FZR250, not revving

[Magua]

I charged the battery for my bike last night and tried to start it. The bike starts fine but will not rev and will only stay running if the throttle is held on. I took out the spark plugs and gave them a good clean as a few of them had become black and sooty. The spark plugs have recently been changed but the bike has been idle for atleast a month. Any help appreciated.

[Teflon]

Just a idea. Tap the carbs, floats could be stuck.

[Magua]

I'm going to go ahead and buy new spark plugs, $60 again.

[Magua]

I checked the plugs and we have spark, they are turning black again though. Running far too rich? I did not have the correct gaskets for the carb seal to cylinder, so I used gasket paper. I am now told that I needed to use gasket paper glue with that (thanks a fucking lot cyclespot "just make your own with gasket paper"). Could a not so tight seal be letting out the air?

[erik]

I'm no expert, but I think you should wait before spending cash on new spark plugs.
If it's running too rich, the gaskets probably aren't leaking, if they were it would make it run lean, I think.

Have you checked to make sure the throttle cables are hooked up properly and the butterfly valves all move when you twist the throttle (You'll have to hold the vacuum slide open to see the butterfly valve when you do this)?
What about the air filter and airbox, have you checked to make sure nothing is blocking them up?
All the spark plug leads going to the right plugs?

I'm a noob at fixing bikes, so I'm kinda just stabbing in the dark...

[Indiana_Jones]

I told him that it could be the carb, and he also failed to mention "we" cleaned the plugs.

-Indy

[Magua]

Have you checked to make sure the throttle cables are hooked up properly and the butterfly valves all move when you twist the throttle (You'll have to hold the vacuum slide open to see the butterfly valve when you do this)?

Butterfly valves? Umm. You wouldn't happen to have a picture would you?

[Magua]

Come on people, I need help. I need to get my bike running so I can continue fixing it.

[grantm]

If your plugs are showing signs of being rich ( black ) then they should clean up OK - this is not a two stroke that can oil then up - so dont go buying more plugs...it sounds as if it is too rich - is the choke staying on ? If the bike has been sitting for some time it may have sticky float levels / needls seats .....
Best you pull the carbs and check why it is doing this....oh , and if it was leaking air via the gaskets it would run lean , not rich ...
It is most likely stuck needle seats in the carbs / float levels
Is this bike ex Japan in its recent past - they often have green goo from their fule in the carbs that clog/ block / stick things ....

[erik]

Butterfly valves? Umm. You wouldn't happen to have a picture would you?

In the throat of each carb, down after the black plastic throttle slide thing and needle valve (I'm assuming it's the same or similar to the zeal's carbs), there's a round plate thing that moves to let more or less air into the engine when you turn the throttle.
If you're still unsure, search for "butterfly valve" in google in the image section, there are a hole heap of pics of them in all sorts of applications.
It's just a real basic check to make sure your twist grip is actually moving the right bits in the carbs.

[Magua]

I pulled back the black things and twisted the throttle, the butterfly things worked fine. Is that all I am meant to see move? Maybe the bike isn't getting enough petrol?

[Frankie]

I'm no expert, but I think you should wait before spending cash on new spark plugs.
If it's running too rich, the gaskets probably aren't leaking, if they were it would make it run lean, I think.
Really?


and if it was leaking air via the gaskets it would run lean , not rich ...
err? Its not getting enought fuel if the air isnt getting into it, thus runing rich? Unless you have a better idea

[Teflon]

Has it got a fuel pump?.

Are the filters blocked?.

Have you check the carbs for fuel?, should be a drain screw on the bottom.

[Magua]

Do you mean the fuel filter, hmmm. It's not the air filter as the bike still did not run without it.

[Frankie]

It worked okish... like ran and was ridable before the carb seals were changed...altho its been atleast a month since it was last started..

I say its because you are just using gasket paper, some gasket glue will be good for it, plus new fuel

[Magua]

Have you check the carbs for fuel?, should be a drain screw on the bottom.

What do you mean? Are they not meant to have fuel in them?

[erik]

That's all I meant to check.

Did you remember to cut holes in all the gaskets when you made them...? ;)

Has your bike got one of them exhaust valve things? (EXUP?)

Is it working properly? Maybe it's not opening?

[Frankie]

Did you remember to cut holes in all the gaskets when you made them...? ;)


haha yeah was my first question

[Magua]

Has your bike got one of them exhaust valve things? (EXUP?)

Is it working properly? Maybe it's not opening?

Exup, I didn't even think of it. If that's the problem then I'm coming after you frankie for playing with it.

[Teflon]

Exup, I didn't even think of it. If that's the problem then I'm coming after you frankie for playing with it.

Don't think it would be that. Even if the exup valves were fully closed, it should still idle, and rev.

[Frankie]

Exup, I didn't even think of it. If that's the problem then I'm coming after you frankie for playing with it.
I just took the cover off and put it back on...

[Magua]

Still not working, any ideas? Or an offer of help?

[inlinefour]

This forum is no place to get your bike fixed as there are plenty of armchair mechanics. Unless a proper mechanic can physically look at it and understand exactly what the original problem was and know exactly what you have tinkered with in the first place, then there is really no point in offering advice. The only real advice I will offer that I consider usefull if find a mechanic and explain what you have done to the machine and pay him or her to fix it. I've rebuilt many a 1970ish Honda inline four, but after looking at a brand new Fireblade and some of the more modern inline fours, v-twins etc, I'm fucked if I would touch them with a barge pole, let alone with a tool. Unless it is basic maintianance and even then I'd rather take it to a dealer. I think form what I have read and I apologise in advance if I'm wrong, but you have played bush mechanic and played with things you know little of?

Bugger! :brick:

[Magua]

I'm not the kind of person to tear into a bike without knowing what I'm doing. I only touched the bike after been told and shown what to do by someone mechanically minded. We all make mistakes, I missed a step which I can now remedy. Gasket Glue, I forgot about that. Thanks for the bad rep :niceone: .

[inlinefour]

I'm not the kind of person to tear into a bike without knowing what I'm doing. I only touched the bike after been told and shown what to do by someone mechanically minded. We all make mistakes, I missed a step which I can now remedy. Gasket Glue, I forgot about that. Thanks for the bad rep :niceone: .

If the carbs are not finely tuned then the bike will either run like an arse or not run at all. Its fine to make the mistake, I'm just trying to offer some relevant advice. Yea I know a little about bikes and unless your bike has some majour brainfart of an electrical system then yea I could fix it. BUT the point is that without being able to work on it, look at it and get all the relevant info then I seriously doubt if you will find a quick fix here dude. My bike crapped out in the weekend. I know enough to know what is wrong and what parts are required, oh and the important part. Where to take it to get the electrical problem fixed...

[Waylander]

Um... So if we are not suposed to ask advice on how to fix a bike what exactly is the point of this site Honda? Wern't you one of the ones commenting on how there was too much non-bike related stuff on here latley?


Plenty of peaple on here do actually know what they are talking about, though Honda does have a point in that some peaple who may not know exactly what they are talking about, you just need to find out which ones are for real wich isn't that hard. At least I hope so cause I'm gonna be askin for advice soon aswell.:2thumbsup

[inlinefour]

But I think perhaps a mechanic working on the bike in question might be in order?

[Waylander]

But I think perhaps a mechanic working on the bike in question might be in order?
Ok I take back what I said. Sufferin from bike withdrawl syndrom or somethin:confused:

[Magua]

Well if it doens't work after I try the gasket glue then I'm not touching it anymore, a mechanic can take it away then.

[inlinefour]

Like I said the carbs need to be will balanced and tuned to make the bike run well. Otherwise it'll run like an arse or not run at all. This I also learned the hard way at a younger age. I was lucky that I had a mechanic to ask questions every time I made a mistake (and yes I made plenty), but this allways required inspection of what I was doing first.

[craisin]

got given a RD350 years ago was doing a simular thing and the guy that gave it to me had the float bowls on the wrong carb as they were different as one had an extra tube for the choke Maybe :yes: :no:

[R6_kid]

is the fuel tap turned to on?

catches so many of us out.


why did you buy that FZR in the first place? I've seen so many better bikes for less than you paid for yours. And thats not including all the extra work done.