Rear sprocket mounting dimensions?

discussions specific to the 906 Paso
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Jorian
Posts: 24
Joined: Wed Sep 25, 2019 6:37 am
model: 906 Paso
year: 1989
Location: Australia

Rear sprocket mounting dimensions?

Post by Jorian »

Can someone kindly confirm the inside diameter size of the rear sprocket?
It's a 1989 model 906.

Also, the owner's manual says it has 41 teeth, but the parts book says 40.
Is there a well accepted preference?

Thanks,
Jorian
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Derek
paso grand pooh-bah
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Joined: Thu Nov 03, 2011 10:13 am
model: 907 I.E.
year: 1994
Location: Scotland

Re: Rear sprocket mounting dimensions?

Post by Derek »

90mm according to JT sprockets : http://www.jtsprockets.com/catalogue/model/3989/

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Mc tool
paso grand pooh-bah
Posts: 1794
Joined: Wed Dec 05, 2007 12:35 am
model: 906 Paso
year: 1990
Location: Newzealand

Re: Rear sprocket mounting dimensions?

Post by Mc tool »

These bikes are fairly tall geared and mine , at 100kph in 6th gear is stumbling along at to low revs,sometimes I used 5th gear. So maybe try the 41
I wish I was young again............Id be heaps smarter than last time
Jorian
Posts: 24
Joined: Wed Sep 25, 2019 6:37 am
model: 906 Paso
year: 1989
Location: Australia

Re: Rear sprocket mounting dimensions?

Post by Jorian »

The one here has ID = 92mm, but it is evidently changed to suit an adaptor for use with a wide tyre which is no longer to be used.
The sprocket carrier is also modified unfortunately, down to 88mm.
Does anyone have a spare carrier they want to sell?
Otherwise I'll have to restore this one, which I'd rather not.

Good also to have info on the ratios, so Thanks Folks.
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Mc tool
paso grand pooh-bah
Posts: 1794
Joined: Wed Dec 05, 2007 12:35 am
model: 906 Paso
year: 1990
Location: Newzealand

Re: Rear sprocket mounting dimensions?

Post by Mc tool »

You could get a ring turned up , to fit between sprocket and carrier .....if you did it right you could use a larger/modified washers under the sprocket nuts to hold it in place
I wish I was young again............Id be heaps smarter than last time
Jorian
Posts: 24
Joined: Wed Sep 25, 2019 6:37 am
model: 906 Paso
year: 1989
Location: Australia

Re: Rear sprocket mounting dimensions?

Post by Jorian »

I found what I hope is the correct sprocket carrier, and bought it via ebay.
It was not described as being fit for a Paso, but looks identical to the one here (modified).
Jorian
Posts: 24
Joined: Wed Sep 25, 2019 6:37 am
model: 906 Paso
year: 1989
Location: Australia

Re: Rear sprocket mounting dimensions?

Post by Jorian »

The received sprocket carrier is an assembly - light metal casting plus steel sleeve, spacers, bearings etc.
The casting looks to be identical, and it's the internal parts that differ. Need to swap them for the Paso bits.
I looked at some drawings of the bevel 900SS assembly, looks like I need to do some press work.
Anyone done this, have any tips or warnings?
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