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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
engine to frame alignment
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<blockquote data-quote="tractorman414" data-source="post: 21059" data-attributes="member: 244"><p>thank you gentleman, not sure where monkeypanks gets his 9mm offset from and we don't find page 6 of the rider handbook conclusive. Mostyn has provided details of the checking proceedure he has undertaken to date, which may be of interest to you:-</p><p></p><p>Bernard </p><p>Your query has certainly caused a flutter in the pidgeon loft.</p><p>The sequence of events is as follows, the machine is up on a rigid</p><p>surface with both wheels removed. 1/2" diameter bright steel bars put</p><p>in place of the rear fork pivot, the rear wheel spindle and the front</p><p>wheel spindle. That in the rear wheel position is pulled against the</p><p>ends of the fork slot and held there (after the chain adjusters were</p><p>backed right off)An engineer's level was then use to level the fork</p><p>pivot (using screw jacks under the machine)in the belief that this area</p><p>was the least likely to suffer any wear or accident damage. The distanc</p><p>between the fork spindle and the rear wheel spindle was checked and</p><p>found to be constant for both sides. The level was applied to the BMS</p><p>bar in the rear wheel spindle position and found to be level, i.e. there</p><p>was no twist in the R F M .Distances between the fork pivot and the BMS</p><p>bar in the front forks were equalised on both sides as a way of</p><p>cetralising the front forks. The level was applied and the reading</p><p>reasonably consistant with the other readings.Then a catenary wire (a</p><p>length of 0.8 mm TIG welding wire which is pretty much as hard as piano</p><p>wire) was set up and aligned with the engine casing joint to establish a</p><p>datum, a square was then applied to the bars which had been put in the</p><p>place of the front and rear wheel spindles and the position of the</p><p>catenery wire transferred to the individual spindles. It was found that</p><p>the notional datum line struckthe front spindle on the centre of that</p><p>spindle and was about 1/2" offset to the nearside at the rear spindle.</p><p>On the advice of our club Chairman Chris Kaye I checked the sprocket</p><p>alignment by applying a square and straight edge to transfer the offset</p><p>of the outer face of the gearbox sprocket to the rear fork blade this</p><p>turned out to be 11/8" the distance from the face of the rear wheel</p><p>sprocket to the hub boss was found to be 11/8" (OK there then) I am</p><p>drawn to the conclusion that the error is in the front forks/UFM area</p><p>but knowing the value of the offset (if any) would be comforting I</p><p>anticipate having to examine the fork links and perhaps making up an</p><p>arbour to locate in the steering head bearings and drop down to my datum</p><p>line. Can't think of anything else at the moment!</p><p></p><p>Regards Mostyn</p></blockquote><p></p>
[QUOTE="tractorman414, post: 21059, member: 244"] thank you gentleman, not sure where monkeypanks gets his 9mm offset from and we don't find page 6 of the rider handbook conclusive. Mostyn has provided details of the checking proceedure he has undertaken to date, which may be of interest to you:- Bernard Your query has certainly caused a flutter in the pidgeon loft. The sequence of events is as follows, the machine is up on a rigid surface with both wheels removed. 1/2" diameter bright steel bars put in place of the rear fork pivot, the rear wheel spindle and the front wheel spindle. That in the rear wheel position is pulled against the ends of the fork slot and held there (after the chain adjusters were backed right off)An engineer's level was then use to level the fork pivot (using screw jacks under the machine)in the belief that this area was the least likely to suffer any wear or accident damage. The distanc between the fork spindle and the rear wheel spindle was checked and found to be constant for both sides. The level was applied to the BMS bar in the rear wheel spindle position and found to be level, i.e. there was no twist in the R F M .Distances between the fork pivot and the BMS bar in the front forks were equalised on both sides as a way of cetralising the front forks. The level was applied and the reading reasonably consistant with the other readings.Then a catenary wire (a length of 0.8 mm TIG welding wire which is pretty much as hard as piano wire) was set up and aligned with the engine casing joint to establish a datum, a square was then applied to the bars which had been put in the place of the front and rear wheel spindles and the position of the catenery wire transferred to the individual spindles. It was found that the notional datum line struckthe front spindle on the centre of that spindle and was about 1/2" offset to the nearside at the rear spindle. On the advice of our club Chairman Chris Kaye I checked the sprocket alignment by applying a square and straight edge to transfer the offset of the outer face of the gearbox sprocket to the rear fork blade this turned out to be 11/8" the distance from the face of the rear wheel sprocket to the hub boss was found to be 11/8" (OK there then) I am drawn to the conclusion that the error is in the front forks/UFM area but knowing the value of the offset (if any) would be comforting I anticipate having to examine the fork links and perhaps making up an arbour to locate in the steering head bearings and drop down to my datum line. Can't think of anything else at the moment! Regards Mostyn [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
engine to frame alignment
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