1991 ZXR250 hesitating at 14,000 rpm

[husaberg]

Yea i understand what you mean by diagnosing it by the internet, Well i'll clean the carbs and if its still happening i'll take it to a professional. Thanks bro

when you are doing the carbs have a good look for air leaks seal as nes with some silicone if they are cracked

[bungbung]

Look for leaks in the vacuum pipes that feed the vacuum side of each of the slides, it's a common place to fail now the rubber is 20 years old.

[ducatilover]

fueling. Set your floats higher.

Unlikely at 14,000rpm. But you'd have a faggy flatspot at 3-4000

Has it got a standard exhaust and air filter?
Is the filter clean?
Are the plugs in good nick?
All sealing surfaces on the intake sweet? (as already said, the ram tubes are not real on them)
If yes to those, it's time to play carb games

Hard starting hot, or cold? When were the valve clearances done and the last carb sync?
Also, will it actually rev past 14?

[Darealsytfromdagheto]

Unlikely at 14,000rpm. But you'd have a faggy flatspot at 3-4000

Has it got a standard exhaust and air filter?
Is the filter clean?
Are the plugs in good nick?
All sealing surfaces on the intake sweet? (as already said, the ram tubes are not real on them)
If yes to those, it's time to play carb games

Hard starting hot, or cold? When were the valve clearances done and the last carb sync?
Also, will it actually rev past 14?

Hey, it has standard filter and aftermarket tyga tip. I haven't checked the filter. Plugs were replaced recently. I haven't had a chance to look at intakes yet. Its hard to start hot and cold sometimes. I had been riding my bike about a hour and went to restart it straightaway and it wouldn't start for like 5 minutes. It probably would keep reving past 14,000 but really doesn't want too

[ducatilover]

Tyga muffler? First off it'll need a re-jet anyway.
Try get it past 14k in 2nd or 3rd. If it does not go past, check the pink wire on the cdi unit is not cut or has a resistor to ground installed. Then check the 3 wire plug on the back of the speedo is connected.

[Darealsytfromdagheto]

Tyga muffler? First off it'll need a re-jet anyway.
Try get it past 14k in 2nd or 3rd. If it does not go past, check the pink wire on the cdi unit is not cut or has a resistor to ground installed. Then check the 3 wire plug on the back of the speedo is connected.

Okay ill check now bro, is the cdi under the seat? and its in 2nd and 3rd that it wont go past

[ducatilover]

Will it go past in other gears? Yeah under there somewhere man.

[Darealsytfromdagheto]

Will it go past in other gears? Yeah under there somewhere man.

I don't think it will go over in other gears, i havent really tried in higher gears, it gets around the 14,000rpm and it sounds like its hitting limiter or pops real fast

[mossy1200]

Is your speedo connected?

Does it have a low fuel light or fuel level indicators.?

Does it have a fuel pump?

[Darealsytfromdagheto]

Is your speedo connected?

Does it have a low fuel light or fuel level indicators.?

Does it have a fuel pump?

Yes speedo is connected, no fuel light or fuel level indicators, i don't think it has a fuel pump. I checked the pink wire on the cdi and all the wires seem intact

[mossy1200]

Yes speedo is connected, no fuel light or fuel level indicators, i don't think it has a fuel pump. I checked the pink wire on the cdi and all the wires seem intact

Are there any wires coming from the tank base?
Some bikes that age go into limp mode when fuel level is lower or if has a faulty sensor then all the time.
If there is wiring harness coming from tank base trace it to the plug and unplug it.

[Darealsytfromdagheto]

Are there any wires coming from the tank base?
Some bikes that age go into limp mode when fuel level is lower or if has a faulty sensor then all the time.
If there is wiring harness coming from tank base trace it to the plug and unplug it.

Not that i can see bro, there looks to be some sort of a small leak around the reserve switch.

[ducatilover]

They have a 180k limiter and if the pink wire to the cdi gets the wrong resiatance or an open circuit they cut cyl #'s 2/3 at 14,000rpm.
There should be voltage present between the pink wire and ground, and should be lower than battery voltage.

As far as I remember there is no fuel pump on one, or level sender.

[Darealsytfromdagheto]

They have a 180k limiter and if the pink wire to the cdi gets the wrong resiatance or an open circuit they cut cyl #'s 2/3 at 14,000rpm.
There should be voltage present between the pink wire and ground, and should be lower than battery voltage.

As far as I remember there is no fuel pump on one, or level sender.

Okay that sounds like a real possibility, how would i check if it has the wrong resistance?

[ducatilover]

Multimeter. I'd check voltage.
Usually a cheap 12v led will have a resistor on it and is the right resistance to sort the issue, so chop that wire and put the led from the cdi to ground.
Has worked for me several times.