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Joined: Oct 2001
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Hi folks -

I bought a set of RIken Rings for my 1967 BSA A65 from a reputable dealer. I can discern no difference in appearance between what would be the top two rings.

The rings are marked with an R - I assume that's the top?

BTW - the reason for the oil burning in my bike was a stuck oil ring. I took the cylinders to the local machine shop and they specced the bore as nicely Concentric, and well within the original specs.

One of the valve stems had a slightly mushroomed top, so I decided to get all new valves. And well, if you get new valves, you might as well get new springs.


And in a fit of "screw it" I bought a Bob Newby clutch kit.

rings.jpg
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Confirmed from the vendor R faces up, and rings one and two are identical in this case.

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Many compression rings are identical for first and second rings. modern piston designs tend to use different ring thicknesses, thinnest usually at the top, often one of those rings are chromed too though it isn't always the top one.

You won't be upset with the BNR clutch, but be prepared to go a tooth less on the gearbox sprocket as the primary ratio is taller by the equivalent of 1 tooth more on the final drive.


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (now rebuilt)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

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Ugh -I am already at a 21 tooth front sprocket and had to source a 107 link chain to fit properly - 21/47 - so I'd have to go to a 19, I guess, since a 20 was supposed to be stock.

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Good point Allan. I recently fitted the BNR to my streetbike. I find the 19 to be very comfy on the highway and still snappy at lower speeds however if I was commuting or taking longer rides on interstates maybe the 20 would be better. The 21 would rob too much character from the old girl. Chains can be adjusted to suit the job. Cheers, PRT

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Thanks for the input - I have spare chains as a result of the trial and error arriving at the 107 link requirement, so I'm good there.

Time to go out to the garage and work on the bike!

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Originally Posted by pushrod tom
Good point Allan. I recently fitted the BNR to my streetbike. I find the 19 to be very comfy on the highway and still snappy at lower speeds however if I was commuting or taking longer rides on interstates maybe the 20 would be better. The 21 would rob too much character from the old girl. Chains can be adjusted to suit the job. Cheers, PRT

I still have the 19:42 (close equivalent to 21:47), It works ok, but the motor has to be in top condition and it means some clutch slippage at slow speeds. But when its rolling it will pull! The cylinder head has started weeping on the left side so it needs to come off, its enough with that gearing to knock the power back quite a bit and the top speed.

I have a selection of speckets which I can fit, but will ultimately go smaller. I did run 19:47 with the BNR at one point (to an international rally) It did seem a little undergeared on the motorway (freeway) till I got used to it, but it went well enough and covered over 1000 miles that week. I changed back up as the clutch gripped that well that I unintentionally lifted the front end a few times - my pillion wasn't impressed. laugh


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (now rebuilt)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)


Moderated by  Allan G, Jon W. Whitley 

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