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Author Topic: Project: YZ250R  (Read 38997 times)

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Offline twosmoke595

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Project: YZ250R
« Reply #60 on: November 20, 2012, 11:00:27 PM »
Quote from: TCI Performance on November 21, 2012, 06:51:01 AM
Don't get me wrong....I agree with a lot of what he posted and therefore know he has good knowledge about this subject.

That's the reason I asked about some pictures of his own doings because I love seeing other peoples approaches. I am pretty new on here so I don't know if he has posted pictures in the past or not but if he did please post a link.

The problem is that some of them talk a good story but they can't back it up. Not saying that bearorso is that type of person especially since he sounds like someone that knows what he is talking about. But like I always say.....seeing is believing.

For me personally.......I applaud anyone trying to keep developing the 2-Strokes no matter if he is working out of a shed in the backyard or has a reputable company like myself.

Again our core business is not building bikes.....but it's the racing experience combined with the passion and knowledge that drives me personally to spend the time, effort and money to hopefully build the baddest looking most technologically advanced 2-Stroke to date. It's a dream of mine and I am going after it and nobody is going to change that.


you have our support :)
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline 2T Institute

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Project: YZ250R
« Reply #61 on: November 21, 2012, 06:45:59 AM »
Quote from: TCI Performance on November 21, 2012, 06:51:01 AM
Don't get me wrong....I agree with a lot of what he posted and therefore know he has good knowledge about this subject.

That's the reason I asked about some pictures of his own doings because I love seeing other peoples approaches. I am pretty new on here so I don't know if he has posted pictures in the past or not but if he did please post a link.

The problem is that some of them talk a good story but they can't back it up. Not saying that bearorso is that type of person especially since he sounds like someone that knows what he is talking about. But like I always say.....seeing is believing.

For me personally.......I applaud anyone trying to keep developing the 2-Strokes no matter if he is working out of a shed in the backyard or has a reputable company like myself.

Again our core business is not building bikes.....but it's the racing experience combined with the passion and knowledge that drives me personally to spend the time, effort and money to hopefully build the baddest looking most technologically advanced 2-Stroke to date. It's a dream of mine and I am going after it and nobody is going to change that.

So what are we seeing? A YZ250 with a sticker kit and a slightly modified frame. When is all the technology going to be applied?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline factoryX

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« Reply #62 on: November 21, 2012, 08:34:10 AM »
Think they're aiming for Geometry fixes if anything. What I would personally aim for is lowering the weight as much as possible, and moving weight lower on the frame. Gas tank under the seat air filter above the engine(Tri-z style), Rad under the seat etc.. Plenty of possibilities to try. If you make your own frame at this point it would probably go farther.
« 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 Jeram

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« Reply #63 on: November 21, 2012, 11:19:50 AM »
looks good aesthetically.

I will withold any other judgements untill the "technical improvements" are completed at some point in the future.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Markopolo400

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« Reply #64 on: November 21, 2012, 10:38:46 PM »
What level of temper did you heat treat the frame to after it was welded?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline factoryX

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« Reply #65 on: November 22, 2012, 12:53:56 AM »
Interested in this as well
« 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 TCI Performance

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« Reply #66 on: November 25, 2012, 03:53:31 AM »
As said in the very beginning of my initial post  there are two stages to this build. This is the 1st stage which will allows us to implement and test our chassis changes as well as a possible new intake system. The next stage will be where the "Technology" comes into play. That as mentioned as well will be the fuel injection system which we have started to work on already. This will be the more intense part of our project  in order to get it to perform the way it needs too and therefore it will take some time to get it right. In the meantime we have built the platform which we will use to test out all the chassis and handling improvements we are aiming for. As with any development projects the details of what has been done or how it was accomplished will not be shared.........at least at this point. As far as the temper question on the alloy......not sure if you guys are questioning my knowledge on this subject, don't know the answer or are just curious. All I will say is that the frame has been properly processed to get it back to it's original strength (temper) where it was prior to welding. There are many theories about welding aluminum frames. Some say they don't need it some say it's made of 7000 Series AL so it self anneals and some say don't ride without heat treating it but there is only one correct answer. You better know your alloys and their properties and if you don't know what you're doing don't do it.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Uniflow

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« Reply #67 on: November 25, 2012, 05:20:40 AM »
So how did you heat treat the frame without the rest of it distorting? Usually heat treat then machine.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Uniflow

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« Reply #68 on: November 25, 2012, 11:01:47 PM »
Assuming 6061 T6?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Uniflow

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« Reply #69 on: November 25, 2012, 11:11:41 PM »
We manufacture Aviation gearboxes, we use ( castings ) CC601 heat treated to T6. We cast, fettle, rumble, heat treat to T6,  involves bringing the castings to nearly melting for I think about 16 hours then quench . Then some other process after at about 200 degrees for a few hours. This is done by Heat Treatments in NZ. The castings post heat treating are very strong and machine well. I did talk to Heat treatments about treating an alloy frame after welding and was told by rights it should be taken back to T0 ( whole frame ) then re heat treated to T6 again. This would probably distort the bearing housings already machined, so I didn't bother.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TCI Performance

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« Reply #70 on: November 26, 2012, 06:03:34 AM »
T0 to T6 is correct. If properly done the distortion can be minimized if not eliminated. In our case we where prepared to plug and re-machine the critical features if needed but with a few tricks on prepping the frame prior to heat treat we where good to go without post machining afterwards.

In your case you didn't bother modifying or heat treating after modification?

I know of several guys that have built AF conversions and said that they don't heat treat afterwards. Some say they just weld small sections at a time thus preventing the frame from getting too hot. The fact is that when you weld a section of the frame you are bringing the material to melting temperature thus altering it's temper some. Because the frame is not kept at that temperature for a long period of time it will not get back to T0 but certainly loos some of it's strength which can cause stress fractures down the road followed by complete frame failures. Not a risk I'm willing to take.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Uniflow

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« Reply #71 on: November 26, 2012, 07:49:41 AM »
No, I didn't bother cutting the frame. I'm making new engine cases instead to suit the original mounts. I'm happier to do it this way as I wanted a different engine layout anyway.
I've seen too many alloy frame / weld disasters, It must be heat treated afterwards.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline SachsGS

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« Reply #72 on: November 26, 2012, 03:10:09 PM »
During welding if you don't apply enough heat you won't get the penetration and if you don't get the penetration you won't get proper bonding (a cold weld).
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Lolerbabop

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« Reply #73 on: November 26, 2012, 10:16:05 PM »
Get Brett Cue to ride this thing!
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TCI Performance

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« Reply #74 on: November 27, 2012, 03:06:42 AM »
As soon as the bike is ready for them we have to current pro's lined up to do a "first impression" ride and more thereafter.

Just waiting to finish up some loose ends on the bike so we can get started with testing.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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