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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Main bearings
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<blockquote data-quote="SteveO" data-source="post: 113378" data-attributes="member: 3636"><p>Bill, yes I thought the oil scroll was going to fix the problem. As I said above, my engine actually lacked this part. But it's made no difference. I appreciate that I need to centralise the rods, but there seemed little point in moving on to this before I got the crank turning without banging into something! I have had a mail conversation with Davidd on here and he suggests a cheap bearing seperator, ground to fit, to start the bearing off the shaft, so that is my next purchase. My thinking now is that since I probably need to shim the bearing to get clearance anyway, I am going to have to go with whatever that takes and hope the rods line up. I have to get the drive side free turning, as that is the side that is tightened up against pulling the crank over, not the timing side. I don't like the fitting on the main much myself, it is horrible, but I'm stuck with it unless I either scrap the case for a modern replacement or undertake major machining work that I can't do myself. I do have some F1 contacts and an engineer friend who told me that TZ750 Yamahas were raced in the Island with the bearings glued in with Loctite. I dont intend to use the bike THAT hard! In the meantime here are some photos of the crank. I am starting to wonder where this build is going as every time I fix one problem another crops up; it's beginning to get me down if the truth be told...</p></blockquote><p></p>
[QUOTE="SteveO, post: 113378, member: 3636"] Bill, yes I thought the oil scroll was going to fix the problem. As I said above, my engine actually lacked this part. But it's made no difference. I appreciate that I need to centralise the rods, but there seemed little point in moving on to this before I got the crank turning without banging into something! I have had a mail conversation with Davidd on here and he suggests a cheap bearing seperator, ground to fit, to start the bearing off the shaft, so that is my next purchase. My thinking now is that since I probably need to shim the bearing to get clearance anyway, I am going to have to go with whatever that takes and hope the rods line up. I have to get the drive side free turning, as that is the side that is tightened up against pulling the crank over, not the timing side. I don't like the fitting on the main much myself, it is horrible, but I'm stuck with it unless I either scrap the case for a modern replacement or undertake major machining work that I can't do myself. I do have some F1 contacts and an engineer friend who told me that TZ750 Yamahas were raced in the Island with the bearings glued in with Loctite. I dont intend to use the bike THAT hard! In the meantime here are some photos of the crank. I am starting to wonder where this build is going as every time I fix one problem another crops up; it's beginning to get me down if the truth be told... [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Main bearings
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