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Author Topic:   Bad miss until 4000rpm
racer038
Dirt Maniac

Total posts: 111
posted September 24, 2005 10:55 PM  
OK, 2nd week in a row motor has run like a dog. Misses coming off the corner to the flagstand and then it clears up through the next corner. Only does it under a load, not in the garage. Swapped out carb, fuel lines, fuel filter, fuel pump, added another engine ground. Checked timing, battery, plugs, firing order, etc. The distributor was taken out of a running car and put in this engine. Next step is to put another distributor in. What are we missing? Most of the time its a HIGH RPM miss. Our clears up at 4000.

sc1 racing
Dirt Freak

Total posts: 419
posted September 25, 2005 09:47 AM  
check compression

sideways
Dirt Forum Champ
Total posts: 715
posted September 25, 2005 08:03 PM  
Mine done that with a flat cam lobe.Foot on the wood til 1/2 way down both straits then hang on were coming up the rpm.Lifter was coming apart.Idled fine ran ok cold even 2 laps in went to missing.

IowaFuzzy1
Dirt Maniac

Total posts: 136
posted September 25, 2005 09:32 PM  
Like sideways said, check for a bad cam,also check for a broken inner valve spring.We had one do the exact thing and we had a bad cam.

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