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Discussion Starter · #1 ·
Hey guys,

My 08 zx10 just has a 16T front sprocket and racefit exhaust on, but it seems to have a drinking problem.

Normal round town riding it uses 7-7.5 l/100km (approx 32mpg)

Getting into a bit, but nothing too crazy, sees 9l/100km (26mpg)


I can live with that, but I just did a track day yesterday and after 80km (50miles) The bike wouldn't hit 10,000rpm, it got to 9500 and felt like it was hitting a rev limiter. It was doing this in 2nd, 3rd and 4th gear.
I got it back to the pits and looked in the tank, it appeared to be half full or so. I threw 5litres of fuel in and went back out and it ran fine.

A bike like this shouldn't suffer from fuel starvation on track surely? At least not after only 50 miles?

Anyone got any ideas or had this happen to them?
 

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Maybe you would need to vent the tank?
If you noticed air got sucked into the tank when opening the tank lid, that would maybe
be the problem.
I think this has been discussed before..
 

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Kinked fuel line? Might be an idea to investigate. A mate of mine suffered this problem intermittently a couple of years ago and a kinked fuel line turned out to be the culprit.
 

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Hey guys,

My 08 zx10 just has a 16T front sprocket and racefit exhaust on, but it seems to have a drinking problem.

Normal round town riding it uses 7-7.5 l/100km (approx 32mpg)

Getting into a bit, but nothing too crazy, sees 9l/100km (26mpg)


I can live with that, but I just did a track day yesterday and after 80km (50miles) The bike wouldn't hit 10,000rpm, it got to 9500 and felt like it was hitting a rev limiter. It was doing this in 2nd, 3rd and 4th gear.
I got it back to the pits and looked in the tank, it appeared to be half full or so. I threw 5litres of fuel in and went back out and it ran fine.

A bike like this shouldn't suffer from fuel starvation on track surely? At least not after only 50 miles?

Anyone got any ideas or had this happen to them?

Why do you think it was because of fuel?

7-9l/100km is fine, half tank after 80km track day - is fine.

Problem is somewhere else
 

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Discussion Starter · #5 ·
Air didn't seem to get sucked in when I opened the tank, but it had 15 or so mins after coming off track before opening it.
The tank does squeal a lot when its running lowish on fuel after stopping, but I read that this is normal.
I am thinking this could be the problem though.

If it was a kinked line wouldn't it do it regardless of fuel level?

The issue isn't the fuel usage (just curious as to other owners figures). If the tank was half empty after 80km's, thats fine. But a bike like this shouldn't suffer performance issues with a half full tank?
I still think it is fuel related as it ran fine after I threw 4 litres in.
My Kawasaki dealer is contacting the race team to see if they know of any issues relating to it.
 

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What I was saying is that if it is an intermittent problem (ie. the low rev ceiling), the extra fuel int he tank might not have fixed it, per se. The problem may have just disappeared for a bit and may (or may not) return.

My mate had this on his CBR1000RR. He complained and complained that it wouldn't rev. Then I rode it, no problem. Then the bike was pulled apart and the fuel line was kinked.

Also, the fuel usage you described on track is not bad at all. My old 98 R1 used to run dry after about 54km around Eastern Creek. My ZX10R was thirstier than the R1, but I never took the 10 to the track.
 

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My mapped ZX-10R gets about 40mpg under normal riding conditions (~14.2 afr). You can map it to get better mileage but you lose some on-off throttle smoothness.

It also depends on how much you weigh, but I've found that at WOT my ZX-10R drinks dead dinosaurs fast enough to give Al Gore conniptions.
 
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