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Author Topic: Yamaha SR250 - A clean standard build  (Read 107635 times)

Offline DesmoBro

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Re: Yamaha SR250 - A clean standard build
« Reply #30 on: Jun 24, 2015, 10:49:20 »
Chimichanga!
"I desire the things that will destroy me in the end"

Offline JadusMotorcycleParts

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Re: Yamaha SR250 - A clean standard build
« Reply #31 on: Jun 25, 2015, 05:49:07 »
Glued the printed seat pieces together but don't like it...  Will make some small adjustments then print another before I start making the base and shaping the foam.

Also got me some YSS shocks from wrenchmonkees to get the frame/tank line right/level.  Went up to 335mm i think?  Plus the rear wheel all laced up.  That was a pretty straight forward affair - take lots of photos of spoke lace pattern, disassemble, measure spokes, order a custom set in stainless from central wheel, powder coat the rim and hub, then lace it all up and have a tyre fitted!  This time a 130/90 Metzler  ;D

Offline JadusMotorcycleParts

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Re: Yamaha SR250 - A clean standard build
« Reply #32 on: Jun 25, 2015, 06:03:55 »
Lots of stuff arrived yesterday so got a bit done today.  New front wheel spokes were mostly correct this time (will make a document to update with the correct dims) so I laced that up.  Also Got some really cool stuff back from my machinist friend.  The parts are aluminum and anodized in black.  Includes the 2-piece fork brace plus gaiter adapters, the tank lowering kit, a center mount bracket for the speedo and and a top yoke tidy kit.

Offline stroker crazy

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Re: Yamaha SR250 - A clean standard build
« Reply #33 on: Jun 25, 2015, 08:35:57 »
Nice parts!

It's a pity I live on the other side of the planet, otherwise I would ask for an introduction to your friend.

Crazy
“Ride like the Wind” W.H.

Offline cosworth

  • Posts: 561
Re: Yamaha SR250 - A clean standard build
« Reply #34 on: Jun 25, 2015, 12:14:51 »
ok, i'm just gonna throw this out there but if you make some decent 3d printed bits, you have customers.
1981 SR250 café hot rod (sold)
1976 XS360 collector plates
1980 XS400 (on the bench)
1981 XS400 (in pieces)
2017 Husqvarna 701 enduro
Livin' the dream in western Canuckistan

Offline HollywoodMX

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Re: Yamaha SR250 - A clean standard build
« Reply #35 on: Jun 25, 2015, 21:30:27 »
Glued the printed seat pieces together but don't like it...  Will make some small adjustments then print another before I start making the base and shaping the foam.

Also got me some YSS shocks from wrenchmonkees to get the frame/tank line right/level.  Went up to 335mm i think?  Plus the rear wheel all laced up.  That was a pretty straight forward affair - take lots of photos of spoke lace pattern, disassemble, measure spokes, order a custom set in stainless from central wheel, powder coat the rim and hub, then lace it all up and have a tyre fitted!  This time a 130/90 Metzler  ;D

So the 3d seat is just a moch up for the new foam seat that will eventually be??

Are there structural specs for the plastic in the printer? Just worried about the fork brace cracking..
TR1 Build thread: http://www.dotheton.com/forum/index.php?topic=54733.0
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77 KZ1075 Supercharged - 81 Yamaha XV920rh (x2) - 06 YZ250 highly modified - 08 Hyabusa

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Offline JadusMotorcycleParts

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Re: Yamaha SR250 - A clean standard build
« Reply #36 on: Jun 26, 2015, 03:48:56 »
So the 3d seat is just a moch up for the new foam seat that will eventually be??

Are there structural specs for the plastic in the printer? Just worried about the fork brace cracking..

Yes exactly, just a mock up.  If I was only planning on making one seat, I would just buy some foam and shape it - will still probably do that for this bike actually.  However, I am planning on making many seats, so I want it to be right.  Thats why I bother to print the full seat in 3D for fitting purposes and to see how the proportions work with the bike.

As for the other plastic prototyped parts, these are also just prototypes.  I build the 3D file, print it out in plastic for a test fit, then make any modifications before I send the final 3D file to my buddy who is a cnc programmer.  I help him with some modelling/design stuff and he machines shit for me.  Pretty sweet relationship.  I have contacts with a couple of local firms too that could do batch production runs of the parts  ;D

Offline JadusMotorcycleParts

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Yamaha SR250 - Shaving the front forks
« Reply #37 on: Jun 27, 2015, 09:49:19 »
Shaving the forks... without a lathe.  The ghetto method:  Hack off the aluminium fork mount bosses with your weapon of choice (mine was a hacksaw), grind smooth(ish) with a grinder - pref a flapper disc (be careful here not to take off too much - you cannot add material later, file back roughly with a metal file, using an old automotive panelbeating trick, paint the area you are wanting to smooth, then file lightly again - this will highlight your low spots and your high spots and give you a better idea where to file.  It really helps if you have an automotive file - one with big chunky waves almost - i picked up mine for a couple of bucks from a second hand store.  It keeps things pretty even.  Repeat this painting and filing process as many times as you like until you feel you have shit pretty smooth.  Then just sand with wetndry sand paper - i didnt go too hardout here because i wont be polishing them anyways - not a fan of shiny shit.  I will probs just beadblast then paint, but maybe not even paint?  Will have to see what they turn out like.

Offline JadusMotorcycleParts

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Re: Yamaha SR250 - A clean standard build
« Reply #38 on: Jun 27, 2015, 09:58:08 »
Test fit the speedo center mount bracket and top yoke tidy kit.  Looks sweet!  Gotta make a couple of adjustments to the 3D files and 2D drawings if I was to make a bulk order, but these were pretty close for prototypes.

Also, just finished my other bike project - a mashtard Honda XL600V.  This was a scrappy as hell build with many rushed hand made parts and first attempts at many different things - welding sheet metal, welding stainless tuning downdraft carbs etc etc.  Turned out a bit like a mad max bike haha ratty as fuck.  I am hoping to redo everything to a much higher standard next winter.  Heres hoping right? 

Offline JadusMotorcycleParts

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Yamaha SR250 - 16 inch front wheel
« Reply #39 on: Jun 27, 2015, 10:06:35 »
Yus!  Got the 120/90 metzler front tyre (actually a rear running in reverse) fitted yesterday and it looks dope.  All chunky like.

Then I tested the fitment of the fork brace properly and fitted up a 3D printed fender.  Not convinced on the size, shape or position of the fender but it is in the right direction.  The fork brace came out great though - the gaiter adapters work well and the gaiters I found are the perfect size - diameter wise top and bottom and lengthwise too (hate that 'smooshed gaiters that were too long' look).