99 Sportsman 500 carb
#1
99 Sportsman 500 carb
Good evening. The engine was becoming a little hard to start so I removed the carb for cleaning. Mikuni 34 I believe. I removed the pilot screw from the bowl area during dis-assembly and thought I correctly counted the rotations, but now the engine idles quite high. I then read the manual (a little late) which says don't remove it. I'm looking for the correct number of turns on the pilot screw from the closed position. Thanks.
#2
Welcome! The "pilot jet" along with the main jet tightens down snug.Also make sure the throttle cable has only 1/8" slack at the thumb lever and not tight which can cause idle problems. "If" your talking about the fuel/air adjuster screw under the aluminum block off plug,just turn out 2 turns from a lightly seated position as a base setting. Adjust the knurled idle screw until you have about 1000-1100 rpm idle. Warm the engine up and if you have a carb adjuster or small hands and a small screw driver you can fine tune the adjustment. Turn out a little at a time(counting the turns) until the rpms change,then back in until you hear a change (again counting the turns) and set the mixture screw between both points to where you have a smooth idle and good throttle response.You may have to play around a little with this. OPT
#3
I'm talking about the pilot screw, not a jet, and it is contained within the float bowl chamber and is an adjustable mixture screw, but can't be adjusted once the bowl has been put back on the carb. This is the first Mikuni I've ever run into that has an adjustable screw within the float chamber, and it's got me perplexed as there is no more adjusting it once the carb is assembled.
#4
I'm talking about the pilot screw, not a jet, and it is contained within the float bowl chamber and is an adjustable mixture screw, but can't be adjusted once the bowl has been put back on the carb. This is the first Mikuni I've ever run into that has an adjustable screw within the float chamber, and it's got me perplexed as there is no more adjusting it once the carb is assembled.
OPT
#5
Yep, it's #30 on the diagram. Follow the line upward and notice it goes right in to the float chamber. The repair manual calls it a pilot screw, but it's a typical idle circuit screw - pointed on the business end.. It is the original carb. What is not typical is that it is in the float bowl or chamber. Got me also, I've never seen one like it and I've been into a lot of Mikuni's, mostly on outboards. I appreciate you trying to help me.
#6
Yep, it's #30 on the diagram. Follow the line upward and notice it goes right in to the float chamber. The repair manual calls it a pilot screw, but it's a typical idle circuit screw - pointed on the business end.. It is the original carb. What is not typical is that it is in the float bowl or chamber. Got me also, I've never seen one like it and I've been into a lot of Mikuni's, mostly on outboards. I appreciate you trying to help me.
OPT
#7
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