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?
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 :
Amal type Mk II
Main jet
Needle jet
Needle type
Needle position
Throttle valve cuttaway
Starter jet
|
R2930/1 L2930/2
200
.105 (2928/030)
2C3
2
3
50 |
.........................................................................
ok so I cant get the table to line up, you can figger it out.
http://www.t140.com/views/mk2.html
|
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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