Old Cranks?
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I just split them. Timbo or local guy puts them back together. Saves time and shipping to Timbo if a guy splits it and then finds the bad bearing did its dirty deed already. If it vibrated definitly get it balanced also. If you want it split no problem. If its good just let me know where to send it.
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There must be someone in the UK that can do this? potentially I have three cranks that could be re-used/saved. I'll dig the other one out this week and get some pics of it. I have three engines and 4 cranks, a nice new crank in my road bike, the duffer pictured here, another which I think was suffering from the same problem and the one in my race bike which has largely behaved itself so far.
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QUOTE (marshall100 @ Nov 29 2010, 02:46 PM) <{POST_SNAPBACK}>
There must be someone in the UK that can do this? potentially I have three cranks that could be re-used/saved. I'll dig the other one out this week and get some pics of it. I have three engines and 4 cranks, a nice new crank in my road bike, the duffer pictured here, another which I think was suffering from the same problem and the one in my race bike which has largely behaved itself so far.
Chris Applebee Engineering did one for me once but made a right mess of the balancing, everything on the quad shook to bits and wore away.
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Who's that then?
They need to split the crank to remove the rod and bearing. Then press it back together and bolt a suitable weight onto the crank pin of a suitable mass, the mass depends upon the 'balance factor' used and the weights of the big end of the rod and bearing (rotating mass), and also the little end, pin, piston, clips and rings (reciprocating mass).
They also need to know what rpm you want it balanced for, as a single cylinder engine balanced for one rpm is wrong at other rpms.
Would be worth asking those in the know on here what sort of balance factor you need for stock stroke, stock rod, piston etc at typical rpms we use.
They need to split the crank to remove the rod and bearing. Then press it back together and bolt a suitable weight onto the crank pin of a suitable mass, the mass depends upon the 'balance factor' used and the weights of the big end of the rod and bearing (rotating mass), and also the little end, pin, piston, clips and rings (reciprocating mass).
They also need to know what rpm you want it balanced for, as a single cylinder engine balanced for one rpm is wrong at other rpms.
Would be worth asking those in the know on here what sort of balance factor you need for stock stroke, stock rod, piston etc at typical rpms we use.