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<blockquote data-quote="Little Honda" data-source="post: 145473" data-attributes="member: 667"><p>Is there a head-clamp fitted to the frame? As felt vibrations are a product of resonances, a higher balance factor may not always help. PEI gave some good explanations on balancing and focussed on this special</p><p>problem of engine manufacturers like JAP, whose engines were fitted into many different frames, showing</p><p>a very different vibration profile (with the same engine). See "Motorcycle Engineering", p.280: "....found in the original Vincent-HRD. singles. These engines ran very smoothly in the standard spring frame with a </p><p>factor of 66 %, but the speedway versions,......, vibrated badly in a cobwebby dirt-track frame until the factor</p><p>was reduced to 61%, this not very large reduction making all difference between a machine which was </p><p>passably smooth and one which shook itself out of your hands."</p></blockquote><p></p>
[QUOTE="Little Honda, post: 145473, member: 667"] Is there a head-clamp fitted to the frame? As felt vibrations are a product of resonances, a higher balance factor may not always help. PEI gave some good explanations on balancing and focussed on this special problem of engine manufacturers like JAP, whose engines were fitted into many different frames, showing a very different vibration profile (with the same engine). See "Motorcycle Engineering", p.280: "....found in the original Vincent-HRD. singles. These engines ran very smoothly in the standard spring frame with a factor of 66 %, but the speedway versions,......, vibrated badly in a cobwebby dirt-track frame until the factor was reduced to 61%, this not very large reduction making all difference between a machine which was passably smooth and one which shook itself out of your hands." [/QUOTE]
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