• 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.

gs1000g and gs1100g

  • Thread starter Thread starter 27ShadeTree
  • Start date Start date
2

27ShadeTree

Guest
I believe I know this answer from the service manuals - but want to be sure. Do the GS1000G's and the GS1100G's share the same 2 valve head?
I can clearly see the 4 valve heads on other GS1100's - but the G,L,and K look the same as the 1000's. Am I correct that the 1100's were just a bigger bore but the heads are the same? I am asking due to a carburetor switch. Thank you!
 
If they are the same head, I would suspect the cams to be different. The 1100 cam lobes may hold the valves open longer or wider to let a larger volume of air/ gasses pass through.

This is coming from a carpenter, not a mechanic, so it'll be interesting to hear what others say.
 
In comparing the part numbers on Alpha Sports website, I noticed the head is in fact different, but to my surprise the cams were used in a few different engines.

11100-49830


11100-49020


intake cam 12711-49001


Exhaust cam 12721-49001


I don't understand how this works. I thought maybe since the cams were the same, the valves would be a different diameter, but that's not the case either. Although, this did exclude the 850's.

Intake valve 12911-49020


Exhaust valve 12912-49020

 
Combustion chambers are smaller on a 1000. Using the 1000 head on an 1100 will yield nearly a full point increase in compression. Conversely a 1100 head will lower the squeeze on a 1000.
The 1100 jugs with a 1000 head is a good candidate for performance cams if you can afford them. You'll make the most of longer duration valve openings.
 
You must log in or register to reply here.

Similar threads

K
Hanging idle troubleshoot help
Replies
18
Views
307
Naulty
N
sam000lee
Post GS750 > 844 Build Plug Fowling
Replies
10
Views
164
rphillips
R
P
GS1100G charging issue (yes another one)
Replies
4
Views
112
Who Dat?
W
W
cylinder question
Replies
10
Views
180
Nessism
Nessism
Syd
Ignition Coils
Replies
8
Views
308
tom203
T
Back
Top