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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Replacing alloy idler with steel
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<blockquote data-quote="timetraveller" data-source="post: 27155" data-attributes="member: 456"><p>Remove spark plugs so that there is no compression and then remove all tappet adjusters so that there is no tendency for the engine to be turned by valve spring pressure. You might have to rotate the engine to remove some of these. Then mark both the cam wheels and the breather and magneto/distributor drive gears with a marker pen and continue these lines onto the crankcase face so that you know exactly where these gears lined up. You can then remove the ali idler and replace with the steel one. If there is now too much or too little clearance between the large idler and the half time pinion you will have to replace that. If so ensure that the new one goes in so that the teeth line up and one of the key ways lines up with the slot in the mainshaft. Nothing should move. If sod's law applies then you will find that there is no position whereby the half time pinion can simulaneously line up with the teeth and the slot in the mainshaft. If so then make the absolutely minimum rotation of the engine. It should be no more than plus or minus one and a half degrees'</p></blockquote><p></p>
[QUOTE="timetraveller, post: 27155, member: 456"] Remove spark plugs so that there is no compression and then remove all tappet adjusters so that there is no tendency for the engine to be turned by valve spring pressure. You might have to rotate the engine to remove some of these. Then mark both the cam wheels and the breather and magneto/distributor drive gears with a marker pen and continue these lines onto the crankcase face so that you know exactly where these gears lined up. You can then remove the ali idler and replace with the steel one. If there is now too much or too little clearance between the large idler and the half time pinion you will have to replace that. If so ensure that the new one goes in so that the teeth line up and one of the key ways lines up with the slot in the mainshaft. Nothing should move. If sod's law applies then you will find that there is no position whereby the half time pinion can simulaneously line up with the teeth and the slot in the mainshaft. If so then make the absolutely minimum rotation of the engine. It should be no more than plus or minus one and a half degrees' [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Replacing alloy idler with steel
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