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Old 12-10-2010
tx71nova
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tx71nova's Info
 
Join Date: Dec 2010
Location: ham lake,mn
Posts: 20
Default 90 jag backfiring??

my friends 1990 440 jag afs is backfiring at idle. well it might not be a back fire since its not that loud.

the idle is set at about 1800 rpms and when it back fires the rpms jump up to 2000 and then it drops back down to 1800 until it backfires again.

it dosent backfire above 3000 rpms, so it actually backfiring or is it something else? thanks
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2000 polaris xc sp 500 with 144 track with WPS rail extensions, custom tunnel extension, boost bottle, dial a jets, 4 inch handle bar riser and bar hooks, extra idler wheels and custom mounted led atv tail light and custom gas can holder
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