N15CS primary cover

tribonnie

tribonnie

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Hello I am looking for a outer primary cover for N15CS. So ….. when and why as the smaller outer bulge on the larger front bulge which covers the alternator introduced. I have seen a few and all seem to have extra clearance for the alternator nut on the inside of the cover but some have the extra bulge on the outside. Are they interchangeable. Cast on my inner is number 025017L. Thanks richard
 
tribonnie said:
Hello I am looking for a outer primary cover for N15CS. So ….. when and why as the smaller outer bulge on the larger front bulge which covers the alternator introduced. I have seen a few and all seem to have extra clearance for the alternator nut on the inside of the cover but some have the extra bulge on the outside. Are they interchangeable. Cast on my inner is number 025017L. Thanks richard
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I believe I have what you're looking for. I'll snap a photo later.
 
tribonnie said:
Hello I am looking for a outer primary cover for N15CS. So ….. when and why as the smaller outer bulge on the larger front bulge which covers the alternator introduced. I have seen a few and all seem to have extra clearance for the alternator nut on the inside of the cover but some have the extra bulge on the outside. Are they interchangeable. Cast on my inner is number 025017L. Thanks richard
Click to expand...
Outer primary covers with the outer bulge are for the N15CS and G15 series. Covers without are for the Matchless G12. Covers are not interchangeable, otherwise AMC wouldn't have made the later ones. The bulge was introduced due to the greater width of the Norton crankshaft vs. width of the AMC twin crankshaft.

G15/N15 primary covers are frequently advertised on Fleebay, some in rather poor condition. It pays to observe condition of the highly stressed primary chain. Ensure correct oil level, use a quality chain, and replace the chain at prescribed intervals. If the chain snaps, your primary covers will probably get smashed.

- Knut
 
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mdt-son said:
Outer primary covers with the outer bulge are for the N15CS and G15 series. Covers without are for the Matchless G12. Covers are not interchangeable, otherwise AMC wouldn't have made the later ones. The bulge was introduced due to the greater width of the Norton crankshaft vs. width of the AMC twin crankshaft.

G15/N15 primary covers are frequently advertised on Fleebay, some in rather poor condition. It pays to observe condition of the highly stressed primary chain. Ensure correct oil level, use a quality chain, and replace the chain at prescribed intervals. If the chain snaps, your primary covers will probably get smashed.

- Knut
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Thanks for your reply
 
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