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TOPIC: Jetting a BS34 GPZ 1100 POD's and 4-1

Jetting a BS34 GPZ 1100 POD's and 4-1 5 years 2 months ago #500947

  • jydog
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Just to tide me over till I get this fuel injection figured out. I am going to run a set of BS34's on my stock GPZ1100.

After researching this I came up with this:

rule of thumb 140/#40 - 145#42.5 as 1000/1100 .

Does this look right? I would rather error or the fat side than burn my engine up. Also where do I buy the jets and rebuild kit for these carbs? The carbs I have now are off an 81 KZ1000p.

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81 KZ1000 LTD
Griffin GA

Jetting a BS34 GPZ 1100 POD's and 4-1 5 years 2 months ago #501202

  • Gary - K7GLD
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Elevation comes into play - I'm at a bit over 3000 feet - with surrounding mountain passes at over 5000 feet. I'm running an '83 KZ1100LTD with Kerker 4/1 pipes and pods - running about 136 main jet - Drilled myself - and 37.5 pilot jet, needle clips set at 3rd notch down in a 6-slot needle - bike runs great at all gear ranges and RPM - but for better power, 140 or better mains would deliver somewhat better acceleration, but already fast and powerful enough for my needs. Plugs read great, engine fires instantly, and idles great.

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John Day area - Eastern Oregon
Restored 1983 Kawasaki 1100LTD

Jetting a BS34 GPZ 1100 POD's and 4-1 5 years 2 months ago #501261

  • Mookachacka
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Doesn't that seem a bit big for main jets? Seeing how they only come in tp play at the top 1/4 rev range (with some overlapping of the jet needle) I would only go up a size or two compared to stock if the engine is in normal tune.

On the top of my head I think the main jet's for the gpz was something like 127.5 or 130...but don't qoute me on that one!

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Jetting a BS34 GPZ 1100 POD's and 4-1 5 years 2 months ago #501283

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Gary - K7GLD wrote: Elevation comes into play - I'm at a bit over 3000 feet - with surrounding mountain passes at over 5000 feet. I'm running an '83 KZ1100LTD with Kerker 4/1 pipes and pods - running about 136 main jet - Drilled myself - and 37.5 pilot jet, needle clips set at 3rd notch down in a 6-slot needle - bike runs great at all gear ranges and RPM - but for better power, 140 or better mains would deliver somewhat better acceleration, but already fast and powerful enough for my needs. Plugs read great, engine fires instantly, and idles great.


That sound like what I am after. I want the engine in a safe zone but do not want to smell like exhaust everytime I ride.

Mookachacka, I found this re-searching I dont know how good the info is but hopfully it will be helpful

Stock UK Spec. Mikuni 34mm carburettors as fitted to the following Kawasaki (UK) models.
Read L-R like this:
Model, Cross Pilot & Plug(Yes or No), Main Jet, Pilot Jet, Jet Needle, Needle Jet, Main Air Jet, Pilot Air Jet
GPz750R1, Yes, 110, 37.5, 4BE3, Y9, 250, 300
Z750L3,4, Yes, 110, 37.5, 4BE3, Y9, 250, 300
GPz750A, No, 110, 37.5, 4BC7, Y8, 250, 300
Z1000K1,2, Yes, 122.5, 37.5, 5FL52, Y1, 85, 350
Z1000J1,2, Yes, 127.5, 37.5, 5FLZ50, Y6, 85, 350
Z1000J3, No, 117.5, 37.5, 5CF58, Y2, 85, 350
Z1000R2, No, 127.5, 37.5, 5C48, Y4, 85, 350
Z1100A1,2, Yes, 120, 37.5, 5GX29, Y1, 85, 350
Z1100A3, No, 117.5, 37.5, 5CF58, Y2, 85, 350
Z1100R1, No, 130/5, 37.5, 5B5, Y8, 85, 350
Note: Numerical difference in main AIR jet size between the 750 and 1000/1100 carbs is huge whereas the difference in pilot AIR jets is much less.
Note: All the different main jet, needle and needle jet combinations.
Note: All have 37.5 Pilot Jets.
Note: Z1100R1 cylinders 1&4 - 130, 2&3 - 135 - presumably an extra cooling consideration for the two inner cylinders?
Note: All UK needles are 5 position adjustable (stock is No. 3 (middle) clip position)

I think I might just be drilling out my main jet and see how it does. I found jets pretty cheap on amazon.com also. Who would have figured?

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81 KZ1000 LTD
Griffin GA
Last Edit: by jydog.

Jetting a BS34 GPZ 1100 POD's and 4-1 5 years 2 months ago #502029

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Well, I ended up going with 40 pilots and 140 mains. Runs alot better and way more power but I have some backfireing from somewhere. Maybe an intake leak? Kinda sputters and coffs at 1/4 throttle.

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81 KZ1000 LTD
Griffin GA

Jetting a BS34 GPZ 1100 POD's and 4-1 5 years 2 months ago #502035

  • OnkelB
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I'm running the exact same combo on my GPz 1100 bastich (BS34s with pods, 4 in 1, 40 pilots, 140 mains) and I have exactly the same issues, bike runs really strong from about 1/4 throttle and up, below that I get occasional popping and backfiring.

I have a feeling that the culprit is the pods (not my choice, they were on the bike when I bought it), I intend to install an airbox and filter and take it from there.

Btw, I'm pretty much at sea level, 300 ft above.

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77 KZ 650 B1, 82 GPz 1100 B2.

Jetting a BS34 GPZ 1100 POD's and 4-1 5 years 2 months ago #502038

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I've got an airbox. Ill give it a try and see if it helps. What do you have your pilot screws set at? I turned mine out 1 1/4 turns like the factory manual says.

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81 KZ1000 LTD
Griffin GA

Jetting a BS34 GPZ 1100 POD's and 4-1 5 years 2 months ago #502046

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Mine are set the same, 1 1/4 turn out.

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77 KZ 650 B1, 82 GPz 1100 B2.

Jetting a BS34 GPZ 1100 POD's and 4-1 5 years 2 months ago #502587

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Vacuume line fell off the petcock. Doh! runs like a champ now. No airbox needed. Just messed around with the pilot screws a bit to find the best idle. Could probably use some spacers on the needles ( mine are not adjustable ) for the midrange but I am very happy with the way it runs.

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81 KZ1000 LTD
Griffin GA

Jetting a BS34 GPZ 1100 POD's and 4-1 5 years 2 months ago #502589

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hobby shops have some small brass washers that are around .010 thick and work well for needle shimming.

just so you know.

leon

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skiatook,oklahoma 1980 z1r,1978 kz 1000 z1r x 3,
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Jetting a BS34 GPZ 1100 POD's and 4-1 5 years 2 months ago #502629

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531blackbanshee wrote: hobby shops have some small brass washers that are around .010 thick and work well for needle shimming.

just so you know.

leon


Thanks Leon, I had already ordered a set from z1 but they sent me the wrong size. Good to know about the hobby shop washers.

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81 KZ1000 LTD
Griffin GA

Jetting a BS34 GPZ 1100 POD's and 4-1 5 years 2 months ago #502747

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You're on the right track with shimming your needles. Also try going out a 1/4 turn at a time on your mixture screws if you're still having issues down low. Good call on the hobby store Leon.

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Kawasaki


Someone once told me to marry that motorcycle I was riding ......there's times I wish I hadda listened .

Jetting a BS34 GPZ 1100 POD's and 4-1 5 years 1 week ago #516543

  • Rickman
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MikesXS has the emulsion tubes (needle jet) and adjustable jet needles for BS34's. the model number matches the Canada spec in my Kaw shop manual. Haven't tried it myself. Do note that you shouldn't buy one without the other.

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1983 KZ1100-L1 "LTD Shaft"
Wiseco 10.5:1 1171 piston kit, bored by APE
Dyna 2000, Dyna S, Dyna grey coils, WG coil power mod, CB900 starter
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