Briggs and Stratton Opposed Twin Q/A 's!

Post them Q & A's about your Opposed Twin here!

I can start off by asking,

What is the bolt size for the keyed output shaft? Can it be 7/16 - UNC?

None of the one I had fit.

i think so, i would go out and check mine, but its kinda storming here lol

richie thomas wrote:

i think so, i would go out and check mine, but its kinda storming here lol

Ouch, be safe!

im not worried, i love a thunder storm, but it ticked me off cause i was gonna take dixie apart and sand her down and no i cant my shed leaks so i might as well be in the rain lol

It may be 3/8" or 7/16", ( cant remember right now) but you're looking for a UNF thread, not UNC.

I bought 3/8" today as i thought it was correct, it went right through/ in. And oh is it Fine thread, I will get a new bolt tommorrow.

Exhaust is 1/4" UNC tho?
And Exhaust port center should be 3/4" Pipe threads.

Yes- exhaust is UNC.

Doc Sprocket wrote:

Yes- exhaust is UNC.

Allright thanks.

Anytime!

Anyone know the threadsize for the engines oil drain hole? I guess its Pipethreads?

Doc Sprocket wrote:

It may be 3/8" or 7/16", ( cant remember right now) but you're looking for a UNF thread, not UNC.

And it was 7/16" UNF indeed.

Yes, pipe, I believe it's 3/8's.

Oil drain is 3/8" NPT.

Doc Sprocket wrote:

Oil drain is 3/8" NPT.

Thanks Stretch and Doc

Thunder, the output shaft takes a very specialized bolt. It took me a few weeks to find one. You need a big hardware store, not just a homedepot or anything. Good luck.

BlackMountian88 wrote:

Thunder, the output shaft takes a very specialized bolt. It took me a few weeks to find one. You need a big hardware store, not just a homedepot or anything. Good luck.

Not really specialized, but yeah and it was 7/16 - UNF, that's Fine thread, since you guys operate with UNFine and UNCoarse Thread's

We have a very good store for bolts and fastener's. But they normally sell in bulk, so it cost me loads to buy only one. Thanks!

BlackMountian88 wrote:

Thunder, the output shaft takes a very specialized bolt. It took me a few weeks to find one. You need a big hardware store, not just a homedepot or anything. Good luck.

Wel... Yes and no. It's not a "specialty thread" per se- just a UNF machine thread. Dirt common in north american machinery. However, you're right insofar as that bog-box hardware stores tend not to carry UNF. When I need them, I usually hit up a proper industrial fastener store like Brafasco.