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Author Topic: Bad Misfire on 2011 Bullet 500..need help  (Read 485 times)

loganconnell

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Bad Misfire on 2011 Bullet 500..need help
« on: May 15, 2014, 07:24:42 PM »
I've changed the plug and still didn't get rid of the misfire. The plug i am using is an NGK BPR6ES with a .28 Gap. Not sure what to do at this point, i haven't had the bike for long. Ive checked out the air filter and it looks clean. Any suggestions are greatly appreciated. thanks

Mr.Mazza

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Re: Bad Misfire on 2011 Bullet 500..need help
« Reply #1 on: May 15, 2014, 08:11:36 PM »
Is your spark good and strong?
Have you checked your points?
Is it old fuel? Stale fuel can misfire due to loss of octane.
Lizzy - 07 500 Deluxe ES - Red and chrome

loganconnell

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Re: Bad Misfire on 2011 Bullet 500..need help
« Reply #2 on: May 15, 2014, 08:32:47 PM »
Plug is brand new, not sure about points or how to check? fuel is new also.

cyrusb

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Re: Bad Misfire on 2011 Bullet 500..need help
« Reply #3 on: May 15, 2014, 08:49:41 PM »
no points ?

tooseevee

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Re: Bad Misfire on 2011 Bullet 500..need help
« Reply #4 on: May 15, 2014, 08:51:52 PM »
Is your spark good and strong?
Have you checked your points?
Is it old fuel? Stale fuel can misfire due to loss of octane.

            Points? There were still some points in 2011?
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ace.cafe

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Re: Bad Misfire on 2011 Bullet 500..need help
« Reply #5 on: May 15, 2014, 09:32:15 PM »
There are no points in a 2011 UCE bike.
This is simply another case of the "classic" moniker confusing the new bikes with the old.
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ERC

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Re: Bad Misfire on 2011 Bullet 500..need help
« Reply #6 on: May 15, 2014, 09:51:55 PM »
Ace is correct on that. Everything is electronic on the later ones.  ERC
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Arizoni

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Re: Bad Misfire on 2011 Bullet 500..need help
« Reply #7 on: May 15, 2014, 10:51:51 PM »
loganconnell
You didn't say much about when the misfire is happening.

Is it when it's sitting there idling or when your accelerating hard or when you are just cruising down the road?

Please describe exactly when your bikes engine is misfiring.

If it is when your just cruising down the road it might be the sidestand safety switch that's causing it to misfire.
It did on my 2011 and as soon as I disconnected it the problem went away.

If some crummy fuel was used the fuel injector might be partially plugged.  That can cause a misfire during idling or when accelerating.  Some good fuel injector cleaner added to a tankful of fuel can fix that problem if it exists.

Loose or partially plugged in wiring connectors can cause the problem.  The first one that comes to mind is the one on the wires that come out of the right side engine cover and plug in back by the seat downtube on the frame.
A broken ground wire on the negative battery post can cause all sorts of strange electrical issues.  The connector is under a rubber cover which can hold the broken parts together (or not).
Jim
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1999 Miata 10th Anniversary

loganconnell

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Re: Bad Misfire on 2011 Bullet 500..need help
« Reply #8 on: May 15, 2014, 11:16:01 PM »
It misfires pretty hard in 2nd and 3rd and not to much in 1st and 4th. idles fine, no misfire while idling, ill try the side stand switch and see what happens.

rvcycleguy

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Re: Bad Misfire on 2011 Bullet 500..need help
« Reply #9 on: May 16, 2014, 12:34:41 AM »
I've had a coil misfire under load. 
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neil

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Re: Bad Misfire on 2011 Bullet 500..need help
« Reply #10 on: May 16, 2014, 07:16:15 PM »
Hi Logan:
I recently did some cleaning on my Bullet Iron Barrel and accidently loosened the high tension lead where it exits from the coil. It mis-fired during a ride I went on thereafter. I checked it over and reset the lead into the top of the coil and - - - no further misfiring. I don't know if your bike is equipped with a coil but if it is, that's a good place to start.

Neil and Buzzy the Bullet.

1 Thump

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Re: Bad Misfire on 2011 Bullet 500..need help
« Reply #11 on: May 16, 2014, 09:40:59 PM »
The BPRS is a projected tip plug. It can advance the timing. Is that the recommended plug ?

barenekd

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Re: Bad Misfire on 2011 Bullet 500..need help
« Reply #12 on: May 16, 2014, 09:51:19 PM »
The BPR6ES is the plug that works best in a 2011 and later ECU bike.
I'd have to go with a loose connection, starting with the sidestand switch. Everybody likes to blame REs for this malfunction, mine even did it, but I  had a Yamaha Fazer that did the same thing. 
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loganconnell

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Re: Bad Misfire on 2011 Bullet 500..need help
« Reply #13 on: May 16, 2014, 10:51:30 PM »
Alright well it looks like the side stand switch was already disconnected from the previous owner. Now ill look into the coil.. Is the Coil directly above the spark plug?

Arizoni

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Re: Bad Misfire on 2011 Bullet 500..need help
« Reply #14 on: May 16, 2014, 11:02:44 PM »
That's the general area to find the coil in.
It's under the fuel tank :)
Jim
2011 G5 Deluxe
1999 Miata 10th Anniversary