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Author Topic: YZ 250 EFI  (Read 155680 times)

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Offline Uniflow

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YZ 250 EFI
« Reply #165 on: May 19, 2013, 08:12:46 PM »
Yes
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TMKIWI

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« Reply #166 on: June 05, 2013, 10:13:48 AM »
Hows the bike going Neil.?
« 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 eprovenzano

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YZ 250 EFI
« Reply #167 on: June 05, 2013, 12:49:38 PM »
Quote from: TMKIWI on June 05, 2013, 05:13:48 PM
Hows the bike going Neil.?
Inquiring minds want to know....
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Eric Provenzano
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Sold 1991 KDX 200... fun play bike
Sold 1999 KX250
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Sold but never forgotten 1974 Honda Elsinore CR250M
Sold 1974 Honda Elsinore CR125

Offline Uniflow

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YZ 250 EFI
« Reply #168 on: June 09, 2013, 07:42:04 AM »
Good, thank you.
I know this is not what you want to hear, more excuses, the YZ 250 EFI is running well, but we have not had a decent chance to get video. Weather has been bad or finally got sorted for this Saturday's Epic Events trail ride in Taupo , Owner ( Wayne of Blackwood Yamaha ) has just been too busy selling bikes and couldn't make it on Saturday and Sunday pissed down again! We have had a fuel pump bugger up ( made in china ) that slowed us down for a while until it was realized what had happened. New computer has not arrived yet ( the one that costs less that half the Link ) so haven't had a chance to look at that yet. But we have discovered that the Link can vary the end of injection timing, through an overlay table, so we are working though this now.
I did attend the Saturday ride with the F9 ( and the new injection timing software ) and proceeded to tune it into a rocket. I have looked at putting this engine in a modern frame but it's just too big and would need a frame change and I'm not willing to do this to my alloy 250F frame. Work is still proceeding  with the YZ360 cases ( to fit the 250F frame ) but it is slow. Too much fun riding the F9 in the weekends.


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

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YZ 250 EFI
« Reply #169 on: June 10, 2013, 01:12:09 AM »


This Epic Events ride was a lot of fun.
Thanks Dave for the photos.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Z50Jay

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« Reply #170 on: June 16, 2013, 04:02:41 AM »
This project is great. I think your name should be changed to 'Picasto'
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Marco810

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YZ 250 EFI
« Reply #171 on: June 18, 2013, 01:58:44 PM »
Not sure if this has all the functions you need but the price is better http://www.diyautotune.com/catalog/microsquirt-engine-management-system-839-wiring-harness-p-509.html
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline CCOADY454

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« Reply #172 on: June 18, 2013, 02:45:59 PM »
Quote from: Uniflow on February 01, 2013, 02:41:17 PM
The other in the YZ250F frame with my own 360 engine, 
Similar to Husqvarna 360 engine by chance?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TotalNZ

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« Reply #173 on: June 18, 2013, 07:50:53 PM »
Quote from: CCOADY454 on June 18, 2013, 09:45:59 PM
Quote from: Uniflow on February 01, 2013, 02:41:17 PM
The other in the YZ250F frame with my own 360 engine, 
Similar to Husqvarna 360 engine by chance?
Not similar to any dirtbike 2t motor i've ever seen. There are pics and more info in another thread.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline cnrcpla

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« Reply #174 on: June 19, 2013, 12:35:52 AM »
Ohhh yeah the 360 kit thread. Where you going to sell those kits in the future or was that not yet decided?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Uniflow

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« Reply #175 on: June 19, 2013, 04:31:42 AM »
I did consider building 360 cylinders for the YZ250 but have been told from several different people    ( who should know ) not to bother, couldn't make it cost effective enough. It's only a hobby and not worth the time, there are other kits out there ( 300 cc ish ), my kit would cost more.
Yes, I'm concentrating on getting this NEW 360 engine finished. This is not a production engine, it's a one off to test all the bit's of technology I've developed from the F9, EFI YZ250 and a few other engines I've worked with. IF all goes well I would produce them for others, but they won't be cheap!
Lets concentrate on getting this first one up and running. Patterns are heading off to the foundry Monday so might have some heat treated case castings to look at by the end of next week.

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

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« Reply #176 on: June 20, 2013, 09:35:27 PM »
Gonna strap a supercharger/turbo to it at some point?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Uniflow

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« Reply #177 on: June 24, 2013, 09:22:59 AM »


First dyno run on the YZ 250  EFI.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline factoryX

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« Reply #178 on: June 24, 2013, 09:37:40 AM »
48hp isn't bad, considering that's what they were around before they were detuned. Can you post a pic of the RPM sheet?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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I ride an 03 yz250, wait 04, wait 05, what ever, they're all the same #$@% YOU!

Offline TMKIWI

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« Reply #179 on: June 24, 2013, 09:43:27 AM »
What revs is the limter cutting in ?.
Sound like it could pull abit more.
« 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
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