Re: CARBURETOR HELP Big Block 625cc
One option would be to install an adjustable main jet from someone such as ECcarbs or NRracing. P.S. Some that have done this on the 625 used the methanol unit as the jet size is larger than the gas unit the reason being the kit is for a 390-460 clone. The 625 has a higher fuel demand so using the methanol jet needed less turns out which resulted in the needle screw less likely to have to be where it might not be tight enough the tension spring.
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