Anyone running 850 with pods and 4-1? What carb jetting?

[Guest]

That's a good read, thanks.

I've been progressivelly lowering the needle and that kept improving the situation on acceleration. I got down to 2nd notch from top (+washer) but I'll go further down as there is still a slightly rich condition just off idle (sometimes the bike bogs down just a tad bit when accelearting from a stop) and also WOT in 5th gear from low rpms produces a few stumbles til more air starts getting in at aprox 3,5k rpm.

As noted, at this setting there is a massive popping on deceleration. I have now installed two sizes smaller pilot air jets (#190 in place of #200) and that took care of most of the popping but not all. I think I need to go another two sizes smaller (#180).

Pilot screws I re-adjusted (again, just to be sure...) using the highest rpm method and they are sitting at approx 2 to 2,5 turns out.

I also re-ballanced the carbs and while they were already in spec now they're even more ballanced :lol: .


So, the next step is to order a few more pilot air jets, pay through the nose for shipping, then wait, and wait for the mail man... and then more tuning.

I'll keep you posted.

 

[boingk]

Good stuff mate, sound about the same as what I did to my GS850 when I had it. I ended up using proper Mikuni jets and going 18% oversize from the original number on the mains, along with a raising of the jet needle a notch or two. Can't remember the rest but those parts are rock solid in my memory.

You sound like you're pretty much spot on track from what you describe - see how those pilot jets go and get back to us!

CHeers - boingk

 

[Guest]

Well, I finally ordered further two sizes down pilot air jets (#180). I should have them in two weeks so, "stay tuned" (pun not intended)

I ended up using proper Mikuni jets and going 18% oversize from the original number on the mains,

18% on stock size #115 would be #145 which is equal to DJ #155. I've been using the bigger #160 which may explain why I needed to lower the (DJ) needle to 2nd notch from top and still have a slightly rich condition...

Would it be better to go smaller on the main jet (#155) and lift the needle a bit or stay with the current main (#160) and further lower the needle? Pros and cons?