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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
F106 Dimensions
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<blockquote data-quote="davidd" data-source="post: 154906" data-attributes="member: 1177"><p>Howard,</p><p></p><p>The Factory used DTD 424 for the material of the original. I found it difficult to machine an F106, which I cast, to fit my BAR gearbox because there is no obvious reference mark on the casting. Thus, it is difficult to start by machining one dimension. I had to machine a bit on the timing side and then do the same on the drive side. Then look at it and see if the machining looked even with the casting. </p><p></p><p>I used a spare F106 to put on the mill and measure in order to get the dimensions straight. I was not able to get the 1/2" bolt holes in exactly the same place despite careful planning. I should have mounted it on its side on the mill and used the DRO to place the 1/2' holes. No harm done as the special F106 would not be interchangeable with the original, because I was using a different gearbox. That would probably not work well for you.</p><p></p><p>Additionally, you have to figure out where the shrinkage is on the casting you have. I worked from the bottom up and cast the top mount to be very tall. This allowed me to compensate for the shrinkage. It was also tall enough to raise up the back of the UFM and steepen the rake, which worked out quite well.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 154906, member: 1177"] Howard, The Factory used DTD 424 for the material of the original. I found it difficult to machine an F106, which I cast, to fit my BAR gearbox because there is no obvious reference mark on the casting. Thus, it is difficult to start by machining one dimension. I had to machine a bit on the timing side and then do the same on the drive side. Then look at it and see if the machining looked even with the casting. I used a spare F106 to put on the mill and measure in order to get the dimensions straight. I was not able to get the 1/2" bolt holes in exactly the same place despite careful planning. I should have mounted it on its side on the mill and used the DRO to place the 1/2' holes. No harm done as the special F106 would not be interchangeable with the original, because I was using a different gearbox. That would probably not work well for you. Additionally, you have to figure out where the shrinkage is on the casting you have. I worked from the bottom up and cast the top mount to be very tall. This allowed me to compensate for the shrinkage. It was also tall enough to raise up the back of the UFM and steepen the rake, which worked out quite well. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
F106 Dimensions
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