Anyone got a r1100gs final drive fitted on a 1150gs

[daverimm19]

What does everyone think. Worth doing or not?


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[cbrgaz]

I have one fitted and for low speed commutes it makes first more usable without the need to slip the clutch. It's a definate mod to do especially if you lug a passenger and luggage regularly.

 

[Ian J Hartley]

I have one fitted and for low speed commutes it makes first more usable without the need to slip the clutch. It's a definate mod to do especially if you lug a passenger and luggage regularly.

I agree, I've had one fitted for over a year now, and I find the bike far more manageable.

Good points
1. Pulling away in first gear easier.
2. Get to use 6th gear all the time on A class roads
3. Can pull away and overtake in 6th gear at national road speed limits.
4. I find that because I'm in top for longer the MPG has improved.
5. Used to get 43-45 mpg now get 48-52 mpg.
6. Acceleration is improved.

Bad points
1. Long distance motorway mileage should be avoided.

I was considering refitting my original for a trip to Berlin. But decided to keep the 1100 unit on, mainly because at 80mph I'm below 4000 rpm and with a loaded bike it would be easier. The extra fuel useage on motorways/autoroutes shouldn't be too much of a problem, if I stick to comfortable speeds. I still get 200 miles out of a standard tank.

Ian

 

[daverimm19]

Cheers guys. I don't do much motorway but when I do its 80 mph cruising. Sounds like a good mod. I suppose all I need to do now is find one at a decent price


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[Ian J Hartley]

Cheers guys. I don't do much motorway but when I do its 80 mph cruising. Sounds like a good mod. I suppose all I need to do now is find one at a decent price


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Good luck with that!

Try and make sure you get one with known mileage. The R1100GS is old so end of life units will be high mileage with lots of wear.

Mine came unknown mileage, so I had to dismantle it to check bearings and for wear on the crown and pinion, that means a minimum of the large bearing oil seal, and the rubber o ring gasket to seal both halfs of the casing. My bearings were OK, so reassembled, and once fitted monitor it. Both for leaks and or any metal in the oil.

Ian

 

[daverimm19]

Thanks for the advice


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[Hay Ewe]

interesting
here in Aus with 100km/hr (64mph) speed limit, being in 6th - and legal speed - it often feels as though the engine is labouring but 5th is too hihg
as others have said, two up with kit makes it worse.

Thanks for this, futher investigation required!

cheers

 

[daverimm19]

what about a 32/10 off a 850rt would be 3.2 would that be too far? any idea what i would loose top end?


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[Ian J Hartley]

Here you go! Fill your boots!

I'm not going to explain how it works, read the text, but it will enable you to select the final drive and gear box combination to see how they all compare.

http://www.largiader.com/articles/gearing/

Ian

Edit
I calculate that with that combination you will be reving the nuts off it. At 4000 RPM you will be doing about 73 MPH.

( 6th gear = 22 MPH at 1200 RPM therefore 4000RPM divided by 1200 RPM = 3.33 x 22MPH = 73MPH)

Dead easy to do wheelies

 

[daverimm19]

Cheers. I'll take a look


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[Hay Ewe]

i just had a look at that graph system thing and I am not able to understand how it works
I have a standard 1150GS, could some one explain what I am seeing please?

thanks

 

[Ian J Hartley]

The column labelled 1998-2006 is the one you are interested in. You have probably got a standard gear box so the Std column is the only one you are interested in.

Move down that column only and select whichever final drive ratio you are looking for. Your standard 31:11 will be 2.82 (31 divided by 11).

The R1100GS final drive is 33:11, which is 3.00.

Select that.

The two graphs will overlay.

Now read off the road speed (vertical line ) for any given gear (horizontal line) and that is the speed you will be doing at 1200 rpm. Just multiply up to get the speed at 4000 rpm (which is roughly the crossover point for economy)

Ian

Edit
I should add that at the bottom of the table you can select the option of either 1200 or 5000 rpm for scales.

 

[Paul Young]

I used that tool to check out FDs about 5yrs ago. I was getting frustrated with my 1150 at the IOMTT as I found 5th too low (hitting the rev limiter) but 6th too tall (bike slowed down). I considered dropping the gearing, like you, so that 6th would be more useable but ended up going up the gearing and settled on an R1100S at 2.75:1. This has been brilliant as it has extended each gear, made no noticeable difference to the acceleration and means that the bike no longer bounces off the limiter in 5th. Each gear is marginally longer, IYKWIM, so it's also pretty flexible with less gear changes needed. 6th is now only used on motorways but drops cruising rpm by about 500.
Worth considering unless you travel a lot two-up or with loads of luggage in stop/start traffic.

 

[Hay Ewe]

Thank you
my work computer didnt show the grid or the mph on the side
it makes sense now.
thanks

 

[davegs]

I did this mod for a long trip involving a lot of off roading, brilliant. Changed it back when back home for a week!! changed it back such an improvement fore road work, saves your clutch as well, do it.!!

 

[daverimm19]

I'm going to. Just need to find one. Was thinking of RT cams too


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