I have a 07 660 two seat full 4130 racecage and aluminium body with intake, sheave 14 gr greaseless, hi flowfuel pump msd, and a two brothers exhaust. had a purple and white spring in and top out at 53 and now with the orange spring in it only goes to 43 and starts to sputterand pop. Any help wuld be great Imthinking of going backto the other spring any other ideas
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