GS1100 vs Katana needle/needle jet

[Wayne]

My '80 GS(X)1100e needed stock carbs and the best set I could find at a recycler was from an 1100 Katana. "Same carb" I was assured.

Close, but not quite. The main difference is that the KAT needle is a 5D 59 into an X-2 needle jet vs a 5D 58 on the GS which has an X-1 needle jet.

Other slight difference is that the Kat pilot jet is a 47.5 vs a 45 on the GS.

I take it the engines on these early Kat's are the same as that on the GS/GSX 1100's (?).

Am I worried about nothing here, perhaps the changes are an improvement or is this going to be a source of hair tearing for me when I come to tune the bike ?

 

[Wayne]

Okay, found myown answer. The carb specification published on the net must only apply to a particular region- don't believe everything you read.

It turns out that 1980 Australian GSX's have different carb specs to some of the specs on the web and the 5D59 needle into an X-2 jet is stock for over here.

 

[Aussie Rob]

Wayne,
I have had a quick look in my GXS1100 Service Manual and it looks like the 5D59 needle is standard but the needle jet is dependent on the carbies I.D. No.
If you have 49210 carbs the needle jet is X-1,
Carbs with I.D. No 49230, 49250, 49260, 49270, 49290, 49330, 49340, 49360, 49370, 49390, 49510 and 49500 all have the X-2 needle jet.
You are right that the carb specs are perticular to a region, but if you check the I.D. No there shouldn't be any doubt.

Hope this helps.

Cheers Rob

 

[susukeegs]

Wayne,
I have had a quick look in my GXS1100 Service Manual and it looks like the 5D59 needle is standard but the needle jet is dependent on the carbies I.D. No.
If you have 49210 carbs the needle jet is X-1,
Carbs with I.D. No 49230, 49250, 49260, 49270, 49290, 49330, 49340, 49360, 49370, 49390, 49510 and 49500 all have the X-2 needle jet.
You are right that the carb specs are perticular to a region, but if you check the I.D. No there shouldn't be any doubt.

Hope this helps.

Cheers Rob

Hey Rob,where did you find the info about carbs 49230? Looks like carbs with this ID were on my bike. But I can't find the specs for them.