What the deal with 88-89 katana jet kits?

[Guest]

I notice all the time on ebay that there are tons of stage one ket kits for 88-89 katanas. What makes them so special? Is there something unique about the carbs on 88-89 models that distinguishes them from 90-up models or is this just another case of manufacturers mislabeling products? Anyone have any thoughs?

Just curious

[HS2020]

Not sure but how much are they? I need to rejet my bike and clean and sync the carbs again.

[Cbass]

I saw them on ebay last night for 50 bones. I was kinda pissed cause I just bought one for 120 a couple of weeks ago. Oh well, live and learn I guess.

[The CyberPoet]

As far as I know, it's because they were a different carb size (the '88 & 89 use a Mikuni BST31SS, while 90+ uses BST33SS0. This may mean DynoJet/K&N built a bunch in '89 on the presumption that the line would continue to use the same carbs... or maybe the carbs are also used in something else (bandits? RF600?).

Cheers
=-= The CyberPoet

[Waltari]

As far as I know, it's because they were a different carb size (the '88 & 89 use a Mikuni BST31SS, while 90+ uses BST33SS0. This may mean DynoJet/K&N built a bunch in '89 on the presumption that the line would continue to use the same carbs... or maybe the carbs are also used in something else (bandits? RF600?).

Cheers
=-= The CyberPoet

ok...that makes sense

[chriskatana]

As far as I know, it's because they were a different carb size (the '88 & 89 use a Mikuni BST31SS, while 90+ uses BST33SS0.

Cheers
=-= The CyberPoet

you, as usual, are correct,
the 88-89 modesl used a 31mm carb, and the rest use a 33mm carb..

[HS2020]

Umm didn't the 88 GSXR motor run the same 31 mm carbs in 89?

[The CyberPoet]

Umm didn't the 88 GSXR motor run the same 31 mm carbs in 89?

I have no clue, personally...
Maybe someone else does?

Cheers
=-= The CyberPoet