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  #1  
Old 2 Weeks Ago
Lionstrike Lionstrike is offline
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Default Two simple problems that are driving me insane...

Hi folks,

I am still wrenching on this '85 Sporster XLH. It's actually rideable now... if I am o.k. with a throttle that doesn't spring return and it leaking gas the entire way to destination.

I'm sure that this is easy and a super simple fix but humor a newbie for a second will you?

The throttle does not return. I've adjusted the throttle tension but it just doesn't seem to spring back. That means I have to manually roll on the throttle... and manually roll it back. That's a real pain. Any ideas here?

The carb leaks gas. If I throw that petcock to "ON"... it goes on the floor. I've replaced the float needle, gaskets and seals and that did not fix it. Am I doing something wrong here? Is there a way to get at this without ripping that carb off and starting over? It'd be a real pain to do that every time I need some kind of minor adjustment to see if it worked.

Thanks for any help. I'll get this thing on the road eventually.
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  #2  
Old 2 Weeks Ago
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At least you know the overflow isn't stopped up.
The only way I know that gas can roll in by itself is for the float valve to not close.
It needs to be adjusted.
Which float valve are you using?
The three sided one can get sideways on you. 4 sided is a better bet.
See this page in the Sportsterpedia if it's a butterfly carb.
http://sportsterpedia.com/doku.php/t...aust_-_sub-01q

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Lionstrike Lionstrike is offline
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Default

Thanks for the response!

I was using the four sided one in the carb rebuild kit, it looks like the original was three sided. I took out the four sided one and put in the three sided one and it actually seems to work better. I cleaned off some gunk from it but it seemed like the original float and it was easier to seat. I turned on the gas at the petcock and I saw much less leaking. I didn't leave it on for too long because... well...

It is time for me to put the tools DOWN.

I know that this isn't a self help forum, but every single person in my immediate circle today is irritating me. People at work are on my last damn nerve. People I know are ticking me off. I couldn't find that darn carb bolt on the bottom (and I still don't know where it went) and I searched all over for a replacement. I eventually found one. I somehow lost it in a 10 foot radius from where I was working.

Working when I am like this is no good. I'm not focused and I am prone to do make stupid errors. A good friend of mine said, "know when to put the tools down."

For today... that time is about now.
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Default simple problems

You have Aliens in your shop.They come and steal nuts and bolts and sometimes wrenches and sockets. We all have those days when things go bad.Good to step away and regroup.
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Throttle won't return, try getting the handle bar throttle body to not rub at the end of the bar. Some push them tight but that brake them from return or opening.
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IMO It is not a good idea to work on a carb while it is installed on the bike. Toooo tedious ...





Throttle cable may be kinked or clogged with crud. Remove from bike, remove cable from sheath keeping track of direction. Use spray can solvent to clean inside sheath; lightly grease cable; re-assemble; re-install.

I use peanut butter jar lids to keep track of small parts. I have a box full of them in the shop. I use at least a dozen or more for a complete engine dismantle. I keep them lined up on the bench in dismantle sequence.

EDIT: You can see a few in the above pics
And the angle aluminum is much better than the flat steel
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I think if your carb has never had a good cleaning, it would be a good idea to pull it all apart, soak all of the metal parts overnight in a can of berryman’s chem dip and then pour boiling water over and through every hole and passage. I start every riding season by doing this to my carb.

Does your throttle have the dual cable or single? Return spring on the carb wound tight enough? You may want to lube the cable inner wires - clutch cable too for that matter. (Like mick said!!)
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Quote:
Originally Posted by IronMick View Post
IMO It is not a good idea to work on a carb while it is installed on the bike. Toooo tedious ...





Throttle cable may be kinked or clogged with crud. Remove from bike, remove cable from sheath keeping track of direction. Use spray can solvent to clean inside sheath; lightly grease cable; re-assemble; re-install.

I use peanut butter jar lids to keep track of small parts. I have a box full of them in the shop. I use at least a dozen or more for a complete engine dismantle. I keep them lined up on the bench in dismantle sequence.

EDIT: You can see a few in the above pics
And the angle aluminum is much better than the flat steel
That carb stand is a great idea for when I have a workbench and a vise again!

Sent from my Moto E (4) using Tapatalk
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"Is there a way to get at this without ripping that carb off and starting over?"

Sometimes.
After years of trying to get a Dell'Orto to work right I finally replaced it with a S&S Shorty. Life is too short for the wrong carb to annoy you.
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a Bendix has no return spring and on a bench is the easiest
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