| Also known as | 74-13393 |
| Listed in parts books | Not catalogued by year yet |
PISTONS NORTON850.020 JCC TAIWAN
A .020 in. overbore piston for the Norton 850 twin, cross-referenced to part number 74-13393.
This is a piston for the Norton 850 twin, listed at .020 in. over standard bore. It's not a Triumph part - the catalog description names it plainly as a Norton 850 piston, sourced through JCC in Taiwan, and it carries an alternate part number of 74-13393 for anyone cross-checking against an older parts book.
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We don't have more detail on this one beyond the basic listing, so if you're rebuilding a Norton 850 top end, call the shop and we'll confirm bore size and ring fitment against your engine before you order.
Pistons are sold to match a specific overbore, so make sure .020 in. over is what your cylinders were actually bored to before ordering this one.
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