Bike purrs like a kitten all the time, BUT!

[CaNsA]

As soon as i hit about 8k the bike seems to suffer. It wont go over it, the most i got out of it last night was 90mph in 6th gear @ 8k.

I have put a proper air filter in, the old one turned out to be a bit of foam. There was gaffer tape over the 2 bolt holes in the middle of the air box, and over half the main air intake at the top of the box.

I have removed all that tape, the bike is great under 8k, but seems there is a loadsa air, but need more fuel thing going on.

Easy way to resolve this?
Dyno ? expensive
Tape? cheap
Magic ? need to find a wizard

Cheers

P.S.

[stug]

The holes in the airbox are supposed to be blocked off with rubber gromits.
I would put tape back on to block the holes again.

Its not restricted is it?

[masterofinsanity]

as said those holes need blocking off pm me your address and i'll send you a couple.

and over half the main air intake at the top of the box.

do you mean where the snorkel is supposed to be???

[CaNsA]

There is rubber holding the snorkel in place

[masterofinsanity]

has the bike been setup on a dyno before??

[raynaldo03]

i'd have to have a stab and say it could be restricted mate and who ever you got it off hasnt told ya.
has it always done this??

[RedexRobB]

Im assuming it started doing it once you removed all that tape? In wich case its probably running lean now.

If you wanna check its restricted take a close look at the inlet rubbers, if its restricted you should see a shiny extra bit of ally inbetween the rubber and head. Alternatively push up one of the needles from the back of the carbs with the throttle wide open and have a look down, you should see a nice dark hole.

As previously mentioned those holes are meant to be blocked.

The only reason to block the snorkel is to richen up the mixture, id have those plugs out and see what they look like.

[Tom1528]

what can have you got mate?

[CaNsA]

Its an MTC Can, im gonna pull the tank and airbox off again for the 4th time this week and have a looksee for bits that shouldnt be there.

Ill let u guys know later today what my findings are

[Davw]

If not restricted it sounds like fuel starvation at high revs-ie no power /wont rev above certain level etc. Try checking the fuel filter while you have the tank of - try bypassing it.

[CaNsA]

Bike is running sweet again,
Covered up the bolt access holes, and 1/4 of the air intake with tape. And left a good few cars standing at the lights onthe way home. I might open up the air intake again, while keeping the bolt access holes covered and see what happens.

Stand by for action!!!!

[CaNsA]

After running the bike for a couple of weeks, and attending the dyno day @ j+p, i am going to put the bike in for some jetting work to resolve the issue.

The beast has been running hot and Chris replaced the sender on the rad for me with one he pulled of a track zxr he had parked up outside for 30 squids fitted.

Peace out