Okay guys, I need some help with jetting. I have picked up a set of triple pipes from a 99 Mach 1 and have them installed on my 98 FIII 700. How should I jet this thing? The 99 Mach had flatslides and my machine has roundslides so herein lies my problem. Would I be safe if a jetted to 98 Mach 1 specs? Is there some conversion factor that you have to take into consideration when comparing flatslide jetting to roundslide jetting? Any info would be greatly appreciated. Thanks in advance.

I have a friend who did the same exact thing you did, but he picked up a set of TM38's off a 99 Mach 1 really cheap (so cheap that it was cheaper for him to get those carbs than change a few jets).

Anyways, I have the spec book for Doo's for 98 and 99. Since Doo used different carbs in the 98 and 99 Mach 1's, as well as the change in pipes, you don't have an exact configuration to go from.

I think that if you're talking 38mm carbs, a 300 jet is the same as a 300 jet, regardless of if you have a flatslide carb or a round slide. They all use the same exact jet anyways. You can see evidence of this with the 98 Mach 1 vs. 99 Mach 1. 98 Mach 1 VM's use 300's and the 99 Mach 1 TM's use 300's.

Your main jets should be 310-300-310, 99 Mach 1 specs 300-300-300. I find that really interesting.

Pilot jets are the same size. Needle jets and needles are different between the two years, I don't know if that really means anything.

Looking at what the 98 & 99 Mach Z's used, the 98's used 310-320-310, and the 99 used 310's all the way across. Needle jets & needles were changed slightly, too.

Basically, just start off rich and keep jetting down until you're comfortable with plug color and piston wash. Unless you can find someone who did the same exact thing that you did. (there HAS to be someone out there) Another friend of mine is also contemplating this change, so I would be very interested in your results.

Hope this helps,

Jim
97mach1@voyager.net

What are stock mains in a 00' Mach Z? 300,310,300? Havent got a chance to check yet

310's all the way across, the 2000 Mach Z pipes & airbox are the same as the 1999's.

I am assuming the RER model is the same then?

Yes.