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Fuel leaking from carb - Honda XR100
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Fuel leaking from carb - Honda XR100 - March 1, 2015, 11:09 AM

I've bought an '03 XR100 and there is fuel leaking from the carb drain. I finally tracked down where, but I'm not sure how to fix it.

I can take the bowl off the carb and pour a small amount of gas into it and watch the gas come out of the drain tube. I'm not sure if it's coming from where the brass "pipe" is seated in the bowl or if there is another manufactured outlet beneath that.

I've attached a picture. This is not my carb. Mine isn't quite that clean.



Can I take the brass tube out and clean in there?

Thanks for any advice.


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'03 Honda XR100R
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Last edited by ThrustinJZX6; March 1, 2015 at 11:27 AM..
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March 1, 2015, 12:00 PM

Sure the float just isn't adjusted high? or sticking?
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March 1, 2015, 12:43 PM

If it wasn't coming out of the drain while holding the bowl like this, I would consider another part. Fuel shouldn't drain out of the open bowl and only a table spoon of gas in it.

Everything seems smooth and stick free in the top half of the bowl.


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March 1, 2015, 01:05 PM

Yes, there is a drain to the side there, that's where the drain screw meets. I'm fairly certain that this carb has a V-nosed drain screw. It's fairly common for people to over tighten it and it ends up cracking the bowl where it meets the overfill drain tube. If that is the case, then it will have to be replaced. Part #16015-KN4-A10.


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March 1, 2015, 01:49 PM

The only thing I can guess was that the drain screw was not tightened, though it did not obviously have any problems when I picked it up from the guy. It did it when I started it later on that day. The fuel was off and as soon as I turned it on, it started flowing out.

So, that's fixed.

Now I just have to figure out why it doesn't idle smoothly. The RPM idle screw is as high as it can go and I'm just learning and figuring out how the fuel mixture screw works. Hopefully I don't have to take the carb apart again. I might also try fresh gas. The guy didn't ride it very much I think. Very low power when riding on my street.


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March 1, 2015, 01:50 PM

I'm also very family with BikeBandit and have a cart ready to go for missing pieces and replacements.


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March 1, 2015, 01:56 PM

I may also have put the throttle slide in incorrectly, if there is a proper orientation to it. I saw a slot and thought I put it in right, but that doesn't account much for the low acceleration power.

Sorry, just making notes of my thoughts.


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March 1, 2015, 02:09 PM

Your idle jet is clogged. You've got to punch it out, or get a new one.


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March 1, 2015, 04:48 PM

Which one would that be?



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March 1, 2015, 06:57 PM

Quote:
Originally Posted by ThrustinJZX6 View Post
Which one would that be?

Pilot jet, slow jet, idle jet. Many different names, depending on what microfiche you're looking at.


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March 1, 2015, 07:36 PM

Many thanks. I look forward to getting this thing running smoothly this week.


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March 5, 2015, 07:13 AM

I was able to get a very microscopic, pin point sized hole through the pilot jet, which I'm assuming is enough, but it's still not idling. It sounds like it's revving correctly though. The main jet looks really good.

I tried messing with the fuel mixture screw, but I don't think that has anything to do with it.

I did have a question about the idle screw. It just seems to be a pointed end inside the chamber and I can't tell that it's doing anything. It is all the way screwed in at this point because all the way out made it seem to shut off even worse.

I was going to try new gas today.


'00 Kawasaki Ninja ZX6-R
'03 Honda XR100R
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March 5, 2015, 09:31 AM

Quote:
Originally Posted by ThrustinJZX6 View Post
I was able to get a very microscopic, pin point sized hole through the pilot jet, which I'm assuming is enough, but it's still not idling. It sounds like it's revving correctly though. The main jet looks really good.

I tried messing with the fuel mixture screw, but I don't think that has anything to do with it.

I did have a question about the idle screw. It just seems to be a pointed end inside the chamber and I can't tell that it's doing anything. It is all the way screwed in at this point because all the way out made it seem to shut off even worse.

I was going to try new gas today.
Sounds like your shooting in the dark now, dude. Yes, the slow jet is going to have a small hole, but it needs to be absolutely clear, or the bike won't run correctly. The slow curcuit in the carb might be clogged as well.

If you bring me the carb off the bike, I'll show you how to do it all.


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March 5, 2015, 10:12 AM

Quote:
Originally Posted by superchickencornermonster View Post
Sounds like your shooting in the dark now, dude. Yes, the slow jet is going to have a small hole, but it needs to be absolutely clear, or the bike won't run correctly. The slow curcuit in the carb might be clogged as well.

If you bring me the carb off the bike, I'll show you how to do it all.
Thrustin - Run, don't walk and take this man up on his offer.

I've been digging into carbs for over 40 years. Knowing the basics of what makes a carb tick and knowing the "gotchas" is 90% of the battle.

The last 10% involves getting the perfect tune and requires black arts and chickens hung upside down. A closely guarded secret to which I'm not privvy. I settle for "It runs good". If I need better than that it goes to a pro.


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March 5, 2015, 11:05 AM

Well I'd have to drive. I live in Harrisonburg.


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