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#1
04-16-2011, 10:05 PM
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Backfire
Hello all:
I'm new to the site and already have a question! My son has a Dune 150 that didn't get ridden much last year. When we tried to start it this year, we had fuel issues from bad gas. The needle valve was gummed-up, so I installed a new carb. It fired up, bur backfires through the carb. I can't see any cracks in the intake, and checked valve clearances which were OK. I'm starting to get frustrated. Any ideas? Thanks in advance for your help! |
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#2
04-17-2011, 12:21 AM
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Your probably jetted too lean. most carbs come factory jetted for scooters which use smaller jets and/or are leaned out to pass by the polution police. Especialy if you got a e-bay item. Use the main and pilot jet from your old carb. See if this helps.
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#4
04-17-2011, 08:21 PM
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Well, we finally figured it out. One of the wires going to the coil was partially unplugged. It was a simple fix to crimp the terminal a little, but it took me a long time to figure it out. Thanks for the help!
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