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Old November 6th, 2016, 02:54 PM   #1
acook3323
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One cylinder not firing

Hey guys I have a 2005 ninja 250 the California model with 6600 miles on it. I'm struggling getting the bike started. It has new plugs that have spark,timing has been checked and is good, cleaned carbs, and replaced battery, seems to have good compression from both cylinders. When I unplug the boot from the left side plug it starts and idles rough but I have no throttle response at all. When both plug boots are on it struggles to start up and seems to backfire. Has anyone had this issue or have any advice? Thanks
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Old November 6th, 2016, 05:01 PM   #2
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Just for fun, try switching the plug wires.


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Old November 6th, 2016, 05:24 PM   #3
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Thanks! Done that same result unfortunately.
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Old November 6th, 2016, 05:29 PM   #4
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.......... timing has been checked and is good.........
Welcome, Adam !!!

Do you refer to the timing of the valves?
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Old November 6th, 2016, 05:31 PM   #5
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Pulled cylinder head cover off checked cam timing marks and chain links and everything met spec
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Old November 6th, 2016, 05:35 PM   #6
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Pulled cylinder head cover off checked cam timing marks and chain links and everything met spec
Did you verified the gap of each valve was within specs?
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Old November 6th, 2016, 05:39 PM   #7
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Haven't as I don't really know how to do it because ive never had to do it! Is it simple to do?
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Old November 6th, 2016, 05:53 PM   #8
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Haven't as I don't really know how to do it because ive never had to do it! Is it simple to do?
It is something that should be done every 6000 miles.

It is easy if you have a shaded place to work and some basic tools.
This is how to:
http://faq.ninja250.org/wiki/How_do_..._the_valves%3F

http://n4mwd.blogspot.com/2013/06/ov...ts-during.html

Backfiring may be caused, among other things, by some loose electrical connector in the ignition circuit:
http://faq.ninja250.org/wiki/Wiring_...s_%26_diagrams

Having no throttle response at all sounds like broken diaphragms of the carbs or incorrectly installed needles:
http://faq.ninja250.org/wiki/How_do_...n_the_carbs%3F

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Old November 6th, 2016, 06:00 PM   #9
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Thanks for your help. We will see how it goes! Fingers crossed!
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Old November 6th, 2016, 06:03 PM   #10
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Thanks for your help. We will see how it goes! Fingers crossed!
You are welcome

A bonus:
https://www.ninjette.org/forums/showthread.php?t=151139

Those are basic things to check, just to achieve at least combustion inside the chambers: air, fuel, compression and a healthy reliable spark.
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Old November 6th, 2016, 06:05 PM   #11
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So with the now throttle response I pulled the diaphragms out and the spring on that side was bent and kind of screwed up could that be the issue there?
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Old November 6th, 2016, 06:11 PM   #12
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So with the now throttle response I pulled the diaphragms out and the spring on that side was bent and kind of screwed up could that be the issue there?
It could be.
Those diaphragms are activated by the vacuum of the engine and move those tapered needles up and down, which allows more or less fuel into the stream of air being drawn into the cylinders.

This is how the CV (constant velocity) carburetors work:

Link to original page on YouTube.

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