What 2T engine in YZ250F 11?

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3/10/2018 3:43 AM

Looking for ideas or experience as to what engine would be best to fit into my yamaha?

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3/10/2018 3:01 PM

any 99+ yz250 engine will do the trick :]

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3/10/2018 3:53 PM

Nice! I really want to do that swap one day to make a desert bike.

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Instagram: vanillaice782
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3/10/2018 5:48 PM

Is this a bolt-on or major fabwork required?

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3/11/2018 1:25 PM

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3/11/2018 6:57 PM

Jesus......I was having trouble seeing a bike in those last few pics lol.

I AM curious on what it takes to put a 99 or newer engine in the '10-'13 YZ250f frame......IMO IF Yamaha wanted to revamp it's 2 stroke lineup, they needn't look further than tossing in the current (same cases as the '99 YZ250) YZ250 2 stroke engine with a little bit in the way of frame modification bro the Y bracket on the '10-'13 YZ250f frame as their base for creating an "all new" 2 stroke model. Aesthetically this was, and still IS a very good looking bike and would modernize both the YZ125 & YZ250....... wouldn't hurt to make that YZ360 again in a bolt on GYTR kit as well. The '10-'13 YZ250f was a great chassis if I remember correctly it was just hampered by the pathetically outdated YZ250f engine. I wish Yamaha had gone this route with BOTH the 250f and 450f as the 2010 next generation model rather than releasing that I'll handling '10-'13 YZ450f IMO I don't think the bike was fully ready to go when Yamaha had released it and while I can't say for sure I do believe JS7's stint at Yamaha would've gone a lot better if so, plus they could've used fuel injection technology on the 450 within that design if they wanted to.

But to answer the OP, Yes, DEFINITELY shoot for stuffing in a YZ250 2 stroke engine If you can honestly I don’t know the difficulties specifics of what it would take to put that engine but I’m sure there is a lot of information on the Internet as well as plenty of people that have done it clearly from the pictures you can see at least two or three in this thread alone and if all else fails try to stuff a CR 500 or KX 500 motor in there LOL

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3/12/2018 12:04 AM

smezmx wrote: Photo

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Looks like one of those smart carbs... how do you like it?

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3/12/2018 8:11 AM

Great bikes! Thanks.

Any details on the major things.
Swingarm engine case mating?
Carb boot alignment?
Front down tube modifications?

Cheers

As mine stands
Okay cant get a pic to upload

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3/12/2018 9:58 AM

That bike is not mine and neither is that girl worst luck.it was built by tsi performance.there is another company called motofab who built a more modern conversion with an esr 345cc big bore motor.they also fab their own airboots from carbon fibre and move the shock....

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3/12/2018 10:11 AM

i bought a handmade carbon fibre/resin tank from italy that fit's yz 125/250's but uses the 10-13 yzf shrouds for a different look....just started stripping down a 16 125 for a frame up rebuild and will use it when it's ready


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3/12/2018 8:41 PM

You got to spill the beans where you got that tank from, so bad ass! Please don’t tell me it was a one off & I can’t get one as that would suck. If so just tell me it was like $700 so then I can justify not needing to buy it..... LoL

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3/12/2018 11:40 PM

cdoggy81 wrote:

You got to spill the beans where you got that tank from, so bad ass! Please don’t tell me it was a one off & I can’t get ...more

It was $700 wink

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3/13/2018 4:51 AM

I knew it.... sad

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3/13/2018 6:28 AM

cdoggy81 wrote:

I knew it.... sad

Im geussing it might have been moreshocked

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3/14/2018 8:46 AM

make1go wrote:

Great bikes! Thanks.

Any details on the major things.
Swingarm engine case mating?
Carb boot alignment?
Front down tube ...more

Front downtube must be modified to accomodate the center-exiting pipe. New engine mounts must be welded/made. New radiators must be fabricated to clear the pipe. Everything else can be made to fit with little work.

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8/18/2020 8:28 AM

make1go wrote:

Looking for ideas or experience as to what engine would be best to fit into my yamaha?

Olá, amigos. Aqui no estado de São Paulo /Brazil , eu também tive a experiência de aplicar um motor 250cc 2T ano 2002 em uma YZF250 ano 2015. Quero também compartilhar com vocês essa minha obra de engenharia. Achei que eu fosse o único.....Rsss Photo
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8/18/2020 8:29 AM

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8/18/2020 8:31 AM

YAMAHA 2002 em 2015(YZ250F) 2T Photo

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8/18/2020 8:48 PM

Otávio wrote:

YAMAHA 2002 em 2015(YZ250F) 2T Photo

El wapo!

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8/30/2020 6:47 PM

If you have access to a good welder/fitter you trust to do a good job, and is really going to take his time to do things properly without making it crooked it would be handy dandy to have a YZ250 frame to cut apart for the build.

The swingarm bolt is a different diameter than the yz 2 strokes, but it would be neat to see if that dr.d engine relocation kit would be able to work in the YZ250 cases, and then be able to play with where your engine sits, and be able to choose a good place for it in the frame, move forward/back/up/down etc, dreamy project really.

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9/1/2020 6:02 AM

Why ruin a good YZ250 twostroke by using that low cradle chassis.

Put a 450 in it and build a F450 road racer, then register it for road use.

Put the 900 triple in it, and a 3ft swingarm and climb Widowmaker

Or, bolt everything BUT the chassis, subframe, and tank to a 02 Steelie

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IG: persona_non_grata_moto

9/1/2020 6:10 AM

15tc150 wrote:

If you have access to a good welder/fitter you trust to do a good job, and is really going to take his time to do things ...more

The countershaft sprocket and swingarm pivot form two fixed points, so there's really only pace the motor can sit, with about a +/- 5° variance, plus the engine must sit "level" for the transmission to be oiled correctly.

Anything short of relocating the swing arm pivot hole will yield this low cradle condition. That's why the 4 stroke shock lengths are all +15 or +20mm over the twostrokes. To reach a lower linkage point in that lower cradle.

I'd like to use a 06 RM250 to set up the jig, throw the Suzuki frame away, and build my own trellis perimeter frame in the jig. Or do the same with a 09 KTM frame for the jig and see if I can get PDS to work right.

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IG: persona_non_grata_moto