Dynojet Kit vs. Mikuni Main Jet Swap

[Jonny_C]

I have an '83 Suzuki GS650 that I'm going to be putting a 4-into-1 exhaust on and pod filters. Being that this was supposed to be a budget build, I want to cut costs wherever I can. Dynojet makes a $100 kit for it that comes with main jets, needles, clips, and springs. I'm wondering if I can order OEM Mikuni main jets at $3 a piece and come out with roughly the same results.

The Dynojet kit comes with 160 and 155 mains, which according to http://www.jetsrus.com/FAQs/FAQ_mikuni_vs_dynojet_vs_keihin_sizes.htm I should be able to start with a Mikuni 150 main jet. Now I don't know if that chart takes into account Dynojet needles vs. Mikuni needles. It seems that making a jump from the stock 110 jet to 150 is a bit much. But if I have to buy 4 different jet sizes to try out, that's only $48 vs. $100 for the kit (that only comes with two jet sizes). Money will be left over in case I need to buy new pilot/slow jets as well.

Anyone go with pod filters and swap main jets and needle shims without going with a full jet kit? How big of a jump in main jet did you start out with?

- Jon

 

[Sonreir]

Going from 110 to 150 is not just a big step. That's a huge fucking leap.

If the carbs are/were working, leave them alone. Finish what you're doing on the bike and then ride it. Don't change stuff until you know that you need to.

 

[Jonny_C]

That's why I don't get why the stage 3 kit would come with DJ160 mains. The kit is meant for a free flow exhaust and air pods. I will certainly have to change the mains, and I figured while the carbs are out and being rebuilt I might as well take a guess and toss the approximate mains in there.