Main Motorcycle: 76' Bonneville T140
Join Date: Sep 2012
Location: Davis, California
Other Motorcycle: 76' Montesa Cota 348
Extra Motorcycle: 76' Kawasaki KT250
Thanks to both of you for " reassuring " me I was not crazy in over thinking the rear chain on a T140. You both are showing each side of what I have found out so far : most say it takes 107 links for the T140 and yet, the factory 76' shop manual states it takes 106 links.
My 76' Bonneville had when I bought it a DID chain with 106 links. The sprockets are the stock 20 tooth in the front & 47 tooth in the rear.
That chain was half-way worn out, but fitted perfectly with the axle mid-way in the swingarm slot.
I ordered new sprockets and through a friend, I got a RK-M chain with 106 links. This chain is NOT Chinese. It is made in Malaysia under the ownership of RK Japan with the same steel from Japan. All Japanese motorcycle manufacturers have plants in Malaysia ( Kawasaki 650 KLR has been built there for 28 years for example ) and it made sense for RK Japan to open a factory there to provide OE for all these customers with cheap labor cost )
The RK-M ( M for Malaysia ) is exactly the same size and fit as the old DID I took out. And it is rated for 6800 lbs, which is in reality pretty good for a cheap chain in cost.
Yet, because it is rated for 400cc, I got a bit worried it would be under-specked for the torque of our Bonneville Triumphs.
I called Raber's in San Jose CA, and was told ALL Bonneville should take a 107 links chain. Was told they sold 33 such chains this year for T140 specs.
So, here we are : until I get my new sprockets and do install the chain, I am still not sure what number of links will be needed.
Funny stuff about an odd number of links, I was like Snakeoil as it didn't make sense. Thanks to Morris the cat and his photo of the extra odd weird link, I would have never believed it.
All Raber's chain are even numbered ( 106, 108 ) but they have one Diamond chain for the T140 with....107 links ! That is the one I ordered. When I get it, I will install it and let you know how it all worked out.