Something has taken a giant shit and it sounds expensive

[bogan]

New filter in - seems alright. Somewhat hesitant at low revs, but then again it was cold and I wasn't pushing it hard. Seems like it starves of fuel at random, especially on hills but also does it on the flat too. Still haven't managed to empty this tank of fuel. I read somewhere about fuel pick up lines around the petcock/fuel tap getting clogged so once I run dry I'll have a decent look.

Full clean out of the carbs, petcock, and lines sounds like the order of the day...

[SNF]

Full clean out of the carbs, petcock, and lines sounds like the order of the day...

Its looking that way I don't really want to pull the carbs myself - scooter ones are easy mine look like a head fuck. Would it cost heaps for someone to do it, obviously I am expecting it'll be a few hundred

[frogfeaturesFZR]

also let the fuel pump fill up the carb bowls
mine wouldn't rev over 8-9 k if the tank ran low and I had to switch to reserve.
Turn the key on, let the pump run, and turn the key off. Then repeat a couple of times.
Always worked for me. After doing thar she'd rev out to 14 k

[The Reibz]

I owned a FZR250 for 5 years (Still got it actually) and I can tell you that this is a pretty common problem.

Replace all fuel lines and Fuel Filter (Super Cheap Auto) Get a can of carb cleaner from them too, CRC if you can.

Remove Tank, Airbox, Throttle cables and then lift the carbs off the engine, Tape up the ports or stuff rags in them so you don't drop anything down there and have the rip the head off to get it back, if you drop something (m4 bolt) down there and start bike then your as good as fucked.

Take off the float bowls, remove the plastic floats and check the o-rings aren't damaged. If they are, replace them. Also look for rust in the bowls, if they are orange around the gaskets, your tank is fucked and will need to be resealed. Take the diagram covers off and slide them out with the needles. Keep all the parts from each carb together and dont mix them up or else your fucked.
Now spray that shit with the cleaner (clean EVERYTHING), you can even take the jets and tubes out and soak them over night if you want. Find the mixture screws and turn them all the way in, then out 3 turns. DO NOT FORCE THEM IN, USE FINGER PRESSURE ONLY.
Now put it all back together and make sure you don't forget anything.
Put 98 in the tank and never run 91 again. Have had nothing but problems with 91 in these bikes.

While you got it apart, clean and gap the plugs and do a oil and filter change.

Start her up and take her for a ride, she should be all good, if not you will need to check the float levels in each carb and take it from there.

I got pictures galore on how to do this. Let me know if your keen or else you can take it to baron and take out a 2nd mortgage to pay for it.

Take it (or get somebody else to take it onto a closed and private road ) ... and fucking ring it out. Learners seldom get it up to the revs/speed it was designed to do.

Do this as well, can show you a few roads around your area. You will find most of the problems will sort themselves out hahhaha

[SNF]

I never run 91 in this, it always gets the good stuff. Its had new spark plugs, new fuel filter, new air filter, oil and filter done 500 odd km ago.

I'm not going to Red Baron for a carb clean on a 24 year old beat-to-shit Yamaha with missing fairings, I'd get laughed out the door.
I just need to psych myself up and get off my arse and clean them myself. It's not hard. I did my scooters carb and it wasn't hard. I'm just very fucking lazy. Hopefully after a good coma I'll get up and won't mind fixing this old beast.

[Katman]

Also read about carb balancing - rev it to 4,000 and hold it steady, so I tried it and they seem fine.

Say what???

[Maha]

Say what???

carb balancing = eat less potatoes.

[SNF]

carb balancing = eat less potatoes.

Heh, shouldn't be a problem I'm not much of a potato fan

Say what???

Read too many things and got mixed up I think. Anyway tank is basically empty now, so time to start cleaning.

[SNF]

Back together and running again! Ever slightest hesitation once or twice below 5,000 rpm but no bogging/stalling.

[Sliver]

Thoroughly bloody disappointing. Was having a great little ride on the FZR. Leading up to this it bogged down once taking off at a set of lights, came right and ran fine with tons of power and didn't do it again the rest of the day.
Today it did the same thing, bogged down. Then riding it, it gradually lost power and sounded like it was on 3 cylinders. The fuel pump makes a racket and when it does run it sounds..... well nothing like a smooth running 4 cyl sport bike should, runs and sounds like crap and dies. Can anyone suggest what it could be?

My guess is/was plugs and leads but it sounds really sick, like it could be something else I have no idea what. Thank you for rescuing me Glowerss. Would be keen to ride again, next time without breaking down.

i had the same problem with my 1992, i replaced the fuel pump and it went good after that.

[kiwi cowboy]

Back together and running again! Ever slightest hesitation once or twice below 5,000 rpm but no bogging/stalling.

If you need to clean the carbs the best stuff is white vinager.
search this site and you will find post on how and works a treat.

[FJRider]

If you need to clean the carbs the best stuff is white vinager.
search this site and you will find post on how and works a treat.

If you need to clean the carbs ... you need someone that knows what they are doing.

[SNF]

I cleaned my mates carb on his scooter and managed to get that going again. But yeah the bike ones would need a lot more work being 4 of them loll. I rode well over 100 km today and the bike seems fine. Funny thing is I hadn't pulled the carbs apart, merely drained the float bowls so that may have been the problem.

[SNF]

FUCK this thing! Seriously - I fix it - it fucks up. Yesterday it was fine today it runs 3 cylinders. Its either coils or fuel solenoid/pump. Next week its going for diagnostics, all 'basic' maintenance items have been put on/done. I half want to sell it but I don't want to unleash the curse of the yamacunt onto someone else. Burning it means no insurance. Fuck. Hopefully soon it will just work properly.

[Glowerss]

Sorry to hear about your ongoing troubles mate. Hopeing that it'll finally be sorted for you! Nothing worse then great riding weather and a broken bike ruining plot.



I'm fully going to bookmark this thread, however, and link it anytime people claim old IL4s are "fine"