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How many "steps" between 80 and 102?

  • Thread starter Thread starter Pendulum
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Pendulum

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I'm rejetting my bike for the new pipes, and I've been told to go 2-3 on the mains. Since my pilot fuel screws were broken, I ordered some GS750 carb kits that included the screws needed and they came with mains marked "102." The mains in the 550 kits are marked 80. How many steps are between the two? According to Jets R Us, it looks like a 9 step difference!
 
What pipe are you using? 4-1 or a 4-2? Let's not call em
"steps" call them sizes. If you're just using a non stock pipe, 4-2 I'd say you only need to go up two sizes. And you may not even need that. If you're using a 4-1 headed then maybe. But often,if you're using the stock airbox you don't need to up jet much for a pipe alone. The stock pipes flowed pretty good as it was, a jetting change for a 4-1 is often necessary because of back pressure changes. But I'd be surprised if you need more than two sizes up for a aftermarket 4-2 set up like a Mac or something.

But to answer your question, 80 to 102 is 9 sizes. And that's much to much if you're using a stock airbox.
 
If it is really a "102" stamped on the jets then they are not Mikuni jets. And if they are not Mikuni jets then who knows what amount of fuel they will flow.

I do have a 4/1 on my 550 and I run standard main jets, in fact all jetting is standard, and it runs fine. Although I believe the silencer is fairly restrictive and i have retained the standard airbox. As Josh says the most you will need for a pipe is 1 or 2 sizes up and maybe not even that. You will only know if you test at full throttle.
 
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