02-28-2008, 07:41 PM
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Senior Club Cobra Member
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Join Date: Feb 2006
Location: Crosby,
TX
Cobra Make, Engine: BDR #621, Keith Craft 408
Posts: 476
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Not Ranked
275 miles
Ok, I'm going to try a few more changes and then I'll find a pro in the Houston area. Spitting and popping still. Turned the idle mixture screw out 3/4 turn and changed from 60 idle jets to 70. Cleaned it up nicely. Put the stack screen on and spit and popped. Took the screens off and ran better. Tonight i got in and it spit and backfired all night. DAMN, I didnt do anything. Me and a buddy have been reading the tech stuff and will try a few more things this weekend.
If anyone has experienced similar situation let me know what to try next. The stack screens will restrict the air flow. What needs to be changed to overcome that? I don't want to run without any air filtration, just doesn't sound right. Am I nuts??? I haven't lost interest in the Webers, trust me, when you get into the throttle, it slams you back in the seat and flies. Big difference from my 306 (375 hp) to the 408 (511 hp).
Well, more test and tune this weekend and probably the 500 mile checkup and oil change. I'll keep everyone posted.
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