carb repair

[stl]

Tommorrow I am finally going through with my carb rebuild but before I do I have a couple of final questions. My 1964 Johnson 5.5 hp cd-21a has a set high speed orifice. It contains a plug instead of a needle, right ? I am following a Seloc manual. My question is when you replace this plug do you still use the three packing washers and the little plastic washer even though there is no high speed needle? When it comes time to make adjustments, while the motor is running, I guess you only adjust the low speed needle valve? This final adjustment seems rather complex. Is it as bad as i think it is? thanks for any input.

 

[WillyBWright]

Re: carb repair

Nah, they're really simple carbs. The main jet is way in the middle. You'll see it once things come apart. It screws into the drain hole until it bottoms-out. They can be very difficult to remove and you don't need to try. The drain plug only has a gasket, so you won't need that packing for anything but the idle jet. With that in place, let the bottom of the bowl soak in carb cleaner for awhile. That should loosen-up any varnish. Then finish cleaning it. If you have a pipe cleaner, that will help. Be careful not to damage the jet (it's brass).<br /><br />I use Berryman's B-12 carb spray. It's cheaper than Gumout and way better. You can get it at Walmart. The idle jet adjustment should be around one turn out. There will probably be a mark on the brass throttle advance cam. The mark should line-up with the roller when the carb starts opening. About the only trick involved in this whole process is to allow for slop in the linkages. It's not when the roller makes contact, but when the linkage begins to open the throttle that the mark should line up.

 

[stl]

Re: carb repair

Thanks, to everyone that talked me through the carb rebuild. She's purring like a kitten.