| Also known as | E4149 |
| Diagram | Fig. 11 — CHAINCASE AND CHAINS · ref 11 |
| Subsystem | primary |
| Listed in parts books | 1964–1965 |
Chain tensioner blade
A primary chaincase chain tensioner blade, also listed under the older E4149 number.
70-4149 is a chain tensioner blade that lives in the primary chaincase, per the parts-book figure it appears under. Its job as a tensioner blade is to take up slack in the primary chain as it wears, keeping tension steady so the chain doesn't slap around inside the case.
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The catalog also lists this part under the older E4149 number, so if you're working from an earlier parts book and see that reference, it's the same physical piece. Our records show it turning up across catalog entries from 1964 to 1965, but we don't have more detail tying it to a specific model beyond that, so check it against what's actually in your chaincase before you order.
If you're replacing this, it's worth having a look at the rest of the primary chain and tensioner assembly while the case is open, since they all work together and wear tends to show up as a set.
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