• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Poor compression

  • Thread starter Thread starter Mercaholic
  • Start date Start date
M

Mercaholic

Guest
Bike model - '83 Katana 750, mileage at 35K.

Sat in outside storage for 4 years. I did a compression test to reveal the following:

1. 65 lbs
2. 35 lbs
3. 70 lbs
4. 40 lbs

It has no mechanical history but was terribly dirty from grease and road dust so I doubt anyone has even undertaken a valve adjustment.

Any ideas why such low numbers?

If I can get it to start, what are the chances that things will free up?
 
Mercaholic said:
I doubt anyone has even undertaken a valve adjustment.

Any ideas why such low numbers?

If I can get it to start, what are the chances that things will free up?
Click to expand...

1. Valve adjustment, stuck rings, rusty bore ect.

2. Very good

2 T's are vent lines...

don't part it!
 
valves are likely. free to check those, and an easy fix if indeed the culprit of such sickly numbers. pull the plugs and put some ATF/Acetone mixed at 50/50 into each cylinder, it might help dissolve whatever may be keeping th rings from sealing.
 
I would agree with the guys. Pour the ATF/Acetone to it for a day or two and while waiting check the valves.

Once you know the valves are right change the oil and plugs and see if it will fire up. If you can get it to run for a while and warm up I'm sure your numbers will come up.

My GS had sat for 7 years before I got it and the"cold" compression numbers were in the 60/70s. Once it started and ran for a while the numbers jumped into the 150+ and its been running well for 4 years now.

I think it will come back to life, these are tough bikes.

Good luck and let us know how it goes.

cheers,
Spyug
 
Put in an 1100 or 1150 motor & be done with it! Much more fun with the bigger motor & you lose the plain bearing failure issues! I have MANY motors if you need one. Ray.
 
I've used the ATF/Acetone on my 83 750E & it unlocked my seized engine. That stuff is magic.

Paul
 
You must log in or register to reply here.
Back
Top