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Discussion Starter #1
I have a 93 cbr 600 f2 and at high rpm's, the bike starts to surge and make a popping sound like it is missing. When i get the bike up to high speeds, it began to surge. under normal condition, the bike runs fine (speed limit). can someone lend me a helping hand? thanx
 

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I have a 93 cbr 600 f2 and at high rpm's, the bike starts to surge and make a popping sound like it is missing. When i get the bike up to high speeds, it began to surge. under normal condition, the bike runs fine (speed limit). can someone lend me a helping hand? thanx

Is it at the same rpm regardless of which gear you're in?
How old are your plugs?
 

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yes, it starts about the same rpm no matter which gear. I change the spark plug last year.

Last year really doesn't help :)
How old in mileage are the plugs?
The bike just started doing this for no reason, it was running fine before?
It sounds like perhaps it's going lean at a specific point.
What rpm is the problem at?
Is it only a problem under full throttle or even slight throttle causes it to stumble?
Is the fairing and intake ducting all correct?
 

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I think bladeracer has it and it is running lean which could be your main jets? Have you done any mods to the bike or has it been sitting for a while. Is it just at high speed as BR says? what rpm is it happening at?
 

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Discussion Starter #6
i bought the bike like this. i thought that it was the plugs and i replace them last year. i have not put very many miles on it. when i get it up around 4500 rpm it began to miss, or when i get the speed up around 115 to 125 mph i can feel the surge. can the lean problem be fix easily or do i need to seek professional help?
 

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You could have a look at checking/syncing the carbs, checking all your fuel and air hoses and filters. I believe that the F2 is gravity feed and does not use a fuel pump. Does it surge all the time, every time? Does it have any mods on it? Exhaust, ignition retard?
 

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Would removal of fairing cause a bike to go lean?

Not necessarily but if the fairing directs air to the airbox or it has any tubing to the airbox it can cause all sorts of problems if you remove it. My ZX6R doesn't like to pull over about 140kph without the air ducting and a mate's F3 behaved similarly.
 

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i bought the bike like this. i thought that it was the plugs and i replace them last year. i have not put very many miles on it. when i get it up around 4500 rpm it began to miss, or when i get the speed up around 115 to 125 mph i can feel the surge. can the lean problem be fix easily or do i need to seek professional help?

It depends on what is causing it.
If something has been deliberately altered (like the airbox, compression ratio or exhaust system) that requires rejetting and it's never been done, then you'd probably do better to take it to a tuning shop, ideally one with a dyno.
If it was jetted just fine but something has changed, then that's likely to be easier to fix. You need to ensure there are no air leaks in the intake system for a start. Also check the air filter is clean and properly sealed.
If possible do a run at 4500rpm while it's surging and immediately cut the engine, pull over and pull the plugs to see if they're indicating an overly rich or lean condition.
You can also tape over half of the air intake and see if that makes a noticeable difference. If it improves then it's definately too lean. Tape it securely though, you don't want to suck the tape into the intake.

I assume you are running fresh fuel?
 

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Discussion Starter #11
i did add a new jardine muffler. But i replace the vance and hines. Also add some wire mesh over the air intake in the fairing. I also remember spraying some starter fluild around the air intake and the motor increase in rpm slightly. I will go back and check all these sugestion and see if i can come up with a reason. If not i will have to seek professional help. thanks
 

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Not necessarily but if the fairing directs air to the airbox or it has any tubing to the airbox it can cause all sorts of problems if you remove it. My ZX6R doesn't like to pull over about 140kph without the air ducting and a mate's F3 behaved similarly.

Ahh all right makes sense.

I was just curious cause with my 99 900RR, no fairing, it now has issues doing highway speeds 70mph. I have to give it more throttle to keep it running properly. If I let off, then roll back into it the bike will sputter.
 

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the older hondas had a flapper system in the ram air box (f3, etc). if you disable or remove it, the bike will run like crap at higher rpms for some reason. my friends f3 stuntbike did it. i dont know if he re-jetted it, he ended up selling it for a newer bike before i ever got a chance to look at it. also, if your bike has been sitting, that isnt helping the situation, but generally the pilot jets will clog first.
 

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91 cbr 600f2 did the same thing at 4500 rpm so i cleaned my carbs and had the synced then put in an in line fuel filter which has helped a lot due to the need for a tank but they are $926 and i cant afford so do what i did and u should be fine


its nice to answer questions about the same issue i had
 

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It could be many things. Best bet is to take it to a reputable shop and pay to have a professional run some tests and pinpoint the problems. :)
 

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the older hondas had a flapper system in the ram air box (f3, etc). if you disable or remove it, the bike will run like crap at higher rpms for some reason. my friends f3 stuntbike did it. i dont know if he re-jetted it, he ended up selling it for a newer bike before i ever got a chance to look at it. also, if your bike has been sitting, that isnt helping the situation, but generally the pilot jets will clog first.

There is no flapper system in the air box. There is a pair valve that helps with the air flow to the carbs but def no flapper.
 

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There is no flapper system in the air box. There is a pair valve that helps with the air flow to the carbs but def no flapper.
I don't recall any flapper on my mate's '98 F3 either. I don't recall any moving parts at all in the intake or airbox.
The PAIR system is for emissions, it doesn't help airflow to the carbs.
 

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I don't recall any flapper on my mate's '98 F3 either. I don't recall any moving parts at all in the intake or airbox.
The PAIR system is for emissions, it doesn't help airflow to the carbs.

How would it help with the emissions. :idunno: The two air tubes on the front left and right of the nose cone plumb into the pair valve and then it plumbs into the carbs. Not sure how this would help with emissions. :idunno: When you turn the key you can hear a slight pop where the valve opens.
 

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How would it help with the emissions. :idunno: The two air tubes on the front left and right of the nose cone plumb into the pair valve and then it plumbs into the carbs. Not sure how this would help with emissions. :idunno: When you turn the key you can hear a slight pop where the valve opens.

The PAIR system simply draws fresh air from the airbox when the engine is producing vacuum and injects it directly into the exhaust ports to dilute the exhaust gases and promote more efficient combustion.
I do remember the tubes but I don't recall them going to the PAIR valve. Don't they go to a balance chamber or something?

EDIT: Thinking about it some more, I don't recall his bike even having the PAIR system. It's unusual to see bikes here that have it so I'm sure I'd remember if it did.
 
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