opinions needed Triumph carbs

F.U.Jay said:

I like my Mikuni setup from MAP on my 69 TR666... Its basicly the same Sudco setup that Copper is talking about...But it comes with a shortend manifold.. But i will admit I had to change the needle and shave the slide a little... She rides like a raped ape now... FUCK AMELS!!!!

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What ever dude !!! Amals rule you just have to be smarter then them .

76tri said:

So now i am totally confused, One guy i talked to said slides, the next guy says mains, Any idea's? my mains seem to be spot on, top runs great, pulls hard, will reducing them help rid my bike of the low end richness?

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ok, I was confused when you first posted : "... MK II carbs and can not get them enough," but I see now, wet at low-end.

also note most input here so far is re Concentric experience vs mikuni, the Mk II is a superior carb to Both.

just going by your (local) advise, $200 for just new slides seems extreme; also have you moved the needle lower into the jet (clip higher position) to lean it ??

and I am recalling a persistent plug-wetting problem some time back on my '79 T140D with a boyer, I had to carry spare plugs everywhere. Take a close look at the starter plunger/enrichner/cold-start circuit, especially if they are still linked together off of one lever, OR if you have non-stock rubber runners.

but if you have Mk II's on an earlier than mid-'78-up it is not stock.

anyway, my rich condition was caused by worn cold-start plungers, but still ran great mid & top due to the Boyer.

I checked early in the week & they had nothing listed, but I'll keep
checking, Dennis Kirk has an ebay store that occassionally has a huge stock of Amal parts, pieces, jets etc; recently I bought a brand new pair of 34mm Mk II's for $225. might get lucky and source you some different slides, I'll let you know if they list another batch.

For general ref, here is a good chart/info on Mk II's :




and here is some discussion of setting up Mk II's on Bonneville Specials, like my '79 : http://www.britbike.com/ubb/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=11;t=002226;p=1&r=actu

I do believe you're having the same condition I was, the low-end fouling from leaking starter plungers . DO beware just changing plugs & keeping running tho, that much gas washes past your rings & thins your oil.

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Comon problem with the MKII rich on bottom . There is 2 spots for the pilot jet to sit . One is in the float bowl and the othe is in the traditional place on the air filter side of the body . Somtimes when they get rebuilt or built in general they miss putting the plug in place of one of the polit jets . If you remove the float bowl and turn the carb over you should see a small aulim. plug slightly off center and between the main jet and the air box side of the carb if there is a threaded hole you will need to remove the pilot jet from the floatbowl housig and reinstall it there . then use epoxy to plug the hole in the float bowl housing .
If you look at the pics posted you will see the 2 pilot jets although one of them has no hole .
And on Concentrics that run rich on the low end check for a pilot . They say the new amals are bushed but I have found some that arn't ( by milling a brand new one into the idle circut showing no bush installed and sending back to prove a point ) so by installing a pilot jet you can better tune the idle circut ( even if the carb is bushed a pilotjet will lean the bottom out ) . Also check the mixture screws if you are running twin carbs and make sure the tapers match . When the float over flow and the needle sticks that is common to . The needle seats machining is not the best so by taking some tooth paste on a Q-tip you can lap it smooth to a good seal .