ohning1971
New member
I've looked in my manual for my sled and they used to have a chart that would give you jet sizes based on ambient temp and OEM recomendations now the dumb thing says colder=bigger and warmer=smaller on jet sizing. I also don't know what the OEM jet size of 156.3 for my Viper was intended to run in(maybe 20 deg F to zero????)from the factory-really would like to know just as a reference, but can read plugs too. I actually went down a size on the mains, always read too rich but also know that needle,pilots,air bleed,mixture screw and such all play a factor. Anybody have a good feel for this or maybe have a proven set up for a bone stock Viper(no pipe, clutch or reeds). Thanks for your response in advance