bike stalling/jumping at low revs (3-6000rpm)

[ruddiger]

hi all,

i recently got a gsxr400 gk76a model,

have a bit of trouble with it,

basicaly when i pull away from a stop it struggles when going through from bout 2-6000 rpm,
it is ok sometimes if i rev the balls out of it and let the clutch go slightly but that aint too good for my gearbox,
sometimes it just splutters a bit other times it cuts right out! which aint fun when on motorways etc.

it also cuts out when slowing down sometimes but same again if i keep revving a lot is keeps it going,
when it does cut out it will only start when i have the throttle open the full way but will only give about 1.5000 rpm and cuts again once i let the throttle go.



i checked a few posts and it could be the Rectifier? but im not sure

has anybody had similar probs or heard of this happening?


cheers

[M1KE]

Carb cleaning needed i think.

[ruddiger]

carbs have been cleaned recently so should not be them yet,
will give it a go in a few days if i cant find anything else......

anybody know where my airfilter is locaated?

[mattUKNC]

My NC sounded very similar when the rectifier packed up. I felt/ acted like fuel starvation but a rectifier and battery later, all is well.

[ruddiger]

yea, from reading a few posts it sounds like it could be the rectifier as i had the carbs done not too long ago.

how easy/hard is it to change the rectifier and if i change it do i need a new battery too?

if the rectifier is dead wont the lights dim whenm not reving the bike? dont think that is happening!

[mattUKNC]

When mine went I tried to keep the bike going as long as I could as thought it was fuel related, I got about 2 miles before everything was dead! The battery was completely fried. So I'm not sure on other symptoms I'm afraid.

To change on an NC30 it's very simple, rear fairings off, 2 bolts, 1 clip connector, job done. The battery is just there too, 1 rubber strap and 2 clamps.

The gsxr might be similar. :D
Good luck.

[ruddiger]

cool,
what does a rectifier look like?

also the bike aint dead at all, it runs fine at high revs and cuts out from time to time......still sound like the rectifier?

[garynortheast]

I don't think it's your rec/reg at all. If it had packed up then your bike would not run and if it didn't blow the main fuse first it would blow the battery.

I still think you need to be looking at the carbs, particularly the O rings and the idle mixtures. Getting the plugs out and checking the colour of them would give you a good idea about what's going on with your fuelling.

[Austyn]

Agree with carbs, 3-6k is likely to be o-rings and/or float heights, be worth taking the float bowls off and check all the carbs are set to the same float heights, (had me head scratching for a while )

[vibe]

Sorry to jump in oin your thread but what/where is a rectifier and what does it do?

bit new to bikes lol

Thanks

V