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Author Topic: YZ 250 EFI  (Read 72588 times)

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Offline Jeram

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YZ 250 EFI
« Reply #15 on: February 01, 2013, 08:29:53 AM »
very nice mate
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Davo

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« Reply #16 on: February 01, 2013, 10:42:26 AM »
Brilliant work.

Have you looked at something like this for reducing the draw of the fuel pump at low rpm if its still an issue?... http://www.madhu.com/content/Main/FuelPumpController
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline 2T Institute

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« Reply #17 on: February 01, 2013, 12:25:36 PM »
Is that MDF?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Uniflow

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« Reply #18 on: February 01, 2013, 08:24:13 PM »
No, it's armmor board, sort of like MDF but much more resin used in making it. It's a bit like machining a soft cast iron. Sandable glueable and strong.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Formerly knownas Premixed

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YZ 250 EFI
« Reply #19 on: February 01, 2013, 10:47:05 PM »
Quote from: Uniflow on February 01, 2013, 02:41:17 PM
I'll be using the Link, same as my Bighorn, it works well. Link are releasing a special version for the two stroke ( from my input ) middle of the year. At last!!!
Just found a smaller pump today 2 amps usage and still an external type.
I'm not quite sure if it is apparent but I've got two YZ projects on the go. One is the standard YZ250 converted to EFI ( for the local Yamaha dealer).
The other in the YZ250F frame with my own 360 engine,  cases are cast and machined to suit the YZF frame so no cutting is required. This engine has vairable rotary valve, blade type power valve, reverse rotating crank and reverse cylinder. This engine will uses the vairable valve casing as the throttle, driven from the link computer ( throttle by wire ). Much better engine control!
Cut the first engine case pattern today in the CNC. I will be using castings.

If what you say in this post is true, and materializes, its going to be pretty amazing.  I'm going to keep my eye out for Link.

Is it a do-it-yourself breadboard type kit like Megasquirt, or is it 100% plug-and-play?  price range?

http://www.linkecu.com/
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Uniflow

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« Reply #20 on: February 02, 2013, 03:23:52 AM »
Link, that's them. They have helped me out with the conversion of their standard ECU to run on my Bighorn Kawasaki. The software inside works but could be better, that's what they are changing on the next version ( because I told them they would sell lots of ECU's to twostroke owners wanting to upgrade to EFI, suckers if they believe that :D ) they do work with twostroke snowmobiles already. The change is to suit transfer port injection. Not sold as a kit, they are ready to use just need setting up to the engine you want to put it on. Approx $1300 NZD for the ECU.
Link have been around for probably thirty years or more, good company to deal with, very helpful.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Uniflow

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« Reply #21 on: February 23, 2013, 07:49:55 AM »
Finally found time to make the inner drum. Had the CNC shell it out to 2mm.



« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TMKIWI

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« Reply #22 on: February 23, 2013, 07:56:08 AM »
Nice work.
Did you get any photos from Aria ?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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If you don't fall off you are not going hard enough

Offline vetman

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« Reply #23 on: February 23, 2013, 08:14:39 AM »
nice work you might have seen it already but go into youtube search yz/cr500 Fi pretty awesome bike thats been done downunder anyway good luck hope to see results soon
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Uniflow

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YZ 250 EFI
« Reply #24 on: February 23, 2013, 09:14:56 AM »
TM Kiwi, yes plenty of photos, David is editing them now.

vetman, yes saw the EFI 500 bike at a trail ride two weeks ago at Whakatane ( NZ ), only it's sporting a carburator now! Owner said that they had had so much trouble that they had tossed the EFI. He said to me you can't EFI a twostroke MX bike. Interesting as that's not what was said on the Youtube clip.
Whoever set the bike up made the same mistake everyone seems to, inject into the inlet. He said that they could never get it to run right up to 1/3 throttle. My Kawasaki will pull clean and crisp from off idle, inject into transfers not the inlet, been there done that.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline metal_miracle

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« Reply #25 on: February 23, 2013, 02:17:15 PM »
Been following your bighorn thread,
 but this really peak my interest. looking good
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline _X_

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« Reply #26 on: February 23, 2013, 03:00:24 PM »
this is truly works parts, brilliant uniflow.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline scotty dog

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« Reply #27 on: February 26, 2013, 10:00:39 PM »
Bloody good work, cant wait to see how the 360 comes out, youre a bloody clever fella Uniflow ;)
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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F**K THE WHALES......................SAVE THE 2 STROKE!!!!

The hardest part about riding a 4 stroke is telling your parents your Gay!!

05 CR 250

Offline Jeram

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« Reply #28 on: February 27, 2013, 03:34:50 AM »
Are you planning on using an airbox with a bell mouth and then place the airfilter at the inlet to the airbox?

Im assuming that your going to then build the optimum bell mouth for that throttle body to increase the CFM by a further 10% ?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Uniflow

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« Reply #29 on: February 27, 2013, 09:19:57 AM »
Jearm, we still haven't done your job yet!! Sorry, we have had some deadlines to meet ( you know, the work that pays the bills ). Phillip tells me the drawing is not quite on center. I think he has adjusted the drawing to suit now. Phillip will look at Monday or Tuesday to put your job through.

This throttle body you see here is to fit into the space on a YZ250 where the carb was. It still needs some machining to the inlet where the air box rubber boot fits. Cylinder still needs the injectors fitting, I've welded lugs on but not machined them yet. For some reason we are loaded with work at the moment ( you know real bill paying work ) and these jobs have to take a back seat.

In saying that I've set aside this weekend as a YZ360 cases patten, weekend.




« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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