Hitting a invisible brick wall

[IamEEKY]

Hi Guys,

My bike is a Fazer 600 99 plate, unsure on the mileage on the engine but the bike has done 49,600 miles

I've read tonnes and tonnes of posts for several weeks now, (even the whole 43 pages of Red98's which I thoroughly enjoyed...) but nothing is quite like mine, so here it goes

When accelerating hard from "0 to 100 real quick" the bike pulls perfectly, until I get to 101mph (in 3rd) and then I hit an imaginary brick wall... But its not like I shunt forward or anything, its like i've ran out of power. If I hold the throttle wide open it will eventually pick up speed, but it would take atleast 30 seconds to get to 110mph. When this almighty wall has hit me, the whole bike feels like it is out of sync, almost like a Harley and it also sounds similar to a vtwin apparently (mate on a zx10r rode next to me so I could show him).

When the bike is hot it is around 85-90mph when I am greeted with this wall, and it doesn't matter what gear I am in...

I replaced the engine for a known working one (roughly between 20,000-25,000, due to the whole engine overheating and also loosing the second gear... and the issue is still there 

The Carbs are clean and run perfectly and the Coils have the correct ohmage.


Please help    Im loosing the plot haha

Ofcourse this is all done on private roads, and this isn't a big deal... but it would be nice to know what's happening and I was hoping to get onto Brands Hatch on the 26th


Any help would be appreciated 


Thanks,


Tom

[darrsi]

We're the carbs changed as well?


Air filter okay?


How long have you had the bike?


Is it possible that it was previously restricted?


Has it ever gone over 110mph?

[IamEEKY]

We're the carbs changed as well?


Air filter okay?


How long have you had the bike?


Is it possible that it was previously restricted?


Has it ever gone over 110mph?

Hi Darrsi,


The carbs are the original, they were cleaned around about 6 months ago.


The Air filter is good, KandN, had it since i owned the bike 3 years ago, was cleaned about 2000 miles ago.


I sold the bike to a good mate on 33bhp restrictions, so we put the plates in, and then brought it back off him around about a month ago. I was sitting around for 8 months, and he had only done around 3000 miles on the bike.


Yes, I have had 155mph out of it before selling it to my mate.


Thanks,


Tom

[clayt74]

Sure it's not the Rev limiter??  Never tried mine that hard
Maybe I should!! 

[JoeRock]

Have you taken the plates back out? 

[Frosties]

Have you taken the plates back out? 

Or even tried changing up from 3rd 

[Paulfzs]

Yes, I have had 155mph out of it before selling it to my mate.

 

[His Dudeness]

Sounds like it's restricted. There's two types of restrictor,the after market washers and the Yamaha restriction through the carbs

[darrsi]

Cleaning the carbs is one thing, having them balanced can help "a lot" although i doubt that's the main problem.


Don't rely too much on the filter being spotless, we've had some odd weather this year, mainly the tail end of other countries sand storms, i know this 'cos my K&N was noticeably dirty after 700 miles.



It does kind of hint at some sort of restriction by the sound of things, from earlier posts on here that sounds like a similar speed where the engine tends to run out of puff.


Have you ever noticed any hissing when opening the petrol tank cap, there'sa small possibility the tank breather could be blocked causing a fuel restriction?


If you really had 155mph out of it before then congratulations, 'cos you once had the fastest FZS600 in the country! 

[Punkstig]

155?
Pah I say!

And pah again!

Besides that, clearly you know about engines and are experiencing a problem, but I wouldn't expect it to get any faster in 3rd!

[IamEEKY]

Sure it's not the Rev limiter??  Never tried mine that hard
Maybe I should!! 

I wasn't aware that they had a rev limiter :S

Have you taken the plates back out? 

100% there are no plates in there 

Have you taken the plates back out? 

Or even tried changing up from 3rd 

Any gear after 3rd it does it, but it is near enough at 100 every time so I can put it in 6 th and go from 30 to 100 no problem, today when it was happening I pulled the clutch and reved and it was still sounding like it was dying and I was unable to redline until my speed dropped...

Sounds like it's restricted. There's two types of restrictor,the after market washers and the Yamaha restriction through the carbs

The carbs were never restricted, and I restricted it with the plates for my mate myself.

Cleaning the carbs is one thing, having them balanced can help "a lot" although i doubt that's the main problem.


Don't rely too much on the filter being spotless, we've had some odd weather this year, mainly the tail end of other countries sand storms, i know this 'cos my K&N was noticeably dirty after 700 miles.



It does kind of hint at some sort of restriction by the sound of things, from earlier posts on here that sounds like a similar speed where the engine tends to run out of puff.


Have you ever noticed any hissing when opening the petrol tank cap, there'sa small possibility the tank breather could be blocked causing a fuel restriction?


If you really had 155mph out of it before then congratulations, 'cos you once had the fastest FZS600 in the country! 

The carbs are balenced, and the the bottom end is amazing, a zx10r struggles to keep up round roundabouts/twisteys ... Until around 60... Haha :L

I'll take the filter out and give it a clean then see what happens

And the tank pressure is good, I checked when I saw that in red98s post 

And thanks haha obviously that's was clock speed rather than gps 

155?
Pah I say!

And pah again!

Besides that, clearly you know about engines and are experiencing a problem, but I wouldn't expect it to get any faster in 3rd!

Clock speed and it did take a while to get there but it used to pull to 140 and then slowly build up speed but it really helps with a lower faring and being 10 stone 
And she wants to go slightly more in third but "runs out of puff"

Soured for the long post but thanks for your help so far guys 

Thanks,
Tom

[IamEEKY]

Just an update guys, I replaced the rectifier, and that didn't help so now I am thinking fuel... 


Thanks,


Tom

[darrsi]

Kinked fuel line.
Blocked fuel filter.
Fuel tap switched fully on?

[IamEEKY]

Kinked fuel line.
Blocked fuel filter.
Fuel tap switched fully on?

Nope,


Will see what state the fuel filter is later on today when I get home from work


And definitely   

[Frosties]

Are the plug caps making a good contact to give a good spark...coils and plugs good?


It sounds like already mentioned - fuel starvation, air filter, blocked carbs etc. or you're a real fat bastid buuut apparently only 10 stone


Weird one 

[His Dudeness]

You're certain its not restricted with the Yamaha restrictors

http://i.imgur.com/MXYe06W.jpg

[Jules-C]

If I remember correctly the Yamaha restrictor used different springs and needles and possibly slides as shown in the photo.  If only the plates are removed although additional air getting through carbs the additional fuel isn't being picked up hence the problem if only the plates have been removed.  The bike will be running incredibly lean

[IamEEKY]

  I wrote a long reply this morning but it didnt post and now I cant remember what I wrote 

Are the plug caps making a good contact to give a good spark...coils and plugs good?


It sounds like already mentioned - fuel starvation, air filter, blocked carbs etc. or you're a real fat bastid buuut apparently only 10 stone


Weird one 

From what I can tell the spark plugs caps and coils are good

Kinked fuel line.
Blocked fuel filter.
Fuel tap switched fully on?

Nope,


Will see what state the fuel filter is later on today when I get home from work


And definitely   

I took the fuel filter out and it was quite dirty...    so i blasted it out, and i have ordered a new one should be here Thursday/Friday 


I noticed that the fuel pump wasn't "clicking" when the tank was off, so I took it apart, all looked ok, hooked up to the battery and it spewed out some fuel with tiny bits of debris ??rust??cleaned and then noticed that the wire connector was very "used" so it's taped up for now 
I brought a KandN Recharge kit, cleaned and oiled the air filter all nice and red 


This morning i made some progress    it made it to 110 before dying, so i must be on the right track? 

You're certain its not restricted with the Yamaha restrictors

http://i.imgur.com/MXYe06W.jpg

Oh wow, that's cool, I never knew about them   But i'm 100% sure I didnt see anything like them in the carbs when they were cleaned 


Thanks,


Tom

[clayt74]

Are you sure you have standard gearing on the sprockets!! Sounds to me like you are expecting too much from the bike? Mine is standard and in 3rd (on a private road) I just top 100mph at 13krpm (just into the red) and I wouldn't wanna push it beyond that plus you are way beyond the max torque point so pretty pointless??
If you had different gearing it would explain your higher speeds but would also explain the additional loading that would cause your overheating problem?

[JoeRock]

Thinking about it - this sounds exactly the same as what mine was doing when the spark plug caps were breaking up   (although mine was happenening at around 80 odd. Might be worth replacing them (there's a red NGK set people use that work perfectly) - not very expensive from what I remember?

[darrsi]

Thinking about it - this sounds exactly the same as what mine was doing when the spark plug caps were breaking up   (although mine was happenening at around 80 odd. Might be worth replacing them (there's a red NGK set people use that work perfectly) - not very expensive from what I remember?

http://www.ebay.co.uk/itm/1x-NGK-Resistor-Spark-Plug-Cap-SB05F-black-8080-/361217508598?pt=LH_DefaultDomain_3&hash=item541a3dc4f6

[IamEEKY]

Hey Guys,

So the fuel filter turned up on Friday, put that in and tested, still the same... 

I was having some fun on some roundabouts next to a petrol station yesterday, and i ran out of fuel so i stuttered to the fuel pump and the noise sounded exactly the same as when it hits 110. Filled up to the brim, actually managed to put 20 quid in  after that the bike managed 120, and I have no idea why :S

I know that the sproket sizes are the same as when i had it before.


I did let my mate have a go and he did say that there was a very faint mis-fire, which could be getting worse when i get to those speeds?


Anyway Ill keep you posted and I will get some caps soon 


Thanks,


Tom