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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Grosset Electric Starter Installation
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<blockquote data-quote="greg brillus" data-source="post: 139463" data-attributes="member: 597"><p>Just an update to how this bike is going.......So I received a new version of the starter ring gear from France.........Made just the same as previous versions, but of a softer material, so the teeth are not brittle........Gave this and the chain wheel to my machinist, he machined up a ring that pressed onto the new ring gear, and machined a small shoulder on the outer rear face of the chain wheel........This is to accurately align the ring gear to the chain wheel radially. We then spot faced all the 8 x countersunk holes in the ring gear, so it now takes normal allan head cap screws and not countersunk screws. The new screws are longer and pass through the wall of the chain wheel enough that some M6 nuts can be threaded onto these screws from behind.........All assembled up with loctite and the excess threads trimmed off. A test fit of the outer primary cover showed that the chain wheel could be moved in and out about 2 to 3 mm until the heads of the nuts hit the primary cover, so plenty of room, plus the extra security of the assembly not coming loose in service. The next culprit was (in my opinion a big cause of the starting issues) the ESA, This was "Beefed up" just using the simple method of replacing the inner small springs with lengths of 4 mm "O" ring thus adding a lot more compression to the cam assembly........So the ESA still works but it now deflects from one way to the other far less than before........time will tell on this one........Several tests cranking the engine with the cover off showed the ESA movement to be far less. Originally, the ESA would ramp up fully when the starter engages, then snap back the other way once the engine fired up........this was causing a huge shock through the primary back to the starter..........I also installed a new Deka battery, fully charged, and striped the 2 Mikuni's making sure the pilot jets were cleaned out.........These block up very easily if the bike is stood for some time with nil use........probably more common in hot climates where the fuel deteriorates rather quickly........I'll take the bike for a run in the next day or so, but it cranks over very well now with no adverse noises when the starter is used.........I also went to some trouble to cure oil leaks from the starter, this was back when I got the bike, before the ring gear teeth let go..........Hopefully all good now.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 139463, member: 597"] Just an update to how this bike is going.......So I received a new version of the starter ring gear from France.........Made just the same as previous versions, but of a softer material, so the teeth are not brittle........Gave this and the chain wheel to my machinist, he machined up a ring that pressed onto the new ring gear, and machined a small shoulder on the outer rear face of the chain wheel........This is to accurately align the ring gear to the chain wheel radially. We then spot faced all the 8 x countersunk holes in the ring gear, so it now takes normal allan head cap screws and not countersunk screws. The new screws are longer and pass through the wall of the chain wheel enough that some M6 nuts can be threaded onto these screws from behind.........All assembled up with loctite and the excess threads trimmed off. A test fit of the outer primary cover showed that the chain wheel could be moved in and out about 2 to 3 mm until the heads of the nuts hit the primary cover, so plenty of room, plus the extra security of the assembly not coming loose in service. The next culprit was (in my opinion a big cause of the starting issues) the ESA, This was "Beefed up" just using the simple method of replacing the inner small springs with lengths of 4 mm "O" ring thus adding a lot more compression to the cam assembly........So the ESA still works but it now deflects from one way to the other far less than before........time will tell on this one........Several tests cranking the engine with the cover off showed the ESA movement to be far less. Originally, the ESA would ramp up fully when the starter engages, then snap back the other way once the engine fired up........this was causing a huge shock through the primary back to the starter..........I also installed a new Deka battery, fully charged, and striped the 2 Mikuni's making sure the pilot jets were cleaned out.........These block up very easily if the bike is stood for some time with nil use........probably more common in hot climates where the fuel deteriorates rather quickly........I'll take the bike for a run in the next day or so, but it cranks over very well now with no adverse noises when the starter is used.........I also went to some trouble to cure oil leaks from the starter, this was back when I got the bike, before the ring gear teeth let go..........Hopefully all good now. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Grosset Electric Starter Installation
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