Top Speed 2001 FZS600??

[Dalton Godwin]

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

[locksmith]

Top speed is definitely not normal, but why the fuck are you trying top speed runs with a possible knackered wheel bearing???  :eek :eek :eek :eek :eek

[sinto607276]

:agree
Is it a blue bike per chance? :lol

A possible reason for the rubbing sound could be the front discs are slightly out, have you checked them? This would cause rubbing onto the pads which in turn would heat them up, so check there too.

What revs have you got at this speed? Reason for asking is are you sure your using all the gears? Might sound daft but a mate bought a bike years ago and found out it had the top gear missing so as much as he thought he was in top it actually was only in 5th so therefor couldn't get maximum speed out of it, just a thought.

If you are replacing bearings etc make sure you grease all the moving parts.

[andybesy]

Just to reassure you they do around 135, maybe a little more or less depending on the bike, but certainly should go right up to 100+ without thinking about it.

I guess in principle failed wheel bearings could affect your top speed, but they would have to be causing a LOT of friction to hold the bike back that much, and that amount of energy is going to show itself as heat.

I think if you're unsure of your bearings then it's a no brainier to change or at the very least inspect them irrespective.

But I'd also be looking closely and both brakes to see if there is any binding.

Perhaps is restricted in the carbs?

Andy

[joebloggs]

Has a restriction kit been fitted?

[BIG MAC]

Err a 51 plate in fast blue with micron exhaust absolutely will not ever do an indicated 142 mph...that would be madness. Equally a similar bike cannot do 130..two up

[BBROWN1664]

Sounds like you have a restrictor kit fitted Dalton.

Does it accelerate rapidly to that speed then stop accelerating or does it just run out of puff at that speed? If the latter, then I would definitely think it is restricted. If the former, it could be clocks related. I have heard something about the rev counter link to the ECU. Others will know more about that.

If it is a black one, indicated 145 is possible though in reality it is more like 130. Obviously this test was carried out on a private motorway in deepest darkest Kent on a quite summers evening with another black FZS600 keeping pace. The blue, red, gold and silver ones couldn't keep up.

[joebloggs]

Mine does 175 in 2nd, has custom paint though, when sprayed Kenny Roberts colours I expect it will do at least 200, on the back wheel, up hill,head wind, with the brakes on.

Don't listen to all the other speed claims, they're all deluded................

[sinto607276]

Mine does 175 in 2nd, has custom paint though, when sprayed Kenny Roberts colours I expect it will do at least 200, on the back wheel, up hill,head wind, with the brakes on.

Don't listen to all the other speed claims, they're all deluded................

:lol :lol

[celticdog]

Get the front wheel off the ground, on the centre stand with someone sat on the back or a block of wood/jack under the sump. the front wheel should spin freely, I'd say it won't be the brakes as you'd smell the pads burning and the discs and calipers would be red hot at 86mph!!!

Next test the wheel bearings, full lock one side and someone to hold the bars, hold wheel front and rear if it even has a hint of a wobble replace the bearings.
I think your looking at a fuel restriction or an exhaust problem, black smoke or excessive noise? Look for 4 rubber washers behind the carb rubbers, if there remove and refit.

[fazersharp]

These "am I restricted" questions do appear from time to time. IF it takes so much dismantling and detective work to see if a bike is restricted or not then what happens if you get pulled over by mr plod, how do they check if the power matches your licence.     

[BBROWN1664]

Fazersharp - If they have any doubts, plod impound the bike and get it checked.

[joebloggs]

These "am I restricted" questions do appear from time to time. IF it takes so much dismantling and detective work to see if a bike is restricted or not then what happens if you get pulled over by mr plod, how do they check if the power matches your licence.   

Lad at work was pulled for speeding on a supposedly restricted bike, the bike was going quicker than it should have been able to so they had it stripped and checked, not sure which caused him to be banned but lets just say he was in trouble either way

[fazersharp]

[quote author=fazersharp link=topic=20329.msg234419#msg234419 date=1466082093]
These "am I restricted" questions do appear from time to time. IF it takes so much dismantling and detective work to see if a bike is restricted or not then what happens if you get pulled over by mr plod, how do they check if the power matches your licence.   

Lad at work was pulled for speeding on a supposedly restricted bike, the bike was going quicker than it should have been able to so they had it stripped and checked, not sure which caused him to be banned but lets just say he was in trouble either way
[/quote]
I see thanks both
I wonder if they also bill you for the effort taken.
You would think that there would be some sort of anti tamper tag attached that can just be quickly looked at

[Fazer99]

I would probably put money on that it has been restricted as I had a somilar problem with my FZR600, it would get to 80/90 really quickly and then just loose power, I never found the restrictors but the guy I sold it to stripped it down and found them under the carbs and shazzam the power was there.

[Bretty]

Mines a 2000, silver one.

I went to Hamburg and gave it a good blast on the Autobahn. It ran out of puff at an indicated 138mph. It got u to that speed pretty quick. I removed the panniers and top box and gave it another go and it did the same thing.

I've since fitted a scorpion exhaust and been across Europe again and it still runs out of puff at about an indicated 140mph, I'm sure with my head down, down hill, with a prevailing wind and a bit of perseverance it would do 141mpg.

[clayt74]

Mine is bog standard other than K&n air filter. Mine tops out at 138 indicated 129 on GPS.....

[Fazer99]

Mines a 1999 red one with a scorpion exhaust and I've had 140 out of it and a swear it was still gunning for more  :eek

[celticdog]

Sh1t myself once on the motorway at 125+ the steering was starting to get a bit wobbly so I chickened out but I don't think there was much left in the old girl to be honest, that's on a '99 silver, with a very loud art can. 

[sinto607276]

it would do 141mpg.

Fek me, I'll need to find out how you get that! :pokefun