The Sportster and Buell Motorcycle Forum - The XLFORUM®
 

Go Back   The Sportster and Buell Motorcycle Forum - The XLFORUM® > SPORTSTER MOTORCYCLE FORUM > Sportster Motorcycle Motor / Engine > Sportster Motorcycle Motor - Top End
XLF Blogs XLF Arcade XLF Disclaimer/Privacy Statement/Terms Of Use

Sportster Motorcycle Motor - Top End Discuss Sportster Motorcycle Top End issues. Rockerboxes, Valves, Cylinders, Pistons, Rings, Lift Rods, etc...

Active Threads
0 1969 XLCH Pics
Last Post: Captain Johnny
Posted On: 1 Minute Ago
Replies: 4
Views: 5
0 Stock mirrors. Can you see behind you?
Last Post: ZCarFan
Posted On: 3 Minutes Ago
Replies: 552
Views: 108,168
0 A Day in the Life...
Last Post: ParrotHead
Posted On: 4 Minutes Ago
Replies: 656
Views: 74,953
0 What brand synthetic oil do you use
Last Post: ParrotHead
Posted On: 6 Minutes Ago
Replies: 434
Views: 106,264
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Stairman
Posted On: 14 Minutes Ago
Replies: 44,701
Views: 7,025,940
0 Posting pics
Last Post: Toejam503
Posted On: 14 Minutes Ago
Replies: 5
Views: 102
0 2020 Bikes listed on the HD website
Last Post: ParrotHead
Posted On: 15 Minutes Ago
Replies: 16
Views: 209
0 Roads I'd like to ride.
Last Post: Stairman
Posted On: 20 Minutes Ago
Replies: 2,192
Views: 182,515
0 What have I done wrong? (Cleaned Carb, Now Won't Start)
Last Post: Hippysmack
Posted On: 23 Minutes Ago
Replies: 17
Views: 308
0 ***DK Custom-Performance Rear Shocks-Twin Adjustable Bitubos***
Last Post: DK Custom
Posted On: 39 Minutes Ago
Replies: 10
Views: 1,190
0 Hard Struts /Weak Shocks & Torn Wires
Last Post: Maxeffort
Posted On: 56 Minutes Ago
Replies: 4
Views: 95
0 Two small bearings (balls) in drain plug
Last Post: mikam123
Posted On: 56 Minutes Ago
Replies: 17
Views: 670
0 ***DK Custom Products Outlaw Permanent HiFlow Reusable Oil Filter***
Last Post: DK Custom
Posted On: 58 Minutes Ago
Replies: 22
Views: 4,553
0 Looking back
Last Post: Crash7557
Posted On: 1 Hour Ago
Replies: 0
Views: 7
0 XLCH Sticker on front fork clamp cover
Last Post: 72HOGXLCH
Posted On: 1 Hour Ago
Replies: 3
Views: 54
0 This week on Craig's list
Last Post: ryder rick
Posted On: 1 Hour Ago
Replies: 4,221
Views: 490,754
0 82 Ironhead producing power but won't charge battery.
Last Post: eheijst
Posted On: 1 Hour Ago
Replies: 2
Views: 35
0 Do you use premium gas in your Sportster?
Last Post: Toejam503
Posted On: 2 Hours Ago
Replies: 1,785
Views: 364,390
0 Hottie of the day, no nudity.
Last Post: Stairman
Posted On: 2 Hours Ago
Replies: 13,026
Views: 1,188,918
0 oil filter choices
Last Post: Tucsonmax1
Posted On: 2 Hours Ago
Replies: 31
Views: 670
0 For all the 79 owners
Last Post: ryder rick
Posted On: 2 Hours Ago
Replies: 8
Views: 188
0 ....1
Last Post: Graywolf
Posted On: 3 Hours Ago
Replies: 4,959
Views: 291,732
0 What song do you have stuck in your head?
Last Post: Hippysmack
Posted On: 3 Hours Ago
Replies: 2,254
Views: 204,323
5 Sportster ignition 2006
Last Post: olddudeone
Posted On: 3 Hours Ago
Replies: 0
Views: 34
0 Crusty's Travels
Last Post: sportsterpaul
Posted On: 3 Hours Ago
Replies: 2,345
Views: 297,868
0 33mm Front Fork Service-Disassembly
Last Post: Bluto
Posted On: 4 Hours Ago
Replies: 4
Views: 3,046
0 one sporty and $5000... What would you do?
Last Post: Folkie
Posted On: 4 Hours Ago
Replies: 309
Views: 141,530
0 Ironhead Starter Solenoid
Last Post: XLoSaurus
Posted On: 4 Hours Ago
Replies: 2
Views: 61
0 Starter under load
Last Post: ryder rick
Posted On: 4 Hours Ago
Replies: 14
Views: 427
0 Analysis results on my run of Rotella T
Last Post: shanneba
Posted On: 4 Hours Ago
Replies: 94
Views: 28,511
More...
Members Birthdays
Tags
oil leak, valve, valve guide, valve seal, valve stem

Sponsored Links
Reply
 
Share Thread Tools Display Modes
  #1  
Old 7th May 2019
T_worth T_worth is offline
Biker
 
Join Date: Jun 2018
Posts: 92
Sportster/Buell Model: Xlh 1200
Sportster/Buell Year: 96
Reputation: 1226
T_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura about
Default performance valve stems and springs

So I did a top end rebuild over the winter on my 96 sporty 1200. New exhaust valve seal went bad on rear cyc, installed a new one, 1 month later, the valve seal went bad again. I am pretty sure its the valve seal thats leaking because the exhaust port is coated in tacky black residue along with the valve guide.

I am entertaining the idea that perhaps the valve stem is wearing the seals. They didn't seem to have any burrs. I did not replace them when i did the rebuild, I only relapped them. Now I think I need to replace the valves.

During the rebuild, I discovered that I have performance parts (S&S adjustable pushrods, maybe S&S cams, and triple springs, triple spring kit for a 96? Weird). I don't know the brand or size of the valves, so buying a new set is difficult.

Would like to buy the valves and have them ready to install before I tear into the engine. Is that possible? Tempted to replace the whole spring kit, valves, and pushrods to OEM just to make it simple.
Reply With Quote
  #2  
Old 7th May 2019
seajay's Avatar
seajay seajay is offline
XL FORUM TEAM MEMBER
 
Join Date: Nov 2004
Location: jupiter fl
Posts: 2,609
Sportster/Buell Model: 1200C
Sportster/Buell Year: 04
Reputation: 656024
seajay has a reputation beyond reputeseajay has a reputation beyond reputeseajay has a reputation beyond reputeseajay has a reputation beyond reputeseajay has a reputation beyond reputeseajay has a reputation beyond reputeseajay has a reputation beyond reputeseajay has a reputation beyond reputeseajay has a reputation beyond reputeseajay has a reputation beyond reputeseajay has a reputation beyond repute
Default

You should find out what cams are in there.
__________________
04/07 1275 BFH heads .590 cams S&S 1.725 rockers S&S premium lifters BDL+15% clutch TC88A HSR-45 S&S 3" ac LSR 2-1
Reply With Quote
  #3  
Old 9th May 2019
bustert's Avatar
bustert bustert is offline
XL FORUM TEAM MEMBER
 
Join Date: Jul 2008
Posts: 9,452
Sportster/Buell Model: 1200s
Sportster/Buell Year: 2001
Sportster/Buell Model #2: xlch
Sportster/Buell Year #2: 1974
Reputation: 2620664
bustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond repute
Default

perhaps the seals are not concentric to the guides, cannot do anything but fail.
correct seals? the seals are designed to leak.
Reply With Quote
  #4  
Old 9th May 2019
T_worth T_worth is offline
Biker
 
Join Date: Jun 2018
Posts: 92
Sportster/Buell Model: Xlh 1200
Sportster/Buell Year: 96
Reputation: 1226
T_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura about
Default

Quote:
Originally Posted by bustert View Post
perhaps the seals are not concentric to the guides, cannot do anything but fail.
correct seals? the seals are designed to leak.
I don't think the seals are designed to leak. They should hold back the oil in the rocker box from getting into combustion. Had a come to jesus moment....If I don't know what brand/size the valve spring kit or valves are, then the valve seals that come in the sportster cometic gasket kit might be incorrect. The valve seals I used are in the Cometic kit #C9763
Reply With Quote
  #5  
Old 9th May 2019
bustert's Avatar
bustert bustert is offline
XL FORUM TEAM MEMBER
 
Join Date: Jul 2008
Posts: 9,452
Sportster/Buell Model: 1200s
Sportster/Buell Year: 2001
Sportster/Buell Model #2: xlch
Sportster/Buell Year #2: 1974
Reputation: 2620664
bustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond repute
Default

if you research the stem seals, they must leak or the assy will fail. they use the sliding action of the stem to act as small pumps. the guide cannot get lube from any other source.
just a quikie
https://www.felpro.com/technical/tec...tem-seals.html
Reply With Quote
  #6  
Old 9th May 2019
aswracing's Avatar
aswracing aswracing is offline
A Million Facts & Figures
 
Join Date: Jan 2005
Location: Famous Potatoes
Posts: 10,038
Sportster/Buell Model: XL883
Sportster/Buell Year: 2007
Sportster/Buell Model #2: Buell Cyclone
Sportster/Buell Year #2: 1999
Reputation: 2644471
aswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond repute
Default

Quote:
Originally Posted by T_worth View Post
The valve seals I used are in the Cometic kit #C9763
Those seals (sold under a thousand different brand names) will leak if they're driven on too far. The top of the guide starts interfering with the seal material.

The other possibility here is the valve fit in the guide being too loose.
__________________
Click Here to Contact Me

Reply With Quote
  #7  
Old 9th May 2019
T_worth T_worth is offline
Biker
 
Join Date: Jun 2018
Posts: 92
Sportster/Buell Model: Xlh 1200
Sportster/Buell Year: 96
Reputation: 1226
T_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura about
Default

Quote:
Originally Posted by bustert View Post
if you research the stem seals, they must leak or the assy will fail. they use the sliding action of the stem to act as small pumps. the guide cannot get lube from any other source.
just a quikie
https://www.felpro.com/technical/tec...tem-seals.html
Right, I understand the valves "leak" to lube the stem. Makes sense. I just thought you were saying they're meant to actually leak excessively.
Reply With Quote
  #8  
Old 9th May 2019
T_worth T_worth is offline
Biker
 
Join Date: Jun 2018
Posts: 92
Sportster/Buell Model: Xlh 1200
Sportster/Buell Year: 96
Reputation: 1226
T_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura aboutT_worth has a spectacular aura about
Default

Quote:
Originally Posted by aswracing View Post
Those seals (sold under a thousand different brand names) will leak if they're driven on too far. The top of the guide starts interfering with the seal material.

The other possibility here is the valve fit in the guide being too loose.

I think I had that issue the first time. I don't have huge sausage fingers, so I couldn't push the seals on the guides with my thumbs without damaging the tiny spring like the manual states to do. If I remember correctly, I think I used a 10-12mm socket to lightly tap it in. The tiny spring looked in good condition afterwards, but maaaaaybe I tapped it in too far? How am I supposed to judge the correct placement? Is it better for the seal not to touch the guide's shoulder or is that not on enough?
Reply With Quote
  #9  
Old 9th May 2019
bustert's Avatar
bustert bustert is offline
XL FORUM TEAM MEMBER
 
Join Date: Jul 2008
Posts: 9,452
Sportster/Buell Model: 1200s
Sportster/Buell Year: 2001
Sportster/Buell Model #2: xlch
Sportster/Buell Year #2: 1974
Reputation: 2620664
bustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond repute
Default

http://tesis.com.ru/infocenter/downl...il_leakage.pdf

very good source of info
Reply With Quote
Sponsored Links
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
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 Off

Forum Jump



Sponsored Links
All times are GMT +1. The time now is 21:18.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC