
Is This Crank Useable - Will It Need A Re-grind?
#1
Posted 30 March 2008 - 10:26 PM
http://cgi.ebay.co.u...em=180227761442
Sorry, cant get the pictures to save on their own
#2
Posted 30 March 2008 - 10:31 PM
Does this crank look useable and do you think it will need a regrind? Thinking of buying it as the seller has offered it to me at a good price
http://cgi.ebay.co.u...em=180227761442
Sorry, cant get the pictures to save on their own
cant really tell from a pic you need to get a micrometer on the crank and see if they are all the same. I haven't long had a crank reground . to look at it you would of said it was fine but the micrometer said different so reground it was.
#3
Posted 30 March 2008 - 10:32 PM
you really need the mains and big ends measuring with a micrometer.
what bearings is it using atm? deffo consider the condition of that end tho......maybe scrap!
#4
Posted 30 March 2008 - 10:34 PM
#5
Posted 30 March 2008 - 10:34 PM
#6
Posted 30 March 2008 - 10:54 PM
I can see what looks like major wear on number one big end and the taper looks shot. It would look as if the primary gear has overheated probibly due to a sintered clutch plate being used on an ultralight flywheel. Not to mention 'race car' 1100 miles which is two seasons at high rpm and pretty much considered the same as 100,000 miles on a standard road going engine.
Add to it if it is indeed a cooper S crank and the EN40B veriety, its so old it will most likely be on maximum regrind.
Too many variables for too much money
Anybody who hands over in the region of £300 without physicaly looking at it and measuring the wear, is asking for trouble.
What is it that has attracted you to this crank? Cooper S? The Price?
You are awae that you can get a brand new 1275 crank with a full set of bearings for £160?
#7
Posted 31 March 2008 - 07:14 AM
#8
Posted 31 March 2008 - 07:20 AM
#9
Posted 31 March 2008 - 07:23 AM
The ad is a bit ambiguous, but I was under the impression that if if you wanted to get 1460 from a 73.5 bore (1380 on standard stroke crank) you don't use the S crank. You do use S rods but you offset grind a regular 1275 crank, which has the larger big end journals down to S size.
Apart from that, there looks to be allot of damage to the taper of the crank and the mains don't look to healthy. It could do with a proper clean and a visit to someone with the correct measuring tools.
I wouldn't touch it with a barge pole.
#10
Posted 31 March 2008 - 07:34 AM

Close e-bay and walk slowly away from the computer.
#11
Posted 31 March 2008 - 09:46 AM
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