Tank fuel flow issue??

[Farmingstock]

Having issues with my nsr misfiring, kind of like it's got a sporadic rev limiter.

So after doing all the General bits and bobs I thought I'd try riding a temp tank (zipped into my jacket and piped straight to carb with no filter)

This cured the issue and the bike revved round till it ran out of fuel!

So I did a little experiment:

With the temp tank 300ml of fuel took 15seconds to drain out!

The nsr tank took 45 seconds to drain the same amount out with tank cap off!

So I'm guessing the standard tank isn't flowing fast enough to keep up with the need of the carb which is leading to running if of fuel momentarily at high revs.

Could this be an issue and if so how do I cure it??

[Chris45]

[Farmingstock]

It's kinda like when your running out of fuel the bike will go then splutter if you know what I mean? But at high revs it just misfires, but if I let off it will ride fine.

I have tried putting the choke on at speed when its doing it but that makes it just bog down and run worse.

However when I ride it with a free flowing temp tank, it runs absolutely perfect.

Could it still be an electrical issue if it runs perfect with the temp tank on?

I tried it to try and iliminate that but are you saying it could still be an electrical issue?

[Chris45]

[jaffa90]

NSR what????????????????????????

[Farmingstock]

It's an NSR125

[Kickstart]

Hiya

By coincidence I had a similar problem this weekend. Turned out to be corrosion in one of the pipe connectors on the fuel tap.

Katy
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Farmingstock]

Was thinking of just replacing the whole tap, pipe, filter for new as my reserve is none existent anyway!

There are new nsr250 taps on eBay cheap!! not sure if they will fit but no cheap 125 taps

[Kickstart]

Hiya

Taps are normally fairly easy to strip down and clean out. I would do that first

All the best

Katy
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Farmingstock]

I have already done that, stripped, cleaned, blown out. But no change, so just thought but new.

The flow is to slow, it just trickles out, like it's not a full tube of fuel coming out if you know what I mean?

[Kickstart]

[Chris45]

[Farmingstock]

Hi yes it has a filter, I'm going to replace for new if I can find one for a good price, the tank it clean but has some internal rust patches which won't be helping things!

I took the in-line filter off which made the fuel flow much better, it maybe restricting flow but it's not perfect so will dig deeper again! Full tank of fuel in it too, nightmare!