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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
No Speedo
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<blockquote data-quote="powella" data-source="post: 177432" data-attributes="member: 1609"><p>If you need one of these VERY EXPENSIVE instruments and like an engineering challenge then read on.If not hit the delete button..The Vin uses a L433 ( or S603 ) speedometer and can be in excess of £300 to buy. Both instruments turn at 1600 revolutions per mile.</p><p>Indian made EXACT copy ( have handled one and they are well made ) and DO FIT. The copy turns at 1350 revolutions per mile and is £30 .YES JUST £ 30 GDP.</p><p>To use the copy it needs to turn faster.</p><p>To do this there are three ways 1 Send it away for the internals to be changed BUT the repairer / restorers do not like this since it involves changing a lot of gears.</p><p> 2 Change the drive gear ratio in the front wheel OR</p><p> 3 Change the gear ratio in the speedo drive gearbox on the front brake plate.</p><p>Consider option 3 The gear ratio as we know is 1 and a half to 1 using a 9 tooth Driver ( driven by the speedo ring on the hub ) and a 12 tooth Driven.</p><p>These are " Crossed Axis Helical Cut Gears" and can be found in the HPC Gears ,Derbyshire ,U.K. catalog using the internet.</p><p>SO someone who is good at sums can work out the Quadratic equasion 1600=1.5 and 1350= x and choose two suitable cogs using the x ratio.</p><p>From a autojumble / swapmeet obtain a Speedo Drive gearbox ( PR32 ) from any machine .With the internals knocked out, remachine the shafts , fit your new ratio gears and job is done.</p><p>The new gears need only to be Nylon ( Delrin ) since they only driving the speedometer Cable - the instrument takes very little torque .</p><p>Done one and is a mornings work BUT buying a L433 is easier!!!</p></blockquote><p></p>
[QUOTE="powella, post: 177432, member: 1609"] If you need one of these VERY EXPENSIVE instruments and like an engineering challenge then read on.If not hit the delete button..The Vin uses a L433 ( or S603 ) speedometer and can be in excess of £300 to buy. Both instruments turn at 1600 revolutions per mile. Indian made EXACT copy ( have handled one and they are well made ) and DO FIT. The copy turns at 1350 revolutions per mile and is £30 .YES JUST £ 30 GDP. To use the copy it needs to turn faster. To do this there are three ways 1 Send it away for the internals to be changed BUT the repairer / restorers do not like this since it involves changing a lot of gears. 2 Change the drive gear ratio in the front wheel OR 3 Change the gear ratio in the speedo drive gearbox on the front brake plate. Consider option 3 The gear ratio as we know is 1 and a half to 1 using a 9 tooth Driver ( driven by the speedo ring on the hub ) and a 12 tooth Driven. These are " Crossed Axis Helical Cut Gears" and can be found in the HPC Gears ,Derbyshire ,U.K. catalog using the internet. SO someone who is good at sums can work out the Quadratic equasion 1600=1.5 and 1350= x and choose two suitable cogs using the x ratio. From a autojumble / swapmeet obtain a Speedo Drive gearbox ( PR32 ) from any machine .With the internals knocked out, remachine the shafts , fit your new ratio gears and job is done. The new gears need only to be Nylon ( Delrin ) since they only driving the speedometer Cable - the instrument takes very little torque . Done one and is a mornings work BUT buying a L433 is easier!!! [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
No Speedo
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