Jetting help please.

[Jeremy Orman]

I posted on here a long time ago and got some great advice on my previous blaster for the jetting. After leak down and plug chopping it was spot on. I’m building one for my son and trying to get close w the jetting while I’m ordering rebuild parts. I’m doing a +3 crank it has an open air box w a uni filter and fmf fatty w stock silencer. That’s all I’m doing to it so far and I’d like to know what to order for the main and pilot jets. I’m in West Michigan so that’s my altitude. Any help would be greatly appreciated from this forum. Thanks again.

 

[Awk08]

Stock carb
stock pilot
airscrew 1.5 turns out to start
stock needle on middle clip position
buy 270 thru 310 genuine mikuni mains, start large and plug chop down

 

[Jeremy Orman]

At what point do I need to worry about changing the pilot jet?

 

[Larry's Shee]

At what point do I need to worry about changing the pilot jet?

Very few setups need a different pilot or needle.