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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
lucas altette horn - contacts problem
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<blockquote data-quote="chankly bore" data-source="post: 49059" data-attributes="member: 317"><p>You need to be sure you've still got the contacts! I have known them to be melted off after excessive current or heat. You have one of the less adjustable models. Use paper gaskets under the diaphragm to achieve about .012" clearance between the magnet body and the armature, this is a bugger to check but it can be done. Then assemble. You may need to make up a gapped screwdriver to loosen the adjustment nut under the chrome nut. Make sure the points can close, and are clean as previously suggested. You should lubricate the fine adjustment threads with a bit of WD40 or similar. You may be able to feel the contact of the little plunger on the leaf spring. Back off 1/4 turn from contact then adjust for 5.5 to 6.5 amps consumption and a good tone.Best not to run 12 volts through a 6 volt horn, better to get a 12 volt one from an old car and transpose the shiny bits. You can use right-angled circlip pliers to do the locknut in an emergency.</p></blockquote><p></p>
[QUOTE="chankly bore, post: 49059, member: 317"] You need to be sure you've still got the contacts! I have known them to be melted off after excessive current or heat. You have one of the less adjustable models. Use paper gaskets under the diaphragm to achieve about .012" clearance between the magnet body and the armature, this is a bugger to check but it can be done. Then assemble. You may need to make up a gapped screwdriver to loosen the adjustment nut under the chrome nut. Make sure the points can close, and are clean as previously suggested. You should lubricate the fine adjustment threads with a bit of WD40 or similar. You may be able to feel the contact of the little plunger on the leaf spring. Back off 1/4 turn from contact then adjust for 5.5 to 6.5 amps consumption and a good tone.Best not to run 12 volts through a 6 volt horn, better to get a 12 volt one from an old car and transpose the shiny bits. You can use right-angled circlip pliers to do the locknut in an emergency. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
lucas altette horn - contacts problem
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