T Mack 1 - FSO
Serious Thumper Alliance Member
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sold 2001 LS650 for a 1986 XLH1100
Posts: 2919
Emmaus,Pa
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Remember that the carb basically has three fuel circuits. Low speed, mid and high. For the low, the pilot jet and air mixture screw (pilot screw, low speed mixture screw ....pick one). Then for mid-range the needle comes into play. After that is the main jet.
So, if you can idle with the choke on but not without it, that means you need more fuel at low speed. I would adjust low speed mix screw in both directions to find out where the "too lean" and "too rich" points are. If you can't get to the too rich point, then either there is small amount of unseen dirt (Holes are small, doesn't take much) or the mod's done before you got the bike require more fuel (because it's getting more air now) and you need a bigger pilot jet.
Next, sounds like it bogs when you hit the throttle. Well, that is the hard one to diagnost. If it is just above idle then it's the needle circuit (diagphram/slide assembly thingy). IF you are bogging down due to too much fuel, the spark plug will be getting black. If you are bogging down from lack of fuel, spark plug will be clean(er). Lack of fuel would be a modification of the white spacer. Too much fuel I think is diagphram (never had to play with this so the forum may need step in here).
If you get the bike rolling but bogs when you hit the throttle to get into traffiic, then would be in main jet circuit. Puff's of black smoke when rev'ing are an indication of too rich. Too lean would manifest itself in multiple ways (blue'ing pipes, back firing (w/ no smoke). Spark plug again is your eyes as to what is going on inside the chamber.
Hope this helps you look at the correct circuit to concentrate on.
I would first get the bike to idle without the choke.
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