misfiring

[pisten-bully]

This looks interesting and the idea of a higher quality capacitor makes sense. Do folks think this is a worthwhile upgrade?

Jason's idea, I'm just throwing new parts at a problem I can't figure out!

See this topic: https://forum.antiquemotorcycle.org/...ers&highlight=

[pisten-bully]

Did your swollen float look like this?

...not really, it's more like a hard foam where you can see the pores, looks and feels like 400 grit wet/dry sandpaper. Current I.D. is 1.643, O.D. is 2.475...and I'd love to know that this may have been the problem!

[Lipdog]

Oh, and I also received and installed the Thor Cap capacitor that Jason showed us!

This looks interesting and the idea of a higher quality capacitor makes sense. Do folks think this is a worthwhile upgrade?

[T. Cotten]

If there was no script on the bottom, Harry,...

Did your swollen float look like this?

Just guessing...

....Cotten

[pisten-bully]

Parts are taking a while to get these days, but I received a new float on Saturday, Rubber Ducky from Greer’s, and installed it. I had previously removed all the plugs and the nozzle, passed a pipe cleaner soaked in acetone through them all then blew them out, then all back together with the new float. Sunday I took it on a 15 mile ride, close to home, and it ran well after dialing the carb back in. This morning I ventured a little further and got in a 65 mile ride, again with zero misfires...bike ran very well.

I keep remembering the recent incident where I got 90 miles out and it started misfiring and I couldn’t make it home....so I still don’t trust it fully or trust the idea that the float was the problem all along. But someone said most electrical problems are fuel related, and most fuel related problems are electrical.

More miles after this weather blows through!

Oh, and I also received and installed the Thor Cap capacitor that Jason showed us!

[T. Cotten]

Brilliant! Thanks Cotten,

It wasn't my original idea, Harry!

Check out back-packer's gun cleaning kits.

....Cotten

[pisten-bully]

PS: The easiest way to pull *most* nozzles is a brake cable with the end turned down less than 3/16"

Brilliant! Thanks Cotten,

[T. Cotten]

Cotten, This float is 2.475 and it only comes out if it’s squeezed, it’s 10 years old from Greer’s (not Rubber Ducky), I’d expect a new one to be more stable and not swell for a while...

Sure, Harry!

A while anyway...

....Cotten
PS: The easiest way to pull *most* nozzles is a brake cable with the end turned down less than 3/16"

[pisten-bully]

What will keep that one from swelling, Harry?

(Was it one of my early productions?)

Blowing on the valve doesn't tell you anything; Suction does.

Please completely remove the nozzle and venturi for inspection, as crud can collect in the annular void around it.

....Cotten

Cotten, This float is 2.475 and it only comes out if it’s squeezed, it’s 10 years old from Greer’s (not Rubber Ducky), I’d expect a new one to be more stable and not swell for a while. And I sucked on the valve and it’s not letting any air past, now I’m soaking the nozzle in Kroil because it won’t push out with my finger!

[T. Cotten]

...that’s why I’ve got a fresh one coming...

What will keep that one from swelling, Harry?

(Was it one of my early productions?)

Blowing on the valve doesn't tell you anything; Suction does.

Please completely remove the nozzle and venturi for inspection, as crud can collect in the annular void around it.

....Cotten

[pisten-bully]

Thanks Cotten and Tom, seems like a while ago (when it really was only a week or two) when I first had the bowl off, I couldn’t get the float out of the bowl without squeezing it gently to clear the rim, and I don’t recall it ever going in tight like that....that’s why I’ve got a fresh one coming. The other day, and before too, with the bowl off the carb and connected to the fuel supply, it all worked correctly. Float rose with the fuel and shut off the flow, and with the bowl upside down I’ve gently blown into the bowl feed/needle seat and not been able to get any air past.

Carb’s on the bench, and even though I ran a pipe cleaner soaked in acetone up through the nozzle, it’d be a wise move to take out the plugs and clean the idle passage too!

[T. Cotten]

If you covered the bowl stem hole and observed the fill rate and level,then uncover to drain and the float drops to the bottom I doubt a hung up float is the problem...

You are leaving out the bowlstem variable, Tom!

Just the indexing of the bowl upon the body can make a difference.
(The valve is supposed to be 'under the power needle', but WLA folks pull their hair out because the linkages require the bowl to be ninety degrees to the body.)

The only way I know to be certain the float is in the sweet spot is to put the bowl on the body indexed, flip it over, and suck.
(OHVs can drive you nuts, too.)

....Cotten
PS: I often relieved side-bowl models for a wider arc of indexing clearance.

[tfburke3]

Guilty as charged! And there's also times I've intended to go for a ride and then spent time with maintenance instead, so I'm not all bad!

Setting this aside until parts show up. New float to eliminate the possibility that my swollen float is hanging up and stopping fuel flow.... I didn't observe that but once the carburetor is all together you can't see what's happening in there. And new bushings for the distributor, there's some movement there so best to get rid of it.

If you covered the bowl stem hole and observed the fill rate and level,then uncover to drain and the float drops to the bottom I doubt a hung up float is the problem.When the float hangs up,usually when you first try to get the bowl oriented right,the problem is fuel overflow.If you hung up closed on assembly which would practically be impossible it wouldnt fire at all unless it was moving from closed to slightluy open,back to close,but seems unlikely.
I would also pull the nozzle and blow out the idle passage while you got it apart,especially after seeing your filter.
Lookin forward to your success.
Tom

[T. Cotten]

... New float to eliminate the possibility that my swollen float is hanging up and stopping fuel flow.... I didn't observe that but once the carburetor is all together you can't see what's happening in there...

Just turn the carb upside down, Harry!

And suck on the valve. Even a perfect float can rub or hang up on the bowlstem if its not in the "sweet spot", especially if there is slop on the pivot.

Did you by any chance put a caliper on it? If it came out of the bowl easily, it ain't a "bloat",.. yet...

....Cotten

[pisten-bully]

its a natural thing to just go out to the barn, jump on the bike, go for a spin and tell yourself you'll do the maintenance later. Doesn't always end up that way, things come up and the "I'll do it later" card is now on the table !! I'm guilty too ! Probably way more guilty than many others.

Guilty as charged! And there's also times I've intended to go for a ride and then spent time with maintenance instead, so I'm not all bad!

Setting this aside until parts show up. New float to eliminate the possibility that my swollen float is hanging up and stopping fuel flow.... I didn't observe that but once the carburetor is all together you can't see what's happening in there. And new bushings for the distributor, there's some movement there so best to get rid of it.