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Coach529 Coach529
3/28/2021 7:07 PM

I ride a lot of Idaho Single Track, and most of my riding buddies have KTM or Husky 300's. I have always wished my YZ 250 had a little more grunt off the bottom. I tried a RK head, which helped, but I was still wishing for more. A little more HP on the MX track would always be welcome.

Photo

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I contacted Tom Morgan about a Big Bore kit. He got back to me immediately with three options, 265cc, 295cc and 315cc. The 295cc option seemed perfect so I shipped off the cylinder and head to Tom to work his magic.

Pure two stroke art when it arrived.

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Photo

Photo

Tom included an awesome reference manual about the build as well as jetting specs, etc.

I got it all installed and went for the first ride last week. Tom's baseline jetting spec was perfect. Bike requires a healthy boot to kick over and has a stout bark. After a couple heat cycles and checking nuts and bolts I was able to take it for a short ride on some technical wet single track. Very please with the added luggability. I found myself purposely going into hill climbs a gear higher just to see if it would would work. Put a couple hours on it and could not be happier. I hope to get out some more in the next week or so. I will report back.



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Coach529 Coach529
3/28/2021 7:43 PM
Photo
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garagedog garagedog
3/28/2021 7:54 PM

Great! Thanks for sharing.
Did you ship with the powervalves installed?

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Coach529 Coach529
3/28/2021 8:05 PM
garagedog wrote:

Great! Thanks for sharing. ...more

Yes. I sent it to him with them all installed. Tom did the modifications and sent it back the same way.

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wisey wisey
3/28/2021 9:53 PM

Nice!
How long did it take

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Yz229 Yz229
3/28/2021 9:59 PM

They run well. I went 295 first then went to 315 stroker!

Craigslist Roacher to YZ315 Stroker Red Bull Straight Rhythm Build Here

Instagram @FVISSION
Facebook @FVISSION

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ZOBITO ZOBITO
3/29/2021 12:26 AM

Can't believe you didn't go with an ESR 325, the best bike ever in the whole world.
Or a nice Varner cylinder you'd get in 2026.
laughing

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Coach529 Coach529
3/29/2021 7:23 AM
wisey wrote:

Nice!
How long did it ...more

I think around 4 weeks total.

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brimx153 brimx153
3/29/2021 10:03 AM

Love the look of the bike too .

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bvm111 bvm111
3/29/2021 10:12 AM

Tom is the man, he did my KX250 and couldn’t be happier with the motor, the service, the customer service, the reach back ... he answers the phone and gives advice like you aren’t bothering him. I kept mine standard bore but get comments every ride... is that a 500, or that thing sounds awesome!

Don’t piss off the old people - the older they get the less “life in prison” is a deterrent for them!

2021 KTM 350 SXF
2020.5 KTM 450 SXF FE
2006 KX250

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profeshenal125 profeshenal125
3/29/2021 10:38 AM

Sounds Great Coach529. Didn’t Tom do Black foot Honda cr250 engines ? Anyone have a 05-07 cr250 TMR engine work done ?

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Electro21 Electro21
3/29/2021 6:57 PM

I’m waiting on my tax refund to come in and I’m sending my stuff to him. 07 CRF 250R 269cc big bore kit. Need the cases bored and want the cylinder head ported. He was very quick to reply to emails, and pricing is better than anyone else I contacted.

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Coach529 Coach529
3/30/2021 9:58 AM
ZOBITO wrote:

Can't believe you didn't ...more

Ha......NOPE NOPE NOPE!!

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Coach529 Coach529
3/30/2021 9:59 AM
brimx153 wrote:

Love the look of the bike ...more

Thanks!! Photo

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ShawdowGlen ShawdowGlen
3/30/2021 10:10 AM

One word: BRAAAAP!!!!


I was raised just off HWY 126 in Valencia during the 80's.

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Coach529 Coach529
3/30/2021 3:44 PM
Electro21 wrote:

I’m waiting on my tax ...more

He is great to work with!!

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GeorgiePorgie GeorgiePorgie
3/30/2021 8:32 PM

Using a flywheel weight as well?

GP740
Since 1987

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de883zx de883zx
3/30/2021 10:10 PM

Mitch Tom and both Chad’s (eleven 10 and watts) are two stroke legends.

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Yz229 Yz229
3/31/2021 7:28 AM

Not a lot of TMR riding videos. Here is one of mine from 2019. This is the 315cc stroker Tom builds. Engine had slight water leak in cylinder, little rich and geared a little tall with squeaky breaks (fresh build), but was still a beast.

&t=181s

Craigslist Roacher to YZ315 Stroker Red Bull Straight Rhythm Build Here

Instagram @FVISSION
Facebook @FVISSION

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Coach529 Coach529
3/31/2021 8:33 AM
Yz229 wrote:

Not a lot of TMR riding ...more

That is awesome.

I have only ridden mine on single track so far, excited to get it out on the moto track.

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Coach529 Coach529
4/2/2021 8:32 PM

Spent the day at the MX track today with my boys. This thing is a arm stretcher. Pulls hard off the bottom, but signs off a bit earlier than a 250.

With my current gearing (14-50) I can easily roll through corners in 3rd with plenty of pull. Unreal. Thinking 14-48 would be a better, allowing 2nd to come into play and stretching out each gear a bit. I am also going to swap my PC shorty silencer for a longer version.

Also thinking about a GYTR FWW.

Photo

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Electro21 Electro21
4/2/2021 11:20 PM

Still waiting on my damn tax refund...Filed February 14th. Photo

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KiwiBermRailer KiwiBermRailer
4/3/2021 12:55 AM
brimx153 wrote:

Love the look of the bike ...more

Coach529 wrote:

Thanks!!

That is a nice looking bike man!!!

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Coach529 Coach529
4/3/2021 11:54 AM
brimx153 wrote:

Love the look of the bike ...more

Coach529 wrote:

Thanks!!

KiwiBermRailer wrote:

That is a nice looking ...more

Thanks!!

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profeshenal125 profeshenal125
4/3/2021 6:56 PM
profeshenal125 wrote:

Sounds Great Coach529. ...more

Anyone have a 05-07 cr250 TMR ported engine or a yz125 ? Thx

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Coach529 Coach529
4/4/2021 8:25 AM
GeorgiePorgie wrote:

Using a flywheel weight as ...more

Not yet.

Looking at testing one at some point.

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SKIDLID SKIDLID
4/4/2021 12:25 PM
profeshenal125 wrote:

Sounds Great Coach529. ...more

profeshenal125 wrote:

Anyone have a 05-07 cr250 ...more

Had a 98 yz 125 done by TMR for a summer. Had a flat Honda piston in it and a washer under spark plug for clearance . Lots of top end with no bottom. For a bigger 125 rider and maybe not fast enough I missed the bottom.

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GeorgiePorgie GeorgiePorgie
4/4/2021 5:55 PM
Yz229 wrote:

Not a lot of TMR riding ...more

Whoever thumbed this down has surely found pleasure in blowin' trannies.


That bike BARKS.

GP740
Since 1987

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profeshenal125 profeshenal125
4/4/2021 8:34 PM
profeshenal125 wrote:

Sounds Great Coach529. ...more

profeshenal125 wrote:

Anyone have a 05-07 cr250 ...more

SKIDLID wrote:

Had a 98 yz 125 done by ...more

Sounds cool, with the different piston setup. Back in the 2st days, he had cr250,s and stroker crank cr125,s in magazines. He works on all makes, but back then it seemed like cr,s where his specialty.

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inthebadboycorner inthebadboycorner
4/5/2021 2:39 AM
Yz229 wrote:

Not a lot of TMR riding ...more

GeorgiePorgie wrote:

Whoever thumbed this down ...more

Why else would you blow a trannie?

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