• 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.

Bore kit

  • Thread starter Thread starter ohgoodtimes
  • Start date Start date
O

ohgoodtimes

Guest
Does anyone know where i could find one for my 83 750e? Also is it more practical (for cost, effort, etc) than doing the swap for the 700 pistons cams and so on?
 
Effort will be basically the same either way. No clue about cost or effectiveness, it's gonna depend a lot on what compression ratio you go with and other stuff.
 
Timely question.


I don't know of any aftermarket big-bore kit for our bikes, and the 700 pistons will gain you nothing but a bit of extra compression.


I've heard that cams from the 1100 can be used for a greater power increase than the 700 cams, but can't remember if it's the 1100E/ES cams or the 1150 cams. Can someone shed some light?



I do seem to believe that someone made an 850 kit for the '83-up 750 at some point, but I could be mistaken.

-Q!
 
Direct from wiseco

GS750 1980-84 (4-Valve)​
Kit includes: (4) Pistons, Ring Sets, Piston Pins, Retainer Clips, and (1) CFM20 Head Gasket

816cc​
​
​
2.756" or 70.00mm K816 10.25:1 Cylinder boring only - 1983 GS750ED & GS750ESD must use modifi ed OEM Head Gasket
3mm oversize $577.33 Piston: 4188M07000 $135.71 Rings: 2756XC Piston Pins: S555 Retainer Clips: CW18​

Stroke - 53mm CFM20 Head Gasket: W4937 $52.36 Optional Base Gasket: W6064 $14.04


I have their 844 kit for the 2 valve head and I am way wayyyy happy with it. I also have a built up B12 but I like the ol 750 better Its a much more pleasant ride but the power is there when I want it. PULLS VERY HARD all way to redline and beyond.

 
I would think some added compression would make a sizeable difference on these engines...

Dan :)
 
Hey dizzi are you using the stock cams or did you opt for aftermarket parts? I still like the 700 idea, i just have to price everything out.
 
Dizzixx said:
Direct from wiseco

GS750 1980-84 (4-Valve)​
Kit includes: (4) Pistons, Ring Sets, Piston Pins, Retainer Clips, and (1) CFM20 Head Gasket

816cc​
​
​
2.756" or 70.00mm K816 10.25:1 Cylinder boring only - 1983 GS750ED & GS750ESD must use modifi ed OEM Head Gasket
3mm oversize $577.33 Piston: 4188M07000 $135.71 Rings: 2756XC Piston Pins: S555 Retainer Clips: CW18​

Stroke - 53mm CFM20 Head Gasket: W4937 $52.36 Optional Base Gasket: W6064 $14.04


I have their 844 kit for the 2 valve head and I am way wayyyy happy with it. I also have a built up B12 but I like the ol 750 better Its a much more pleasant ride but the power is there when I want it. PULLS VERY HARD all way to redline and beyond.
Click to expand...
sounds to me like that's for the earlier 4v... do the pistons interchange?
 
The bores on the first generation four valve GS750 ('80-'82) and second gen four valvers ('83-'86) are the same, so the overbore kits are the same. Wiseco does say on their site that if you use the kit in a GS700, there is a modification that has to be made (a spacer I think) to allow added clearance below the valves due to different piston dome shape.

I may be doing this to my 700ES in the next year or two due to compression has fallen into the 130ish range on my bike. Still not bad, considering it has 61,000 miles on it.
 
Last edited:
Yeah I have stock cams. As well as stock carbs. There is still a very noticable difference.
 
You must log in or register to reply here.
Back
Top