The Sportster and Buell Motorcycle Forum - The XLFORUM®
 

Go Back   The Sportster and Buell Motorcycle Forum - The XLFORUM® > SPORTSTER MOTORCYCLE FORUM > Sportster Motorcycle Era Specific and Model Specific > Ironhead Sportster Motorcycle Talk (1957-1985)
XLF Blogs XLF Arcade XLF Disclaimer/Privacy Statement/Terms Of Use

Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

Active Threads
0 Hammer 1250
Last Post: Pagey
Posted On: 37 Minutes Ago
Replies: 11
Views: 481
0 3/4” Axle Drum Brake ??
Last Post: thefrenchowl
Posted On: 1 Hour Ago
Replies: 4
Views: 108
0 ....1
Last Post: DEEP DIVER
Posted On: 1 Hour Ago
Replies: 5,559
Views: 323,740
0 primary cover
Last Post: smoggy
Posted On: 1 Hour Ago
Replies: 0
Views: 9
5 Eye Protection When Riding?
Last Post: Ireeman
Posted On: 1 Hour Ago
Replies: 280
Views: 69,317
0 Inherited Ironhead
Last Post: Ireeman
Posted On: 2 Hours Ago
Replies: 13
Views: 572
0 What did you do for your sporty Today?
Last Post: bordens
Posted On: 2 Hours Ago
Replies: 6,964
Views: 987,580
0 New Guy with Experienced Bike
Last Post: Folkie
Posted On: 2 Hours Ago
Replies: 9
Views: 70
8 Inexplicable miss
Last Post: Ireeman
Posted On: 3 Hours Ago
Replies: 20
Views: 281
0 normal shifter shaft wobble
Last Post: Hippysmack
Posted On: 3 Hours Ago
Replies: 11
Views: 328
0 New guy from IL
Last Post: IXL2Relax
Posted On: 3 Hours Ago
Replies: 8
Views: 78
0 Coil readings
Last Post: IXL2Relax
Posted On: 3 Hours Ago
Replies: 6
Views: 128
0 Front Brake Upgrade
Last Post: Hippysmack
Posted On: 3 Hours Ago
Replies: 30
Views: 7,997
0 1992 XL ignition explained
Last Post: IXL2Relax
Posted On: 3 Hours Ago
Replies: 12
Views: 637
14 I just kind of stumbled in here... like 100 times.
Last Post: Ireeman
Posted On: 4 Hours Ago
Replies: 27
Views: 362
0 Ignition advice
Last Post: Ireeman
Posted On: 4 Hours Ago
Replies: 24
Views: 274
0 Chinese S&S carbs
Last Post: Highly-Dangerous
Posted On: 4 Hours Ago
Replies: 40
Views: 1,511
0 41mm V-Twin Narrow-glide conversion for XL
Last Post: Ireeman
Posted On: 5 Hours Ago
Replies: 14
Views: 656
0 Bandanas
Last Post: Ireeman
Posted On: 5 Hours Ago
Replies: 19
Views: 839
0 Top end failure
Last Post: Mission1
Posted On: 6 Hours Ago
Replies: 20
Views: 728
0 Hottie of the day, no nudity.
Last Post: trainman
Posted On: 6 Hours Ago
Replies: 20,032
Views: 2,041,038
0 XR mutt race bike progress
Last Post: Scott
Posted On: 7 Hours Ago
Replies: 17
Views: 765
0 Proven external Fuel pump and regulator
Last Post: rocketmangb
Posted On: 8 Hours Ago
Replies: 7
Views: 75
0 What brake upgrade options does 1999 Sportster have? This is what I found!
Last Post: Hippysmack
Posted On: 9 Hours Ago
Replies: 28
Views: 1,596
0 Info needed on mini sumps.
Last Post: Ferrous Head
Posted On: 13 Hours Ago
Replies: 39
Views: 1,428
0 Converting 2003 engine to fuel injection setup from 2007&UP model
Last Post: Randy_rots
Posted On: 13 Hours Ago
Replies: 15
Views: 1,816
0 Top end reassembly...what goes where!?!?!
Last Post: doodah man
Posted On: 14 Hours Ago
Replies: 8
Views: 164
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Graywolf
Posted On: 14 Hours Ago
Replies: 47,732
Views: 7,642,603
0 UltraCool oil cooler safety concern
Last Post: NGOT8R
Posted On: 14 Hours Ago
Replies: 17
Views: 350
0 Run external oil filter? 68 xlch
Last Post: Akdawg
Posted On: 17 Hours Ago
Replies: 31
Views: 1,411
More...
Members Birthdays
warpusher, Terp84Alum, FiremistSLK (74), moony956 (72), E.H-57 (63), bplinson (56), fbroos73 (47), prefect (40), bamf_shadow (38), jakebuganski (38), Arwalkz007 (37), Fraser19 (31)
Reply
 
Share Thread Tools Display Modes
  #11  
Old 4 Weeks Ago
mickey t's Avatar
mickey t mickey t is offline
Land Speed Record
 
Join Date: Jan 2015
Posts: 732
Sportster/Buell Model: ironhead sporty
Sportster/Buell Year: 79
Reputation: 109791
mickey t has much to be proud ofmickey t has much to be proud ofmickey t has much to be proud ofmickey t has much to be proud ofmickey t has much to be proud ofmickey t has much to be proud ofmickey t has much to be proud ofmickey t has much to be proud ofmickey t has much to be proud ofmickey t has much to be proud ofmickey t has much to be proud of
Default

Quote:
Originally Posted by Staffords View Post
They are serviceable. I would still like to replace them though. Its an eyesore. Top end job is easy enough to do.
Build it up by Welding it...every 4th pass you shape it...

Sent from my SM-J260A using Tapatalk
Reply With Quote
  #12  
Old 4 Weeks Ago
mrmom9r's Avatar
mrmom9r mrmom9r is offline
XL FORUM TEAM MEMBER
 
Join Date: Jan 2011
Posts: 2,164
Sportster/Buell Model: dragbike
Sportster/Buell Year: 1960
Reputation: 244210
mrmom9r has a brilliant futuremrmom9r has a brilliant futuremrmom9r has a brilliant futuremrmom9r has a brilliant futuremrmom9r has a brilliant futuremrmom9r has a brilliant futuremrmom9r has a brilliant futuremrmom9r has a brilliant futuremrmom9r has a brilliant futuremrmom9r has a brilliant futuremrmom9r has a brilliant future
Default

I actually prefer the D.S. pistons to OEM for the simple reason that piston metallurgy is constantly improving as time marches on and the "newest" NOS 900 pistons would have been made in the early 70's at the latest.
Reply With Quote
  #13  
Old 4 Weeks Ago
Staffords Staffords is offline
Greasemonkey
 
Join Date: Oct 2014
Posts: 126
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1978
Reputation: 3983
Staffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the rough
Default

I am not too concerned with salvaging the cylinders that are currently on it. I'm not sure if they are original or not, but I have a set of OEM NOS cylinders on their way to me that i found for cheap. The take offs will go on a shelf to possibly be repaired someday.

I will weigh the the stock pistons (assuming thats what I find when I pull it apart) against the TRW forged pistons to see how much the difference is. How much of a difference in weight is acceptable before rebalancing the lower end becomes necessary?

Someone has suggested to me that these old motors were probably not 100% perfectly balanced when they left the factory anyway and that it should be fine.
Reply With Quote
  #14  
Old 4 Weeks Ago
11B40 11B40 is offline
XL FORUM TEAM MEMBER
 
Join Date: Dec 2008
Posts: 971
Reputation: 84238
11B40 has much to be proud of11B40 has much to be proud of11B40 has much to be proud of11B40 has much to be proud of11B40 has much to be proud of11B40 has much to be proud of11B40 has much to be proud of11B40 has much to be proud of11B40 has much to be proud of11B40 has much to be proud of11B40 has much to be proud of
Default

There are a lot of things you can do to the fins to make them presentable. Out on the West Coast it was in vogue to trim them to some shape, make them square, remove some fins etc. If they are going to be junk, why not. I used a set off a hot bike from the Fremont area, had matching heads with XLR valves. I would be reluctant to weld the problem away.
Forged pistons may be a bit noisy when cold as in "Rattle, Rattle" We all used Hastings cast iron rings, they seated in better and were just an all round great part.
Reply With Quote
  #15  
Old 2 Weeks Ago
Staffords Staffords is offline
Greasemonkey
 
Join Date: Oct 2014
Posts: 126
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1978
Reputation: 3983
Staffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the rough
Default

Update:

Stock STD bore cast pistons and wrist pin weigh 444 grams each.

TRW. 030 over forged pistons and wrist pin weigh 480 grams each.

Is the 35 grams difference enough to worry about needing to rebalance?
Reply With Quote
  #16  
Old 2 Weeks Ago
needspeed needspeed is offline
XL FORUM LIFE MEMBER
 
Join Date: May 2014
Posts: 1,172
Sportster/Buell Model: xlh
Sportster/Buell Year: 1974
Reputation: 435678
needspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond repute
Default

I can't give a definitive answer because honestly I don't know, and you'll probably get several different answers depending on who you talk to.

You have to consider whether the balance with the stock pistons is right to begin with. You'll hear that balancing a harley is a compromise, because it is. It will never be smooth in all RPM ranges. You could probably put them in as is and not have a problem (maybe).

Sorry about the non answer, but here's a link to a thread about the same issue.

http://xlforum.net/forums/showthread.php?t=2075045
Reply With Quote
  #17  
Old 2 Weeks Ago
brucstoudt's Avatar
brucstoudt brucstoudt is offline
Senior Master Custom Bike Builder
 
Join Date: May 2010
Location: Pottstown PA.
Posts: 13,802
Sportster/Buell Model: xlch
Sportster/Buell Year: 1960
Reputation: 515799
brucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond repute
Default

are the TRW's such a spectacular deal that you can't refuse?the cast pistons from D.S. offer no issues to deal with.
__________________
72 1000cc barrels and heads, s&s 41/2'' flywheels, sifton cams, s&s super B w/ zippers thunderjet w/yost powertube, andrews gears,and shafts, competition engineering kevlar wet or dry clutch, 72 oil pump, morris magneto w/auto advance and single fire module, cycle electric generator w/electronic regulator,73 cu.in.
Reply With Quote
  #18  
Old 2 Weeks Ago
needspeed needspeed is offline
XL FORUM LIFE MEMBER
 
Join Date: May 2014
Posts: 1,172
Sportster/Buell Model: xlh
Sportster/Buell Year: 1974
Reputation: 435678
needspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond repute
Default

That's a good point Brucstoudt. If this a just a normal top end overhaul on a street bike there's no need for forged pistons. And the cast are actually pretty inexpensive. Certainly cheaper than balancing or lightening the forged ones.

Also a consternation eliminator.
Reply With Quote
  #19  
Old 2 Weeks Ago
Medyo Bastos Medyo Bastos is offline
Biker
 
Join Date: Jul 2018
Posts: 64
Sportster/Buell Model: xlch
Sportster/Buell Year: 1966
Reputation: 10
Medyo Bastos is an unknown quantity at this point
Default

Does anyone gave a link for the ds pistons?


Sent from my iPhone using Tapatalk
Reply With Quote
  #20  
Old 2 Weeks Ago
Staffords Staffords is offline
Greasemonkey
 
Join Date: Oct 2014
Posts: 126
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1978
Reputation: 3983
Staffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the roughStaffords is a jewel in the rough
Default

Quote:
Originally Posted by brucstoudt View Post
are the TRW's such a spectacular deal that you can't refuse?the cast pistons from D.S. offer no issues to deal with.
The TRW pistons were only $35. I bought them because they are out of production and it doesn't seem like there are many options for 900 pistons. Figured I'd buy them while theyre still available. Even if i don't put them in this motor right now, for $35 I felt like it was worth having them on the shelf to maybe use in the future.

I also bought a pair of original NOS STD Harley cast pistons that I found on ebay. They don't look nearly as nice but they are serviceable. I will just use those if I decide not to use the TRW.

I'm not planning on building a hopped up hot rod. Just building a solid XLCH that runs well.
Reply With Quote
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



All times are GMT +1. The time now is 11:24.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC