ST1100 Final Drive Repair

Honda Pan-European 1st generation (German design)

ST1100 Final Drive Repair

Postby alans1100 » 09 Dec 2013, 06:23

For one reason or another my final drive needs to be repaired and it's more than likely due to no/wrong grease when tyres were changed by respective dealers since I've had the bike.

A used final drive unit, http://www.ebay.com.au/itm/370933277278 ... 1439.l2649 arrived a couple weeks ago and today 9/12/13 a very good used drive flange arrived from the UK.......Thanks to Keith for that.

This change over will be all new for me and it also involves swapping over the gear case covers over as they are different on the ABS model. The ABS/TCS sensor mount and the gear cover are one casting and it may prove interesting as the sensor mounting bolts haven't been undone since new.

This is an old photo but gives you an idea of what I'm talking about.

ST1100A Rear Tyre Change Over 21st December 2011 (2).JPG
ST1100A Rear Tyre Change Over 21st December 2011 (2).JPG (85.21 KiB) Viewed 12144 times


More to come after I start working on the new drive unit
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Re: Final Drive Repair

Postby Pieter Huizinga » 09 Dec 2013, 09:33

That does look intimidating Alan. What is a 'final drive' exactly?
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Re: Final Drive Repair

Postby Keith Legge » 09 Dec 2013, 09:38

These two are final drives Pieter.
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Re: Final Drive Repair

Postby Pieter Huizinga » 09 Dec 2013, 12:15

Tnx Keith. I don't get it yet. When I look final drive up in my dictionary it translates to "highest gear". But Alan and you seem to mean some hardware part.
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Re: Final Drive Repair

Postby Pieter Huizinga » 09 Dec 2013, 12:32

Looked it up. Pay attention, class:

A final drive is that part of a power transmission system between the drive shaft and the differential. Its function is to change the direction of the power transmitted by the drive shaft through 90 degrees to the driving axles. At the same time. it provides a fixed reduction between the speed of the drive shaft and the axle driving the wheels.

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Re: Final Drive Repair

Postby Keith Legge » 09 Dec 2013, 12:52

Very technical there Pieter but your right :D its the final gear case assembly, among owners its got lots of names I believe in the US its called a pumpkin.

Honda call it the final gear case take your pick but we know what it is. :lol:
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Re: Final Drive Repair

Postby flookyk1100 » 09 Dec 2013, 13:59

You both forgot to add that, on a motorcycle, the final drive like the ones shown, are only found on civilised bikes, ie those with shaft drives and not on those that use those oily, dirty chain thingies or the ones with the glorified knicker elastic (belt drives). ;)
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Re: Final Drive Repair

Postby alans1100 » 09 Dec 2013, 14:47

Pieter, The repair is to the final drive unit and if you look at the pdf in the link on page 12-3, or Final Gear Case Disassembly and look for item 7 (Ring Gear). You will see the splines in the centre part. The ring gear on my 1100 needs replacing because those splines are almost to the point of failing.

It's much cheaper to a second unit and swap it out which is what I'm doing but used ABS model drive units don't seem to come up that often so I bought one from a standard 1100. They are both the same except for the gear case cover and in order to swap drives over I need to swap the covers over (item 6) because of the ABS/TCS mount.

http://www.sharetheexperience.co.uk/ST1 ... 0Drive.pdf

Don't feel to bad Pieter, we still get people out here calling the same item a diff.
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Re: Final Drive Repair

Postby alans1100 » 09 Dec 2013, 14:51

Keith Legge wrote:its the final gear case assembly, among owners its got lots of names


Yeah..........especially if it fails..........
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Re: Final Drive Repair

Postby Ian Robinson » 11 Dec 2013, 22:35

Be very careful trying to extract the speed sensor ... from my expereince the aluminium horn easily breaks off. :(
I have transferrred the back plate from one hub to another it whines a bit on over run but has done 5000 miles no problem, apparenlty the back plate and hub are shimmed up at manufacture so that the crown gear meshes well.
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