Amal MK2 Carb T140E Jet Confusion - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 17 (permalink) Old 08-14-2014, 11:31 PM Thread Starter
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Amal MK2 Carb T140E Jet Confusion

I have a 1978 T140E. The Amal MK2 carbs are in rough shape and impossible to tune. Itís to a point where it makes more sense to just replace, rather than rebuild them.

When I order the new carbs I need to specify the jets, needle and slide I want. Iím confused because 1978 Triumph parts manual (T140E supplement) specifies one thing, while the 1979 T140E manual another. The 1978 manual calls for the needle jet to be a .105, pilot jet 25 and the starter jet to be a 50. The 1979 manual calls for the needle jet to be .106, pilot 20 and the starter jet to be a 35. As far as I know, the 1978 and 1979 T140E engines were identical, so I donít understand why these jets are different. Did they learn something between the publication of the two manuals? Would I be better to go with the 1979 specified jets, or should I stick to the original í78 recommendations?
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post #2 of 17 (permalink) Old 08-15-2014, 12:10 AM
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Although I have no personal experience with the T140, or the Mk ll carbs, from what I recall the E suffix referred to "Emissions" Therefore I would assume the 79 specs would be more restrictive than the 78. I would go with the 78 spec. carbs.


Alan.

Last edited by House Hubby; 08-15-2014 at 12:16 AM.
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post #3 of 17 (permalink) Old 08-15-2014, 05:05 AM
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There was European jetting and US jetting and changes made to very late models, apparently.


I refer you to J Healy, here:
http://www.britbike.com/forums/ubbth...752#Post121752
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post #4 of 17 (permalink) Old 08-15-2014, 05:38 AM
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When I rebuilt my T140E I used the 2C3's and .105's it ran okay but seemed to feel restricted, after much experimenting, I went with the 2A1's and .106 and the difference was night and day, needless to say I have stayed with this combo. (I am running peashooters with no balance pipe and T120 cams).
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post #5 of 17 (permalink) Old 08-15-2014, 11:05 PM Thread Starter
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Thanks for the help. The Healy post was very helpful. Considering my bike is stock, standard exhaust system and cams, I'm going to go with the stock '78 setup. I know it will provide a good starting point and I can always make minor adjustments from there.
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post #6 of 17 (permalink) Old 08-15-2014, 11:16 PM
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There were some problem's with the jetting when these were new also plug fouling.

To eliminate problems use the jetting as shown in the thread listed by Triton Thrasher.

Just wondering did you make the Bike show last week end at MCC.


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post #7 of 17 (permalink) Old 08-16-2014, 02:11 PM
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The stock "US" jetting works fine with the factory mufflers and air cleaners. I ran it for years with no problem. When I went to more open peashooter mufflers and uni foam aircleaners I switch to the "European" jetting and that also works fine with that configuration.
Run N5C Champions or equivalents not N3C's in the 1978&1/2 and later t140e and d bikes with the parallel port heads and Mark II's. Less fouling problems.

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post #8 of 17 (permalink) Old 08-17-2014, 11:10 PM Thread Starter
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Quote:
Originally Posted by KADUTZ View Post
2wheel

There were some problem's with the jetting when these were new also plug fouling.

To eliminate problems .

Just wondering did you make the Bike show last week end at MCC.


K
". . .use the jetting as shown in the thread listed by Triton Thrasher" EPA or non-EPA (Euro)?

As recommended by htown16, I'm thinking the stock "US" jetting is probably the way to go.

I did make the MCC show - a lot of great bikes and good conversation!

Last edited by 2wheelride; 08-17-2014 at 11:13 PM.
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post #9 of 17 (permalink) Old 08-18-2014, 05:22 AM
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you'd get better performance with the European jetting
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post #10 of 17 (permalink) Old 08-18-2014, 06:57 AM
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If it were me I would be using the jetting as recommended by Triton Thrasher. That is same I was going to post. John Healy is very wise in the ways of Triumph.

I enjoyed the show also have been to 22 out of the last 23.

Since your in the area you might want to consider joining the sponsoring club.

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