XS650.com
Forum Search: Advanced

Go Back   XS650 Forum > General Discussion > The Garage
Register Forum FAQ XS650 Tech Members List Search Today's Posts Mark Forums Read Donate

Welcome to XS650.com!
XS650.com is dedicated to the Yamaha XS650 twin motorcycles and to the people who love to ride, restore, and customize them. As a guest you can view the forum and photo galleries full of xs650 choppers, bobbers, trackers, cafe racers, and restorations, but you have to register before you can post or view attachments. Itís free and only takes a minute. Proceed to registration. (This notice will go away once you log in)

The Garage Motorcycle Related Discussion (Yamaha XS650, other makes and models, and anything else motorcycle related including tools and gear)

Reply
 
Thread Tools Search this Thread
Old 10-30-2011, 01:29 AM   #1
ogrilp400
XS650 New Member
 
ogrilp400's Avatar
 
Join Date: Oct 2011
Posts: 4
Default Splash Fed Big End Bearings

I have just been informed that XS 650s' have splash fed big end bearings. Is this correct? I thought splash fed big ends went out with 1940s stationary engines.
ogrilp400 is offline   Reply With Quote
Old 10-30-2011, 07:00 AM   #2
gggGary
Old guy, NO expert.
 
gggGary's Avatar
 
Join Date: Mar 2010
Location: Baraboo, WI, USA
Posts: 9,971
Default Re: Splash Fed Big End Bearings

The engine has ball big end bearings and contains oil passages and ports to ensure needed oil keeps the bearings lubricated. Ball and roller bearings do not need a high pressure oil film to live like babbit type bearings do. Bearing failure in XS650s tends to be related to disuse allowing rust to form rather than wear during use. With reasonable oil changes the bottom end often goes 60,000 miles or more between overhauls.
The manual shows a lubrication schematic and I swear i have seen engine oil distribution art also but can't place my finger on it. So... who was the expert who "informed" you that it's splash?


If loud pipes save lives...
Think what proper riding gear and training could do!
gggGary is offline   Reply With Quote
Old 10-30-2011, 03:32 PM   #3
ogrilp400
XS650 New Member
 
ogrilp400's Avatar
 
Join Date: Oct 2011
Posts: 4
Default Re: Splash Fed Big End Bearings

I was discussing oils, pumps and bearings on another bike forum and a bloke there said "XS 650 big ends survive on a splash feed oil system" I find this hard to believe. I have had very very little to do with Japanese bikes but do believe that they would have a gear pump pumping oil into the crank shaft.
ogrilp400 is offline   Reply With Quote
Old 10-30-2011, 03:36 PM   #4
ogrilp400
XS650 New Member
 
ogrilp400's Avatar
 
Join Date: Oct 2011
Posts: 4
Default Re: Splash Fed Big End Bearings

Yes I know that rolling element bearings only require a light stream of oil, drips even, as against plain bearings needing a good flow and pressure. Do XS 650s' have ball or roller BE bearings?
ogrilp400 is offline   Reply With Quote
Old 10-30-2011, 04:15 PM   #5
Purplezinger
XS650 Addict
 
Purplezinger's Avatar
 
Join Date: Feb 2011
Location: Central KY
Posts: 428
Default Re: Splash Fed Big End Bearings

Quote:
Originally Posted by ogrilp400 View Post
I have just been informed that XS 650s' have splash fed big end bearings. Is this correct? I thought splash fed big ends went out with 1940s stationary engines.
The connecting rod, big end bearings are splash lubed.


Last edited by Purplezinger; 10-30-2011 at 06:33 PM.
Purplezinger is offline   Reply With Quote
Old 10-30-2011, 04:18 PM   #6
ogrilp400
XS650 New Member
 
ogrilp400's Avatar
 
Join Date: Oct 2011
Posts: 4
Default Re: Splash Fed Big End Bearings

Thanks Purplezinger, I found it hard to believe too.
ogrilp400 is offline   Reply With Quote
Old 10-30-2011, 04:27 PM   #7
Purplezinger
XS650 Addict
 
Purplezinger's Avatar
 
Join Date: Feb 2011
Location: Central KY
Posts: 428
Default Re: Splash Fed Big End Bearings

A side note, Chevy straight 6's had low pressure oiling with splash paddles (on the connecting rods) until (I believe) 1953. I think starting in 1954 Chevy had high pressure oiling.
Purplezinger is offline   Reply With Quote
Old 10-30-2011, 04:47 PM   #8
jayel
#9 Guru 74 TX650A
 
jayel's Avatar
 
Join Date: Jan 2010
Location: southeastern Iowa
Posts: 1,925
Default Re: Splash Fed Big End Bearings

Quote:
Originally Posted by ogrilp400 View Post
Yes I know that rolling element bearings only require a light stream of oil, drips even, as against plain bearings needing a good flow and pressure. Do XS 650s' have ball or roller BE bearings?
ball bearings
Attached Thumbnails
P1120017.PNG  


I actually read this post and now my comment makes absolutely no sense.
Where are we going and why are we in this handbasket.
Hobbies... Avoiding hard work and pain
1987 XLH1100, 1980 XS1100, 1978 SR500, 1980 Yammahopper, 1966 Aermacchi/H-D M-50
jayel is offline   Reply With Quote
Old 10-30-2011, 05:55 PM   #9
aldo5468
Redleg
 
aldo5468's Avatar
 
Join Date: Feb 2010
Location: Oakland Township MI
Posts: 430
Default Re: Splash Fed Big End Bearings

This one?
Attached Thumbnails
xsengine%20oil%20flow.jpg  


'82 Heritage Special, XS750 tank, BS34's w/XSJohn's needles, 140 mains, Uni filters, Heiden oil filter, Boyer Brandsen ignition, HHB Speedster pipes, TX750 swing arm & bronze bushings, 17T/34T sprockets, Tkat fork brace, Std handlebar, frt & rr running lights, 18" rr & 21" frt wheels, SR500 tach, VDO voltmeter, Brembo 4-pot, XS1100 disc, Racetech rotor, Minton mod's, Progressive gas shocks, OSS triple clamp and midset
aldo5468 is offline   Reply With Quote
Old 10-30-2011, 06:07 PM   #10
XSLeo
XS650 Guru
 
XSLeo's Avatar
 
Join Date: Jan 2010
Location: Lebanon NY
Posts: 10,317
Default Re: Splash Fed Big End Bearings

The oil gallery across the front of the engine that feeds the oil supply line to the head has ports on the inside of the case that squirt oil on the rod big ends. If you look in Jayel's pic you will see them. Just above the dark line thar shows the oil, just in line with the rods.
The the alternator side and the two center crank bearings get oil pumped to them. The clutch side bearing runs in oil. The oil level is high enough so the crank runs in oil too. This splashes oil up on the botom of the pistons as well as the rods. This helps cool the pistons
The crank being built up out of several parts can not carry oil to the rod big ends.
Leo


The only way you can find out if you can do something is to try.
75 XS650B with a few mods, Dual disc brakes up front, Disc on rear, Pamcopete Ignition with the green coil, Radio Shack rectifier and Chrysler regulator, LED tail/brake and turnsignals. 750 kit,1.5 headepipes, Emgo shorty mufflers.
XSLeo is offline   Reply With Quote
Old 10-30-2011, 06:32 PM   #11
Purplezinger
XS650 Addict
 
Purplezinger's Avatar
 
Join Date: Feb 2011
Location: Central KY
Posts: 428
Default Re: Splash Fed Big End Bearings

Quote:
Originally Posted by ogrilp400 View Post
Thanks Purplezinger, I found it hard to believe too.
Opps! my bad, the crank is pressed together. no oil passages. I knew that, The big ends have to be splash lubed
Purplezinger is offline   Reply With Quote
Old 10-30-2011, 06:53 PM   #12
gggGary
Old guy, NO expert.
 
gggGary's Avatar
 
Join Date: Mar 2010
Location: Baraboo, WI, USA
Posts: 9,971
Default Re: Splash Fed Big End Bearings

Jayal and Aldo; yeah, both of those drawings.


If loud pipes save lives...
Think what proper riding gear and training could do!
gggGary is offline   Reply With Quote
Reply


Similar Threads (based on keywords)
Thread Thread Starter Forum Replies Last Post
Where do I put the cam bearings? Hardfahrer The Garage 10 03-03-2012 08:24 AM
bearings? malc The Garage 4 10-02-2011 01:42 PM
Cam bearings destructo The Garage 2 09-18-2010 10:41 PM
Wheel Bearings Lanesplitter The Garage 1 06-07-2010 11:53 AM
Bearings or Bushes wurlzy The Garage 4 05-18-2010 10:27 AM

Bookmarks
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off



All times are GMT -6. The time now is 03:27 AM.