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Yamaha YDS7 250
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BSAdave
London
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June 30, 2020 - 10:01 am
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Its all the fault of Bantams that lead me down this path. any way, with covid and being a key worker and my employer playing rusisan roulette with my life it has given me a different out look on life. I have not had any time off since the start of this man made virus.

in need of something to keep me sane i took a look on ebay be live it or not i was acutely looking to buy an Ambulance to convert but easily side tracked i found a Yamaha YDS7 for sale and only half a mile from my house, well when i say a bike it was lots of bits that i was assured would make a bike.

In my youth my first proper big road bike was a Yamaha RD 250 b, The YDS7 is the mother of the RD.

It was the TLS front brake that took my fancy.

Deal was done and home it come. I knew the engine was seized what i didn't know was the PO had taken an hammer to the pistons when that didn't work he tried to drill holes in them hitting the barrel.

20200508_173452.jpg

This is the better one of the two, the other side is unbelievable.

20200508_202147.jpg

Things don't get any better as i finally get the crank out.

crank.jpg

what a mess. by this stage i wish i got the ambulance.

Inside the engine cases.

20200513_171454.jpg

On the plus side the gear box was good and clean.

sp_PlupAttachments Attachments

D1 D3 D5 D7 Suzuki TS 125, Yamaha YDS7 250

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stubaker58
Sunny Felixstowe
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June 30, 2020 - 3:43 pm
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Well done Dave! Looks like you’ve got a real job on, couldn’t be in better hands.

D7/14 hybrid (4 speed with D7 crank etc.) on the road, D10 Bushman awaiting rebuilding.

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Stoo63
GLASGOW
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June 30, 2020 - 4:37 pm
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Typical yam piston - soooooo familiar 🤯

'52 D1 direct lighting plunger; '58 Square Four (project); '55 D3 Battery; '59 D1 direct lighting plunger;  '59 Tiger Cub; '60 5TA;  '76 FS1-E '97 Honda Sky SGX50.

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Blue Heeler
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June 30, 2020 - 11:19 pm
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Nasty! I can see Yam is at death`s door.... hopefully it will pull through with the help of Doctor Dave. 

Good luck.

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BSAdave
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July 2, 2020 - 9:42 am
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Thank you for your replies. It is easier to get parts for a 1949 Bantam than it is for this bike. there are plenty of spares in the USA but the postage is ridiculous, ie head light bowel £36 postage £55, i got in touch with the seller and he replied the postage is set by Ebay and he can't do any thing about it. Well he could if he but could be bothered.

There are a few parts that come up in Germany and the UK. I managed to get a pair of exhaust silencers from a buyer in the UK for a very good price.

I have been spending most of my time sourcing the parts that were missing, there is a company that make pattern parts for this bike in the UK and i must the service is brilliant.

A few more horror pictures.

20200531_195145.jpg

 

The rev counter.

more horrors coming soon.

sp_PlupAttachments Attachments

D1 D3 D5 D7 Suzuki TS 125, Yamaha YDS7 250

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N.D.James
Swansea
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July 5, 2020 - 1:32 pm
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Good luck with this one 

Ill keep watching 

 

Nathan 

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BSAdave
London
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July 6, 2020 - 10:53 am
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all the rust damage is on the left side which happens to be the side that the side stand on. I think it must have been parked up on the side stand for a very long time and water got into the airbox and the run into the engine.

20200513_124922.jpg

The airbox.

air-filter.jpg

sp_PlupAttachments Attachments

D1 D3 D5 D7 Suzuki TS 125, Yamaha YDS7 250

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BSAdave
London
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July 6, 2020 - 11:01 am
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The left barrel is complete knackered.

What im learning about these bikes is spares are very hard to find. The airbox lid , speedo etc are near impossible to find yet rev counters are easy to obtain.

Ive been lucky in finding a person in Minnoesota USA who happened to have both of these for a very good price.

20200603_113825.jpg

sp_PlupAttachments Attachments

D1 D3 D5 D7 Suzuki TS 125, Yamaha YDS7 250

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