Pilot screw was set to standard 2 out and ive played with it both ways no luck. With these the seat must be cleaned, polished and inspected. It takes two revolutions to complete the four strokes, or one-half of a revolution to complete one of the four strokes. Set the air screw to the number of turns also stated in the manual. The Honda Express throttle cable curves rearward and loops downward to get below the carburetor, and then goes forward into the frame tube. Strong solvent is needed to dissolve varnish or tar residue left from years of sitting. By the way, the pilot jet always supplies its fuel no matter what the main jet is doing.
Be careful that you don't smash the plastic starter cap nut, it's 12 bucks for a new one. So these numbers are only to illustrate the relative difference in volume from idle to redline. At idle it's around 11 times a second. Mixed results have been reported with it. When the throttle is opened, the slide moves up and the main jet opens allowing more fuel to enter the throat. Idle Hole Cleaning: Near the engine side of the carb body is a brass tube that dips down into the liquid gasoline. The flange shrunk in 1979, from 38 back to 32.
Clean and inspect the needle extending from the bottom of the slide. If the level is too high, it can cause a rich condition, too low and it can cause a lean condition. When the diaphragm valve is fully raised and the needle is at it's farthest point out of the needle jet, the Main Jet size has the most influence on quantity of fuel delivered. To compensate for this there's an air jet in the lower diaphragm chamber that transfers ambient pressure to one side of the coasting enricher's spring loaded cut off valve. Float: In 1979 the float and float needle changed, from stirrup-type needle valve with black foam float, to no-stirrup needle valve 16155-883-005 with white plastic float 16013-147-004. Keihin F4A carb, flange mount Carburetor: 9mm F4A 1970-74 Carburetor: 10mm F5A 1970-74 Main Jet: 55 F4A , 62 F5A Idle Jet: 35 Needle Jet: 2. Clean and check it for wear.
Now blow compressed air into the same holes to ensure that they are clear. See the jet drills below, buy a 75 drill 0. You have two options; 1 buy a new one or 2 buy a carb jet cleaning set offered in Dennis Kirks Catalog. The motorcycle carburetor is a very touchy device that can cause all kinds of trouble if mishandled or neglected. Drill out the cap on the pilot screw.
Keihin Z502 on 045 1968-71 Honda Z50A Mini Trail 1968-71 Z50A carburetor Main Jet: This carb has a screw-in main jet 50. It can be found under a rubber plug and has a slotted head that can be screwed out. They may be screwed in they have a hex shape top or pressed in round top shown above. A chamber set includes the float bowl, float gasket, drain screw, and drain screw o-ring. Always remember to remove all rubber things first, to not let the rubber touch the solvent. Keihin carburetors are constant velocity carburetors.
Pilot Jet: The idle jet is not replaceable. Carbs Carburetors The name itself comes from the first carbide lamps that used a small hole to drip water on carbide rocks. Top Cap: At some point the Z50A top cap grew from M18-1. It is inside the upper end of the brass tube, pressed into the main body, on the engine side of the main jet. If the air screw turn value is not available, use the number you noted when taking it out. Instead the o-ring groove is on the intake manifold. An idle fuel screw blocks off a fuel tunnel.
Cable Differences: You can tell what year range a Honda Express is from a distance. Loosen the wiring clamps so there is slack in the wires. When it gets clogged the engine will only start easily when it is warm. Adjusting these devices controls how much air passes and thus the position of the throttle slide and main jet opening because of the needle position. It is inside the upper end of the brass tube, pressed into the main body, on the engine side of the main jet. Some bikes have a secondary jet that supplies fuel in an intermediate range between idle and higher throttle settings.
Float Seat late: The 1974-75 carburetor did not have a replaceable float needle valve seat. If one is clogged there is little to do but soak and blow since most of the channels make right angle turns and pushing through a wire is not possible. About the only part on a carb that wears out is the throttle slide bore, think of it just like your cylinder. Float: non-stirrup type white plastic 16013-147-004 see 6-4. Like before, the float needle has a rubber cone upper tip and a spring-loaded lower tip. Time to get your hands dirty.
All of the other parts are the same. So I need some help dont feel like messing with it and putting that damn gasket back on the bowl. The only difference must be the venturi shape or size. Some of the older carburetors you can remove them the same as fuel jets. But some pressed-in idle jets have thin walls, or have a tighter fit that needs heavy clamping. Other times they will be pressed into the offices of the carburetor and the whole earth are inserted through will be plugged with a brass ball. I always use never-seize on any airscrews and suggest it to everyone.
It is a very flat design. You can follow any responses to this entry through the feed. It has the same white float, non-stirrup float needle, fixed jet, 18mm top threads, and same gaskets. The size is the same as the screw-in jet 58, 0. Make sure it is clean. Which by the way has the wrong pilot screw the one they offer has a really fine thread pattern not like the origional. If it doesn't, pull it out and try again.