Speedo on my phone, and the new Koso Speedo, and the GPS Speedo are remarkably close together, with only 1 or 2 mph variance.

So my questions would be:

Is this poor top speed normal?
Would knackered front wheel bearings prevent a FZS 600 form going over 86mph?
Any other ideas what my issue would be?

Thanks all

Dalton

So what happens at 86mph Dalton - are you at full throttle ? At what speed does winding on more throttle stop making any difference, does it misfire at that speed, what RPM's is it running at, does it stop at 86mph in 4th, 5th, 6th gear or in all of them? - it's difficult to give any real feedback without a better description of the problem.


I put a restrictor kit on our sons 600 Fazer when I bought it, as he was only 3 weeks past his 17th birthday when he passed his test - but even so, it would eventually get up to just shy of 110 mph in the right conditions if the throttle was teased on gently after the restrictors effect kicked in, in top gear. The thing was though, because it was a carb restrictor kit, it would run out of steam in all gears at around 7,000 rpm (the sign of a restricted one) and once you reached 2/3 throttle, opening it further had no effect whatsoever.


With the restrictors removed it flies - it's indicated +140 mph at the Nurbutgring after the gantry on the final straight and it got there with ease. Oh, and it's a Silver '03 model (no top box on at the 'Ring though).