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#718041 - 12/07/17 4:40 pm Testing cranks and rods  
Joined: Dec 2017
Posts: 9
ferretjuggler Online content
BritBike Forum member
ferretjuggler  Online Content
BritBike Forum member

Joined: Dec 2017
Posts: 9
England
I've got an A65 OIL project coming along at present.
The bike is a basket case (bits from several bikes actually)
The original crank and the DS rod were trashed beyond repair, but I've now got a used crank that has two grinds left, and a nice looking pair of used rods.
But I know absolutely nothing of the history of these components except what their visual appearance tells me.
I've heard of people getting cranks X-rayed or magnafluxed to check for hidden cracks or defects, but I'm not really sure how far to go.
I'm not planning on going racing on this bike, but on the other hand I do believe in using them for what they were made for.

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#718049 - 12/07/17 5:37 pm Re: Testing cranks and rods [Re: ferretjuggler]  
Joined: Apr 2015
Posts: 98
Simon Ratcliff Offline
BritBike Forum member
Simon Ratcliff  Offline
BritBike Forum member

Joined: Apr 2015
Posts: 98
Wolverhampton, U.K
I got my 150,000 mile crank (Norton Commando) checked 3 years ago using the magnaflux type method. Cost was flat rate of £50. No problems with mine but they showed me a ground stanchion which looked perfect until tested. The crack showed up no mistake.

So if you have any doubts I think it's money well spent. Never had any aluminium components x-rayed though. Have A65's got a habit of breaking rods?


Norton Mk3 Commando.
#718079 - 12/07/17 8:47 pm Re: Testing cranks and rods [Re: ferretjuggler]  
Joined: Mar 2006
Posts: 1,178
htown Online content
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htown  Online Content
BritBike Forum member

Joined: Mar 2006
Posts: 1,178
Magnolia, TX
Problem with A65 rods with alloy cap is the big end wears oval. Bolt the cap back on and carefully measure vertical and horizontal diameter.


1978 Bonneville T140E
1974 Trident
1970 BSA Thunderbolt
1971 Norton Commando
1972 Norton Commando
2-1974 Norton Commandos
2004 XL 1200R Sportster

Everything will be alright in the end. If its not alright, its not the end.
#718080 - 12/07/17 8:53 pm Re: Testing cranks and rods [Re: ferretjuggler]  
Joined: Aug 2015
Posts: 960
Andy Higham Online content
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Andy Higham  Online Content
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Joined: Aug 2015
Posts: 960
Bolton Lancs UK
I would not entertain used rods. A pair of new rods is cheaper than a leg out of bed


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
GM500cc sprint/LSR bike "Deofol"
Jawa 500cc grasstrack
2003 Aprilia RSV Mille "Lo Stregone"
#718098 - 12/07/17 11:40 pm Re: Testing cranks and rods [Re: Andy Higham]  
Joined: May 2013
Posts: 4,560
Allan Gill Online sleepy
Allan Gill  Online Sleepy


Joined: May 2013
Posts: 4,560
Rotherham - S. Yorkshire
Originally Posted by Andy Higham
I would not entertain used rods. A pair of new rods is cheaper than a leg out of bed


Plus 1!

I buy new aluminium rods from thunder engineering for my bikes, cost about £360-380 for a matched pair and excellent quality! The weight is the same as the 1970 on type rods so it could match your crank balance too.

I also had my crank nitrited following an oil starvation issue, polished the bad journal and it for treatment. Replaced the rod on that side too. Thunder matched the rod from their date code so the weight was uneffected.

I did polish a set of rods which were going into a friends engine, as they didn’t want to fit new units.


beerchug
#718184 - 12/08/17 11:56 pm Re: Testing cranks and rods [Re: ferretjuggler]  
Joined: Dec 2017
Posts: 9
ferretjuggler Online content
BritBike Forum member
ferretjuggler  Online Content
BritBike Forum member

Joined: Dec 2017
Posts: 9
England
Thanks for all the good advice.
It looks like I'll have to add a new pair of rods to my Christmas list.
I've found some steel capped ones made by L F Harris Ltd.
Looking at them they are T140 rods with narrower big ends.
Not sure about the effect on the balance factor
though.

Last edited by ferretjuggler; 12/09/17 12:01 am. Reason: Correction of predictive text
#718240 - 12/09/17 3:51 pm Re: Testing cranks and rods [Re: ferretjuggler]  
Joined: Aug 2001
Posts: 3,452
gavin eisler Online content
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gavin eisler  Online Content
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Joined: Aug 2001
Posts: 3,452
argyll. scotland, uk
I used T140 rods in one build, SRM bored them to suit the A65 big end size.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod

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