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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Crank Case Inspection
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<blockquote data-quote="Pushrod Twin" data-source="post: 69327" data-attributes="member: 340"><p>I am a fan of splines, I had bad experiences with R series BMW's with tapers on gear box out puts. They dont stand the shock of bump starts! Splines shouldn't wear if they are kept tight on the shaft. </p><p>My cases were cut differently to yours, obviously, & I was able to mill them flat. I see yours have the rear top & bottom of the primary area cut out. The rear case casting I have may be the answer to your desire to weld on the inner primary edge. I am off to the NZ Section VOC rally tomorrow, bags are packed, will gas the Guzzi on the way home from work after lunch and off ! I will take pics for you next week when I get back.</p><p>That little alternator ran the lights the night we started it & the lights didnt dim at idle so we figured it was keeping up. A Kubota should do the same.</p><p>90x90 does sound attractive, where did you buy the barrels & slugs? Are they nigusil plated or iron linered? I have a pair of cut cases labeled HRD like yours, late '48, #1398, but they are a low mileage, only raced for 1 season, matched pair. They are also machined up, 90% ready to be built, same as the pair in this article.</p><p>If you are an experienced welder, I am sure you dont need me to remind you to preheat the cases before welding & keep them hot all through during the process. It makes a huge difference to shrinkage & distortion.</p><p>Are you considering electric start? I am keen to fit something to the B cases, but havent worked out how yet.</p></blockquote><p></p>
[QUOTE="Pushrod Twin, post: 69327, member: 340"] I am a fan of splines, I had bad experiences with R series BMW's with tapers on gear box out puts. They dont stand the shock of bump starts! Splines shouldn't wear if they are kept tight on the shaft. My cases were cut differently to yours, obviously, & I was able to mill them flat. I see yours have the rear top & bottom of the primary area cut out. The rear case casting I have may be the answer to your desire to weld on the inner primary edge. I am off to the NZ Section VOC rally tomorrow, bags are packed, will gas the Guzzi on the way home from work after lunch and off ! I will take pics for you next week when I get back. That little alternator ran the lights the night we started it & the lights didnt dim at idle so we figured it was keeping up. A Kubota should do the same. 90x90 does sound attractive, where did you buy the barrels & slugs? Are they nigusil plated or iron linered? I have a pair of cut cases labeled HRD like yours, late '48, #1398, but they are a low mileage, only raced for 1 season, matched pair. They are also machined up, 90% ready to be built, same as the pair in this article. If you are an experienced welder, I am sure you dont need me to remind you to preheat the cases before welding & keep them hot all through during the process. It makes a huge difference to shrinkage & distortion. Are you considering electric start? I am keen to fit something to the B cases, but havent worked out how yet. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Crank Case Inspection
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