Triumphrat

Spooner · 08-09-2005, 04:53 PM

What's this all about?? What would it do to my bike if I swapped to TBS carb rubbers??

95TBird · 08-09-2005, 06:38 PM

Quote:

What's this all about?? What would it do to my bike if I swapped to TBS carb rubbers??

The primary differnece between the Thunderbird and the Thunderbird Sport horsepower wise is an exhaust balancing pipe and the thunderbird had restrictive carb rubbers. The rubber manifolds that connect the carb to the head had a restriction inside in order to reduce power. Essentially, If you remove the restriction, you have a TBS engine with no balance pipe on the exhaust. It will not get you to the TBS numbers but it will improve your horsepower.

Frank

Bodger · 08-09-2005, 06:45 PM

I carved my rubbers out a bit on the tbird. Even though they are not supposed to be restrictive, it does make a difference.

Spooner · 08-09-2005, 06:57 PM

Down to the stealers tomorrow and order me some is what I'm gunna do

maxpower · 08-09-2005, 11:17 PM

Any concerns about rejecting after this mod? ;-)

maxpower · 08-09-2005, 11:27 PM

MMmmmmmm TBS carb rubber... aaaaaaggggggg.
Doh! Stupid spell checker. (

(|).

I suppose anti-rejection drugs would be the order of the day.

Alright, I'll try again.

Is it necessary to re-jet after this or is that required only for the Air box Modifications.

ClassiclyMobile · 08-10-2005, 01:27 AM

The nearest dealer where I live stocks them. I thought they all would so maybe I'm spoiled. As far as I know they are the same on all the classics. My '99 Legend came with unrestricted carb rubbers and had #98 main jets and #38 pilots so there should be no need for rejetting. However, if you are going to pull the carbs out you should consider a jet kit, venting the airbox, and aftermarket pipes.

Spooner · 08-10-2005, 07:03 AM

Called my dealer and asked about the rubbers. He could only find one set for the TBS but several for the t-bird depending on year and so on. Now I know that the t-bird went from Mikuni to Keihin...what about the TBS? Did they stick with the same? Which one in that case? Does it matter? Will the rubber with no matter if its a mikuni or keihin?

jimmyj900 · 08-10-2005, 11:37 AM

Quote:

Called my dealer and asked about the rubbers. He could only find one set for the TBS but several for the t-bird depending on year and so on. Now I know that the t-bird went from Mikuni to Keihin...what about the TBS? Did they stick with the same? Which one in that case? Does it matter? Will the rubber with no matter if its a mikuni or keihin?

The first thing is to determine if you've got the restricted carb rubbers. They were only installed on the Mikuni carbs, so if you've got Keihins you don't need to change anything.

To double check, look for dimples in the sides of the carb rubbers about the diameter of a cigarette. If there are no dimples, you don't have the restricted carb rubbers.

The carb rubbers for the Mikuni and Keihin carbs are supposed to be slightly different lengths and diameters, so it's probably a good idea not to mix from one carb type to the other. (Haven't checked that personally.)

I believe it was the Super3 or Speed3 that used the unrestricted rubbers so have your dealer check on those for the same year of your bike.

Also, the dimple might be shown in the fiche or computer, but I'm not certain of that.

Jim

Spooner · 08-10-2005, 02:29 PM

Quote:

The first thing is to determine if you've got the restricted carb rubbers. They were only installed on the Mikuni carbs, so if you've got Keihins you don't need to change anything.

To double check, look for dimples in the sides of the carb rubbers about the diameter of a cigarette. If there are no dimples, you don't have the restricted carb rubbers.

The carb rubbers for the Mikuni and Keihin carbs are supposed to be slightly different lengths and diameters, so it's probably a good idea not to mix from one carb type to the other. (Haven't checked that personally.)

I believe it was the Super3 or Speed3 that used the unrestricted rubbers so have your dealer check on those for the same year of your bike.

Also, the dimple might be shown in the fiche or computer, but I'm not certain of that.

Jim

Hmm..let me get my head around this, with your help I hope. I thought we were talking TBS carb rubbers...what's super3 and speed3?? I guess you're talking Speed Triple...but would those rubbers also fit??

I have the Mikuni carbs on my 97 (actually late 96 but not taken out until 97) T-bird. Will the dimples show on the outside of the rubber or just on the inside?

Oh dear I feel dirty talking about these dimpled rubbers...but but...anything for xtra horsepower!