FZR600 low-RPM issues

[Lil Freek]

Hey hey

I'm new to biking (roadbikes) and I just bought a used FZR600 from my friend.

I'm not 100% sure what could cause this, but it seems as though any driving done under 4000rpm causes the bike to stall out. Smells REALLY rich and I have to clutch in, punch the gas and drop the clutch to get it to go. So long as I keep the RPMs above 4000, it seems to ride alright.

Carbs were jetted from 4000 and up last year, and 0-4000 this spring (I'm assuming this might be the cause of the problem)

Any other ideas as to why the bike sputters under 4000 and stalls out?

Thanks!!

[abs929cbrrr]

fzrs never did run good at low rmps, is your air filter clean or are you running pods? whats year fzr?

[Lil Freek]

Hmm. It's going to sound "special", but where's the air filter on the bike?

It's a 1991. I'm quite the noob to this bike stuff. Good with cars, so I'm sure some of the knowledge transfers?

Thanks!

[ashtong63]

Air filter is under the gas tank cover. If you have a large black box in front of the gas tank that's the airbox, and the the filter can be removed by taking out the 4 screws holding on the intake. If there's no black box but either 2 or 4 open filters, you have pods.

[abs929cbrrr]

what he said

[Lil Freek]

Oh... I just looked on fzrarchives for the instructions on how to check air filter.
Sorry ashton, after seeing the pictures of how to access the air filter, I now understand what you're writing. I'll hopefully be home early-ish tonight and have a chance to remove the gas-tank cover while it's still light outside. I'll check the filter and clean/replace if necessary.

This is going to be a bit slower than usual. Work is crazy and school is starting up again.

Thanks for the help - I'll chime in again after I've checked the air filter

[Lil Freek]

so i checked the filter, it's brand new and nicely oiled. It's a good quality K&N filter.

I turned on the bike today, and it sounds like crap, like there's only a few cyl. firing (sounds much like a dirtbike).

I'm going to call the mechanic who did the tune-up and carb-jetting and have him pick up the bike and fix it. My buddy had it running fine last year, and now it's not working properly anymore.

[Lil Freek]

culprit found. Dying/dead coils were the reason behind the super-rough idling and the stalling.

The shop is trying to get rid of the last little bit of rough-idle, but otherwise, major problems are solved

[the_finch]

My 1997 FZR600 did the whole "dirtbike" thing periodically if I hadn't ridden it in a while. The thing I got that solved that was a $20 battery float charger. When it's parked for more than a day or two I leave it on the float charger to keep the battery topped off. Our bikes usually seem to run like crap with a half charged battery.

[Lil Freek]

Well that's shite. I don't really have access to a plug, outside
I know there's an outlet about 30ft from my bike, but since I live downtown, I'm not sure if I'd wanna leave anything worth money out in the open without it being locked down.

[Lil Freek]

so it's riding a bit smoother... the coils were replaced.

But it seems to have hesitation under 4000rpm, still. If I gently add throttle, it's seems better, but if i try to punch it under 4000, there's severe hesitation.

From reading the manual, it sounds as though i might need to adjust the idle screw or the choke (which i can't find in a manual)

Mechanic said the carbs were fine (after disassembling them again). He and my friend test drove the bike for 20-30min, and now it's hesitating again after about 5min of my driving it. Maybe I'm a tard? But I can't see what I'm doing wrong. The bike stalls a couple times at low RPMs when it's heating up, but once up to running temp, it doesn't stall anymore when the choke is all the way off.

[shredex]

Its either you have a fowled spark plug you need to replace...
or your carbs need a good sync...

replace the spark plugs...
and sync the carbs...

[Lil Freek]

Since he replaced the coils, I'm assuming he checked the plugs. But I'll check them when the sun bothers to show face again