Hi Guys,

I'm fairly new here, I have a Honda VFR400 NC24 which I love, however, she's been playing up recently.

When you open the throttle and hit around 11k revs the bike sort of "judders" or "splutters" slightly then all of the sudden it springs back to life and accelerates perfect.

Starting doing this in 2nd, but seems to do it in every gear now, it's as if there's an issue with fuel. Then, I started noticing that the bike will not do more than 100mph. (On a private road ofcourse) When hitting 100mph it quite literally stops revving, change gear, nothing. Stops again around 11k revs.

Now im slightly concerned because the bike was service in February.

The only thing I can imaging could cause this is fuel filter? Or the vacuum hose coming off the top of the tank, it seems to run below the tank but does not connect to anything - just hangs loose?

Ofcourse, any help you guys can provide will be greatly appreciated.

Thanks,
Dan

dcorker wrote:Hi Guys,

I'm fairly new here, I have a Honda VFR400 NC24 which I love, however, she's been playing up recently.

When you open the throttle and hit around 11k revs the bike sort of "judders" or "splutters" slightly then all of the sudden it springs back to life and accelerates perfect.

Starting doing this in 2nd, but seems to do it in every gear now, it's as if there's an issue with fuel. Then, I started noticing that the bike will not do more than 100mph. (On a private road ofcourse) When hitting 100mph it quite literally stops revving, change gear, nothing. Stops again around 11k revs.

Now im slightly concerned because the bike was service in February.

The only thing I can imaging could cause this is fuel filter? Or the vacuum hose coming off the top of the tank, it seems to run below the tank but does not connect to anything - just hangs loose?

Ofcourse, any help you guys can provide will be greatly appreciated.

Thanks,
Dan

lol vaccum hose has to connect to the engine else you will have no vaccum to open the fuel tap... unless the tap is leaking of course.

the vaccum hose runs from the tap to the rear left cylinder, it connects to a spigot on the outside of the cylinder partially obscured by the frame.

vaccum line worth replacing, even if they look ok they can collapse at high speed when they are old

Thanks for that info. I'll get a new hose ordered and make sure it's connected lol

I may have misunderstood here. The hose I am talking about is not the one from the tap but the one from the top of the tank

dcorker wrote:I may have misunderstood here. The hose I am talking about is not the one from the tap but the one from the top of the tank

ah i think you mean the vent hose?

tha runs to a t-piece and goes to nothing (open air)

as for your vaccum hose on the fuel tap, always worth replacing if its not fresh as that can cause no end of runnign problems.