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asking for a friend and fellow gs owner

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I have a friend who has a gs650L shaft drive. He is wanting to know how to change his gears for more power like we would if we changed our sprockets? Any help you could give me to rely back to him would be greatly appeciated.
 
Its simply not something you can pick up at the parts store. Certainly if one had access to a CNC mill or something of the like you could probably, if you knew enough about ratios and gears and such, make some, but they're just not a change out part. If the guy wants more power, Im afraid his only real option is to sell the bike and buy something larger.
 
Smaller or larger tire. Each change in tire size results in a 250 rpm engine speed change. That's it.

A 110 is as low as I went on the back. Acceleration was noticeably improved but it wound like crazy on the highway. I went with a 130 tire the last time.
 
kparkfan said:
I have a friend who has a gs650L shaft drive. He is wanting to know how to change his gears for more power like we would if we changed our sprockets? Any help you could give me to rely back to him would be greatly appeciated.
Click to expand...

I think BMW is the only motorcycle that offers optional ring and pinion sets.

Only hope I see is looking for some final drives from some smaller cc bikes and see if they are interchangable. Smaller cc bikes tend to have a lower numarical gear ratio.

Maybe if you feel really gitty you can see what swaps in the trannys and clutch basket gears.
 
Get it running right.

I've never heard anyone with a good-running 650 bitch about the amount of power.
 
Are you sure your rpm changed 250 rpm by going from a 110 to a 130 tire?? Put a larger tire on the front, your speed will drop per rpm.
 
bwringer said:
Get it running right.

I've never heard anyone with a good-running 650 bitch about the amount of power.
Click to expand...

Yeah, my guess is there's something else missing. I go through the gears like a demon, and on the highway often find myself kicking the shifter wishing for a 6th gear. In this case a bigger tire would help me, but then I'd loose all my fun picking gears in the twisties - there's one for every corner!
 
rphillips said:
Are you sure your rpm changed 250 rpm by going from a 110 to a 130 tire?? Put a larger tire on the front, your speed will drop per rpm.
Click to expand...
It changed by 500 rpm. 250 rpm for every size change, in this case 2 sizes.This is at 60 mph. At higher speeds the difference was even greater. 120 is the standard size so to speak, 130 is the practical max, I do not believe a 140 would fit and I'm not about to buy one to find out.

We are talking about back tires not front.
 
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Ive got a 650 and Im kinda big guy. Im 6-4 at about 260lbs. Mine will slide me deep in the seat if I twist a little too hard on the throttle. Some carb, ignition and tuning would be more in order.
 
The 650G is not the strongest GS but has a good balance of weight and power. Top end is not that high and it's been said a taller gear would be a better thing. But it is what it is.
 
If the bikes a GL, you might want to look for a regular G wheel which is larger diameter. That plus running a 130 tire would be the pratical max I think.
 
rphillips said:
Are you sure your rpm changed 250 rpm by going from a 110 to a 130 tire?? Put a larger tire on the front, your speed will drop per rpm.
Click to expand...
Only the indicated speed will drop. The bike will still be moving just as fast, but the speedo will be showing a lower speed.

To change engine speed in relation to road speed, you need to change the rear tire.

.
 
I would find out the installed size of various tires if you want to be sure. I found that the tire increases in diameter 3/4" for every tire size. A 110 looks noticeable smaller than a 130 ON THE BACK and it's a great deal wider BETWEEN THE REAR SWINGARM.
 
Not to hijack, but did I read somewhere that the final drive off an 1100GK is geared higher than but will bolt on an 1100Gl? Would it be a no-brainer swap without modification?
 
The difference is minuscule. I think it ws 3.03 to 3.13 or something like that.

And I don't think it's a bolt in
 
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