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Kraft kar 51
04-28-2018, 10:56 PM
I run an 04 kraft modified in imca with a claim motor. I am having issues with the motor falling on its face the coming back to life. It's on racing gas. Runs fine when you warm it up. Runs good for hot laps. Go out for heat run about 3 laps and all the sudden you go into the corner and go to get back to the gas and there is no power then all the sudden it takes off like a scolded dog and it continues to do this. We blew this motor up and was wondering if this maybe the issue. Is it the carb fuel pump pick up in the tank fuel filter. Any help would be greatly appreciated as I am out this year due to not having a motor and don't want this to happen again. Thanks chrisLittle bit about the motor. It's a 410 dart little m block dart iron eagle heads 64cc 6 inch rods 14 to 1 compression willys carb msd distributor and msd 6al box with msd blaster coil on racing gas

skicker
04-30-2018, 09:35 AM
Do you run a return line on the fuel rail?
Have you checked the vent line at the tank?
Rollover valve stuck?
Almost sounds like vapor lock???

50j
04-30-2018, 10:01 AM
What does your fuel pressure gauge say on the track?

dirtrace09
04-30-2018, 10:18 AM
Check every fitting from your fuel cell to your carb.