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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman Box Again
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<blockquote data-quote="greg brillus" data-source="post: 114520" data-attributes="member: 597"><p>Sounds like you are onto it M......One issue with these boxes and even the pre war version on the series "A" machines either twins or singles........that bearing that Martyn mentions is a problem in that it often comes loose in the housing, sometimes the outer part of the cir-clip groove is actually broken away, seen this several times and the usual fix is to drill and tap 3 or 4 holes, taped 3/16 Whit or similar, and short machine screws with a washer under each to "clamp" the bearing in place, this on the outer side of the bearing housing........Now this can only happen if someone has literally bashed the clutch end of the main shaft with a hammer, for whatever reason........So the shaft is held in place by that bearing and its fit in the housing only. Perhaps what is felt to be end float on the shaft is actually the bearing loose in its housing and moving left to right. In any case, the assembly is quite fragile, and needs to be treated with a little care. I have to say, these are not one of my favorite boxes, the pre war variety can be very expensive to overhaul on account of the ware in particular to the outer kick start cover and its workings.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 114520, member: 597"] Sounds like you are onto it M......One issue with these boxes and even the pre war version on the series "A" machines either twins or singles........that bearing that Martyn mentions is a problem in that it often comes loose in the housing, sometimes the outer part of the cir-clip groove is actually broken away, seen this several times and the usual fix is to drill and tap 3 or 4 holes, taped 3/16 Whit or similar, and short machine screws with a washer under each to "clamp" the bearing in place, this on the outer side of the bearing housing........Now this can only happen if someone has literally bashed the clutch end of the main shaft with a hammer, for whatever reason........So the shaft is held in place by that bearing and its fit in the housing only. Perhaps what is felt to be end float on the shaft is actually the bearing loose in its housing and moving left to right. In any case, the assembly is quite fragile, and needs to be treated with a little care. I have to say, these are not one of my favorite boxes, the pre war variety can be very expensive to overhaul on account of the ware in particular to the outer kick start cover and its workings. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman Box Again
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