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Old February 25th, 2019, 09:06 PM   #1
Darksik
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Too much air to the carbs?

Hi guys, I previously commented that I had a problem with my ninja, since I removed a piece of paper that obstructed a hole in the snorkel, the motorcycle made many explosions and i need to open more the throtle, I thought that the spark plugs could be dirty with oil, I changed the spark plugs and I put a K & N filter thinking that could be that problem, I put the piece of paper back to the snorkel and the motorcycle accelerated better, as before removing the piece of paper, the mechanic said that maybe the carburetors are not calibrated
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Old February 25th, 2019, 09:30 PM   #2
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Well many people here are more knowledge than I with respect to engines, but it sounds to me like you're running way too lean. Probably need to clean the carbs, unless they've been rejetted to be too lean.
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Old February 25th, 2019, 10:22 PM   #3
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Yup, clogged carbs need complete removal, disassembly, and thorough cleaning.

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Old March 1st, 2019, 08:38 AM   #4
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@Darksik -

As you are running a factory airbox, its safe to say you've got optimum air flow, pressures, etc....as dictated by airbox capacity and configuration to work in conjunction with the supplied CV carbs. I'd tend to trust the capabilities of those Kawasaki design engineers, tasked with meeting emissions standards, performance, fuel consumption and within economical goals. I'll go on record stating they did a pretty darn good job.

As Kawasaki sold a ton of 250's worldwide over a long production period....i'd further commend them with a corporate "mission accomplished!".

That said, you HAVE received valid info above by members @Ralgha and @DannoXYZ on needing to fully review fuel delivery and carburetor function and cleanliness.

As the airbox is (basically) a fixed entity...the fuel system (carbs) are, in fact, prone to negative influences.... restriction, maladjustment, weather, effects of poor fuel.... on and on.

Get the paper out of the airbox, properly clean and adjust them carbs and RIDE!
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Old March 1st, 2019, 08:42 AM   #5
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Originally Posted by ducatiman View Post
@Darksik -

As you are running a factory airbox, its safe to say you've got optimum air flow, pressures, etc....as dictated by airbox capacity and configuration to work in conjunction with the supplied CV carbs. I'd tend to trust the capabilities of those Kawasaki design engineers, tasked with meeting emissions standards, performance, fuel consumption and within economical goals. I'll go on record stating they did a pretty darn good job.

As Kawasaki sold a ton of 250's worldwide over a long production period....i'd further commend them with a corporate "mission accomplished!".

That said, you HAVE received valid info by members on needing to fully review fuel delivery and carburetor function and cleanliness.

As the airbox is (basically) a fixed entity...the fuel system (carbs) are, in fact, prone to negative influences.... restriction, maladjustment, weather, effects of poor fuel.... on and on.

Get the paper out of the airbox, properly clean and adjust them carbs and RIDE!
About that theme of adhust the carbs is to move the "carb sync adjuster screw"?
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Old March 1st, 2019, 09:21 AM   #6
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amongst many other tasks involved, yes.

Urge you to NOT experiment with synch, until the carbs are truly cleaned first. Don't do an "end run".
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Old March 1st, 2019, 01:05 PM   #7
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Quote:
Originally Posted by Darksik View Post
About that theme of adhust the carbs is to move the "carb sync adjuster screw"?
That's the one part you don't want to touch. Leave that alone. But disassemble down to these parts and clean each one well.



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Old March 2nd, 2019, 10:32 AM   #8
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That's the one part you don't want to touch. Leave that alone. But disassemble down to these parts and clean each one well.
The mechanic told me the problem was the diaphragms, he told me by telephone, the diaphragms were bad installed also one piece of the diaphragm was cut, i don't know how
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