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Author Topic: Yamaha SR250 - A clean standard build  (Read 114003 times)

Offline zap2504

  • Posts: 346
Re: Yamaha SR250 - A clean standard build
« Reply #40 on: Jun 28, 2015, 17:37:40 »
A better brake would be awesome actually.  Pretty pricy though I think?
Probably way too late for you on this project, but I have seen where the Yam XV250 Virago whole front end will fit on to the SR250 with an AllBalls kit. Then you get a front disk brake and 33 mm fork tubes, but you would still have an 18" spoke rim.

Very interesting prototyping! Let us know when/where you decide to market your finalized parts.

Offline JadusMotorcycleParts

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Re: Yamaha SR250 - A clean standard build
« Reply #41 on: Jun 29, 2015, 09:40:10 »
Yeah too late now, but goods tips for any future SR250 builds.  That would have been mint.  I think thats the same conversion I did for my DT400 project actually - so I could get the single front disc instead of the ratty drum brake.

Will put up a link to a webshop when parts are made and ready to sell  ;D

Offline JadusMotorcycleParts

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Re: Yamaha SR250 - A clean standard build
« Reply #42 on: Jun 29, 2015, 10:19:22 »
Couple things today...  received a nice photo from my exhaust contact - hoping to receive it in the mail before the end of the week if he sends it today.  Plus testing out the battery box prototype in aluminium - got a couple of things that need adjusting if I were to make an order.  Then I got thinking where I would like to re-locate the ignition too...  I think somewhere up the front in the front of the tank.  Looks cool there.

Offline JadusMotorcycleParts

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Re: Yamaha SR250 - A clean standard build
« Reply #43 on: Jul 03, 2015, 03:55:37 »
Finally got to test fit the exhaust.  I like the look and shape - I think the bends and lines work with the engine and frame nicely.  If I were to order in bulk to be able to sell them I would make a few small adjustments but these will be slick headers!  The only aftermarket one for the SR250 that I know of?

Also, spent a lot of time fixing my mates scooter.  Damn I hate scooters.  It had about 60psi of compression and stuffing some oil in the plug hole bought it up to 80psi so it could run for a minute or so.  So I suspected bad rings or cylinder wear.  But when I opened to valve cover it turned out just to be a tight exhaust valve that wasn't closing properly (bad service from the last dude that worked on it I suspect).  Once that was set straight the compression came up to 120.  Just good enough to run for another season or so!

Also got to test the ignition relocation bracket I prototyped.  Would there be any interest for these?  Rekon it looks/will look quite nifty ;)

Offline Shawzie

  • Posts: 38
Re: Yamaha SR250 - A clean standard build
« Reply #44 on: Jul 04, 2015, 17:55:05 »
Bike is looking great. Love the look of the front wheel! I'm sure you'll get a few haters on the performance tho. So it's a stock sr250 rear rim on the front right? How did you measure for spokes?

Offline Knuckles

  • Posts: 17
Re: Yamaha SR250 - A clean standard build
« Reply #45 on: Jul 04, 2015, 18:59:41 »
That front wheel has some serious attitude. That is the one thing that I have been pondering since I started tinkering with my 81 SR several months ago.... You seem to have found an amazing looking solution, although I am still curious about the performance. A+ on appearance! Can't wait to see how it turns out....
1981 Yamaha SR250

Offline zap2504

  • Posts: 346
Re: Yamaha SR250 - 16 inch front wheel
« Reply #46 on: Jul 06, 2015, 11:54:19 »
Yus!  Got the 120/90 metzler front tyre (actually a rear running in reverse) fitted yesterday and it looks dope.  All chunky like.
Did the front tire choice force shaving the OEM front fender mounts? it looks like the tire might still be touching the fork legs, and may be why I'd heard that the largest practical front tire size is 100/90-18.

Offline JadusMotorcycleParts

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Re: Yamaha SR250 - 16 inch front wheel
« Reply #47 on: Jul 07, 2015, 03:11:09 »
Did the front tire choice force shaving the OEM front fender mounts? it looks like the tire might still be touching the fork legs, and may be why I'd heard that the largest practical front tire size is 100/90-18.

No, actually the 120 tyre would have fit with the fender mounts in place.  However, the fender would not have.  If you wanted to use the fender mounts to actually mount a fender with the 120 tyre, you would have to make some custom brackets to clear it.

And no, the 120 tyre is not even close to touching the fork legs.  In fact, I wish I had ordered a 130 tyre for it and it would have looked even more badass.  Because the thing is, the options for 120 front tyes is very slim, while there are many options for 130mm front tyres - due to harleys and other japanese cruisers.

I also know that a 4.00 - 19 front tyre will fit.  It just looks a little goofy!

Offline JadusMotorcycleParts

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Re: Yamaha SR250 - A clean standard build
« Reply #48 on: Jul 08, 2015, 07:43:43 »
Bike is looking great. Love the look of the front wheel! I'm sure you'll get a few haters on the performance tho. So it's a stock sr250 rear rim on the front right? How did you measure for spokes?

I dont understand the haters.  Are they just wanting to hate?  Or do they have a genuine concern for my safety when riding this motorcycle with a 16'' front wheel?  At the end of the day, we are talking about a bike with 239cc's and between 17-20rwhp depending on which model.  Really that dangerous?  I have seen many bikes with a 16'' front wheel, even race bikes.  Even down to 15''!  So I am sure it will be no problem  ;)  The front end of this try hard chopper (stock) has so much rake in it that dropping the front end and raising the rear will improve the handling capabilities anyway.  Also, if you are ever interested/wanting to check tyre comparrisons, check out this comparison tool.  It even has a visualiser which is really neat.  The diameter difference between stock and the new tyre are not much at all  ;D 

https://www.tacomaworld.com/tirecalc?tires=90-90r19-120-90r16

As for the spokes, it was a percentage calculation I did to get the right lengths and angles.  I messed it up once but then adjusted and ordered again.  Now they are perfect.  Thats the way R&D goes I guess.  I will be selling these spoke kits on a webstore soon if you are interested?  I could send you one of the first kits that I get?

Offline zap2504

  • Posts: 346
Re: Yamaha SR250 - A clean standard build
« Reply #49 on: Jul 08, 2015, 11:51:25 »
It may be more of a concern for the greater amount of front tire weight creating a greater gyroscopic force. Regardless, looking forward to actual riding tests to see how this new combination works out.

And looking forward to the availability of specialty SR250 parts (especially the header and front fork brace/fender)! Given the long world-wide model run, you might have a winning product line.