BSA 350 cc Model L engine circa 1930 strip & rebuild 15 Exhaust port opened, valve guides discussed.

Turning my attention to the cylinder head, those worn valve guides needed replacing and when the owner originally asked about re opening a blanked off exhaust port - originally this was a 'Twin port' head - I suggested it might be tricky and best left alone. However, I decided to have a go after all, it wasn't too easy by any stretch, but it turned out ok in the end!

[@norsehall309]

G'day Paul, thanks for all the videos your making on this 1930s BSA motor it's very entertaining, had a shocking discovery today l was changing the oil on my BSA Super Rocket and pulled the strainer off and a nut and washer went clunk in the oil pan, both from the conrod, last time l buy a fully restored motorcycle from anyone, another engine rebuild and l hope no damage, cheers mate, Neil 🤠.

[@leslieaustin151]

Ooo-Err, that sounds bad. I hope you get the engine back to operating without too much trouble, but it sounds like a complete strip anyway.. Have you another bike to ride in the mean-time? Best of luck with it! Les in UK

[@norsehall309]

@@leslieaustin151 thanks for your comment, yes l have more bikes, had just finished a rebuild on another of my bikes and thought 🤔 that would be it for a while, but that's life, looks like the wife's lost me too the shed of a while more, cheers mate, look yourself.

[@paulhenshaw4514]

Wow - nasty, sorry to learn that, Neil.

[@leslieaustin151]

@@norsehall309 haha! The shed (well, garage) is where I almost live these days! Take care with that strip-down then. Les

[@norsehall309]

@@paulhenshaw4514 hi Paul, pulled the top end down too case's pistons off and no movement on conrods up or down or sideways, primary side then timing side next, l will sleep better after l have done the work, thanks for the response, I'll let you know what l find, cheers mate, Neil 🤠.

[@leslieaustin151]

Nice work Paul, and thanks for the valve-guide tip.

[@gordonsuddery4635]

Sounds like a good job to me & back to being a twin Port looking forward to seeing the finished engine. My best wishes to you from the Philippines 🛺❤️👍😉😀😁🏁🏍️🛺🐑🇵🇭🏴󠁧󠁢󠁷󠁬󠁳󠁿

[@paulhenshaw4514]

Thanks 👍

[@timothylong1857]

Great job paul nice to see it back to being a twin port 👍

[@paulhenshaw4514]

Thanks Tim 👍

[@keithchessun5085]

I look forward to seeing the complete bike when the owner brings it in for final fettling.👍

[@shug831]

Excellent work, great to see a classic engine come back to life. 😀

[@stevec-b6214]

Nice to see you enjoying the build, gonna be a beauty, can`t wait.

[@paulhenshaw4514]

Thanks 👍

[@williamnethercott4364]

I hadn't thought of anybody blanking off one port of a twin port before. Hopefully, it's a rare occurrence!

[@paulhenshaw4514]

It is fairly common, especially on Panthers. I think it was to save money on replacement exhausts and there are those who claim it also increases power a little.

[@williamnethercott4364]

@@paulhenshaw4514 I suppose that makes sense.

[@brockett]

Great ideas and great work. Was the twin exhaust port just a fashion or was there a purpose to it? Improved scavenging maybe? I hope an exhaust header can be sourced. I've seen slopers in museums and such but never heard one running.

[@paulhenshaw4514]

Twin ports were presumed to boost power for a while, but they didn't as it later transpired. Also, I suppose they just made a machine look more 'sporty'.

[@adammedyna2365]

Mhm it looks like somebody tried to increase performance of this engine blocking one exhaust port. It's very interesting engine, too bad You don't have a complete bike in your shop and can't ride it.

[@piearm1271]

I sometimes wonder what it’s like to be multi talented. Can you tell us?

[@paulhenshaw4514]

Thanks, but there are lots of things I can't do, believe me!

[@neilmcintosh1200]

That sounds a bit rough on the back pack.