| Author |
Message |
    
Jace
| | Posted on Monday, June 20, 2011 - 08:39 pm: | 
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My 08 Buell blast is running hard not idleing will backfire in low gears and does not want to start. Is also makeing a poping sound from the airbox and leaking fuel into the airbox. My blast has a jet kit on it that has around 9000 miles on the kit. My bike has 14,500 miles on it. Tryed cleaning the carb today with no change. Please help!!! Thanks
Jace |
Therealjoshbrown
| | Posted on Wednesday, June 22, 2011 - 08:16 pm: |
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I'm having a similar problem with my 05 Blast. I changed out the gas and cleaned the carb, but it hasn't seemed to help. My bike will start up and idle fine, but when I roll on the throttle the engine bogs down and dies. Any ideas? |
Ezblast
| | Posted on Friday, June 24, 2011 - 04:34 pm: |
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Replace your intake couplings - Das Boot!
EZ |
Therealjoshbrown
| | Posted on Monday, June 27, 2011 - 03:51 pm: |
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I replaced the boot last summer so I didn't think I would need to do it again so soon, but I haven't really looked at it. I'll pull it off and take a look, but even if there isn't any visible damage could that still be the problem? |
Therealjoshbrown
| | Posted on Monday, June 27, 2011 - 09:54 pm: |
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I'm looking at the boot now and there is a white powdery build up inside under both hose clamps. It is more pronounced at the manifold-end, but is present at the carburetor-end as well. I don't see any cracks in the coupler, but maybe the powder is causing a problem. What do you think? |
Therealjoshbrown
| | Posted on Friday, July 01, 2011 - 05:09 pm: |
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Ok, I checked the spark plug and it had a black, sooty build up so I think I'm running rich. I checked the gap and it was only 0.03 instead of 0.038 to 0.043 so maybe that was part of the problem. I got a new spark plug and adjusted the gap to within tolerance and installed it, but I'm still having the same problem. When I checked the new plug there was some sooty build up again.
Does this mean my auto enricher is bad? Can I just adjust the air/fuel mixture on the carburetor as shown at http://www.nightrider.com/biketech/hd_cv_mods.htm or does that not pertain to my situation? I've been reading some old posts and other people with this problem have ended up taking there bike to the dealer and having the carb replaced, I'd rather not go that route. Thanks. |
Ezblast
| | Posted on Friday, July 01, 2011 - 11:50 pm: |
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Yes - I would question your enrichner.
EZ |
Therealjoshbrown
| | Posted on Sunday, July 03, 2011 - 01:22 pm: |
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Can I fix the enricher or do I need to replace it? Can I ride effectively without it? I've found a couple of posts that suggest I can but they say the the bike will "run fine but not idle", or something to that effect. |
Ezblast
| | Posted on Monday, July 04, 2011 - 03:02 pm: |
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It will be fine without it, however, starting will be a tad trickier, a lot of throttle feathering the first few minutes, till bike is warm then your fine. you would also loose a few miles per gallon. Replacing it would be advised or hit the carb section and use our instructions and create a manual choke.
EZ |
Therealjoshbrown
| | Posted on Tuesday, July 05, 2011 - 10:56 pm: |
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Ok I've disconnected the auto enricher and the bike is behaving the same. It will still idle and will die when I rev the engine. I've read through a bunch of older posts and it sounds like my problem may be the vacuum piston. I was watching a video on youtube of a guy working on a CV40 carburetor and he mentioned that if there is a leak in the vacuum the bike will idle, but will fall flat on it's face when revved.
I've taken the carb off again and have pulled the vacuum piston out and looked it over, but I din't notice any obvious problems. Could I have microscopic cracks that are compromising the vacuum too much? Is it possible to clean the rubber membrane? When reassembled the vacuum piston behaves like it is described in the service manual - a slight resistance to upward movement. Lastly if I need to replace the item where can I find it? The sites I've found only have gaskets and jets for sale, but no vacuum piston. Sorry for the wordy post, hope someone can help me. |
Ezblast
| | Posted on Tuesday, July 05, 2011 - 11:16 pm: |
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Make sure low jet is clean, best solution for that is to replace it with a 45 anyway for better ease of starting and idle and turn air screw 2 turns out from bottom. It takes a pinched or holed slide for it not to work - a flash light can tell that tale.
EZ |
Therealjoshbrown
| | Posted on Wednesday, July 06, 2011 - 12:33 am: |
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The slow jet is clean (I'm assuming that's what you meant instead of the low jet), but I'll order a 45 anyway. Is the air screw the one reached from the bottom of the carburetor that I have to drill a plate out to gain access to?
Just for clarification a pinched slide wouldn't allow the vacuum piston to move freely, which it does, so I don't think that's the issue. A holed slide means a perforation through the rubber part of the piston? Thanks. |
Ezblast
| | Posted on Thursday, July 07, 2011 - 12:10 am: |
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Yes on the slide, yes the airscrew has a sauder plug over it, so be careful - use only like the 1/8" tip of the bit. Make sure vent line is not clogged or kinked, check exhaust header mount area - make sure evenly mounted and no exhaust leak.
EZ |
Therealjoshbrown
| | Posted on Thursday, July 07, 2011 - 01:04 pm: |
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Ok I checked the vacuum piston - I didn't see any visible damage to the rubber membrane and the slide moves smoothly. I readjusted the a/f mixture and I ordered a 45 jet.
Thanks for all the help so far. After much ado I'm somewhat embarrassed to say that this last time of inspecting the jets I finally realized that the needle jet is missing from my carburetor. It must have fallen out quite a while ago and it explains why my bike will idle but will die when revved. I've ordered a new one and it should arrive whithin a couple of days. I'll leave an update after I've installed it. |
Therealjoshbrown
| | Posted on Wednesday, July 20, 2011 - 01:23 am: |
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Success! I installed the new needle jet last night and the bike runs great. Thanks for all the help. |
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Buell Blast not idleing backfireing and not starting