Tom Morgan YZ315 Stroker (Red Bull Straight Rhythm)

Yz229
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378
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San Diego, CA US
8/22/2018 2:15pm Edited Date/Time 6/25/2020 6:28pm







(EDIT: Now 315cc stroker build)

First post on Vital, although been following for years. I raced a lot when I was in my teens, and 33 now. Sort of ditched dirt and got very into Sport Bikes in my 20's and even today. Right now I have a 2016 BMW S1000RR for the street.

Been missing the dirt for a long time and I moved to San Diego so get to ride year round. I've always bought new bikes, but don't have the money anymore so looked around for a cheap 2006 or newer YZ250. I found one in Yuma for less then $2,000 and it was a bit of a mess. Front brakes barely did anything, didn't run right, chain is shot...just a mess.





My old 2006 250SX I bought new with ported 300 top end.

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Yz229
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8/22/2018 2:19pm
When I got it home, I knew I had some work to do. I am so used to 200HP street bikes, it was crazy how slow it felt. My last bike was a KTM 250 SX back in 2006 and was one of the first to do the 300SX kit...had that ported, etc and it RIPPED.

Saw a lot of people going Eric Gorr but heard a lot of mixed reviews. I used Tom Morgan Racing back in my 125 days and he promised his YZ295 is much better then Erics. So I tore apart the bike to the frame. The cylinder head looked good, but the piston had signs of detonation. Possibly the previous owner just swapped heads?
Yz229
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8/22/2018 2:24pm





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Yz229
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8/22/2018 2:26pm Edited Date/Time 8/22/2018 2:28pm
Frame was really bad shape, so I used a slow spinning wire brush on the end of a drill, a Dremel and some scotch brite pads.

At this point, I wanted to re-grease everything (no pics of that) and start ordering parts! DEP works pipe, R304 shorty silencer, 2008 CRF450R front brakes, Vforce 3 reeds, new plastics, chain and sprockets, and tons of other stuff. Some of it is already on. I then found some 2018 YZ250 wheels brand spanking new, so nabbed those up and threw on!
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Yz229
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8/22/2018 2:30pm



The Shop

Yz229
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378
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San Diego, CA US
8/22/2018 2:32pm
Sorry, site seems a bit glitchy. Sometimes will only let me post 2 pics.

Yz229
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378
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8/22/2018 2:34pm


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Yz229
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San Diego, CA US
8/22/2018 2:36pm
Had to order the Tusk 270mm adapter to get the 2008 CRF450 calipers mounted. Brakes work fantastic now that it's bled with new system!

More to come. Will be cleaner posts when I get more organized. Was not expecting to be posting this to Vital, but why not!


Yz229
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San Diego, CA US
8/22/2018 3:13pm
Ordered a guts seat, blue bottom, white top and red stripes. I like the patriotic look. Also, Red Label is making the graphics and waiting for them to show. Here is the final product.

Also wanted to see how DEP pipe might look, so just threw that on to see Smile





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Pirate421
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MA US
8/22/2018 6:30pm
Looks great I’m jelous of those blue wheels I should have gone that route!
8/22/2018 7:54pm
looking good. I like those graphics. what type of riding you plan on doing?
Yz229
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San Diego, CA US
8/22/2018 9:46pm
Mostly MX, but may try some other stuff. I'm from Oregon I did all sorts of riding...MX, woods, Desert, dunes. Took it to Pala the way it looked when I first got it and it was rough!
Zesiger 112
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Pink Hill, NC US
8/23/2018 7:53am
Looking nice! You scored on those blue wheels I want some so bad. You'll love that dep pipe. Not sure how it is with a 304. I have the dep silencer on mine and love it. Did you do full brake system or just caliper?
mattyhamz2
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8/23/2018 10:12am
Looking nice! You scored on those blue wheels I want some so bad. You'll love that dep pipe. Not sure how it is with a 304...
Looking nice! You scored on those blue wheels I want some so bad. You'll love that dep pipe. Not sure how it is with a 304. I have the dep silencer on mine and love it. Did you do full brake system or just caliper?
What did the DEP do power wise??
Yz229
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8/23/2018 10:57am
Looking nice! You scored on those blue wheels I want some so bad. You'll love that dep pipe. Not sure how it is with a 304...
Looking nice! You scored on those blue wheels I want some so bad. You'll love that dep pipe. Not sure how it is with a 304. I have the dep silencer on mine and love it. Did you do full brake system or just caliper?
I did the whole front brake system, master cylinder, lines, caliper. Was a little more expensive then most, but looks almost brand new! Threw on new Honda pads, put on an adapter to fit on 270mm disk, and bled it.

Obviously haven't ridden yet but old one couldn't even slow me down even after bleeding. Probably needed a rebuild.

And yes, I love the blue wheels!
Yz229
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8/23/2018 11:18am
Still waiting on a ton of parts like cylinder/head/piston from TMR, GUTS seat, graphics. But the graphics should be here next so I decided to do a mockup and to make sure I could find all the fitting for plastics!

Anyone have any tips on cleaning the gas tank up? As you can see, pretty big color mismatch.


Yz229
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8/23/2018 11:20am
Also put new OEM tubes on carb...forgot to order the float tube...but you can kinda see the original condition of them!



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mattyhamz2
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8/23/2018 11:24am
Bikes going to look awesome man. A lot of time and money but it will be worth it
Yz229
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8/23/2018 11:31am
Thanks man! For sure lot's of time and money, being awesome still up in the air. This is my first time doing a full tear down and rebuild, but I sure do enjoy it!
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Zesiger 112
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8/23/2018 11:32am
mattyhamz2 wrote:
What did the DEP do power wise??
Everything you read about is true. Good roll on power, no peaks or valleys through the rpm, and will rev to the moon. Hold it in a gear way past where you would think to shift and it will just keep pulling. but it doesn't give up anything on a short shift either.
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Yz229
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San Diego, CA US
8/23/2018 11:38am Edited Date/Time 8/23/2018 11:39am
I won't know on DEP for sure unless I do back to back comparison to stock pipe. Going from 100% stock bike with worn top end, clogged stock silencer with 15/45 gearing...yes 15/45 previous owner had.

Now it will have Tom Morgan 295cc ported, milled head, DEP Pipe, R304 silencer, Vforce Reeds, 11oz FWW, stock gearing (14/50).

I'm sure it will be night and day difference. May do stock pipe comparison some day, but results may be moot since most aren't running Tom Morgan 295cc.
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cdoggy81
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St. Petersburg, FL US
8/23/2018 12:00pm Edited Date/Time 8/25/2018 11:55am
Nice build Smile
With a TMR 295 you may even gear down to a 14/49...
What made you go 295 vs the 265?
Yz229
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San Diego, CA US
8/23/2018 12:16pm
cdoggy81 wrote:
Nice build Smile
With a TMR 295 you may even gear down to a 14/49...
What made you go 295 vs the 265?
My last bike was a KTM 250 SX that I threw on a 300cc cylinder (before KTM made the official kit). I had it done up by Clay at Munn Racing and it was super fast, and very easy to ride.

Kind of wanted to mimic that style if I could. I talked to Tom and he said the obvious, the 265 will rev a little free'er. The top end should be the same, but of course with added displacement will get better bottom to mid. He recommended the 285cc stroker, or even 315cc stroker but that was way too much money right now.

Also been riding/racing 1000cc Sport Bikes and now everything feels super slow so wanted more pep. I know, very apple to oranges. But I'm also a super nerd and just like trying things different Smile
chase32
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8/21/2018
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Keller, TX US
8/23/2018 12:52pm
Looking good, can't wait to see it finished!
Yz229
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378
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San Diego, CA US
8/23/2018 1:32pm
Tried a little magic eraser, and goof off to help clean up tank. It's been drained of gas for awhile. I guess most of it will be covered by graphics, but a lot is still exposed. Before and after of 15min clean up job...



5
Lightning78
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Huntington Beach, CA US
8/25/2018 4:18am
mattyhamz2 wrote:
What did the DEP do power wise??
Everything you read about is true. Good roll on power, no peaks or valleys through the rpm, and will rev to the moon. Hold it in...
Everything you read about is true. Good roll on power, no peaks or valleys through the rpm, and will rev to the moon. Hold it in a gear way past where you would think to shift and it will just keep pulling. but it doesn't give up anything on a short shift either.
I wonder if I could get a pipe like that for my 03 kx250 lol it sure could use a top end overrev boost
mattyhamz2
Posts
9973
Joined
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Location
So Cal, CA US
8/25/2018 8:34am
mattyhamz2 wrote:
What did the DEP do power wise??
Everything you read about is true. Good roll on power, no peaks or valleys through the rpm, and will rev to the moon. Hold it in...
Everything you read about is true. Good roll on power, no peaks or valleys through the rpm, and will rev to the moon. Hold it in a gear way past where you would think to shift and it will just keep pulling. but it doesn't give up anything on a short shift either.
I wonder if I could get a pipe like that for my 03 kx250 lol it sure could use a top end overrev boost
Have you tried a PC pipe with a 304 silencer?
Zesiger 112
Posts
2042
Joined
3/4/2013
Location
Pink Hill, NC US
8/25/2018 7:14pm
mattyhamz2 wrote:
What did the DEP do power wise??
Everything you read about is true. Good roll on power, no peaks or valleys through the rpm, and will rev to the moon. Hold it in...
Everything you read about is true. Good roll on power, no peaks or valleys through the rpm, and will rev to the moon. Hold it in a gear way past where you would think to shift and it will just keep pulling. but it doesn't give up anything on a short shift either.
I wonder if I could get a pipe like that for my 03 kx250 lol it sure could use a top end overrev boost
From my understanding the key to top end on a 250 is a long silencer. Pc is known for making top end pipes, so maybe get the long silencer and not the shorty and you will benefit from top end and smoother bottom.
For reference here is the dep silencer on my bike.

H4L
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CA US
8/25/2018 7:35pm
From my understanding the key to top end on a 250 is a long silencer. Pc is known for making top end pipes, so maybe get...
From my understanding the key to top end on a 250 is a long silencer. Pc is known for making top end pipes, so maybe get the long silencer and not the shorty and you will benefit from top end and smoother bottom.
For reference here is the dep silencer on my bike.

The engine design & oem porting specs play a factor in it as well. The YZ & KX 250 2t's were more of a low to mid powerband engine vs. the CR & RM in comparison. A PC pipe will help a little, but if the rider is looking for more up top changing the port timing will make a bigger difference.
Yz229
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378
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8/22/2018
Location
San Diego, CA US
8/26/2018 6:24pm
Never noticed a huge difference from 304 to R304, except I like the extra bark and sound from R304. Tom Morgan assured me it wouldn't be huge anyways and his timing would be all the difference.

Bunch more parts coming in next week as well. Also trying to decide who to do for suspension, Precision Concepts or Enzo...hmmm.

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