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Makotosun

Built myself a BSA B31 like i had about 60 years ago & about as rough too haha.

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Built myself a BSA B31 like i had about 60 years ago & about as rough too haha. was created by RT325

Mate passed away earlier in the year & i ended up with all his BSA parts, 90% of them past their useby!!. Before i got involved a lot of parts went to the scrap merchant. But when i spied a rusty frame in shed 6 i thought 'that's my old frame' from the "60's--i'll build me a bike i thought lol. 500 cylinder had been scrapped damn it as had fins broken but that wouldnt have stopped me using it as there's a 500 head there. Never mind--350 it is--for now. Had to rack my memory as to what went where & boxes of early & late gearbox parts mixed together. First startup was where i get my kicks from--partly because everyone laughed when i mentioned building a runner. I gave up a few times as couldn't find parts for the next step--then turned out another box & BINGO--9 corroded oil pumps so organised one. Has the compulsory british oil leaks but its work in progress, albeit slow progress & no room to move in the shed. Anyway,it's not Yamaha Sorry.
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The following user(s) Liked this Post: MarkT, littlemilo, Gr8uncleal, Schu, Ht1kid, pahiker, Tinker man
11 Nov 2025 16:48 #1

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Replied by MarkT on topic Built myself a BSA B31 like i had about 60 years ago & about as rough too haha.

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1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
11 Nov 2025 19:42 #2

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Replied by Ht1kid on topic Built myself a BSA B31 like i had about 60 years ago & about as rough too haha.

Morley Congrats. 

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11 Nov 2025 22:00 #3

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Replied by pabdt on topic Built myself a BSA B31 like i had about 60 years ago & about as rough too haha.

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Great story! What was in the other sheds?
________________________________________________
1969 Yamaha CT1 175
1974 Yamaha DT125A
1974 Yamaha DT360A with SP96 Exhaust
1977 Yamaha DT250D
Next…196x-197x Yamaha something.
Last edit: 11 Nov 2025 22:15 by pabdt.
11 Nov 2025 22:14 #4

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Replied by RT325 on topic Built myself a BSA B31 like i had about 60 years ago & about as rough too haha.

Mate used to be into Microlites so have a couple of Rotax twin motors to sell for the family. Well--the aircooled "fan cooled" one sold yesterday & i had a "plan of sorts" that if i couldn't find enough good parts to build a BSA motor i'd look at fitting the air cooled rotax twin minus the drive box on the end. Mount it crossways & run a sprocket on the crank back to the clutch exactly as the BSA has. He had 9 acres, just a retirement block i guess you'd call it, & most of the sheds just had farm stuff in, Fergy tractor & implements. Ford Consul Mk11 been parked forever, lots of things now sold. BSA parts were foreign to the family & was heading to the scrap metal but i knew what "Everything" was at a glance. Where it all started for me!!.
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12 Nov 2025 00:00 #5

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Replied by Phyllo on topic Built myself a BSA B31 like i had about 60 years ago & about as rough too haha.

Wow, great job, Morley! Sounds pretty healthy and obviously shifting thru all the gears, pretty cool!
12 Nov 2025 06:57 #6

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Replied by Gr8uncleal on topic Built myself a BSA B31 like i had about 60 years ago & about as rough too haha.

Top man! 

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Cole, Millyard etc would be proud of you!

Are you going to test ride it around the pumpkin patch?! 

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12 Nov 2025 08:15 #7

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