2 very nice examples there Malcolm
dont mind saying i knew what a yds3 was but never heard of the ym1

The 305cc YM1 bike that Yamaha produced between 1964 & 1966, (using lots of parts that were used in the YDS3), was a competitive bike against the Honda CB77 that also had a 305cc engine, (based on the 250cc CB72 Honda), that was produced from the early 60's until 1967.

Most likely simply Japanese Manufacturer competition for a certain section of the market.

Both of them good for 100+ mph (Marginally).

I can't possibly say but it involves D.I.Y. no bikes only TT and MGP I have bikes sometimes in my shed, sounds good though.

you see some of us were not born then
but i do hold a love of bikes im too young too have rode in there day

Like M78 I've loads of DIY stuff plus all our camping gear for the Manx/Classic TT. Bike -wise I have a Kawasaki er6f road machine, a Triumph Tiger Cub trials bike and two BSA B50 road racers. One of the B50's is ready to go but, sadly, there's nowhere for it to go!!! The other B50 is almost ready to go.

I have a modern Triumph Bonneville 865, 2 x Kawasaki 250 triples, 1 x 350 triple, 1 x 400 triple, 3 x 500 triples (1 of them in pieces) and 2 x 750 triples one of which is on the bench being rebuilt.

Love the matching Yams Malcolm. In my shed. There a 2017 Triumph  Tiger 1200xca. 2000 Triumph Daytona955i. 1990 Suzuki DR800S Doctor Big with a trademans sidecar.  And a 1988 DR750 Dessert Express.  Also the Mrs cbr125 and my lads Xr125.
I would post some pics but I carnt figger out how to do it.

Very nice Yamahas there Malcolm ....... in my shed/garage - my trusty Yamaha TZ350 - engine in kitchen cupboard & frame in loft, DT 125 & 175 1979, PW80, FZR1000 88, WR450F, Kawasaki ZX10R C1, KE175, Suzuki RV50 & Street Magic 50, Honda CH250 Spacy scooter......offshore IoM depot aka my sister's and mates houses KTM990SM, Honda CRM250AR, Suzuki RV125 and my late Dad's lovely Triumph 3TA Bathtub...and a loopy Kawasaki 1200cc 2-stroke Ultra 150 jetski...

kawasaki tripples
id love 1 or 2
i have my 2011 daytona and also a 1982 gpz 1100 which has been off the road far too long
the plan is 1 day the gpz will get the attention it deserves and will be sparkling once again
ive had it 30 years now so no intention of it going any where

Those yds3s Bring a few memories back I had a yds2 a great little bike wished I still had it it was a olive green and white beautiful tool.

I have a Moto Morini 3 1/2 Sport, a 250 OSSA Gripper trials bike and most of a D1 rigid frame Bantam (someone stole the engine out of it when the family was at the TT years ago...

Sadly none of them running and I lack the funds to get them going and the knowledge to do it myself...Needs a lottery win

Honda 350 K4 race bike that I restored

Yamaha TZ/RD 350 hybrid race bike that I'm restoring

Royal Enfield Continental GT535 - to go to the cafe on

Suzuki GSX-R 1000R - the latest Gixer thou is a stunning bit of kit (especially for a pensioner like me🙂)
I like classics, but modern sportsbikes are absolutely brilliant

Well let me see i have a 2001 yamaha R1 only done 11000miles erm a 1991 250 rgv Suzuki and a 1978 gs750 Suzuki in bits at the moment I'm too a pensioner and still mad about motorbiks roll on summer and the TT if it's on

Some of the fleet ... Lockdown Lovelyness

My garage is a tip, but I thought I'd show it anyway!! 
Think there's a secret 50s/60s Bobber/rocker vibe going on!!
Couldn't decide if I wanted USA or UK rock & roll!

After about 20 years of not having a bike I jumped in last year and bought a 2015 DR650 which I've been modifying and adding bling to get to adventure bike spec.  Once you get about and hour out of Brisbane there's more dirt than bitumen.  Took this picture on one of the rare muddy days - usually dust is the issue.

Getting another bike was one of the best things I've done in the last few years.  Met a bunch of local enthusiasts on Meetup and we get in an overnight ride about once a month - with a bit of a break over summer / Xmas.

I had a photo in my garage but it was such a tip I decided not to include it

Cheers

Sam

I have a 1978 S registration Honda CB 750 Supersport.