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Old March 26th, 2019, 08:11 PM   #1
alexhart
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250 Sputters and lags on acceleration at speed?

So I have come across a problem and as a newbie I still don't even know where to begin.

The bike seems to lag or stutter when I go full throttle when I'm cruising. I'll be going along in 2nd gear or 3rd then gun the gas and it like skips a beat until I shift gears again.

This may be relevant but the idling is wonky, it sits really high and when I turn the idle screw a little down it will bog out the engine and maybe die or sit until revved again.

Could it be carb? The gent I just bought it from said that it had been sitting for a minute as he didn't ride it.

Any thoughts on what it might be? Any help would be much appreciated! I've never cleaned a carb before so if there's an easy way to check if it's that before taking the whole thing apart, any tips would be awesome.
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Old March 27th, 2019, 08:00 AM   #2
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Quote:
Originally Posted by alexhart View Post

The gent I just bought it from said that it had been sitting for a minute as he didn't ride it.

Could it be carb?
huh?

yes, very likely
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Old March 27th, 2019, 05:21 PM   #3
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Yes, you need to examine carbs closely. Symptoms indicate insufficient fuel delivery, most likely due to clogged carb fuel-circuits. As a test, you can try limiting air-flow to countre-act lack of petrol when going full-throttle. Read this thread and the linked ones within.

https://www.ninjette.org/forums/showthread.php?t=331186
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Old March 28th, 2019, 07:10 AM   #4
alexhart
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Quote:
Originally Posted by DannoXYZ View Post
Yes, you need to examine carbs closely. Symptoms indicate insufficient fuel delivery, most likely due to clogged carb fuel-circuits. As a test, you can try limiting air-flow to countre-act lack of petrol when going full-throttle. Read this thread and the linked ones within.

https://www.ninjette.org/forums/showthread.php?t=331186
I so took apart the carbs and everything and they were already SPOTLESS! So now I am stumped. I am going to get more carb cleaner today to try and blow out the individual jet holes to see if he just did a poor job cleaning them. I have new spark plugs on the way as well so we will see.

Any other suggestions if it wouldn't be the carb?
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Old March 28th, 2019, 07:38 AM   #5
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The passage ways in a carburetor are extremely small. Just looking is not a way to ensure your carbs are clean. Even an ultrasonic bath will not always get the crud out. Fine wires, carb cleaner and air will after a good ultrasonic bath. I also use q-tips.
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Old March 28th, 2019, 07:44 AM   #6
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fuel delivery issue?
*tank vent?
*petcock?
*air restriction (filter, intake snorkel?)

you never clarified the "sitting for a minute" statement.

Visually "spotless" is positive, but does not necessarily indicate clarity of circuits, fully justifying your confirming.

Just who cleaned these carburetors...the previous owner?

Did the bike ever run correctly during your ownership?
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Old March 28th, 2019, 05:15 PM   #7
DannoXYZ
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Quote:
Originally Posted by alexhart View Post
I so took apart the carbs and everything and they were already SPOTLESS! So now I am stumped. I am going to get more carb cleaner today to try and blow out the individual jet holes to see if he just did a poor job cleaning them. I have new spark plugs on the way as well so we will see.

Any other suggestions if it wouldn't be the carb?
Modern carb cleaners are worthless. You need complete disassembly, mechanical flossing of all jets and fuel-circuits with wire, hours in ultrasonic cleaner along with soda-blasting @ 100000psi.
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