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Old 03-23-2009, 07:32 PM   #1
lamoson OP
something catchier
 
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Joined: Mar 2008
Location: Wiscompton
Oddometer: 680
1980 Honda XL 80 resurrection

so i picked up a freebie today

a 1980 Honda XL 80


the thing was beat. laying on its side for who knows how long, hasn't run in years. throttle wont twist and hardly makes a sputter when kicked or popped. so a buddy of mine and I put it on the truck and took it home, hillbilly style.






needs to be worked on, and it's a little chilly out so what the heck, i will just move it on inside


















inside the gas tank-very nice




once i got it inside, time to tear it down.
took of the seat, skid, cover plate, air filter, carb, tank i think that is it.




skid plate was just NASTY






just a little dirty




found this little guy in the air filter


pulled the carb off here is the needle, messed about with it and got the throttle turning.


the carb




made in...


the work station


parts that came off--minus the gas tank, decided to take that one outside as to not upset the wife. i mean she is rad enough to be cool with this so yeah a little courtesy goes a long way.


and me



so i think thats as far as im going to go with the strip down, don't think i will change the oil yet. it does have spark, so i am going to clean out the carb and clean it up a bit and give it a whirl.

will keep ya posted on it.

jamo
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Old 03-23-2009, 07:46 PM   #2
bgoodsoil
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man that slide is tiny!

I've been surprised by some old beaters that just plain wanted to run. They were waiting for the right person to come along and let 'em.
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Old 03-23-2009, 08:42 PM   #3
Kismet
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I love it.


It's a sickness.
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Old 03-23-2009, 09:02 PM   #4
G2mk3
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looks fairly similar to the 82' xl185 project i'm beginning
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Old 03-24-2009, 04:57 AM   #5
dbarale
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Location: Western NC
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Quote:
Originally Posted by lamoson
...so i think thats as far as im going to go with the strip down, don't think i will change the oil yet. it does have spark, so i am going to clean out the carb and clean it up a bit and give it a whirl...
Great project! I really like the white, slightly oversized, plastics on it.
I would go ahead and replace the oil with the cheapest stuff you can find, you do not know how much crud, gas or water is in there right now. You may also find chunks of metal big enough in the oil that will tell you that the project is not worth it.
Good luck!
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Old 03-24-2009, 06:00 AM   #6
DoubleBit
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Old honda singles,,, sweet.
First, check out the honda xl thread in this forum.
Second, about cheap oil,, Ja, that'll work, but atf has more cleaners in it and is safe to run for a limited time and works great for freeing things up internally.
Third, (and you're already doing it) have fun with the lill' beast!
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Old 03-24-2009, 06:37 AM   #7
lamoson OP
something catchier
 
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Oddometer: 680
Quote:
Originally Posted by DoubleBit
Old honda singles,,, sweet.
First, check out the honda xl thread in this forum.
Second, about cheap oil,, Ja, that'll work, but atf has more cleaners in it and is safe to run for a limited time and works great for freeing things up internally.
Third, (and you're already doing it) have fun with the lill' beast!
so i should swap the oil with transmission fluid for a bit? really? and how long would a limited time be?
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Old 03-25-2009, 03:01 PM   #8
lamoson OP
something catchier
 
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ok so i got it started today, but i can't get it to idle. it starts up and then runs for about 30 seconds and quits, even with me trying to keep it alive with the throttle. with the choke in the down position, which opens up the valve, the idle goes CRAZY high, like the bike might blow up. and then if i put it in gear on the high idle. it sputters and dies.

anybody know what the two screws need to be set at. can't get it right. i did get it up and down the street once though, but barely and at about 10 mph max.

thanks for any help
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Old 03-25-2009, 04:07 PM   #9
dbarale
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First, what did you do. Did you clean up the carb internally? Did you clean up the tank? Petcock? Are you running fresh gas? Did you make sure that the slide moves freely when you release the throttle?
How is the idle screw (assuming there is one, I do not know these carbs) adjusted? What about the mixture screw?
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Old 03-25-2009, 06:33 PM   #10
lamoson OP
something catchier
 
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Location: Wiscompton
Oddometer: 680
Quote:
Originally Posted by dbarale
First, what did you do. Did you clean up the carb internally? Did you clean up the tank? Petcock? Are you running fresh gas? Did you make sure that the slide moves freely when you release the throttle?
How is the idle screw (assuming there is one, I do not know these carbs) adjusted? What about the mixture screw?
I couldn't crack the carb, because one of the two screws is stripped. I did clean out the tank, there is fresh gas, with carb cleaner additive in it. i believe the slide moves freely. i also sprayed some carb cleaner in the carb.

as far as the screws go. i have no idea which are what. here is a pic of the carb. there are two screws on the side, and one on the bottom. the big one on the side will back all the way out, but the smaller one stops. the bottom one also backs all the way out, but i think that is just to drain the bowl.

the big screw goes in the empty hole.


here is the big screw.


can anybody help me out with settings on these, i have tried a bunch of stuff but still wont hold idle.

also is there anything that i could do with the slide, or the throttle cable there is also an adjustment that can be made on that

its the little hex metal piece on the top of the cap


thanks for any tips

jamo
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81' Cafe project http://www.advrider.com/forums/showthread.php?t=519776

80' XL80 http://www.advrider.com/forums/showt...highlight=XL80
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Old 03-25-2009, 07:08 PM   #11
p3ga
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For the throttle cable, any adjustment is going to have to be at the housing end, probably just need to adjust the freeplay.

For the carb, the smaller screw should adjust the air / fuel mix. Start by turning it in all the way, then back it out between 1 - 1 1/2 turns to start.

The large screw adjusts the idle speed. Screw it in and it raises the slide (that barrel-looking thing that fits into the top of the carb with the needle).

You want to adjust the smaller screw until the bike just runs, then turn the large screw in to where it settles into a nice even idle.

As this thing was neglected for so long, you're probably going to chase air leaks between the airbox and the carb & the carb and the head trying to get the beast to run right. Assuming the lead ban hasn't made XR parts unobtainable, you might want to price these rubber parts out and install them with a new air filter before you invest too many hours.

Hopefully the bolts to the head and intake can be removed, you'll probably need to squirt a good penetrating fluid on them and go on vacation for a few days.

Hope this helps.
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Old 03-25-2009, 07:11 PM   #12
gvthnks
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The large one you have out is the idle speed adjustment screw. Screw it in enough to make it idle.

The other smaller one is the idle mixture screw. Screw it in all the way and then back it out about 2 turns. That should be a good start.

These bikes are good for vacuum leaks around the intake manifold where the carb attaches to the intake. IIRC there should be an O-ring there and if it is leaking there, (vacuum) it will idle high and be hard to adjust the carb no matter what you do.

Additionally if you haven't cleaned the carb out, especially the idle circuit, you'll play the dickens making it run right.

I can't help but smile though at the thought of resurrecting another one though. Good luck
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Old 03-25-2009, 07:14 PM   #13
lamoson OP
something catchier
 
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Joined: Mar 2008
Location: Wiscompton
Oddometer: 680
Quote:
Originally Posted by p3ga
Hopefully the bolts to the head and intake can be removed, you'll probably need to squirt a good penetrating fluid on them and go on vacation for a few days.

Hope this helps.
the carb came right off the head just fine. i have been running it without the airbox connection on. i just didn't want to put it on yet if i don't need it. i am running it just as the pictures show. the open end of the carb is not attatched to anything. is that bad? could that be my problem?
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Old 03-25-2009, 07:16 PM   #14
lamoson OP
something catchier
 
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Joined: Mar 2008
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Quote:
Originally Posted by gvthnks

These bikes are good for vacuum leaks around the intake manifold where the carb attaches to the intake. IIRC there should be an O-ring there and if it is leaking there, (vacuum) it will idle high and be hard to adjust the carb no matter what you do.
well i guess that answers my question. doh. i feel stupid. i will put the box on and give it a whirl. i had wondered if a vacuum might be needed. thanks
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2005 KTM 250sx......love it!!!!!!

81' Cafe project http://www.advrider.com/forums/showthread.php?t=519776

80' XL80 http://www.advrider.com/forums/showt...highlight=XL80
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Old 03-25-2009, 07:38 PM   #15
gvthnks
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Running it without the airbox attached won't really cause the adverse effects you're describing. It just isn't wise to run it much that way as there is nothing to filter the air and the motor can injest sand or other debris that will harm the motor.

The forward end of the carb, the side that hooks to the engine is the intake side and there should be an oring between it and the intake manifold.
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