Extra home workshop time

Need help finding information or parts for that old machine in your shed? Someone in here will know!

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David Lahey
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Re: Extra home workshop time

Postby David Lahey » Mon Mar 30, 2020 1:06 pm

I've just spent an hour or so reshaping this genuine :yamaha DT175 swingarm protector so it fits the :yamaha TY250D swingarm. I used an abrasive mounted stone in a high speed pistol drill. Very fiddly work.
The correct :yamaha part is no longer available.
Does anyone do this a different way?
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Re: Extra home workshop time

Postby Bully fanatic » Mon Mar 30, 2020 9:20 pm

Well David I just mark some lines where I need it to be trimmed to and give it to my pet rat. He does a fine job every time! :twisted: :P



David Lahey
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Re: Extra home workshop time

Postby David Lahey » Mon Mar 30, 2020 9:48 pm

Bully fanatic wrote:Well David I just mark some lines where I need it to be trimmed to and give it to my pet rat. He does a fine job every time! :twisted: :P

Is it your place that the rat sausages come from? :shock:


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Re: Extra home workshop time

Postby Bully fanatic » Tue Mar 31, 2020 8:48 pm

Of course!



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Re: Extra home workshop time

Postby David Lahey » Sat Apr 04, 2020 9:44 am

Well this working from home thing hasn't meant much more workshop time yet but it's the weekend again so here we go.
Late last year I had a crash on my Majesty in the final section of a trial up at Seeonee Park. I didn't think much about damage but I did notice that the plastic sidecover would need repainting to look good again and there was some paint missing off the swingarm.
Late January I looked at the bike from behind for some reason and finally noticed that one of the shocks was quite bent.
I then thought OK I'll have a go at straightening it so pulled it apart.
It is a Falcon Classic Trial shock and only about 6 months old so it's got a neat groove in the cover(dust seal holder) so it's really easy to get the cover off now. My oldest Falcons don't have this groove.
Close looking at the shaft revealed a dent, so straightening the shaft was not going to make it a goer. It's made of 12mm chromed rod and a friend has some of this that I could use to make a new one on the lathe but I decided to try and buy a new shaft.
Well buying the shaft turned out to be very easy from the same place I bought the shocks and they said to replace the oil seal, dust seal and the guide bush at the same time and bingo a week or so later it all arrived in the mail.
For someone who only owns old motorbikes, it's great for a change to be able to buy newly-made genuine replacement parts.
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Re: Extra home workshop time

Postby David Lahey » Sat Apr 04, 2020 10:02 am

The :yamaha TY250A fuel tank de-rusting is complete now and the tank has been protected internally by coating it with WD40 and then drying it out using an electric frying pan.
I then put the tank back on the bike for some photos for a local Historical MCC show. It was going to be a normal bike show but due to corona it's now a going to be virtual bike show.
In case you were thinking wow that's a fairly ratty-looking bike for a motorbike show, there was a category for Barn Finds and this bike sure fits that bill. It has amazing patina.
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Re: Extra home workshop time

Postby David Lahey » Sat Apr 04, 2020 7:02 pm

I finally got back to the shock with the bent shaft this afternoon and dug out the shock shaft clamp that I remembered was in the shed somewhere.
Those aluminium clamp blocks are something I bought for working on my KONI shocks in 1976. From memory KONIs have a shaft that is an odd size. I'll soon find out how well they fit the 12mm shafts.
I'll probably need to warm up the mounting eye on this to free it up because the thread will have been loctited. Wouldn't want that coming loose while you were riding.
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Re: Extra home workshop time

Postby David Lahey » Sun Apr 05, 2020 11:14 am

Two nice straight shocks again ready for a test ride when the day cools off.
Yes the end fitting did need to be heated up to soften the loctite.
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Re: Extra home workshop time

Postby Bully fanatic » Sun Apr 05, 2020 2:41 pm

It is great that you can get the parts to fix things like that bent shaft. Makes thing much easier. Much better that trying to straighten the shaft without being able to pull it apart like we had to do years ago!



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Re: Extra home workshop time

Postby David Lahey » Sun Apr 05, 2020 3:42 pm

Bully fanatic wrote:It is great that you can get the parts to fix things like that bent shaft. Makes thing much easier. Much better that trying to straighten the shaft without being able to pull it apart like we had to do years ago!

I can remember seeing people trying different spots on different bike trailers looking for somewhere to get a purchase on their bent shock so they could really lean on it. Also seen the percussion technique using a rock in one hand and a big rock as an anvil.
I watched Jeff Gough try for a few minutes to straighten a bent shock on his KT250 (using a trailer) then just leave the bent one off and ride it with only one shock. From what I remember he still won the trial that day. It was exciting to watch the swingarm twisting all over the place while he rode over rocks and it didn't bend. I remember thinking wow those KTs are pretty tough bikes and I still think the same.
Lots of shocks had really skinny shafts back then so bending them was commonplace. Gas Girlings, the Betors on Sherpa Ts and TY Yamaha shocks were so flimsy


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