| Author |
Message |
    
Turbodreaming
| | Posted on Friday, August 15, 2014 - 10:13 am: | 
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Hi everybody, I purchased my blast about 4 months ago and have been trying to get it running properly since. When I got the bike it was running rich with the air filter in but ran well with it out just had this randomly occurring back fire. I had it serviced at a local shop and they adjusted the auto choke and got it running with the air filter but the backfire persisted. They have since replaced the boot but the problem remains, also the initial throttle response feels sluggish. Any ideas or help would be greatly appreciated. |
Readyxb
| | Posted on Saturday, August 16, 2014 - 11:27 pm: |
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Hi Turbo - is the backfire going out the exhaust or the intake?
The first thing I would check is the ignition module, especially with the sluggish response you mentioned. A service manual for your model will have the details on how to check the module and cam position sensor. You can also check/tighten all grounds related to the ignition, and any connectors to/from the coil and ignition module. |
Turbodreaming
| | Posted on Sunday, August 17, 2014 - 10:26 am: |
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Thanks ready I'm a noob at this any idea where I can get a service manual
Thanks |
Turbodreaming
| | Posted on Sunday, August 17, 2014 - 10:28 am: |
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Oh and it seems to be coming from the exhaust |
Readyxb
| | Posted on Monday, August 18, 2014 - 09:00 pm: |
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Exhaust - ok. If the ignition spark fails to happen even on one cycle, unburnt fuel gets expelled into the exhaust. Then, on the next cycle, when the ignition fires and the exhaust valve opens, the exiting flame ignites the unburnt fuel in the headers and muffler causing the backfire. This is only one possibility of many. Even bad fuel can cause this phenomenon.
99492-00Y is the 2000 Blast Service Manual part#. They are not cheap! Several of the site sponsors sell them, and any H-D dealer can order them, and with patience you can find used ones on e bay for a decent price.
Things you can do without a manual:
- verify ignition coil is securely mounted
- inspect spark plug for carbon or oil fouling
- inspect spark plug cable for cuts or cracks
- re-plug ignition module connector |
Reepicheep
| | Posted on Monday, August 18, 2014 - 09:11 pm: |
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Got access to an oscillascope? Makes it easy to check the cam position sensor. |
Turbodreaming
| | Posted on Tuesday, August 19, 2014 - 07:28 pm: |
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Where do I locate the ignition module? |
Froggy
| | Posted on Tuesday, August 19, 2014 - 07:31 pm: |
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They are available new from a Buell dealer for about $20, part number Y0300.T |
Readyxb
| | Posted on Tuesday, August 19, 2014 - 11:57 pm: |
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The ignition coil is somewhere on the left side below the fuel tank.
The ignition module is behind the timing cover on the lower right-hand engine side, so you could trace the wire coming out of there to the connector. |
Turbodreaming
| | Posted on Wednesday, August 20, 2014 - 08:20 am: |
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Thanks a lot everyone. Fingers are crossed we'll give it a shot. |
Moreejtyahoocom
| | Posted on Friday, October 31, 2014 - 06:07 pm: |
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Did you ever figure this out? I have had these random backfires since I wrecked the bike and had a larger jet put in at the dealer (had the dealer fix some stuff and they suggested it). I changed the spark plug which definitely gave me some pickup but the backfire still happens. Other things that seem to affect it are:
* lower gas levels
* holes in exhaust pipe
When I remedy these other situations it gets better but never goes away. I'll look into the ignition coil thing.
(Message edited by moreejt@yahoo.com on October 31, 2014) |
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2000 buell blast random backfire