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Author Topic: YZ 250 EFI  (Read 73312 times)

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Offline jared31

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YZ 250 EFI
« Reply #75 on: March 21, 2013, 12:30:09 PM »
Quote from: Uniflow on March 09, 2013, 07:21:06 AM




Suitable bike to use, not cleaned from last ride!!



Injectors in place, still need to make the fuel rail. This will be connected to some head studs.



All the bits are starting to come together for the YZ250 EFI project.
  The two Injectors that you see inserted into the cylinder is what I Audit everyday at General Motors,We also make Injectors for The Harley Davidson line of Bikes.Awesome to see what You make being used in the sport you love.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline vetman

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YZ 250 EFI
« Reply #76 on: March 21, 2013, 09:19:47 PM »
Keep going buddy awesome work
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Uniflow

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YZ 250 EFI
« Reply #77 on: March 23, 2013, 04:42:53 AM »
Should be working on the EFI systems but but decided to go to the Mihihi trail ride today with the EFI Bighorn. 40 K track, Bighorn did 39.5 ! Had a great time slugging it out with a 250F, hammer and tong ( more soft hammer and centerpunch ) He would get me out of the corners and into the corners but the bighorn was all over him on the open straighter bits. He was getting pissed off as he couldn't shake me and every time the track opened up I'd have him!! Great fun, you should have seen the look on his face when he was in front and looking to see where I was and what I was going to do next. Round the last corner and I had about 20 feet on him, would have won ( apparently you can't win a trail ride ), BUT the wire that handles all the current to everything broke and the mighty Bighorn  stopped!! So the 250F beat me   bugger. Haven't had so much fun in a long time. Walked back with tools, fixed it and rode it out so by rights it did finish. The wiring loom resembles more of a birds nest than anything, should spend some time tidying it up    probably?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Uniflow

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YZ 250 EFI
« Reply #78 on: March 23, 2013, 04:44:30 AM »
jared31,   I'm using the same injectors in the Bighorn.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Stusmoke

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YZ 250 EFI
« Reply #79 on: March 23, 2013, 04:48:03 AM »
Quote from: Uniflow on March 23, 2013, 11:42:53 AM
Should be working on the EFI systems but but decided to go to the Mihihi trail ride today with the EFI Bighorn. 40 K track, Bighorn did 39.5 ! Had a great time slugging it out with a 250F, hammer and tong ( more soft hammer and centerpunch ) He would get me out of the corners and into the corners but the bighorn was all over him on the open straighter bits. He was getting pissed off as he couldn't shake me and every time the track opened up I'd have him!! Great fun, you should have seen the look on his face when he was in front and looking to see where I was and what I was going to do next. Round the last corner and I had about 20 feet on him, would have won ( apparently you can't win a trail ride ), BUT the wire that handles all the current to everything broke and the mighty Bighorn  stopped!! So the 250F beat me   bugger. Haven't had so much fun in a long time. Walked back with tools, fixed it and rode it out so by rights it did finish. The wiring loom resembles more of a birds nest than anything, should spend some time tidying it up    probably?

HAH! I guess his more "advanced" fooper didn't do him much good did it?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Uniflow

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YZ 250 EFI
« Reply #80 on: March 23, 2013, 05:17:49 AM »
It's funny cause I would absolutely roost him on the hills, and that Bighorn can dig some terrain. I wouldn't hear him for a while, must have got sick of rocks getting thrown at him. One time the 250F was in front up a long hill and he tried to roost me. 250F can't roost it was funny it was a pathetic attempt. By rights he should have pasted me but I could see his suspension wasn't too good, he was all over the place, mind you so was I but I have a 1973 excuse. It's just that I'm so happy I've got that EFI Bighorn running so well now, It's too much engine for that frame and suspension.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline citabjockey

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YZ 250 EFI
« Reply #81 on: March 23, 2013, 05:56:53 AM »
Even stock a bighorn has too much engine for the rest of the bike! Must be VERY interesting with even more beans on tap!

Quote from: Uniflow on March 23, 2013, 12:17:49 PM
It's funny cause I would absolutely roost him on the hills, and that Bighorn can dig some terrain. I wouldn't hear him for a while, must have got sick of rocks getting thrown at him. One time the 250F was in front up a long hill and he tried to roost me. 250F can't roost it was funny it was a pathetic attempt. By rights he should have pasted me but I could see his suspension wasn't too good, he was all over the place, mind you so was I but I have a 1973 excuse. It's just that I'm so happy I've got that EFI Bighorn running so well now, It's too much engine for that frame and suspension.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Yamaha CT3, RT3, MX125, SC500, Toy Prius, Diesel F250 (it all balances out)

Offline Stusmoke

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YZ 250 EFI
« Reply #82 on: March 23, 2013, 08:13:12 AM »
Hey uniflow you should put the big horn into a newer chassis with newer suspension. That would be a weapon right there. Blasphemy I know but a good racer :D
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline 2T Institute

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« Reply #83 on: March 23, 2013, 08:40:38 AM »
Quote from: Uniflow on March 02, 2013, 04:34:13 PM






I don't see a water gallery for water cooling the crankcases?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Uniflow

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YZ 250 EFI
« Reply #84 on: March 23, 2013, 08:08:08 PM »
2T you are not looking hard enough, it's there.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Uniflow

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YZ 250 EFI
« Reply #85 on: March 23, 2013, 08:19:53 PM »
I did think about it ( putting the Bighorn engine in a modern frame), but got talked out of the idea. That's why I've gone off on this tangent to build this new 360 engine. Sort of what a modern Bighorn engine might be and I won't have to cut the frame.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Uniflow

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YZ 250 EFI
« Reply #86 on: March 23, 2013, 08:32:09 PM »


This frame is a DT / MX 360 frame not Kawasaki ( they were bad frames ). The engine compartment has been shortened 40mm with the swing arm lengthened 40mm. Engine is 40mm further forward. Forks are TZR 250 ( 39mm Dia ) units with race tec valves inside. Custom tripple clamps. Rear shocks are modified TT500 units. So for what it is the Bighorn handles ok. Rear shocks are still a little hard, as 2T pointed out I should change them. Biggest problems are weight and rider.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline 2T Institute

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YZ 250 EFI
« Reply #87 on: March 23, 2013, 08:49:43 PM »
I can't see it Neil, Aprilia has a complete loop around the crankshaft cavity coming into the cyl under the exhaust port.

http://www.igkoenigsklasse.de/index.php?option=com_marketplace&view=entry&catid=4%3Aparts&entry=2724%3Aaprilia-rsw-125-motorgehaeuse-magnesium&Itemid=100011
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline _X_

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YZ 250 EFI
« Reply #88 on: March 23, 2013, 11:36:47 PM »
uni you a dadass mofo! those short travels turn so good.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Uniflow

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YZ 250 EFI
« Reply #89 on: March 23, 2013, 11:46:53 PM »
There is quite a cavity in behind the rotary valve that will be sealed off. Good to run water through perhaps, injecting the fuel after the crank case might need a water cooled case?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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