From:Dave Hennessey e-mail:dave-A-toyhouse.org
Subject:RE: RE: RE: 1959 Hummer power delivery problems Date:Fri Jan 13 13:43:31 2017
Response to:21734
Here are the carb adjusting instructions.

You really need to get a service manual - Part# 99444-93, available from your local Harley dealer - has a parts catalog and service manual - $40. Check over on the Parts page, under Harley-Davidson.

Power problems might also be carboned-up muffler, crankcase seals, or worn out rings.

Start with simple things like new spark plug, checking the condition of the points and setting the correct gap (light filing if necessary to clean them up). Clean the carb (maybe crud in the bottom of the float bowl) and adjust.

None of the above - take the muffler apart and clean if it's all plugged up with carbon. Then it's on to the complicated stuff like piston rings and crankcase seals.

Good luck. When you report back, tell us exactly what kind of "Hummer" you have.



----- ORIGINAL MESSAGE FOLLOWS -----
No rebuild as far as I know. Only had it a couple months.

----- ORIGINAL MESSAGE FOLLOWS -----
STEVE;

HAS YOUR ENGINE BEEN REBUILT?? IF SO, HOW LONG AGO.
YOUR DESCRIPTION OF TROUBLE SOUNDS MORE LIKE THE LOWER END
NEEDS ATTENTION.

DUANE TAYLOR


----- ORIGINAL MESSAGE FOLLOWS -----
My Hummer is very sluggish and won't get much over 30mph
downhill (180 lb. rider).
Replaced: fuel hoses, petcock, gas cap, float bowl gasket,
spark plug
Cleaned: gas tank, carb, jets, float, et al

Problem: idles fine but does not deliver crisp power response
when throttle is twisted. Especially bad when in gear.
Very, very sluggish. Runs much better when partially choked.

Questions: which screw on the Tillotson M43B does what? I'm
assuming I have a mixture problem (air/fuel) but I'm really
not experienced enough to know if it isn't something else.
What are standard start-out settings for the screws? I can
see 3 that can be adjusted besides the throttle butterfly
stop screw.

If I can't figure it out my next option is to take it to a
small engine mechanic that specializes in two stroke
motors/carbs. Don't really want to do that just because I'm
stubborn ;)

Thanks in advance.

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