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1981 GS1000E Chasing a Nightmare Tuning Gremlin...

  • Thread starter Thread starter Phaedrus
  • Start date Start date
2 different jet kit's needed..it's more than just main jet sizes as the needles are different in length and shape also.
i have never cut each carb in half and examined them so i can't give a technical description of any differences..only visual(2 hole/4hole.
if the OP tried swapping jets and such we would be right back where we started.
my suggestion kept the OP from dissembling his engine for no reason.
in my 25 years of working on these shlt boxes i always had a spare set of jet kitted carbs or access to a set to swap on a bike that had confusing issues.
it appears my suggestion to the OP saved him some(a lot) of grief.
the end....
 
OK so, as I stated, jetting is different between 2V and 4V engines. I assumed that included the needle jet and needles as well. Aren't the main bodies interchangeable? Like I said, it seems the two extra ports on the air cleaner side are dead ended and don't contribute. Just for clarification sake, assuming that the carbs were going onto the same engine, are you saying that you would need two different jetting kits based on 2-hole v/s 4-hole carbs? I was not aware of this.
 
JTGS850GL said:
OK so, as I stated, jetting is different between 2V and 4V engines. I assumed that included the needle jet and needles as well. Aren't the main bodies interchangeable? Like I said, it seems the two extra ports on the air cleaner side are dead ended and don't contribute. Just for clarification sake, assuming that the carbs were going onto the same engine, are you saying that you would need two different jetting kits based on 2-hole v/s 4-hole carbs? I was not aware of this.
Click to expand...

To expand on this confusion a little bit: there are two separate jet kits that dynojet makes, one for the 8 valve and one for the 16 valve '80 GS1000. I assumed that my engine is 8 valve, I'll need the 8 valve jet kit. Are you saying that the jet kit is carb-specific and that if I'm running 16-valve carbs I need a 16-valve kit, no matter how many valves the bike has? (Makes perfect sense to me... Just hadn't put it together)
 
here is what we have...think about it.
WHY would suzuki make 2 different BS 34's in the same year(s)?
they have done this sense 1980 through around 1984...WHY?
if they was the same or interchangeable then how much money could suzuki have saved making only one casting?
instead of asking me question i can't answer just ask yourself WHY?
these was never a 16 valve 1000/1100 with 2 hole BS 34's.
there was never 1000/1100 8 valve with BS 34's with 4 holes.
WHY?
because they are not interchangeable and have different internal passages and or sizing.
WHY?
 
Phaedrus said:
To expand on this confusion a little bit: there are two separate jet kits that dynojet makes, one for the 8 valve and one for the 16 valve '80 GS1000. I assumed that my engine is 8 valve, I'll need the 8 valve jet kit. Are you saying that the jet kit is carb-specific and that if I'm running 16-valve carbs I need a 16-valve kit, no matter how many valves the bike has? (Makes perfect sense to me... Just hadn't put it together)
Click to expand...

YES and
YES
but........
you always have to be sure your carbs are correct for your year/make/model.
the above is crucial when ordering a jet kit because you can not return them after they are opened.
added!!!!!!

YES the jet kit is bought per carburetor size/style.(this is determined by the year/make/model) as long as you are 100% sure your carbs are correct for your bike.
if you have a known set of 80-83 1100E carbs but was going to install them on a 1978 GS1000.
you WOULD purchase a st.3 kit for a 80-83 GS1100E.

ok i hate typing and thinking and typing...you get idea :D
 
Last edited:
blowerbike said:
here is what we have...think about it.
WHY would suzuki make 2 different BS 34's in the same year(s)?
they have done this sense 1980 through around 1984...WHY?
if they was the same or interchangeable then how much money could suzuki have saved making only one casting?
instead of asking me question i can't answer just ask yourself WHY?
these was never a 16 valve 1000/1100 with 2 hole BS 34's.
there was never 1000/1100 8 valve with BS 34's with 4 holes.
WHY?
because they are not interchangeable and have different internal passages and or sizing.
WHY?
Click to expand...
So, another words you don't know why they're different. I can accept that. I was just curious as to interchangeability since my current GS1000 has a 4 hole carb with stock jetting and seems to run just fine. I just assumed it was a running change since I've seen too many 82+ GS1100Gs (8V engines) with 4 hole carbs to account for PO changes but who knows what can happen over a 30+ year period.

Example:
http://www.ebay.com/itm/SUZUKI-GS11...Parts_Accessories&hash=item25924aa63b&vxp=mtr

On a side note, just for clarification: Suzuki never made a carburetor for the GS, Mikuni did and there never was a 16V GS1000.
 
JTGS850GL said:
So, another words you don't know why they're different. I can accept that. I was just curious as to interchangeability since my current GS1000 has a 4 hole carb with stock jetting and seems to run just fine. I just assumed it was a running change since I've seen too many 82+ GS1100Gs (8V engines) with 4 hole carbs to account for PO changes but who knows what can happen over a 30+ year period.

Example:
http://www.ebay.com/itm/SUZUKI-GS11...Parts_Accessories&hash=item25924aa63b&vxp=mtr

On a side note, just for clarification: Suzuki never made a carburetor for the GS, Mikuni did and there never was a 16V GS1000.
Click to expand...

yes i know mikuni made the carbs for them and yes there is a 16 valve 1000cc...it's called a 1982 katana.
 
this is why i help less and less....i hate to type and even more i hate to argue.
your right...i'm wrong.
take over captain..........
 
blowerbike said:
this is why i help less and less....i hate to type and even more i hate to argue.
your right...i'm wrong.
take over captain..........
Click to expand...

This is not an argument. Please don't make it into one. I was simply asking for clarification on a blanket statement that was made by you, and you didn't have the details I was looking for to clear things up. Since this is a technical forum, and you have some technical knowledge, I was hoping for a more detailed explanation other they a simple "WHY?". WHY are you being so touchy.
 
Last edited:
Well, imma redirect this back towards my bike...

Went on a nice cruise around highway 1. Bike felt fantastic. Seems to be in pretty good tune all-around. Pulls hard. There's more lag than I appreciate when going for WOT. Might need to drill the slides a bit more? I didn't have the dynojet-provided drill bit, so I just used a size 30, which seemed to match the diameter of the bored-out slides on my GS1100E's carbs. Do you guys know what the max diameter bit you can use before the slide stops working properly?

Feels great to have this project complete(ish). Still want to re-do and relocate the electronics to the tail. But, that can wait while I play for a bit :)
 
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