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Al Eckstadt
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#73480 02/05/08 2:08 pm
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i some one can help me with this problem, i am switching from distributor to Lucas k1f mag on my 1962 es2. everything lines up and i just had to switch the sprocket on mag to one from a magdyno. the problem is the chain is now too long. book list 44 link chain for mag or dist. the sprockets are the same size. is there a way to shorten the chain ie masterlink/half link for this chain. What is the size chain, is there suitable alternatives? any and all suggestions would be appreciated. thank you.


1948 indian chief
1937, 1939, 1962 norton es2
1950 triumph trw
1970 triumph bonneville
1975 norton commando
1972 bmw r75/5
various projects
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#73481 02/05/08 9:04 pm
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Can you post a picture of the setup? i had a feather bed Es2 wih the dizzy but i cant remember if the chain was adjustable somehow, although being flange mounted i cant see how it could be? Mind you this was 25 years ago! I went from a fastback to the es2 that was a shock! douglas

#73482 02/06/08 1:22 pm
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i dont see how the dist could be adjustable because the housing is fixed on the chaincase. i thought that it would be a straight swap and it might be the one thing i havent checked for is chain stretch. i am going to order a new chain because they are relatively inexpensive and see if that helps at all. i will post pictures tomorrow as i wont get out to the garage again til then. thank you.


1948 indian chief
1937, 1939, 1962 norton es2
1950 triumph trw
1970 triumph bonneville
1975 norton commando
1972 bmw r75/5
various projects
#73483 02/07/08 12:50 pm
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I think the flange mount setup for the distributor and the magneto is the same and uses extra clearence in the mounting holes to allow the housing to swivel to adjust the chain. I've changed from a mag to a points housing and don't recall having to source a new chain.

#73484 02/07/08 4:07 pm
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[Linked Image] [Linked Image] [Linked Image] [Linked Image]

ordered new chain as specified by book and hopefully will fit as i am hoping that this is just a severely stretched timing chain.


1948 indian chief
1937, 1939, 1962 norton es2
1950 triumph trw
1970 triumph bonneville
1975 norton commando
1972 bmw r75/5
various projects
#73485 02/07/08 10:43 pm
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Right, first off you say the sprockets are the same size, but if the mag sprocket is off an earlier bike the sprocket will have 15 teeth whereas the dizzy bikes had 16. Not only will this make your drive chain slack, but your engine will only fire once every 32 revs. There are 16 tooth mag sprockets about but they are rarer so first job count those teeth, if its 15 tooth you need the matching cam sprocket, the one off the WD/16H will do, and I think the chain should then be 42 links.
If you look at the mag studs the lowest one should be plain 5/16, the others waisted, or if for a dizzy, smaller (1/4) on the mag side of the middle flange, that should give you enough movement on the mag. If you have 3 plain ones that could be your problem. I did this conversion myself years ago and bored the middle out of the original distributor sprocket and bolted it to a spigot turned onto the middle of an old Velocette magneto gear, I filed the bolt holes into slots which made timing adjustment dead easy.
I hope you're right and the chain is just worn out.Good Luck!


Oil is always cheaper than metal
#73486 02/08/08 9:32 pm
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Quote
Originally posted by injunmort:
i dont see how the dist could be adjustable because the housing is fixed on the chaincase.
According to the Norton maintenance Manual the timing chain is adjusted by slackening the two distributor upper mounting "Allen nuts" and then by levering or tapping the dist. so that it pivots around the lower mounting stud to adjust the chain tension.
The Manual says the timing chain should be checked first (3/16" slack at the tightest point) before setting the ignition timing.

#73487 02/09/08 4:29 am
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Yeas ago I had a '49 500T with a Lucas mag. on it. It died and in a rush I stuck the timing cover from a '60 Model 50 on it and bolted a BTH mag. from an old Velo in place of the distributor. The bolt pattern was the same. I did a pick and mix and came up with a chain and sprockets that had the right tension and away I went. I think I might still have the chain and sprockets out in the garage. There should be some adjustment on the timing cover. If not it shouldn't be too difficult to "engineer" some.


God rides a Triumph but wishes it was a Norton.

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