Emulsion tube and needle question - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 18 (permalink) Old 10-01-2019, 06:12 PM Thread Starter
Minitwins
Main Motorcycle: 1993 triumph trident
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Emulsion tube and needle question

Hi All,

I am in the process of getting a 1993 triumph trident (serial 001053) back on the road after 8 years of standing forgotten. Among other things, the Mikuni BST36 carb is completely gummed up and the needle shows significant wear. most of the internals will be changed.
but I have a doubt regarding the emulsion tube. I find two different emulsion tube sizes mentioned, O-6 and O-8. The bike is completely stock from air intake to exhaust. Can anyone confirm which emulsion tube was used on these serial numbers? I doubt the difference is generally noticeable but....

part numbers
784-232103-O-8
784-232103-O-6
needle J8-5E56

Thanks in advance,

Leon
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post #2 of 18 (permalink) Old 10-03-2019, 02:07 PM
Grand Prix 125
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Hi Leon, I'm in the USA and using 2wheelpros.com website. Triumph didn't bring their bikes to the US until 1995 so their listing stops in 1995 and your 1993 might be different but I doubt it.
The 0-6 emulsion tube goes into carb #2
The 0-8 emulsion tubes go into carbs #1 and #3
Hope this helps,
Greg
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post #3 of 18 (permalink) Old 10-04-2019, 04:13 AM Thread Starter
Minitwins
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Hi greg,

Awesome. I can not read the writing on the tubes but with your info I should be able to make sense of it. A lot of contradictoire info on the net.

Thanks


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post #4 of 18 (permalink) Old 10-04-2019, 09:30 AM Thread Starter
Minitwins
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Incidentally, does anyone have info on the reason why the middle cylinder is set leaner than the outer two?


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post #5 of 18 (permalink) Old 10-13-2019, 09:23 PM
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Center cylinder is set a bit leaner because the air flow through the stock air filter to the center cylinder is more restricted than the two outside cylinders

Dave
'98 Sprint Sport
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post #6 of 18 (permalink) Old 10-13-2019, 11:04 PM
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Needle wear is not uncommon on these bikes with BST36's. ...J.D.
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post #7 of 18 (permalink) Old 10-14-2019, 05:06 PM Thread Starter
Minitwins
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Hi All,

Dave, thanks for the clarification on he lean cyl 2 situation (it did take me a while to get my head around it.)

Would it be fair to say that the general consensus for the "best" carb set up on a stock bike (I am including M. fitzwater's advice) is as follows:
cylinder 1 and 3:
needle: 5E56
emulsion tube 784-232103-O8
main jet 130
idle jet 40

Cylinder 2:
Needle: 5E56
Emulsion tube -O6
Main jet 125 or (127,5??)
idle jet 40

2-2,5 turns on the air mix to get the CO level to around 3%

I am writing this now from memory and I know this is not the stock set up but supposedly this is the set up which flattens out the midband power curve a bit and makes the going just a tad better.

Do i have this correct?
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post #8 of 18 (permalink) Old 10-14-2019, 05:08 PM Thread Starter
Minitwins
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Quote:
Originally Posted by Wire-Wheels View Post
Needle wear is not uncommon on these bikes with BST36's. ...J.D.
The bike has 52000 on the clock and the wear on the needles was significant . a proper "fingernail catch" kind of damage
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post #9 of 18 (permalink) Old 10-14-2019, 11:13 PM
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Hi Vaporlock, Emulsion tube is made of brass, the needle is made of stainless steel. Guess who wins that battle? It take about 60,000 miles and then the emulsion tube starts to oval from the constant rattling of the needle inside the tube. I've got the main jets on my Trophy all the same. 127 were a bit rich and 125's in all three carb gave a nice toasty look to the spark plugs. Same settings on the needle clips, the middle notch. Now this is with stock Trophy mufflers. Other mufflers will require something different. As for #2 cylinder carb being leaner I wonder what's up with that. Are they leaned out on # 2 to comply with gas emission numbers? Watch for the color on the spark plugs.
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post #10 of 18 (permalink) Old 10-15-2019, 12:26 PM
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If you put a vacuum gauge on these engines at an idle, you can see why you get a lot of wear. The needles are constantly on the move at idle due to vacuum pulsations cause by cam overlap. The problem is probably more pronounced on the engines with hotter cams. My solution is to install a balance tube between the carburetor vacuum ports. The idea is to negate some of the pulsing. I have two of these engine. Both set up like that. One I have run that way for almost 17 years. ...J.D.

Last edited by Wire-Wheels; 10-15-2019 at 12:32 PM.
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