Backfire/Misfire at WOT - Runs well at low rpm & idle - Buell Forums: Buell Motorcycle Forum
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post #1 of 2 (permalink) Old 07-12-2014, 08:25 PM Thread Starter
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Join Date: Jul 2014
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Backfire/Misfire at WOT - Runs well at low rpm & idle

Newb to the Blast and bikes in general, not a mechanic by trade but I'm pretty motor savvy. I appreciate any and all help/comments in advance. THANKS BC!

Purchased a 2005 Blast a week ago and it idles and runs well at half throttle. When you go over 1/2 throttle to WOT it loses power, pops from the intake/carb area as well as the exhaust. This occurs in Neutral as well as gears 1-5. Previous owner wasn't too knowledgeable so I didn't get much info from him apart from the bike was sitting a little less than a year and received an oil change around the same time.

2005 Buell Blast
1825 Miles
Recently changed oil & filter
Have a copy of the Service Repair Manual

We've taken the carb off half a dozen times, inspected, cleaned it.
Checked the Gas but seems to be fine- doesn't smell bad or dirty.
Spark plug is in tact and looks clean and new.
Intake doesn't seem to be the issue
Doesnt seem to be dropped
No oil leak coming from the rocker or manifold (cleaned the area and ran the bike for a while to confirm)

Seems to be a vacuum/air leak
Bike dies when spraying carb cleaner where the intake manifold meets. (could it be a bad gasket?)

Again i appreciate everyone's help in advance, I'm at wits end trying to find the solution to having this bike run properly half way into riding season. Cant wait to ride the Blast when its running right!
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post #2 of 2 (permalink) Old 07-21-2014, 08:37 AM
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Join Date: Jul 2012
Location: southern MD
Posts: 53
fix the air leak, check timing , be sure the exhaust is clear,and sealed...check entire intake tract/filter element. Let us know what you found

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