1964 honda C100 cub 50cc step through not starting

Question edited for clarity.
Question moved from Honda Cars.

I haven't seen one of those for 40 years!

The Braided cable goes to battery negative -
They normally have a Red Cable to the battery Positive +
And if I recall, there is an inline fuse in the positive?

Here is the cable

https://www.ebay.com/itm/NOS-OEM-Honda-Cub-50-70-C70-K1-C50-C65-M-CA102-C102-Cable-Earth-Battery-Ground-/172214475304?_ul=IN

and here

https://www.ebay.com/itm/225016392400

Service manuals x two :>D

Honda C102 Service manual

Honda 4-stroke.net https://4-stroke.net > honda-c102 > downloads > 440-...
You can go to our downloads and grab yourself a copy! Download the Honda C102 Service Manual in the following format: pdf Service manual for Honda C102 (1.93 MB).

• 
  

  Workshop manual for Honda C102 (1961)

  https://4-stroke.net > honda-c102 > downloads
  You can go to our downloads and grab yourself a copy! Download the Honda C102 Service Manual in the following format: pdf Service manual for Honda C102 (1.93 MB).

Service Repair Manual Honda C100, C102, C50,C70, C90

Blogger http://myhondac100.blogspot.com > 2013/10 > servic...
Oct 21, 2013 - Service Repair Manual Honda C100, C102, C50,C70, C90. http://www.servicerepairmanualonline.com/4449/honda-super-cub-50-c50- ...

problem in the carby
could be water but most likely is dirt in the main jet or needle and seat a carby overhaul is in order

Hi have u tried cleaning the carby & the jets in it .U mention it won't (FIRE) do u mean it.wont start or do u mean there is no spark. . Cheers.

Hi have U checked the needle ,& seat in the carby it is possible it's jammed closed if so it will not let petrol in .. Cheers

Make sure u have right gas to oil mixer.

fix the choke to work properly for starters next if you still have the original cast iron manifold then get the butterfly in the exhaust to work as well. It heats up the inlet manifold which helps to vaporise the fuel

Have you ever seen a fuel drain on anything
but power equipment, small engines

I assume you have & are looking at a tripower
carb set up

Why would you need a drain?

I was around & had brand new 65 vette,327/365 carb

I never bought the 1964 GTO, because I wanted
the HI Pro 421 & it only went to the nascar & professional
super stock drag teams.

it sounds like a fuel problem.
first drian fuel out of tank.
i know you have already cleaned the carby but dis assemble carby and clean with carby cleaner.
re assemble carby & fill tank with fresh fuel.
also clean air filter & check oil level & check spark plug,if the spark plug is black and the tip is blocked with oil build up, then replace.

carby

Hi and welcome to FixYa,

Your post, there is spark, there is fuel to the carb; additional initial checks:

• determine if their is fuel inside the bowl of the carb by loosening the drain screw and determining the quality and quantity of the drained / collected fuel;
• determine if there is suction/vacuum by closing the carb opening with your palm. it should get wet with fuel on cranking/starting;
  
• check for compression. Temporarily remove sparkplug, replace it with compression gauge and crank/start engine with throttle wide open (WOT);
• check if the sparkplug gets wet with fuel.

Another possibility is that there is stale 2T oil in the crankcase below the piston. This would prevent ignition as the air/fuel mix inside the combustion chamber would not fir.

Good luck and thank you for asking FixYa.