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1983 GS1100E Jetting Question

posplayr

posplayr

Forum LongTimer
Past Site Supporter
TGSR Superstar
I saw this post from Mike McNaney who apparently is no longer a member. His bike seems to be moded virtually the same as mine and he says he uses 142.5 jets (mains I assume)


From this thread.

http://www.thegsresources.com/_forum/showthread.php?t=97315&page=5

I have two jet kits , a K&N from the PO and a Dynojet kit I recently purcahsed with new POD's. Both kits come with 110/114's for stage I and 132/138's for Stage III. Mike says he started at 137.5 and moved eventually to 147.5's and returned to 142.5's. I assume he is talking Dynojet numbers and his bike started at the max Stage III. Does this make sense? If so I should probably look for some 142.5's.

1983 GS1100E
10.25:1 compression (reads 190-200 psi cold)
1150 36mm carbs
Yosh 4:1
K&N Pods
0.340 Webcams
degreed 106/104 Ext/Int
Accell coils

TIA
Posplayr

Post from Mike below:


That pretty much as I imagined. I havent had enough carb problems to worry about it. I guess my boys old honda is using a VM if thats the case.

Im really wondering whats up with all the carb jetting problems everybody complains about. i guess my upgrades have hovered somewhat around the stock parameters. 1166 and BS 36's are in the range of a stock 1150 exept for the cams. Web .340's. I only needed two steps up on the mains after the cam install. They were at 137.5. I actually tried 147.5's and the top end was impressive but I left a black trail of smoke everywere I went. The 142.5's are about perfect for my combo it seems.

Complete acceleration with no sag all the way to 9 grand.

I'll count myself lucky I guess.

By the way do all you guys change your mains and bits with the carbs on the bike? I hope so. 15 minutes total.
With all the problems zeroing in, that alone would be a huge pain.
​
 
I'd start with the 138 Dynojet main and needle set at second from the bottom.
I'm not sure if Dyno makes jets as big as 142.5s. He was probablly using Mikuni jets.
 
When I see these jet and Pod questions, I always ask myself why it need so big jets?
When I look at GSXR1100W ? 95-98 spec, the main jet is only about 125 but it already produce 155hp at stock.
If we use 140 or something like that on our GS motor, do it really all the fuel can completely burnt in our standard GS motor and produce a lot of HP like the GSXR1100W.
 
Chef

Chef

Thanks for the reply Bill,
I forgot to mention that the PO jetted the bike at 132's because he said the 138's were to much. The 0.340's should need a little more juice dont you think??? \\:D/
The DJ instructions say 3rd grove from the top. 2nd from the bottom (as you say) would be 3 notches richer right?

Posplayr
 
Addy

Addy

As seen in the other reference post, DJ goes by orifice size and most of the OEM's go buy flow rate designations so numerical jet size comparision could be apples and oranges. If the plugs/fuel air ratio/ and power are there then I suspect that the engine is running at optimum however much fuel is being consumed. Mike had commented that he was getting a lot of black smoke when he went too large so that may be partially answering your question.
I certainly think that my initial jet sizing would be based on the same settings of a very similarly tuned bike (i.e. Mike's) rather that your more modern GSXR1100W ? 95-98 spec.

Good Luck.

Posplayr
 
Jet sizes

Jet sizes

Sorry to bother you all, but while you were on the topic of jet sizes, I thought I might ask a question about them rather than start a whole new thread and then get blamed for starting yet another jet conversation. Could anyone point me in the right direction for rejetting a Kat1000 that will soon be fitted with pods. I know, I know, everyone is saying "keep the airbox", but after reading a couple of other threads with positive coments about pods on 1000cc engines, I thought I'd give it a go. I have never even bought a new set of jets so where should I get them from and do they come as kits with different sizes for fine tuning or do I need to specify what sizes I need and just get the 4 jets?
The bike in question has standard Mikuni flat slides and a 4 into one system. I believe the two centre pistons need to run richer than the two outside pistons. Could anyone give me an idea of jet sizes to order.
Thanks very much in advance for any help and sorry Addy, I do not mean to hijack your thread. I just thought I'd cop it in the neck for starting another thread about jets.
Scott.
 
Thanks posplayr.
I'll have a look around those link right now.
Scott.
 
posplayr said:
Thanks for the reply Bill,
I forgot to mention that the PO jetted the bike at 132's because he said the 138's were to much. The 0.340's should need a little more juice dont you think??? \\:D/
The DJ instructions say 3rd grove from the top. 2nd from the bottom (as you say) would be 3 notches richer right?

Posplayr
Click to expand...

Actually two notches richer. Try this jetting and I'm willing to bet it's real close if not spot on.
 
Groovey Man

Groovey Man

Chef,
I checked my new kit needles again and they have 7 grooves not 6 as I think you are assuming. The instructions shows a drawing and it only shows 6 as well. So to make this even more confusing. You are suggesting increasing the richness by two grooves from the instructions. Summarized below
1150_carb_jets2.jpg


Grooves from Top from Bottom
Instructions 3 5
Chef' s Rec 5 3

Both sets of instructions show the same part number DNT406 and that it applies to all 80-86 Suk gs1100-1150 16-Valve engines.

I'm now wondering what is in the carbs already.

Posplayr
 
Yep; well maybe not.....

Yep; well maybe not.....

The instructions say 3133.001 hummmmm.....

I got it in this combo kit for cheap.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&viewitem=&item=110218299682

The listed part number for the Jet kit is the same as the old K&N jet kit (I have the box from the PO) that seems to also be made by Dynojet.

As I said the PO already did a Stage III modification, but for the price I got I just decided to do with new so I know what I got.

Posplayr

Web 0.340's are in ; look real sweet expecially having the Tach gear. Two more orders coming in with oil pump, top end oiler, started clucth and other misc.

I'm hoping to be assembling the engine by Next weekend and then I'll start pulling apart the frame for painting.

Posplayr
 
Last edited:
posplayr said:
I saw this post from Mike McNaney who apparently is no longer a member. His bike seems to be moded virtually the same as mine and he says he uses 142.5 jets (mains I assume)
Click to expand...

Posplayr,

I jetted my 82 1100E myself with Mikuni parts, so I have some experience with what you are going through. I would say your best bet is to just put in the richest jets you have and start off setting the pilot circuit, then the needle, then the mains. No matter what you do, you won't nail it the first time, so make sure you are rich to start with and work it in from there. The reason I say that you won't get it the first try is that even if you do happen to nail it, you need to try tweaking a little each way to see if it can get better. If both ways don't improve, then you have found the sweet spot. I would say I had my carbs apart 6-7 times before I found my final settings. It took a couple of saturday afternoons to get it right, but now it is sweet and i can say I did it myself.\\:D/

Mark
 
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