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

[psyguy]

I've been going through labour-like pains trying to get the jetting right for the above setup. Anyone else here got good results and can share the carb settings?

Background info here:

http://www.thegsresources.com/_forum/showthread.php?t=178409

I'm using the DJ kit. I have drilled the slides with the supplied drill bit.

.

[Octain]

I used a DJ kit on my 82.

[psyguy]

I used a DJ kit on my 82.

I do, too.
But, what main jet? What needle position (incl any shims)?

[Octain]

I do, too.
But, what main jet? What needle position (incl any shims)?

I use the biggest main in the kit, 165 IIRC.
Had it written down someplace..
I'm pretty sure I have the clip on the second groove.
Just recently moved it from the third notch but have not sync'd since.


What's the problem?

[TheCafeKid]

Max main jet size. DO NOT change the pilots, yet.

I have also found the suggestions in the instructions for the clip setting to be a bit on the lean side of things... Maybe another notch down toward the point will clear up your issue?

BTW, Like Todd asked...whats the issue(s)?

[psyguy]

Thanks guys. You can read about the probs in the other thread in detail, link above.



In a nutshell:

• with the needle on the 2nd notch from the bottom and 2 turns out on the mixture, there is a big/prolonged stumble until aprox 3k rpm / 1/4 throttle. then it's ok after that. i can also start the bike from overnight cold with NO choke (so I guess this means it's very rich on the idle/pilot circuit).
• with the needle on the 3rd notch from bottom and 3 turns out on the mixture, it's all very smooth til 1/2 throtle, then it runs like crap, ie. doesn't pull at all.

I'm using the DJ165 main jet (largest). stock shim + DJ shim under the needle e-clip.

Pilots are euro spec size 42.5 and this is one size up from the usa models that have size 40, that the dj is made for.

I'll buy size 40 pilots to have the same base settings as you guys so we're not comparing apples and oranges as that never ends well

.

[Octain]

IIRC the DJ instructions say to set needle on middle grove(third from top) and to set the screws at 4 turns out. I found that this is too rich so I currently run mine with the needle second from top with no shims and the screws anywhere from 2.5 to 3.5 turns out from lightly seated.
I've not had a chance to run it much but it does seem to run and start fine.

I dont think changing the pilot is gonna make that much difference.
Go out on the screws to see if it changes anything.

Oh yeah, if it's running rich(which sounds like it is) then I might advise you install new plugs before ya try to do much more tuning.

[TheCafeKid]

Yeah..When its close sometimes its hard to tell if the stumble is from richness or lean-ness (is that a word??)
I dont have the instructions in front of me but i seem to remember that shim washer is supposed to go ON TOP of the clip, not under it. Dunno what difference if any that would make.

It sounds for sure youre pilot circuit is too rich if you are able to start stone cold with no choke.

Clamp those screws down to 1.5 out and see what heppens...

Id check your air jets too, they may be different than US spec, and if so you'll want to match those up if you're switching pilots. Although, I had some popping with my Yosh that vanished after I went down a size on the air jet and moved the clip down a half step.

[psyguy]

IIRC the DJ instructions say to set needle on middle grove(third from top) and to set the screws at 4 turns out. I found that this is too rich so I currently run mine with the needle second from top with no shims and the screws anywhere from 2.5 to 3.5 turns out from lightly seated.
I've not had a chance to run it much but it does seem to run and start fine.

Todd, I would really appreciate if you could test your bike at WOT from low rpms in 4th and 5th gear and post the results. And also on hard deceleration (from the red line) in 3rd and 2nd gear.

I had the needle as per DJ instructions on 3rd notch from top (and the shim under the e-clip) and the bike was accelerating really well (incl WOT from 2k rpm in 5th gear!) but with HEAPS of popping on deceleration.
I only got rid of popping with mixture screws out by 5 turns (and this is with the #42.5 pilots, not #40. I could start the bike from cold with NO choke and the plugs would get foul when sitting in traffic (idling for a prolonged time)...

That's what led me to experiment with the needles.

But while the popping goes away as i lift the needle, the WOT becomes a problem and the bike doesn't pull well above 1/2 throttle...

[psyguy]

I dont have the instructions in front of me but i seem to remember that shim washer is supposed to go ON TOP of the clip, not under it. Dunno what difference if any that would make.

Josh, it's the plastic spacer goes ON TOP of the e-clip.

The stock washer is there to sit on top of the small needle spring so is UNDER the e-clip.

DJ supplies another similar shim/washer (to be placed UNDER the e-clip) - using these washers gives you an option to go half-way between notches (as the thickness of the washer is 1/2 the distance between the needle notches).

[psyguy]

Id check your air jets too, they may be different than US spec, and if so you'll want to match those up if you're switching pilots. Although, I had some popping with my Yosh that vanished after I went down a size on the air jet and moved the clip down a half step.

I think we may have a "winner"...

US Spec
Pilot fuel jet #40
Pilot air jet #190
Needle jet #X-5

Euro spec
Pilot fuel jet #42.5
Pilot air jet #200
Needle jet #X-6

What do you guys think?

[Octain]

Todd, I would really appreciate if you could test your bike at WOT from low rpms in 4th and 5th gear and post the results. And also on hard deceleration (from the red line) in 3rd and 2nd gear.

My exhaust isn't sealed so it pops on decel but it dont bother me as I know the reason.
The last time I rode it had some issues on very hard acceleration but like I said I haven't sync'd since I moved the clip from third notch to second(from top). Also didnt check the plugs after I rode but I'm betting it's still on the rich side.
I have to choke it to get it to start but only for a moment or two and when I turn off the choke it have to blip the throttle a bit before it;ll idle on it's own.

I have not been able to find my notes either.

[Octain]

Found my notes..

Needles are on second notch from top, no washers(shims)
165 DJ mains.
40 pilots.
Air jets, inner 175. Outers 180.

DJ air restrictors per DJ ins.
Slides drilled with the bit supplied by DJ.

[psyguy]

Thanks Todd.

I think my thinking's been a bit wrong. As I had pops on decel I went adding the fuel which did take care of popping but also led to too rich condition all over the range.
Instead, I think I need to look at reducing the air at the pilot circuit.

I have now fitted DJ 160 mains (middle size of the 3 sizes supplied) and that solved the WOT problem almost completely. There is however a flat spot at WOT at about 5-6k rpm. There is also a hesitation at WOT in 5th gear from 2k rpm. I think lowering the needle a half notch (back to the DJ recommended setting) or a full notch should take care of this situation.

To deal with the popping now I am going to go smaller on the pilot air jets.

I wanted to order some air jets from http://www.motorcyclecarbs.com/ but after several back and forth emails didn't get anywhere - they have problems with processing international orders.
Anyone know of any other supplier?

[Suzuki_Don]

Ivor, what size pilot air jets are you using currently. Let me know as I have a few sets of air jets in the cupboard (used) and depending on what you have these might be of use to you.

BTW ------MERRY XMAS