| Also known as | S1925 |
| Diagram | Fig. 2 — CRANKCASE · ref 20 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1970, 1974 |
Bolt (3-3/4 in. U.H.)
A 3-3/4 in. under-head-length crankcase bolt, cataloged 1969-1974, also known by its earlier S1925 number.
This is a 3-3/4 in. bolt that shows up in the crankcase section of the parts books, listed under the older S1925 number before it was renumbered to 21-1925. The U.H. callout in the catalog tells you the length is measured under the head, which is how the shop specifies bolt length on parts like this.
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It lives with the crankcase hardware, holding the case halves or associated components together. Appearance in catalog rows spans 1969 through 1974, so it turns up across a run of engines from that period, but we don't have model-specific fitment data to hand you beyond that.
If you're replacing crankcase bolts, it's worth checking the length and thread against what's already in the case before ordering, since a mismatch here can mean trouble getting the cases to seat properly.
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