High Idle issue

So earlier I posted about rebuilding a set of carbs, then could'nt get them to work so I cracked open the old ones cleaned em out pretty decently and slapped em back on the bike. The bike will crank and run with these carbs but will only stay running about 2k, anything lower than that it dies off without some help from the throttle. Also, when you pull back on the throttle and let go, the rps stay high for a few seconds and then slowly returns to 2k. I was advised about oiling th advancer but I think its something to do with the carbs b/c my dad owned these carbs before I did and he did some drilling on the needle jet it looks like. Would this cause too much fuel to be tossed at the engine and cause the throttle problem? Theres no hesitation when you twist the throttle, only when you let go and want the rpms to come down. Any clues on where to start or if I should replace the needle jets? Thanks.

First you tell what carbs you're using now. Then start checking for vacuum leaks, and possibly a hanging throttle/ cable.

Oh sorry, I let my frustration get the best of me. They are Mik's BS34's. Pods and 4into1 V&H exhaust. I don't have vac leaks and the throttle cable was the first place I checked for this problem. Someone told me today to start with my float levels, mark a line inside the bowls and check em at 3mm below the gasket. Someone else suggested the clear tube method. Not sure which is the right way. I will do this tommorrow. This bike is a tough customer after the winter, but once she gets going she runs good. The bike by the way is an 82 1000J.

I have the same bike and HAD the same issue.If u really clean the BS34 pilot circuit well,the idle issue should be remedied.These bikes run on the pilot circuit until about 3/4 throttle.If u dont get that circuit really clean,the bikes idles rough and stumbles when u leave a red lite-not good when ur trying to show up a Hardley.Lol.bj

Fozzie wrote: ...Someone told me today to start with my float levels, mark a line inside the bowls and check em at 3mm below the gasket. Someone else suggested the clear tube method. Not sure which is the right way....

Measuring float heights is a crap shoot.
Maybe the resulting fuel level will be within specs.
Maybe it won't.
And more often than not it isn't.

Clear tube test is the true actual visually observed fuel level inside the float bowl.

Good Fortune!

i need to figured out this clear tube method....

wheres my manual

Ok so I've got the carbs off and looking at them. My plan is to pull the pilot jets and clean em up. If I spray cleaner into the pilit jet hole (?) where should the spray come out of? Also, is it a problem if the plugs that go over the pilot jet are kind of loose? Also I had the filters off of the carbs while it was running, and without any throttle there was gas puddling up around the needle jet, would that also be a cause of my high idle issue?

Yeah I know I know...I'm becoming worrysome...so I now have another question. I understand the pilot jets control idle to 1/8 throttle. Slides jet needle position and needle jet control 1/8 to 3/4 and main takes up the rest. So is there an adjustment for the pilot jet? I thought the mixture screw is where you make the adjustment. Do you just run the pilot jet all the way down or do you have to back it out a few turns? Carbs are going to be the death of me....And my high idle issue, could it be fuel being pulled up past the jet needle? I took a peek under there while i was idling wildly and notcied fuel puddling up from around the needle.

Soo I'm still having problems. I have tore down these carbs, pulled everything apart soaked, cleaned, scraped and meticulously inspected everything for problems. I reassembled everything and slapped it back on the bike. The bike cranks right up but goes straight to 5k immediately. On choke it hangs around 1 to 1 1/2k then as it warms up it gradually makes its way to 5k. I Have backed the idle screw all the way out, did the wd40 trick around the boots looking for leaks. Also just to recheck I hooked up the number 1 and 4 to a "T" (goes to smog thing i guess), number 2 on the petcock and 3 is plugged. Sound right? It ran like that last summer just fine. I also checked the points or the ignition advancer and it looked a bit rusty but I turned the engine and everything moved, no binding. I also took a piece of sandpaper and cleaned the two points. I dunno where to start next or what to check next. Can anyone help? I'm fried on this one.

'82J has points?

Fozzie wrote: Ok so I've got the carbs off and looking at them. My plan is to pull the pilot jets and clean em up. If I spray cleaner into the pilit jet hole (?) where should the spray come out of? Also, is it a problem if the plugs that go over the pilot jet are kind of loose? Also I had the filters off of the carbs while it was running, and without any throttle there was gas puddling up around the needle jet, would that also be a cause of my high idle issue?

Needle and seat leaking?

I assumed that they were points? Has a thing in the middle with a lobe on it that passes two metal points located directly across form each other. I removed the plate that has these two things attached to it and underneath is the centrfugal thing with springs on it. I rechecked the leaking issue around the needle, not leaking anymore.