Motorcycle-Journal Forums  

Go Back   Motorcycle-Journal Forums > Maintenance > Mechanics Corner
Motorcycle Journal       Suzuki Bikes       Honda Bikes       Yamaha Bikes

Mechanics Corner Looking for answers to mechanical questions? Just can't get it to run right? Got a tip for increasing HP? This is your forum!


Welcome to the Motorcycle-Journal Forums forums.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.
Reply
 
LinkBack Thread Tools
Old 11-10-2005, 09:59 PM   #1 (permalink)
Newbie
 
Joined: Nov 2005
Posts: 1
Default compression for a jr50

Son's jr50 seems weak, restrictors removed and compression about 90psi anybody know the minimum pressure? time 4 a top end?

mytoys is offline   Reply With Quote
Sponsored Links
Suzuki Motorcycle Info  Honda Motorcycle Pictures  Kawasaki Motorcycle Resource  Yamaha Motorcycle
Old 11-11-2005, 03:36 PM   #2 (permalink)
Newbie
 
Zooki's Avatar
 
Joined: Nov 2005
Bike: PE250, RM250
Location: Sydney Australia
Posts: 19
Default

^^^^^^^^^ 90psi is not much at all and I suspect the bike must be very hard to start if at all.

Definitely time for a rebuild assuming you have done the compression test correctly and hence have an accurate reading.
Zooki is offline   Reply With Quote
Old 11-11-2005, 08:18 PM   #3 (permalink)
Fender Buffer
 
2005GZ250's Avatar
 
Joined: Sep 2005
Bike: 2005 GZ250 1973 "heavyoldandslow" GT750
Location: Roland, AR
Posts: 439
Default

Put a little oil in the cylinder and rotat the engine a few times then redo the compression test again, if the rings are worn you should get a slightly higher reading with some oil in the cylinder.
2005GZ250 is offline   Reply With Quote
Reply


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

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 On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
compression leak viper94bite Mechanics Corner 1 03-09-2006 12:41 PM
Compression and octane Scott58 The Paddock 4 08-11-2005 11:22 PM
compression for 86 lt 50 flojo805 Dirt Bikes & ATV's 1 07-29-2005 08:41 PM
No compression, new top end? sungoddesss1117 Mechanics Corner 3 03-21-2005 11:20 AM
Compression huh? (more power please) Voimakas Mechanics Corner 5 08-13-2004 01:09 AM


All times are GMT -5. The time now is 10:38 AM.
Blackbird Forums


Copyright 2008, Suzuki-Bikes.com
Motorcycle-Journal Forums

SEO by vBSEO ©2008, Crawlability, Inc.