Before choosing a replacement snowmobile starter, identify whether each mounting point is a stud, an unthreaded through-hole, or a threaded hole. A description such as “two mounting points” leaves out the attachment type—and a hole diameter is not the same information as a thread specification.
What to document for each attachment type
Record each mounting feature separately rather than describing the whole mounting face simply as “bolt holes.” Use the following checklist to request or organize information; it does not supply missing dimensions for any particular starter.
| Attachment type | Information to document | What not to assume |
|---|---|---|
| Mounting stud | Number and location of studs, thread designation, and any measured projection length with its reference face identified | A stud is not an open hole, and its thread designation does not specify its projection length |
| Unthreaded through-hole | Number and location of holes, diameter of each hole, and confirmation that each is unthreaded and passes through | A hole diameter does not establish the required bolt specification |
| Threaded hole | Number and location of holes, thread designation, and any documented hole depth or usable thread depth, clearly distinguished | An opening diameter alone does not identify the thread or the permitted fastener length |
For all three types, preserve the original units and identify whether the information came from a catalog, supplier drawing, or measurement of the original part. If a dimension is unavailable, mark it as unknown rather than estimating it from a photograph.
Keep “through” and “threaded” as separate observations
“Through” describes whether a hole passes through the material; “threaded” describes its internal surface. When documenting an unthreaded through-hole, state both characteristics. For a threaded hole, record whether it is blind or through only if that detail has been established.
If the view does not reveal the hole interior, label the attachment type as unconfirmed and request a clearer view or drawing. A photograph records what is visible; it is not a scale drawing.
Catalog example: 0745-052 specifies studs, not through-holes
The supplied catalog identifies the 0745-052 starter as having two 5/16-18 mounting studs, not through-holes. It also requires the relative positions of the studs and terminal to be checked against the original unit.
For an attachment record, retain the wording “two 5/16-18 mounting studs.” Do not shorten it to “two holes” or translate the thread designation into a clearance-hole diameter. The supplied entry does not establish stud projection length, so that field remains unknown until separately confirmed.
This is an identified catalog example, not a mounting specification for other snowmobile starters or proof of complete fitment.
Separate mounting features from terminal hardware
Label the mounting face and the terminal side in your photographs. When recording a threaded feature, say whether it belongs to the mechanical mounting arrangement or the electrical terminal; an unlabeled thread size leaves that distinction unresolved.
A compact comparison record can use these fields:
- Feature ID: A, B, or C, marked on a photograph or sketch.
- Function: mounting point or electrical terminal.
- Type: stud, unthreaded through-hole, threaded hole, or unconfirmed.
- Size: the documented thread designation or measured hole diameter.
- Source: catalog entry, drawing revision, or original-part measurement.
- Open question: any missing length, depth, or attachment detail.
Keep confirmed values, conflicting descriptions, and missing information separate. This makes it easier for a supplier to answer the actual attachment question without treating an estimate as an approved specification.
Resolve the attachment description before selecting hardware
Matching the attachment type is one part of snowmobile starter motor fitment, not a complete compatibility decision. The exact machine, original reference, mounting orientation, terminal position, and other application-specific specifications still need review.
Do not use this documentation checklist to select bolt lengths, tightening torque, or substitute hardware. Those requirements belong to the applicable manufacturer’s service information and the confirmed application. Also ask separately whether mounting hardware is included: a mounting specification or illustration does not establish package contents.