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Old 01-31-2010, 01:45 PM
workinpr0gress workinpr0gress is offline
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Join Date: Jun 2009
Posts: 601
Default Re: Bad Fuel Pump??

I would start with an original shop manual, multimeter, and a compression guage. It could be a lot of things really. Many a high speed problem can be attributed to an electrical problem like a timer base, rect., power pack, stator, temp... etc. I have seen coil packs do something very similar at higher rpms also, from old wires arcing or the pack being weak, or corrosion. If it is ultimately a fuel problem then I would take it back to the person who did the carbs. The float height is a straight forward thing. All that said, it's pretty easy to pick up a piece of crud in the needle and seat or a jet. If it goes on for a while it can score the cylinder a little and it will read a good comp.# but at higher rpm under load it can wipe the cylinder wall clean when that piston temp comes up. Especially the top two cylinders.

It's a tedious job of process of elimination for a broad problem like you have but it'll be like a checkup for your motor.
Good luck
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