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Author Topic: 1981 Yamaha SR250 Cafe Racer  (Read 178019 times)

Offline Deviant1

  • Posts: 1874
Re: 1981 Yamaha SR250 Cafe Racer
« Reply #240 on: Mar 13, 2010, 09:40:31 »
Just went through this thread and I love this build! Nice work dude. I love the seat and I agree that the way to go is black below the line, thereby keeping the nice straight line from tank to tail. The gold logo on the red tank is going to be sweet as well. Great job man. I can't wait to see the final product here. This bike ought to be a lot of fun to throw around corners!
'That's the VJMC. They don't like us... because we cut shit up." -Tim @ Barber 2010

Offline lunar_c

  • Posts: 122
Re: 1981 Yamaha SR250 Cafe Racer
« Reply #241 on: Mar 13, 2010, 09:57:09 »
I had an idea for the underseat area. I had previously made up a tray and battery box to house all the electrics out of folded aluminium sheet. This was fine and nice and light, but it dropped down below the curves of the frame's subframe and I didn't like that.
Then I thought .. maybe I could make one from fiberglass, in one piece .. that followed the curves of the frame, so from the side, it was all but invisible .. so I took some cardboard and traced the lines of the frame onto it .. cut it out, and stuck it to a bottom piece (which I scored with a stanley knife so it would curve nicely) and made a tray .. shaped a bit like a sleigh!



I test fitted this, and it fit nicely and will have enough room for the relays, fuse box and battery. I will build a divider to keep the battery seperate (in case of leaks) and I might be able to squeeze in a couple of spanners and a screw driver behind it.



Viewed from the side, it's all but invisible as the bottom of the box now follows the lines of the frame.



Jingle bells.. Ahem.



I then covered the cardboard in clear selotape so the fiberglass wouldn't stick to it, and layed it up with resin and glass.



Released from the mould and ready for cleaning up. It turned out really well .. except the bottom didn't release so well, so I'll have to sand the cardboard off. No big deal, just a bit more time consuming.

If you can't explain something to your grandmother, you don't understand it - Albert Einstein

Offline VonYinzer

  • DTT SUPPORTER
  • *
  • Posts: 18384
Re: 1981 Yamaha SR250 Cafe Racer
« Reply #242 on: Mar 17, 2010, 14:42:30 »
Very cool man. I love this build.
Like a river that don't know where it's flowin'
I took a wrong turn and just kept goin'

Offline Rocan

  • Posts: 4874
  • "Long after I rest, my steel will live on"
Re: 1981 Yamaha SR250 Cafe Racer
« Reply #243 on: Mar 17, 2010, 20:18:34 »
i hope you checked tire clearance...  on the cb350 the tire could scrape that.

just watch out for it  ;)
PJ- Cafe's don't really work right until you get rolling 70mph +

Honda CB350 Project- www.dotheton.com/forum/index.php?topic=8643.0

Honda C100 Restoration- www.dotheton.com/forum/index.php?topic=38653.0

Offline thompsonmx100

  • DTT SUPPORTER
  • *
  • Posts: 1348
Re: 1981 Yamaha SR250 Cafe Racer
« Reply #244 on: Mar 17, 2010, 23:25:33 »
Cool little box. well designed nice and hidden. Keep it up.
always a hint of danger. Like a skanky chick at a bar. You know the diseases she has will kill you, but you still want to ride the shit out of her.
Biker Babes Bobber http://www.dotheton.com/forum/index.php?topi

Offline lunar_c

  • Posts: 122
Re: 1981 Yamaha SR250 Cafe Racer
« Reply #245 on: Mar 21, 2010, 01:19:13 »
Hey guys,
Yesterday afternoon my tail light came from Trojan Classics. It's an alloy body Lucas 525 replica. It's shape matches the profile of my cut down rear fender nicely, so all I had to do was drill a hole to fit it. I reckon it looks mint. I can't wait to have it on the bike for the final mock up before I send the tank and seat off to get painted.




If you can't explain something to your grandmother, you don't understand it - Albert Einstein

Offline lunar_c

  • Posts: 122
Re: 1981 Yamaha SR250 Cafe Racer
« Reply #246 on: Mar 25, 2010, 06:43:06 »
A little bit of progress today.
Got the seat in primer .. it still has a few bits that need filling (fiberglass is a bitch to get smooth as you can sometimes get little bubbles in it, even when you roll it) but I think I'll leave that to the painter now, I've done the best I can.



Also I have nearly finished the upholstery pan. I just need a thin sheet of that thin stretchy foam stuff to lay over the top to make everything smooth before it gets covered.



And finally, I got the curved fiberglass electronics tray finished, mounted and painted. I'll work on mounting the electronics and battery inside it soon.

Here's a top down view :



And not much of a view from the side :



I'm still working on mounting the rear guard. I welded up a top mount this afternoon and I'm working on the side mounts.

Regards,
Ben
If you can't explain something to your grandmother, you don't understand it - Albert Einstein

Offline lunar_c

  • Posts: 122
Re: 1981 Yamaha SR250 Cafe Racer
« Reply #247 on: Apr 14, 2010, 08:41:45 »
I fitted a piston-style steering damper this evening. I drilled a hole into the heavy-gauge bracing gusseted under the head stem of the frame to attach the damper bracket ..



And drilled and tapped an m8x1.25 hole in the lower triple clamp to accept the threaded rod end of the damper. Simple and it works.



So now that's done, I no longer need the tank on the bike to work out clearances .. so it can finally go to the painter. Browncow! I'll be needing you now, dude!

Thanks to Chris and Caz for donating the damper! You two are so cool it's a wonder you don't need defrosting.
If you can't explain something to your grandmother, you don't understand it - Albert Einstein

Offline jay_kent

  • Posts: 1297
  • 1979 cb650
    • Cafe build blog
Re: 1981 Yamaha SR250 Cafe Racer
« Reply #248 on: Apr 14, 2010, 15:27:03 »
Looks good bud, that great work on the seat.

Jay
DTT build thread - here
More pics at my Cafe build blog - Here

"And yeah David...you're pretty much bugshit nuts just like the rest of us." ~Swagger

Offline Wabba

  • Posts: 23
  • Don't smoke shisha and ride
Re: 1981 Yamaha SR250 Cafe Racer
« Reply #249 on: Apr 15, 2010, 07:04:32 »
Hello all!

Just found this forum and thread. Huge thumbs up on the bike. And I'm blaming you for me not being able to look at my bone stock SR250 anymore :D  Something has to be done...
Go Kallio Go!!!