• 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.

Is there any way to reduce 5th gear RPM on a 79 GS850

  • Thread starter Thread starter 79GS850VETTER
  • Start date Start date
Colin Green said:
Hey Ian :D Cool 5th gear option, but my 85 GS1100G does 4000rpm at 100? does that mean that mine is an oddity? Did you also change your shaft when you put the 1100 diff in?
Click to expand...

Giday Colin

As Steve has said, the 1100G gearing is already higher than the 850's. No need to change the shaft to match the 1100 diff unless fitting the 1100 engine to the 850 frame, which I haven't done.
 
I never considered putting bar weights on. Do they make a big difference.

I've ridden this same bike for almost 200 000 kms over the past 31 years. Its not that I am "whining" like someone suggested, I would like to make the bike be it's best. It has a lot of sentimental value to me and I would like to ride it for a long time yet.

I am usually the guy in the pack using the most fuel as well so I would not mind trying a different trany or final drive and see what it does to the fuel milage.

49er, when you put the new gearing in and the new rear diff did it adversly affect your start up in 1st gear. It would seem that 800 rpm difference is about a gears worth. Would you compare the start up to starting in second with the old gears?
 
79GS850VETTER said:
I never considered putting bar weights on. Do they make a big difference.

I've ridden this same bike for almost 200 000 kms over the past 31 years. Its not that I am "whining" like someone suggested, I would like to make the bike be it's best. It has a lot of sentimental value to me and I would like to ride it for a long time yet.

I am usually the guy in the pack using the most fuel as well so I would not mind trying a different trany or final drive and see what it does to the fuel milage.

49er, when you put the new gearing in and the new rear diff did it adversly affect your start up in 1st gear. It would seem that 800 rpm difference is about a gears worth. Would you compare the start up to starting in second with the old gears?
Click to expand...

I have only fitted the higher diff at this stage. No problems with starting in 1st gear. When I rebuild my spare 850, I will fit the higher 5th gear to it. I'm not expecting any problems with 1st gear then either. I'm expecting it will be equivalent to the 1st gear of my 1150 with both the diff and 5th gear changes together.
 
49er said:
I'm expecting it will be equivalent to the 1st gear of my 1150 with both the diff and 5th gear changes together.
Click to expand...
You are probably correct, as far as gearing is concerned.

The difference is that the 1150 has more torque, and is better able to handle the taller gearing. :o

.
 
The 2.9 rear end does force more clutch slipping on the 850 but it's not too bad on a naked bike. If you are packing a load though it may be a consideration.

ShaftDriveGSgearratios.jpg
 
Someone just posted a 1983 GS1100G in the Parts For Sale forum. Someone should swoop in and grab that rear end if they want the 2.9 ratio version.
 
I just went from a 15 tooth to a 16 tooth front sprocket, should get me 300-400 rpm drop at highway speed. Oh wait, you don't have sprockets. :-\\\

The bar weights do make a difference. You can also make a homemade version of a bar snake. I did both on my KZ750 and it helped quite a bit. Brian ended up with my Manic Salamanders when it became evident the KZ was going to go away. ;)

If you want to know how to make a bar snake, I can post it here in the tech section. There are a couple of paths you can take.
 
DIY barsnake

DIY barsnake

I'd be interested in barsnake instructions
 
Ya I would like to know as well. Let me know when you post it. Thanks
 
Nessism said:
The 2.9 rear end does force more clutch slipping on the 850 but it's not too bad on a naked bike. If you are packing a load though it may be a consideration.

ShaftDriveGSgearratios.jpg
Click to expand...

Ed, I haven't experienced any clutch slippage since fitting Barnett plates and 1/2 a set of HD springs. Perhaps I'm just not making enough HP!! ;)

Still have ample passing torque from 80 kph onwards in 5th though.:dancing:

On my next big bore 850, the capacity will be 1023cc. I doubt that lack of torque will be an issue with that, even with the higher 5th gear set fitted.
Cr will be raised to 11-1 too.
 
49er said:
Ed, I haven't experienced any clutch slippage since fitting Barnett plates and 1/2 a set of HD springs. Perhaps I'm just not making enough HP!! ;)

Still have ample passing torque from 80 kph onwards in 5th though.:dancing:

On my next big bore 850, the capacity will be 1023cc. I doubt that lack of torque will be an issue with that, even with the higher 5th gear set fitted.
Cr will be raised to 11-1 too.
Click to expand...

Should have clarified maybe, the clutch slipping business is in reference to an earlier question about getting off the line from a stop with the taller rear end - requires more clutch slipping. Regarding that monster of yours, good luck with that. Building stuff is cool.:cool:
 
Nessism said:
Should have clarified maybe, the clutch slipping business is in reference to an earlier question about getting off the line from a stop with the taller rear end - requires more clutch slipping. Regarding that monster of yours, good luck with that. Building stuff is cool.:cool:
Click to expand...

Yeah, that clarification makes sense now.

I will set up a thread with progressive pics, once I start the next BB project.

Incidentally, I find the 850's 1st gear quite low, even with the 2.9 diff fitted. Minimal slippage required when pulling off the line. Having a very wide power band also helps. The higher 5th gear won't change the clutch slippage demands, off the line .
 
You must log in or register to reply here.
Back
Top