ADVrider

Go Back   ADVrider > Bikes > Thumpers
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 03-13-2013, 03:57 PM   #7111
MAXNX
Adventurer
 
Joined: Jul 2009
Location: Sussex,WI
Oddometer: 47
Quote:
Originally Posted by Carter Pewterschmidt View Post
I will have to politely decline my friend. I have so many parts laying around here that it's becoming a nuisance. In fact I've been trying to pass some of them off to Crobox. I do appreciate the offer so if you ever need something in the future let me know. I have various odds and ends and carb parts galore.

I would however make room for a spare set of stock wheel hubs.
Can I get a hold of you if I need little things here and there? I am right down the road from you.
MAXNX is offline   Reply With Quote
Old 03-13-2013, 04:13 PM   #7112
RFVC600R
SAND EATER!
 
RFVC600R's Avatar
 
Joined: Dec 2011
Location: SAND LAND
Oddometer: 2,203
Do i need to adjust anything when I take the snorkel out? it sounds little more beefy now
__________________
'83 Honda XL600R 618cc 11:1 Wiseco, XR's Only Exhaust, big tube header, 6 Sigma stage 3 carb mods

Quote:
Originally Posted by Carter Pewterschmidt View Post
He's the XL600 Jesus, his bike dies for our sins.
RFVC600R is offline   Reply With Quote
Old 03-13-2013, 05:15 PM   #7113
m2h
"Old guys rule"
 
m2h's Avatar
 
Joined: Nov 2012
Location: Waipu New Zealand
Oddometer: 122
Quote:
Originally Posted by joexr View Post
I did this. 1/8'' or #30 drill bit.

Thanks for that. Will have a look at doing it while the motor is in bits.
M2H
m2h is offline   Reply With Quote
Old 03-13-2013, 05:19 PM   #7114
m2h
"Old guys rule"
 
m2h's Avatar
 
Joined: Nov 2012
Location: Waipu New Zealand
Oddometer: 122
Quote:
Originally Posted by mcma111 View Post
Your still limited by the hole size in the cam. The two banjo bolts have different size holes. The top one is smaller so buy another bottom one for the top. That's about all you can do.
Thanks Steve. Another option to look at.
m2h is offline   Reply With Quote
Old 03-13-2013, 05:21 PM   #7115
m2h
"Old guys rule"
 
m2h's Avatar
 
Joined: Nov 2012
Location: Waipu New Zealand
Oddometer: 122
Quote:
Originally Posted by joexr View Post
Its limited by the size of the oil line. There are 5 holes in the cam.
Yeah wondered about that too. Don't matter how big the exit is if the door in is smaller!

Thanks again
M2H
m2h is offline   Reply With Quote
Old 03-14-2013, 04:57 AM   #7116
sw3dl1
DR Don
 
Joined: Feb 2008
Location: Scottsdale, AZ
Oddometer: 509
Quote:
Originally Posted by Carter Pewterschmidt View Post
I'm always trying to buy an NOS 86 tank for my bike, so I routinly search ebay for XL tanks, but I never saw one of those before. A very cool find indeed, the "desert" decals really make it and Acerbis is a good brand. All around a hot piece of old XL bling. If it were white instead of red I might have went after it myself.

Make sure to do a little write up and take some pics of the install.
You looking for a red, white and blue 86 XL600r tank? If so, I have an 87 that is almost perfect. It was taken off when new by a friend to use an aftermarket tank. Been setting on a shelf for almost 27 years. NO RUST INSIDE. I was going to use it but I found a Red tank to go with red framed bike I'm building. I doubt I will use it. If intereted shoot me a PM and we will work out a price.
__________________
2007 BMW f650GS
1988 Honda NX650 - X2
1982 Honda GL1100 - X2
sw3dl1 is online now   Reply With Quote
Old 03-14-2013, 12:35 PM   #7117
Carter Pewterschmidt
Beastly Adventurer
 
Carter Pewterschmidt's Avatar
 
Joined: Nov 2010
Location: Milwaukee
Oddometer: 1,000
Quote:
Originally Posted by MAXNX View Post
Can I get a hold of you if I need little things here and there? I am right down the road from you.
Sure man, send me a PM whenever.
Carter Pewterschmidt is offline   Reply With Quote
Old 03-14-2013, 03:30 PM   #7118
MAXNX
Adventurer
 
Joined: Jul 2009
Location: Sussex,WI
Oddometer: 47
Quote:
Originally Posted by Carter Pewterschmidt View Post
Sure man, send me a PM whenever.
PM Sent
MAXNX is offline   Reply With Quote
Old 03-14-2013, 08:46 PM   #7119
crobox
Gnarly Adventurer
 
crobox's Avatar
 
Joined: Nov 2012
Location: Taos, NM
Oddometer: 312
Quote:
Originally Posted by davek181 View Post
I hope I answered some of your questions or cleared things up a little. If not please feel free to ask more.
So I've been thinking more about how carbs work, since your great explanation, Dave. I do have a few more questions....

Regarding the air mixture screw, this regulates the amount of air that gets mixed in with the fuel in the low/pilot jet, right? So it only applies to idle, right? And I guess the more you screw it in, the leaner the idle mix...

And second question... mostly just our of curiosity.... The bottom of the main jet sits a little lower than the bottom of the pilot jet. Are both of these actually submerged in the float bowl fuel? Or is the main jet submerged and the pilot jet just above the level of the fuel?

Just thinking about it all and trying to understand how it works...

Cheers,
Christian
__________________
Current Bikes: 2002 XR650L, Nighthawk, 1986 Honda XL600R, 1988 Hondasuki KLNX250R, 1988 BMW R100GS (dead)
Previous Bikes: Honda XL250R (2 of them), Honda XL600R, Kawasaki KLR600, BMW K1100LT, BMW R60/6, BMW K75, Husqvarna 430XC
Click HERE for my Cummins 4BT International Scout build thread www.christianristow.com

crobox screwed with this post 03-14-2013 at 08:59 PM
crobox is offline   Reply With Quote
Old 03-14-2013, 08:57 PM   #7120
crobox
Gnarly Adventurer
 
crobox's Avatar
 
Joined: Nov 2012
Location: Taos, NM
Oddometer: 312
Oh, and also....

Not long after starting to ride my XL600 around, I had the distinct feeling that
A) I want to get better at riding off-road; more confident, more skillful
B) I don't really want to do it on the XL, because it's a bit heavy and also it's so damn beautiful (which is to say that I want to ride something for a while that I don't mind dropping.)

So I started talking to various friends about it (turns out I have a lot of friends around here who ride dirt bikes), and one guy said "Hey, my wife has an NX250 she doesn't want."

I bought it for $250, did a bunch of basic work on it, realized it has a problem with one of it's valves, decided to ignore that problem, got it started, stripped a bunch of plastic parts off it, mounted my old XL600 front fender, and started riding it. And it's fun! Here it is:



I've been posting more technical questions and stuff over in the NX250 thread. I know it's a bit off-topic so I'll leave it at that.

But I gotta say it.... electric start is nice!

-Christian
__________________
Current Bikes: 2002 XR650L, Nighthawk, 1986 Honda XL600R, 1988 Hondasuki KLNX250R, 1988 BMW R100GS (dead)
Previous Bikes: Honda XL250R (2 of them), Honda XL600R, Kawasaki KLR600, BMW K1100LT, BMW R60/6, BMW K75, Husqvarna 430XC
Click HERE for my Cummins 4BT International Scout build thread www.christianristow.com
crobox is offline   Reply With Quote
Old 03-15-2013, 12:46 AM   #7121
m2h
"Old guys rule"
 
m2h's Avatar
 
Joined: Nov 2012
Location: Waipu New Zealand
Oddometer: 122
oil cooler mod

Am considering trying to add an oil cooler to my '86 while I have the motor out. Has anyone tried or heard of fitting a later model XR400 cooler? Don't really know the dimensions but read on Thumper Talk of one or two xl600 owners who have done it but gave no real description of how.
Wondering how much cooling it would provide as it don't look very big!
Read about using coolers from JC Whitney etc. but at 11" X 6" X 3/4" might be a mission to fit in.
Interesting discussion maybe?
m2h is offline   Reply With Quote
Old 03-15-2013, 01:59 AM   #7122
doc.heckle
Adventurer
 
Joined: Jan 2007
Location: UK
Oddometer: 38
Pilot jet, screw in richer out leaner, it alters the amount of air not fuel.
doc.heckle is offline   Reply With Quote
Old 03-15-2013, 03:43 AM   #7123
joexr
Beastly Adventurer
 
Joined: Jan 2011
Location: S.E.
Oddometer: 3,773
If the screw is on the cylinder side of the carb its a fuel screw . In would be leaner. If its on the airbox side its an air screw. Out would be leaner. 2strokes usually have air screws and 4strokes usually have fuel screws.
joexr is offline   Reply With Quote
Old 03-15-2013, 05:55 AM   #7124
davek181
Studly Adventurer
 
Joined: Aug 2007
Location: Idaho
Oddometer: 749
Quote:
Originally Posted by crobox View Post
So I've been thinking more about how carbs work, since your great explanation, Dave. I do have a few more questions....

Regarding the air mixture screw, this regulates the amount of air that gets mixed in with the fuel in the low/pilot jet, right? So it only applies to idle, right? And I guess the more you screw it in, the leaner the idle mix...

And second question... mostly just our of curiosity.... The bottom of the main jet sits a little lower than the bottom of the pilot jet. Are both of these actually submerged in the float bowl fuel? Or is the main jet submerged and the pilot jet just above the level of the fuel?

Just thinking about it all and trying to understand how it works...

Cheers,
Christian
Regarding the pilot jet/ slow jet, fuel mixture screw and circuit. As you can see there are several names for it but that is not unknown in the mechanical world. The mixture screw can be either an air or fuel mixture screw depending on where it is placed in the idle circuit. Usually if it is in front of the slide, down wind side or nearer the engine it is a fuel screw. if it is ahead of the slide on the air cleaner side it is an air screw. It works on the same principal as the needle jet/main jet where it limits the flow of fuel or air in the idle circuit. It is also a tapered rod that you either retract or push into a fixed orifice by screwing it in or out. Understanding that concept it is easy to see that if it is an air screw, screwing it in richens the mixture by limiting air mixed with the fuel. The opposite is true with a fuel screw obviously.

The pilot jet mainly affects idle, and is adjustable for best idle purposes. There is a little bleed over effect into the low speed range as with any circuit of the carburetor. It takes care of duties when the main circuit is closed down due to the needle for the main circuit and low venturi effect essentially shutting it if. So for a very brief period of throttle opening the slow circuit helps transition to the main circuit as the needle is pulled out of the main jet. There are other factors involved there too such as slide cutaway which is used to promote venturi action for the main circuit, and some carbs have accelerator pumps too (pumper carbs they are commonly called) for the off idle transition.

Both main and slow jets are submerged in fuel all the time, I do not know why the slow jet is shorter officially but I suspect it is to keep it above the flow of the main jet and out of potential crud in the bottom of the float bowl since it is smaller than the main jet and will plug easier. They could in theory put a slow jet in a place where it could use the main jet circuit as a source of fuel drawing though the main jet and metering the mix at idle with the mixture screw. I can see potential transition issues that way so I think they are separate for a good reason. You do see jet sharing sometimes in CV carbs where they use a rubber plug to seal the passage after you put the jet in and it draws it's fuel then through a larger jet but that is a whole different kind of carburetor.
davek181 is online now   Reply With Quote
Old 03-15-2013, 08:23 AM   #7125
crobox
Gnarly Adventurer
 
crobox's Avatar
 
Joined: Nov 2012
Location: Taos, NM
Oddometer: 312
Quote:
Originally Posted by m2h View Post
Am considering trying to add an oil cooler to my '86 while I have the motor out. Has anyone tried or heard of fitting a later model XR400 cooler? Don't really know the dimensions but read on Thumper Talk of one or two xl600 owners who have done it but gave no real description of how.
Wondering how much cooling it would provide as it don't look very big!
Read about using coolers from JC Whitney etc. but at 11" X 6" X 3/4" might be a mission to fit in.
Interesting discussion maybe?
I added an oil cooler, which was a generic aftermarket unit. There are several posts about how and where I added it starting around post #146 (page 10) in my build thread. There is also a bit of discussion about how useful it is; who could benefit from one; who maybe doesn't need one.

Hope it helps a little.

-Christian
__________________
Current Bikes: 2002 XR650L, Nighthawk, 1986 Honda XL600R, 1988 Hondasuki KLNX250R, 1988 BMW R100GS (dead)
Previous Bikes: Honda XL250R (2 of them), Honda XL600R, Kawasaki KLR600, BMW K1100LT, BMW R60/6, BMW K75, Husqvarna 430XC
Click HERE for my Cummins 4BT International Scout build thread www.christianristow.com
crobox is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


Times are GMT -7.   It's 04:15 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014