where to source 77'gs550 performance jets

[Zafe]

As the title says


looking for a performance jet kit for my 77 gs550,


does anyone have one, or know where to get one ? Figure i need around the 120 jets, has a cored out stock exhaust, and 50mm trumpets,

[boontonmike]

Ebay has all sorts of jet kits.

[hampshirehog]

Z1:

http://www.z1enterprises.com/searchresult.aspx?All=True&KeyWords=jets

[Zafe]

Ebay has all sorts of jet kits.

havent seen any stage 2 or 3 kits for the 77,


and z1 doesnt seem to sell plus size jet kits

[Zafe]

im gonna need to get schooled on some carb science,

http://www.ebay.com/itm/SUZUKI-GS550-16-PERFORMANCE-JET-KIT-1977-1978-1979-/380393452095?pt=Motorcycles_Parts_Accessories&vxp=mtr&hash=item589137723f#ht_1827wt_907

i was under the assumption that the stock jet is a 112.5, this kit goes upto a 105 ?

will this be enough for a cored exhaust, and trumpets ?

[boontonmike]

I'm pretty sure the stock jets are 80's

[hampshirehog]

Z1 is cheaper.

[Big T]

https://www.jetsrus.com

There aren't jet kits for the VM carbs because the VMs don't need kits

Just order the jet sizes you want and start tuning

[7981GS]

16 main jets with shipping from Z1 are only about $35.00
Spend your money any way that you see fit but, I would just call Z1.

Daniel

[Zafe]

Thanks for all the replies, i will most likeley call z1 in the morning,

What jet sizes are you guys running/pending mods?

[Big T]

120s should be a good start

Raise the needles one notch

Then, plug chop time

You may end up with larger jets (including pilot jets) with the velocity stacks

[Zafe]

120s should be a good start

Raise the needles one notch

Then, plug chop time

You may end up with larger jets (including pilot jets) with the velocity stacks

Sent Z1 an email,



""The general formula for what you’re describing:

+1 on pilot jet
+3 on main jet
+1 notch on jet needle (usually one notch up from the bottom notch, thus elevating the needle)

Stock jetting, if a B, C, or EC model, was 15 pilot and 80 main.

So get a 17.5 pilot (+1), and an 87.5 main (+3).

http://www.z1enterprises.com/Pilot-Jet-VM22210--175-83.aspx

This is a bit problematic, Zach. I don’t stock anything smaller than a 92.5 main jet.

You may want to get all the jets from Sudco – www.Sudco.com or 800-998-3529

Their part numbers:
#17.5 pilot …… 004-003
#87.5 mains ….. 004-163
#90 mains…..004-164

""


the #17.5 pilot makes sense, but from #80 to #120 on the main seems excessive?
I am looking to order 4 or so different sizes just would like to specify a range,

something of the sort #105-#110-#115-#120?

[hampshirehog]

On a 550 I would leave the pilot jet alone - you can tune that in easily on the fuel and air screws (plus don't forget on the 550s you have that odd 'double pilot jet' arrangement). Raise the needles one notch and about 90 on the mains (maybe 95 to start, erring on rich). That will get you ballpark enough for fine tuning. Anything over 100 on the mains on for the bigger VMs.

[Zafe]

Such great information on this forum. thanks again all

[Big T]

Sent Z1 an email,



""The general formula for what you’re describing:

+1 on pilot jet
+3 on main jet
+1 notch on jet needle (usually one notch up from the bottom notch, thus elevating the needle)

Stock jetting, if a B, C, or EC model, was 15 pilot and 80 main.

So get a 17.5 pilot (+1), and an 87.5 main (+3).

http://www.z1enterprises.com/Pilot-Jet-VM22210--175-83.aspx

This is a bit problematic, Zach. I don’t stock anything smaller than a 92.5 main jet.

You may want to get all the jets from Sudco – www.Sudco.com or 800-998-3529

Their part numbers:
#17.5 pilot …… 004-003
#87.5 mains ….. 004-163
#90 mains…..004-164

""


the #17.5 pilot makes sense, but from #80 to #120 on the main seems excessive?
I am looking to order 4 or so different sizes just would like to specify a range,

something of the sort #105-#110-#115-#120?

Sorry, I went too big - forgot you have a 550.

It might help if you add your bike into your signature

But, a lot of 1000s start with a #95 main and end up at #120, which is +10 jet sizes