Briggs and Stratton oddity (2023 Update)

[The Natural Philosopher]

Nope, definitely 3/8"

Briggs are Yankee - its all imperial

[The Natural Philosopher]

It is UNF or UNC. UNC is coarse for cast iron. UNF is the more normal.

9.5mm is a shade under 3/8"

a 3/8" AF should have fitted it like a glove. Almost certainly a 1/4" bolt diameter.

[Tim+]

Well I guess it is 3/8? after all. Just seems odd that so many of the engine bolts seem to be metric but not these ones. Live and learn.

Anyone happen to know what voltage the starter motors require?

Tim

[Mark]

normaly 12volt dont ever remember seeing a 6volt on any B&S

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[Tim+]

Cheers.

Tim

[Fred]

Bet they aren't metric either, just the one that has the same spanner for metric and non metric.

[Roger Mills]

But have you looked at the actual threads? Just because a metric spanner is a close fit to the head size doesn't necessarily mean it's a metric bolt. Metric spanners are a good enough fit on many UNF and UNC bolts.

[Funguspunt]

I got confused by this too. All the bolts are metric apart from those two which are 5/8” UNC . Had to drill mine out as previous Hodges’s had rounded the heads. Strange situation though

[Brian Gaff]

Did this news come like a bolt out of the blue? Brian

[Fredxx]

This thread is 2 years old and answered.

Perhaps take a look at:

for all the information you need.