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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Repairing crankcases and counter bore machining
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<blockquote data-quote="davidd" data-source="post: 35438" data-attributes="member: 1177"><p>I would not say that the cases are easily repaired, but in the hands of an excellent weldor they should not be a problem. He will also make the decision about material. Depending upon where the repair is, the cases may need machining in various areas to couteract any warping. Give him the case covers and screws so he can protect the surfaces and minimize warpage.</p><p></p><p>If you have to machine any surfaces after the welding, bring the new cylinders to the machinest for fitting. I am of the shcool that says the cylinder should slip in easily with no clamping effect from the cases. If the case clamps the cylinder to tightly, it will change the bore of the cylinder slightly, which is not good. There are probably other opinions on this issue which you will hear.</p><p></p><p>The 5 speed is nice, although I prefer four, but new gearboxes need a lot of fettling. You might want to try fitting the box the minute you get the cases back to see if there are any issues. There usually are. New parts are generally the way to go as the used ones often are worn enough to cause problems.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 35438, member: 1177"] I would not say that the cases are easily repaired, but in the hands of an excellent weldor they should not be a problem. He will also make the decision about material. Depending upon where the repair is, the cases may need machining in various areas to couteract any warping. Give him the case covers and screws so he can protect the surfaces and minimize warpage. If you have to machine any surfaces after the welding, bring the new cylinders to the machinest for fitting. I am of the shcool that says the cylinder should slip in easily with no clamping effect from the cases. If the case clamps the cylinder to tightly, it will change the bore of the cylinder slightly, which is not good. There are probably other opinions on this issue which you will hear. The 5 speed is nice, although I prefer four, but new gearboxes need a lot of fettling. You might want to try fitting the box the minute you get the cases back to see if there are any issues. There usually are. New parts are generally the way to go as the used ones often are worn enough to cause problems. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Repairing crankcases and counter bore machining
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