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Misfire at steady throttle openings

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Stevie Gimo
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Misfire at steady throttle openings

Post by Stevie Gimo on Fri 09 Mar 2018, 8:21 pm

Got a misfire at steady throttle openings (2000rpm) changed the plugs for irridium / changed to coil stick as an upgrade (thanks ANDYC).
If I hold the throttle at a steady 2k for instance after a few secs I get a misfire & the rev counter drops ever so briefly & instantly returns back to 2k.
Also tried at 2.5k & 3k to, same issue, however on power & accelerating it works just fine......
Any ideas where to look at next?
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ANDYC
the 900
the 900

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Location : Windsor

Re: Misfire at steady throttle openings

Post by ANDYC on Fri 09 Mar 2018, 8:31 pm

Have you tried cleaning out the float bowls on the carbs?
I had a similar problem many years ago, it turned out to be a piece of debris that had accumulated over time.
On a steady throttle it would rise up and block the main jet, as the demand through the jet lessens it would settle to the bottom again.
Well worth a look Steve.
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Beresford
the 900
the 900

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Location : not that far from Kirkistown

Re: Misfire at steady throttle openings

Post by Beresford on Fri 09 Mar 2018, 8:48 pm

@ANDYC wrote:Have you tried cleaning out the float bowls on the carbs?
I had a similar problem many years ago, it turned out to be a piece of debris that had accumulated over time.
On a steady throttle it would rise up and block the main jet, as the demand through the jet lessens it would settle to the bottom again.
Well worth a look Steve.
I have a friend with a historic rally VW Beetle, and this happened. He had tried changing the whole ignition system, jets, fuel pumps and lines and cleaning the tank. It nearly drove him into the asylum before he found the fault !
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Stevie Gimo
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Re: Misfire at steady throttle openings

Post by Stevie Gimo on Fri 09 Mar 2018, 9:08 pm

I'll check on the carbs tomorrow, thanks
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Stevie Gimo
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Posts : 37

Re: Misfire at steady throttle openings

Post by Stevie Gimo on Sun 11 Mar 2018, 6:01 pm

Well, carb float bowls cleaned out now, yes they were a bit of a mess in there too. Took it out for a good run today, it improved the more it was ridden. By the time I returned it was running really well, no misfire evident what so ever.
So another little niggle sorted ready for the summer  Very Happy
Thanks for your help again Andy, you nailed it.
Need to spend some time on the CB250G5 engine rebuild now, that should be ready to install in the next week or so.......
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Jameshambleton
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Re: Misfire at steady throttle openings

Post by Jameshambleton on Sun 11 Mar 2018, 6:37 pm

Yipiee - glad you've got it sorted out
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ANDYC
the 900
the 900

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Location : Windsor

Re: Misfire at steady throttle openings

Post by ANDYC on Sun 11 Mar 2018, 7:12 pm

Glad to be of service Very Happy

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Re: Misfire at steady throttle openings

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