Motorcycle Repair: 1970 Honda CL175, honda cl175, point gap

Question
QUESTION: Hey wayne, I have been working on a 1970 Honda cl175.I got the bike running and running good. After running for a few minutes it seems as though one pipe is hot and one is not and it lacks throttle response. When it is cold it runs and idles fine. I have cleaned the whole fuel system and set the carb floats to 21mm,restored the tank, replaced the spark plugs and wire caps. I checked the point gap and it is .014. There is no slop in the cam. I am getting kinda stressed over here, the thing runs great at first and then just goes to crap. I do notice that the oil has a slight smell of gas and some light colored smoke comes out of the exhaust. I pulled the plugs and they are black as night.I don't know if I am fouling plugs or could it be a condenser problem or spark advancer problem. I just want to get the thing running consistantly at its full potential,thanks.

ANSWER: Evan,

-double check the choke, air filters, and
-make sure the carb throttle slides have not been mixed up.
The cutaway part on the slide goes to the back
or rear of the carb or bike.
-If you have a choke lever, up is choke, down
is choke off on some of these older carbs.
-Make sure the carb floats float, in other words
make sure they have no pin holes that
cause them to fill with fuel and sink.
-Make sure the timing advance unit is not
seized up (behind the points)


---------- FOLLOW-UP ----------

QUESTION: already went through all that stuff. this is something it was doing prior to me going through the fuel system. Now that that is all clean I am thinking it could only be an ignition thing. What do you think? I started it tonight and it was doing the same thing and running on one cylinder and then POOF! all of a sudden the left cylinder started firing again.I don't know if pionts would cause this or coil or condenser or what.Makes it a little hard to fine tune when one cylinder is a part time employee Ha Ha. I am getting points and a condenser this weekend, do you think this will help motivate that cylinder to be full time? Thanks, Evan w/ the 1970 cl175

Answer
Evan,

-is the compression good on both cylinders?
-Black plugs usually indicate way too much
fuel or plugged air intake.
-Have you tried it with the air filters off?
-New points won't hurt, make sure the
point contacts are polished clean,
they may have an oily coating when new.
-If you are getting new points, it wouldn't
hurt to experiment with different
point gaps or filing the old ones
to see if it helps the lazy cylinder.
-Check your plug wires and caps,
the caps should not be over 5000 ohms.