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Old 10-05-2012, 07:17 PM   #1
Yokomo OP
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1985 Honda XL350R carburetors

I've got some questions about the carbs. Does 1 of them work at all times and the 2nd one kicks in from the mid to top end? Which one works throughout the whole range? The 1 on the left per chance?
Is there a way to tell if the 2nd one is kicking in?

Is there an easy way to richen the idle so it will start easier? I did something easy on my XR250L and it made it kick to life real nice (I just don't remember what I did).

Thanks!
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Old 10-06-2012, 02:59 AM   #2
Homerb
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Thats right, the left carby operates all the time and the right carby kicks in at higher throttle openings.
You can tell by the sound of the exhaust when the second carby opens.
Not sure how to easily richen up the mixture.
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Old 10-06-2012, 03:55 AM   #3
RFVC600R
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When you get past half throttle, just like the man before me said, you can hear the engine open up and feel it. atleast so on my XL600

The air mixture screw should be on the bottom of the main (left) carb according to my manual. You shouldn't have to turn it more than 1 and a half times. The 83' XL600 has one on the side.
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Old 10-06-2012, 05:40 AM   #4
Yokomo OP
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Thank you.
Does the 2nd open in response to throttle pull or rpm? ie. Is there anything to physically see moving on the 2nd or does it open in response to rpm/then the vacuum lifts?

Yes there's the air/fuel screw on the left of the left carb. It has a tab on it that limits its movement. On my 250 I dremeled off the tab so I could turn it more and richen it up. I think I may have raised the needle using a washer as well. I remember it made it fire right up 1st kick.
Has anyone tried that?
How hard is it to remove the carbs? Do they come out as a unit or seperate?
Thanks
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Old 10-06-2012, 05:50 AM   #5
brucifer
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Quote:
Originally Posted by Yokomo View Post
Thank you.
Does the 2nd open in response to throttle pull or rpm? ie. Is there anything to physically see moving on the 2nd or does it open in response to rpm/then the vacuum lifts?

Yes there's the air/fuel screw on the left of the left carb. It has a tab on it that limits its movement. On my 250 I dremeled off the tab so I could turn it more and richen it up. I think I may have raised the needle using a washer as well. I remember it made it fire right up 1st kick.
Has anyone tried that?
How hard is it to remove the carbs? Do they come out as a unit or seperate?
Thanks
The second carb opens with linkage--so it's mechanical not vacuum.
I used a washer on my XL600 needle and, yes, it made a difference.
The carbs are kind of a PITA to remove. They come out as a unit.
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Old 10-06-2012, 05:52 AM   #6
RFVC600R
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Quote:
Originally Posted by Yokomo View Post
Thank you.
Does the 2nd open in response to throttle pull or rpm? ie. Is there anything to physically see moving on the 2nd or does it open in response to rpm/then the vacuum lifts?

Yes there's the air/fuel screw on the left of the left carb. It has a tab on it that limits its movement. On my 250 I dremeled off the tab so I could turn it more and richen it up. I think I may have raised the needle using a washer as well. I remember it made it fire right up 1st kick.
Has anyone tried that?
How hard is it to remove the carbs? Do they come out as a unit or seperate?
Thanks
The second one is operated all mechanically.

You can cut the tab, I recommend it. On my XL600R, Which according to the book is the same as the 350, they come out together. You can seperate them if you need to, but you can do most the work on them together.

Video from Drayshop on youtube.com for XL600r carb maintenance. Worth the 9 mins watching!

https://www.youtube.com/watch?v=lOCD...9&feature=plcp
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Old 10-06-2012, 05:55 AM   #7
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Damn beat me to it by two minutes
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Originally Posted by Carter Pewterschmidt View Post
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Old 10-06-2012, 06:28 AM   #8
Yokomo OP
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Nice video. But I see some differences. The fuel mix screw that is already dremeled in the vid, I don't have. Mine has a horizontal screw on the left side of the carb (which is not on the 600 carb). So I'm wondering if mine has an air screw instead of a fuel screw?

Now that I see the vid I recall my 250 had a weird way to get the needle out. I bet the 600 and 350 are the same. Something about a spring and removing a screw inside the carb? I'm thinking there's a vid on this as well? Anyone know?
Thanks for the quick responses!
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Old 10-06-2012, 05:37 PM   #9
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Anyone?
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Old 10-08-2012, 05:29 AM   #10
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Anyone?
All thread are better with pichers.

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Old 10-08-2012, 05:50 AM   #11
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Here's an exploded diagram of your carbs. Number 15 is what you're concerned with.

http://www.bikebandit.com/houseofmot...9697#sch405906

Regarding your mixture screw, in my experience if it is towards the back of the carb it's an air screw, towards the front it's fuel.
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Old 10-08-2012, 05:56 AM   #12
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Behind float bowl (towards the rear) = air screw.

In front of float bowl (towards cylinder) = fuel screw.

You should have an air screw.
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Old 10-08-2012, 05:36 PM   #13
Yokomo OP
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Quote:
Originally Posted by brucifer View Post
Here's an exploded diagram of your carbs. Number 15 is what you're concerned with.

http://www.bikebandit.com/houseofmot...9697#sch405906

Regarding your mixture screw, in my experience if it is towards the back of the carb it's an air screw, towards the front it's fuel.
Are you sure it's not #7? That looks more like the airscrew. (I could be wrong)
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Old 10-08-2012, 06:21 PM   #14
High Country Herb
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That's the nicest 350 I've seen; a classic for sure.
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Old 10-08-2012, 06:36 PM   #15
motomike14
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Anyway you can take a photo of the left side carb? I tried to look online, but couldn't tell.
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