[M00kiE]

I’ve done everything I can think of. Took the carb apart and cleaned/rebuilt it. Changed plugs. Adjusted throttle cables and idle screw - even with it all the way in, the bike won’t idle.

There is a backfire of sorts (more of a puffing than a backfire) intermittently spitting from the carb. I’ve uploaded a video to YouTube. Any ideas or suggestions of what I can look for or what it could be?

https://youtu.be/jBlTM2sORCk

Thanks for any input you guys may have

 

[M00kiE]

Going to go one by one here:

Did not replace the intake manifold gaskets but they did not look worn. Replaced all other gaskets on the carb.

It sounds like it runs out of fuel to me too. But it will stay running with the slightest turn of the throttle. Not sure what you mean by low float level but this brings up an interesting point that I had forgotten about. When I was putting the carb back together, the eyelet that is cast into the carb broke off. (Where the pin that holds the float in place goes into.). I ended up welding the pin back into place and the float seemed to operate normally, I.e. it would rotate about the pin with ease. Could this be the issue?

Not sure there’s dirt in the carb anymore as I cleaned the ever living hell out of it. Don’t think it’s valve timing as it was running fine until it sat for almost a year. These problems only recently manifested after I tried getting it going again. I’m leaning toward a mix issue which leads to the question: any recommendations on how to adjust the mixture? I followed the nightrider.com instructions but I seem to have caused myself more issues.

Will check the vent line again. Had that and the Petcock off when I took apart the carb so i’ll Check the connections again.

Really trying to avoid taking it to HD but might just have to bite the bullet. Was also thinking maybe just buy a new carb but don’t want to spend the dough if it could possibly be a motor issue. Thanks for the feedback fellas

 

[M00kiE]

So I just went out there to try the propane and it seemed to be idling fine. The idle was pretty high because I had adjusted the idle screw all the way in in an attempt to get it to idle the other day. So I backed it back out to a reasonable idle and it idled fine until it poofed out of the carb (see my YouTube vid starting at :18 seconds). Once it poofed, the idle immediately died. It seems to me this poofing, whatever it is, is the root of the idle issue. It was readily apparent when riding around as you could hear it and it felt like a sudden loss of power before kicking back in. This issue is what caused me to pull the carb to begin with.

The bike was running fine before it sat for about a year. When I pulled the carb there was a coat of oil on the filter plate and the plugs were pretty oily too when I changed them out.

Could the broken float pedestal be the cause of the poofing? I highly doubt it because it was doing it before I pulled the carb apart and broke the damn thing..

 

[M00kiE]

So I did the hand trick and it seems to have cured the poofing at idle. I let it sit idling for a few minutes and it never poofed or died. So the idling issue “seems” to have been resolved (for now). However, I took it for a spin and you can definitely hear and feel the poofing when riding. It seems to be most prominent during slow speed with a slight throttle. It pops and poofs like crazy. But if I give it more gas, it goes away. Only seems to be at very partial throttle.

I’m extremely tempted at this point just to get a new carb but it would suck to spend $500 bucks and still have the same issues

 

[M00kiE]

Toss the carb,,, a broken float pin pillar junks the carb...
A 42 low speed jet with the a/f mix screw out about 3 turns usually runs well,, then set the idle..

Really? Even with the pin welded back in place? It seems fuel delivery isn’t an issue. That sputter that occurs seems to spit out a fine mist of fuel from the carb.

 

[M00kiE]

Toss the carb,,, a broken float pin pillar junks the carb...
A 42 low speed jet with the a/f mix screw out about 3 turns usually runs well,, then set the idle..

Really? Even with the pin welded back in place? It doesn’t seem to be a fuel delivery issue to me. That sputter seems to spit out a fine mist of fuel when it happens.

 

[M00kiE]

Yes... the carb body is now a paper weight...
the pin boss,, is directional.. I think you stsrted or finished from the wrong side and broke it. then you priced the obsolete carb,,, and got sticker shock. 27421-99C,, at nearly $400.. and decided to weld cast zinc..
And here we are...

No sticker shock here.. just wanted to be sure I wasn’t throwing $500 bucks at something that wasn’t going to fix the issue. S&S ordered - hopefully that resolves the problems. Thanks for everyone’s input and help on this. I’ll update when I get the new carb put on.

 

[M00kiE]

My old evo acted like that when the hall unit was failing.

hall unit?