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36 A Carburator

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Bud

07-04-2002 12:20:43




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I seem to be having problems getting gasoline to my engine when its cold. Once started it runs fine but its a bear to start and after major choking the plugs are still dry.

I pulled the carb apart but everything looks fine to the uneducated mind. Does the the nozzel that mixes air with gas ( inserts through the bottom and has a row of holes in the side ) have to be oriented in any particular way? It appears to be designed to just float on the spring.

Fuel flows well into the float bowl so the inlet filters are fine. It has a brass float and it moves freely with the valve seating when the float is horizontal best I can tell.

Any suggestions on what I may be missing will be appreciated greatly.
Thanks
Bud

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Clooney

07-04-2002 15:39:37




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 Re: 36 A Carburator in reply to Bud, 07-04-2002 12:20:43  
Bud, make sure the choke is closing COMPLETELY. Sometimes the plate is bent & won't close completely.
~If that is ok, make sure you don't have a leaking gasket between carb & manifold, & that the throttle shaft bushings are reasonably tight.
~If all ok there do a cold compression test, low compression won't pull very much vacuum while cranking [if the compression is low put some 2-cycle oil in the gas tank with the gas, that will help the rings seal better at slow cranking speeds].
~The load nozzle has no orientation & just sits on the spring. All those holes do is turn into an air bleed holes once the acceleration well is empty.

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Bud

07-04-2002 18:13:08




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 Re: Re: 36 A Carburator in reply to Clooney, 07-04-2002 15:39:37  
Clooney
The choke and throttle plates seem fine. Also there is a good gasket between the carb and manifold so I assume its not leaking. In checking compression do you do it like on a car? ie pull both plugs , open choke plate and then turn over engine? If it means anything there appears to be very good compression based on effort to hand crank with the petcocks open and the air expelled through the cocks. My tester doesn't have an adapter for the large plug openings so I will attempt to borrow one somewhere.

Is there anything in the carb other than the plates that could be the problem? I checked everything I could and it all seemed OK but there are a number of small passages that could be blocked I guess.

By the way how much 2 cycle oil should I add to the fuel?
Thanks
Bud

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