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Old 10-26-2012, 09:45 AM   #1 (permalink)
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Question Slow Jet Hole Size?

Hello out there from SW Tennessee

My bike ('93 Heritage Soft Tail (FLSTC)) has been sitting for a few years.
The fuel was NOT drained from the carb before it was put up
Although I've cleaned (and cleaned and cleaned) the carb - The engine will NOT idle without a fair helping of the enrichment circuit.

The Slow Jet (#40) seems to have a VERY small hole in it - at least it seems really small to me.
I think it's still plugged up, but I just don't know.
It should be about .0158 but I don't think it is.
Looking a the gap on a mic set at .015748 it looks way larger than the outlet hole in the jet....

Can someone please post a picture of a slow speed jet taken from either end looking through one?
I've searched the net and gone through all 36 pages of this sub forum but haven't found anything that I can reference to.

Thanks & Ride Free -
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Old 10-26-2012, 09:54 AM   #2 (permalink)
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You should have at least a #45 slow jet in there. If you've got pipes and a high flow air cleaner you can go to a #48 jet.
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Old 10-26-2012, 12:00 PM   #3 (permalink)
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Agreed. Perhaps the "40" is really a "48" and just difficult to read. Even at that, you should be able to hold it up and see light through it.
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Old 10-26-2012, 12:22 PM   #4 (permalink)
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Agreed. Perhaps the "40" is really a "48" and just difficult to read. Even at that, you should be able to hold it up and see light through it.
Thanks for the reply.
Could be I read it wrong - Carb's on the bike and it's raining. I HAVE to do gas stuff outside, so I can't get it off right now.
I bought it in 93 with 200 miles on it (the guy said it vibrated too much ). It always ran GREAT until I let it sit. Arrrrrg!

I suspect that the jet is in fact clogged and the spray carb cleaner just didn't do it.... Like I said - I can see through it, but only with great difficulty because the hole is so small. So now I'm even more concerned about the passages that I cant see in.

I'll try taking it apart again and use Sea Foam as the cleaner if it ever stops raining. Weather man says maybe tomorrow, but surely clear on Sunday.
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Old 10-26-2012, 02:43 PM   #5 (permalink)
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Just replace it. The efforts and time will be less. Get a 45 that's always been enough for the 80 Evo's I've done. 42 is stock.
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Old 10-26-2012, 02:55 PM   #6 (permalink)
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Just replace it. The efforts and time will be less. Get a 45 that's always been enough for the 80 Evo's I've done. 42 is stock.
Well over an hour drive to a dealer....
IF I can't fix it I'll either hit the road or order one - But I way prefer to fix what I have --- If you know what I mean
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Old 10-26-2012, 06:37 PM   #7 (permalink)
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Well over an hour drive to a dealer....
IF I can't fix it I'll either hit the road or order one - But I way prefer to fix what I have --- If you know what I mean
Blow it out with compressed air

If it is still clogged then then you are sol in my opinion

Or, let it soak in Carb cleaner then do that
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Old 10-26-2012, 06:48 PM   #8 (permalink)
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Well...It is a brass jet. bored to the size appropriate for the application. IF you can't rid the clog, then may be possible there is damage beyond repair (i doubt it based on your reporting).
I would bet that you may have smootz in the lines as well and every time you clean the jets you get new smootz when gravity does it's magic.
Replace the fuel line too. They can breakdown from the inside.
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Old 10-26-2012, 08:42 PM   #9 (permalink)
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Originally Posted by misinlink View Post
Well...It is a brass jet. bored to the size appropriate for the application. IF you can't rid the clog, then may be possible there is damage beyond repair (i doubt it based on your reporting).
I would bet that you may have smootz in the lines as well and every time you clean the jets you get new smootz when gravity does it's magic.
Replace the fuel line too. They can breakdown from the inside.
That is superb advice -
Something that I hadn't thought of....
Thanks

I think (OK, Hope) that the passages are open - Carb cleaner and air zip right on through the little holes but the motor won't idle without enrichment. I thought that maybe the working part of the jet might be ceramic, so I didn't scrape it with anything.
But since it's just a bored out piece of brass I'll attack it with plastic picks and see what shakes loose -- Hopefully tomorrow.

THANKS again for the help.

P.S. I finally found a pic of a jet from the top - on another forum. Mine is definitely plugged up.
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Old 11-03-2012, 02:53 PM   #10 (permalink)
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Quote:
Originally Posted by misinlink View Post
Well...It is a brass jet. bored to the size appropriate for the application. IF you can't rid the clog, then may be possible there is damage beyond repair (i doubt it based on your reporting).
I would bet that you may have smootz in the lines as well and every time you clean the jets you get new smootz when gravity does it's magic.
Replace the fuel line too. They can breakdown from the inside.
That is thee info that I needed.
I took a steel push-pin and cleaned out the hole in the jet.
Put SeaFoam into the slow air jet inlet and followed it with compressed air a couple of times.
Put on all new fuel lines, cleaned the fuel filter, and put it back together.

My old EVO is purring like a panther again

Thanks!
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