Good set of pistons & rings in USA - Triumph Forum: Triumph Rat Motorcycle Forums
» Main Menu

Discussion Forums
 » Twins
 » Tiger
 » General
 » RAT

Features
 » Blogs

Motorcycle.com Links

Contribute
 » Photo

Motorcycle Forums
» Insurance
» Sponsors
» Our Partners
»ATV Reviews
»Motorcycle Games

Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

Reply
 
LinkBack Thread Tools Display Modes
Old 01-03-2013, 05:09 PM   #1 (permalink)
Senior Member
SuperStock
Main Motorcycle: 76' Bonneville T140
 
Join Date: Sep 2012
Location: Davis, California
Posts: 234
Other Motorcycle: 76' Montesa Cota 348
Extra Motorcycle: 76' Kawasaki KT250
Good set of pistons & rings in USA

Hello,
What would you suggest I get for my 76' T140 as far as pistons and rings here in the USA ?
Pricing seems all over the place, from $ 65.00 on Ebay to $ 450.00 at Raber's. Steadfast sells a set of pistons for $ 85.00 + $ 60.00 for the rings and they write : " You will get The brand new set of 750 .0040 over size pistons as pictured. These are the best pistons available, much better than the originals and hepolite. You can find the rings in our ebay store. "
What have you done, where did you buy from and at what price ?
Thanks guys.
Terry
frogonwheels is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 01-03-2013, 07:13 PM   #2 (permalink)
Moderator
Team Owner
Main Motorcycle: Rickman T120
 
Join Date: May 2010
Location: Victoria Australia
Posts: 4,411
Other Motorcycle: T160,TR6
The first thing you should do is measure your cylinder bore size.If it's not badly tapered or worn (0.006" or less),give it a 180 grit hone.
Then decide what compression ratio you'd like;probably no more than 8.6:1.

Then buy pistons to fit your cylinders.Even if they cost a little more than slightly oversized pistons,at least you haven't ruined a good cylinder by boring it out for nothing and wasting a lot of irreplacable bore life.

Even the cheap JCC Taiwanese pistons are more than good enough,and as good as the original.If you get Hastings rings,or NOS Hepolite rings,you'll be fine.You'll still need to check piston-to-cylinder clearance at the tightest part of the cylinder.There may be 0.0005" or so difference in cylinder sizes and piston size.Some selective assembly can help your piston clearance.

I'd always weigh pistons to make sure they're the same,at least within 0.5 gram.Sometimes you can get it a little better by swapping gudgeon pins.
Mr.Pete is online now   Reply With Quote Quick reply to this message
Old 01-03-2013, 10:03 PM   #3 (permalink)
Senior Member
SuperStock
Main Motorcycle: 76' Bonneville T140
 
Join Date: Sep 2012
Location: Davis, California
Posts: 234
Other Motorcycle: 76' Montesa Cota 348
Extra Motorcycle: 76' Kawasaki KT250
Thanks Mr. Pete. Who sells pistons to fit your final bore ? I always thought you bought a set of available piston and then bore to fit. But I understand what you are talking about, as removing too much material is always a shame !
frogonwheels is offline   Reply With Quote Quick reply to this message
Old 01-03-2013, 10:44 PM   #4 (permalink)
Moderator
Team Owner
Main Motorcycle: Rickman T120
 
Join Date: May 2010
Location: Victoria Australia
Posts: 4,411
Other Motorcycle: T160,TR6
If you need a re-bore,you'd buy the pistons first and hone the cylinders to fit them.

If the cylinders aren't badly worn,you can still fit new (same size) pistons.They may be 0.0005" bigger or smaller than the old pistons were when they were new.This is not a problem,as long as you at least have the minimum piston-to-cylinder clearance.If they're tight,hone the cylinder to fit.

Measure the bore size.It could be standard,+0.010" (unlikely),+ 0.020",or + 0.040".

Last edited by Mr.Pete; 01-03-2013 at 10:50 PM. Reason: Measure the bore size.- - - - - 0.040".
Mr.Pete is online now   Reply With Quote Quick reply to this message
Old 01-04-2013, 11:56 AM   #5 (permalink)
Super Moderator
Site Supporter
Commentator
Main Motorcycle: '67 Triumph Bonneville
 
Join Date: Aug 2005
Location: Laredo, Texas
Posts: 9,734
Other Motorcycle: British Iron
Extra Motorcycle: Dreer Norton Prototype
P.S. proper piston-to-bore difference should be .0045" try to hit that number as close as possible.

You can go a tiny bit less, too much more and it'll start smoking sooner.


Ring end gap should be .010"-.012" same thing on too little/too much.
__________________
GrandPaulZ
Author of "Old Bikes"
Born Again Bikes
My Photo album
GrandPaulZ is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Triumph Forum: Triumph Rat Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter your valid email address, that can receive an automated confirmation message. Otherwise, you won't be able to gain full access.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



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
Trackbacks are Off
Pingbacks are Off
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Decent quality pistons & rings, T140? JohnA Classic, Vintage & Veteran 1 02-19-2012 10:32 AM
Choice of pistons and rings middleson326 Classic, Vintage & Veteran 6 05-31-2011 09:00 PM
Boring, pistons, and rings billkell Classic, Vintage & Veteran 1 08-16-2008 11:17 PM
Pistons and rings for dummies "me!" Classic, Vintage & Veteran 9 04-28-2005 02:42 AM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 05:41 PM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Motorcycle News, Videos and Reviews
Honda Grom Forum Harley Davidson Forum Honda 600RR Kawasaki Forum Yamaha R6 Forum Yamaha FZ-09 Forum
1199 Panigale Forum Roadglide Forum Honda CBR1000 Forum Vulcan Forum Yamaha R1 Forum Yamaha R3 Forum
Ducati Monster Forum Harley Forums Honda CBR250R Forum ZX10R Forum Star Raider Forum Yamaha Viking Forum
Suzuki GSXR Forum V-Rod Forums Honda Shadow Forum Kawasaki Motorcycle Forum Star Warrior Forum KTM Duke 390 Forum
SV650 Forum BMW S1000RR Forum Honda Fury Forum Kawasaki Versys Forum Drag Racing Forum Ducati 899 Panigale Forum
Suzuki V-Strom BMW K1600 Triumph Forum Victory Forums Sportbikes BMW NineT Forum
Volusia Forum BMW F800 Forum Triumph 675 Forum MV Agusta Forum HD Street Forum Suzuki GW250 Forum
Yamaha Motorcycles Victory Gunner Forum Honda Vultus Forum HD LiveWire Forum Ninja H2 Forum Ducati Scrambler Forum

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.