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JZ05220r wrote: ↑11:45 am Oct 12 2023 Was just doing a tune up on a 18 hp Briggs and Stratton V twin yesterday. The oil drain bolt was very similar looking to the ones on our cylinders. I doubt it will work but might be worth checking.

Chuck78 wrote: ↑04:05 pm Oct 20 2023

JZ05220r wrote: ↑11:45 am Oct 12 2023 Was just doing a tune up on a 18 hp Briggs and Stratton V twin yesterday. The oil drain bolt was very similar looking to the ones on our cylinders. I doubt it will work but might be worth checking.

So this Amazon link for a Briggs & Stratton 3/8" BSP plug 10-pack is the one we need?

Did you have to buy a 10-pack? Care to sell a few of those for nearly what you paid for all 10, if so?

Kawibunga wrote: ↑05:33 pm Oct 11 2023

It really does look to me like a 3/8" BPST thread, a few more measurements will confirm.

On the weekend I installed the plugs I ordered off amazon. These plugs were slightly longer, seemed to be the identical thread on initial measurement (but still confirming that 100%) with it being longer. I got it to tighten up way nicer while threading in. I also used good PTFE tape instead, felt really nice threading in........... and bingo, got a good seal, no leaks at temp!

Here's the new plug vs original, you can see it's a wee bit taller

PXL_20231008_162956388.jpg

Here it's installed, nice an tight (not over tight) and sitting slightly proud. Threaded in nice. After the fact I will now take a few more measurements and report back. But these worked great. Here's what I ordered.......
PXL_20231008_163006433.MP.jpg


They call them both NPT and BSSP which is obviously wrong, you can't be both, NPT is slightly larger OD and 18 TPI while BPST 19 TPI and slightly smaller OD.......... it still makes no sense to me that it's not a metric thread, but that's what I've found out so far. More to come once I take some final measurements........

Kawibunga wrote: ↑11:53 am Oct 21 2023 Yeah, I have no idea of those Briggs & Stratton JZ0522r suggested would work, might be just regular NPT, but mine definitely did and I do have spares. 3/8 BSPT 19TPI as stated. Now for shipping them out, got no issues sticking some in the mail for ya Chuck78, just have no idea the postage from here in Canada to where you are in the US........... but yeah, I don't need 9 spares on my shelf! :)

KDXGarage wrote: ↑09:14 pm Oct 23 2023 Hi. PMs are just for supporting members. You may want to type out your e-mail address in words, as the internet bots can harvest it and start spamming you.

Kawibunga wrote: ↑09:00 am Oct 24 2023

KDXGarage wrote: ↑09:14 pm Oct 23 2023 Hi. PMs are just for supporting members. You may want to type out your e-mail address in words, as the internet bots can harvest it and start spamming you.

Ahhhh, good to know KDXGarage - no problem supporting. Can it be a one time donation or does it have to be a regular monthly or yearly donation?

Tyl3r wrote: ↑02:04 pm Jan 01 2024 RE:CONFIRMED - I did not have a plug to measure and compare when I originally did this, but thanks to Kawibunga for the detective work and comparison to an original part, the correct thread spec for the plug is 3/8" BSPT (update 1/1/24)

CONFIRMED! The thread size for the coolant plug on the underside of the cylinder is most certainly M16x1.5. I tried a 3/8" NPT and it would start into the hole but stop. Here is a link to a plug if you need it, got mine from Belmetric, saw that Fastenal also sells them: https://belmetric.com/stainless-taper-m ... P16X1.5TSS