KX150-AF 2016

JimmyOberg
Edited Date/Time 5/27/2016 10:07am
Hi, thought I could share my new build with you.

This will be a version 2 of my earlier build:



Here I have used a KX250F 2010 frame, 2013 subframe. I've had the bike like this for 2 years and ben planning an update for a while.... I'm not a big fan of the extra length welded to the rails so I had new rails bent for the new frame.



Last race of the year I had this happend:




So now I will have the engine rebuilt with some changes from last year.

Starting to work with the new frame I got, KX250F 2014









And here is the finished frame



Now I'll start to assembly it. Feel free to ask if you have any questions!

Regards, Jimmy


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JimmyOberg 11/14/2015 2:32pm
11/14/2015 2:32pm Edited Date/Time 11/23/2015 12:19pm
Today I got the Ti footpegs in place









Started to have a look at the rear brake lever as well, but I'm waiting for a silver anodized tip for it.



Next I will munt the Xtrig triple clamps, but I'm waiting for new bearings for it. As soon as I get them I should be able to mount the whole front end!

colintrax
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colintrax 11/14/2015 2:39pm
11/14/2015 2:39pm
You said it's a 150, so bored or stroked? Did you port it?
romain524
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romain524 11/14/2015 2:52pm
11/14/2015 2:52pm
Sick boy!! I follow this project a lot! And when it will be finished I will share on my Facebook page "125 ONLY 2 Stroke" I really like it!
JimmyOberg 11/14/2015 2:54pm
11/14/2015 2:54pm
colintrax wrote:
You said it's a 150, so bored or stroked? Did you port it?
Running 58mm bore so its actually a 144cc.

Ported mid-top by PBR racing here in Sweden, Vertex KTM flat head piston, VHM head with 13.40cc insert, V-force 2 reeds and a Keihin 38mm PWK airstryker carb. HGS 144 exhaust.

New for next year will be a VHM high inertia crank balanced with the heavier piston.

The Shop

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nascarnate326 11/14/2015 4:08pm
11/14/2015 4:08pm
Very cool!!!! Going for a black or green theme?
JBernard_401
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JBernard_401 11/14/2015 4:12pm
11/14/2015 4:12pm
looking good.
nice shop too!
pCp 252
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pCp 252 11/14/2015 5:33pm
11/14/2015 5:33pm
What bend renthals are you running in the first pic?

JimmyOberg 11/15/2015 12:51am
11/15/2015 12:51am
pCp 252 wrote:
What bend renthals are you running in the first pic?

It's the 999 bend.
Crush
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Crush 11/15/2015 12:56am
11/15/2015 12:56am
Awesome! Thanks for sharing!
jock
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jock 11/15/2015 1:17am
11/15/2015 1:17am
Very nice build. Smile
HenryA
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HenryA 11/15/2015 2:05am
11/15/2015 2:05am
Cool, you last bike was awesome. Can't wait to see how this one turns out!
Markopolo400
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Markopolo400 11/15/2015 8:51am
11/15/2015 8:51am
Droooollllll
lumpy790
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lumpy790 11/15/2015 8:55am
11/15/2015 8:55am
unique .... I like it!
coastlinecascott 11/15/2015 9:11am
11/15/2015 9:11am
To the life of me why doesnt the factories build these. Cheap to produce and will sell to the poor none racer.
Olson
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Olson 11/15/2015 9:20am
11/15/2015 9:20am
Very very cool as always!
JimmyOberg 11/15/2015 12:06pm
11/15/2015 12:06pm Edited Date/Time 11/23/2015 12:21pm
Thanks for the comments! I'll try to keep you updated. Here comes a small one

Wheels will be stock KX250F. The goal is to get it together below 90kg and getting wheels that are lighter than stock gets really expensive.



I'm not a big fan of the feel of the stock floating brake disc in the front so I mounted a Braking disc that is a lot lighter as well.









More to come...

ginger969
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ginger969 11/15/2015 12:22pm
11/15/2015 12:22pm
mmmmm wow Smile
TeamGreen
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TeamGreen 11/15/2015 1:31pm
11/15/2015 1:31pm
Really nice work!

You can lace up a 1.85 X 19 rear rim and run the lighter tires intended for a 125 (the smaller profile tires). Also, you can turn down your Hubs like they do at TCR. Stock spokes & nipples are pretty damn light already.

Since its a 125, you can probably have the rear brake rotor drilled a little more and lighten it up, too. You can remove 30-50% of your brake pad material for weight savings, too. 125s usually require a lot less rear brake force.

Guts Racing seat foam is available in "light-weight", too.

Pit Row

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JimmyOberg 11/15/2015 1:54pm
11/15/2015 1:54pm
TeamGreen wrote:
Really nice work! You can lace up a 1.85 X 19 rear rim and run the lighter tires intended for a 125 (the smaller profile tires)...
Really nice work!

You can lace up a 1.85 X 19 rear rim and run the lighter tires intended for a 125 (the smaller profile tires). Also, you can turn down your Hubs like they do at TCR. Stock spokes & nipples are pretty damn light already.

Since its a 125, you can probably have the rear brake rotor drilled a little more and lighten it up, too. You can remove 30-50% of your brake pad material for weight savings, too. 125s usually require a lot less rear brake force.

Guts Racing seat foam is available in "light-weight", too.
Thanks! The rear wheel already is 1.85.

In front I run Pirelli MX32 3640g... 200 grams lighter than Dunlop MX51 (3840)

Rear 100/90 19" Pirelli 4815g, vs Dunlop 5068g

For seat I been looking at the Think Technology foam that should save 660g(!!!) over stock. Thats a huge win high up on the bike.



.kyle
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.kyle 11/15/2015 1:59pm
11/15/2015 1:59pm
MotionPro Lite rim lock as well to reduce weight?

I'm surprised people don't make their own light weight seats. Would imagine it'd be a good bit cheaper.
F150Motocrosser 11/15/2015 3:58pm
11/15/2015 3:58pm
Awesome build! Great work, keep the updates coming.
Silliker269
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Silliker269 11/15/2015 4:17pm
11/15/2015 4:17pm
Killer , if I could pick any bike that would probably be it
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xr70 11/15/2015 5:40pm
11/15/2015 5:40pm
Nice project, I like it !
Awesome Johnson 11/15/2015 6:21pm
11/15/2015 6:21pm
Killer job on the frame mod Jimmy! Keep up the good work. Love these kind of builds
Nesc39
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Nesc39 11/15/2015 6:26pm
11/15/2015 6:26pm
The quality and craftsmanship are amazing but what's up with the whole weight saving thing. Seriously? Sorry guys but your wasting your time. Shaving off grams from your brake pads...lol. Your bike 2 pounds lighter isn't gonna change a thing. I'll fill your tires with lead and you won't know the difference. Better order that 8000$ Ti bolt and axle kit and only fill your gas tank 1/8тh full. 8 pounds a gallon! Yikes
Nesc39
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Nesc39 11/17/2015 6:01am
11/17/2015 6:01am Edited Date/Time 11/17/2015 6:48am
TeamGreen wrote:
Really nice work! You can lace up a 1.85 X 19 rear rim and run the lighter tires intended for a 125 (the smaller profile tires)...
Really nice work!

You can lace up a 1.85 X 19 rear rim and run the lighter tires intended for a 125 (the smaller profile tires). Also, you can turn down your Hubs like they do at TCR. Stock spokes & nipples are pretty damn light already.

Since its a 125, you can probably have the rear brake rotor drilled a little more and lighten it up, too. You can remove 30-50% of your brake pad material for weight savings, too. 125s usually require a lot less rear brake force.

Guts Racing seat foam is available in "light-weight", too.
Seriously? Shave you brake pads to save weight? Is this a sideshow?
If the op only goal is to spend 30,000$ just to see if he can build a 90kg bike then awesome have a blast. If he doing this because he thinks he gonna notice it on the track then he gonna be sad.
Im not trying to pick on just you. I see factory mechanics drilling washers to save 1 gram off a bike. It's so rediculous. There is NO WAY anyone is noticing a gram, or an even a few ounce. The first piece of dirt that sticks to your fender and your weight savings are all over.
To all the boneheads that are gonna tell me " of course I notice the weight." It must kill you to run a new tire huh? Going from a nice light worn out carcass to a fresh knob!
If someone else has a buddy claiming he notices his bike being lighter here's the best way to call bullshit. TOP OFF HIS GAS TANK. Gas is approx 8 pounds a gallon so he will be a fish out of water when he gets a fill up.

I think the craftsmanship and quality is amazing I just don't see the point of some of the work
Uncle Tony
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Uncle Tony 11/17/2015 6:28am
11/17/2015 6:28am
Nice job Oberg
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mxtech1 11/17/2015 7:25am
11/17/2015 7:25am
I'd like to see more pictures of your shop!
Cygnus
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Cygnus 11/17/2015 7:31am
11/17/2015 7:31am
TeamGreen wrote:
Really nice work! You can lace up a 1.85 X 19 rear rim and run the lighter tires intended for a 125 (the smaller profile tires)...
Really nice work!

You can lace up a 1.85 X 19 rear rim and run the lighter tires intended for a 125 (the smaller profile tires). Also, you can turn down your Hubs like they do at TCR. Stock spokes & nipples are pretty damn light already.

Since its a 125, you can probably have the rear brake rotor drilled a little more and lighten it up, too. You can remove 30-50% of your brake pad material for weight savings, too. 125s usually require a lot less rear brake force.

Guts Racing seat foam is available in "light-weight", too.
Nesc39 wrote:
Seriously? Shave you brake pads to save weight? Is this a sideshow? If the op only goal is to spend 30,000$ just to see if he...
Seriously? Shave you brake pads to save weight? Is this a sideshow?
If the op only goal is to spend 30,000$ just to see if he can build a 90kg bike then awesome have a blast. If he doing this because he thinks he gonna notice it on the track then he gonna be sad.
Im not trying to pick on just you. I see factory mechanics drilling washers to save 1 gram off a bike. It's so rediculous. There is NO WAY anyone is noticing a gram, or an even a few ounce. The first piece of dirt that sticks to your fender and your weight savings are all over.
To all the boneheads that are gonna tell me " of course I notice the weight." It must kill you to run a new tire huh? Going from a nice light worn out carcass to a fresh knob!
If someone else has a buddy claiming he notices his bike being lighter here's the best way to call bullshit. TOP OFF HIS GAS TANK. Gas is approx 8 pounds a gallon so he will be a fish out of water when he gets a fill up.

I think the craftsmanship and quality is amazing I just don't see the point of some of the work
Race gas weighs in at about 6.0-6.4 lbs a gallon. Water weighs 8
.kyle
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.kyle 11/17/2015 8:07am
11/17/2015 8:07am
Nesc39 wrote:
Seriously? Shave you brake pads to save weight? Is this a sideshow? If the op only goal is to spend 30,000$ just to see if he...
Seriously? Shave you brake pads to save weight? Is this a sideshow?
If the op only goal is to spend 30,000$ just to see if he can build a 90kg bike then awesome have a blast. If he doing this because he thinks he gonna notice it on the track then he gonna be sad.
Im not trying to pick on just you. I see factory mechanics drilling washers to save 1 gram off a bike. It's so rediculous. There is NO WAY anyone is noticing a gram, or an even a few ounce. The first piece of dirt that sticks to your fender and your weight savings are all over.
To all the boneheads that are gonna tell me " of course I notice the weight." It must kill you to run a new tire huh? Going from a nice light worn out carcass to a fresh knob!
If someone else has a buddy claiming he notices his bike being lighter here's the best way to call bullshit. TOP OFF HIS GAS TANK. Gas is approx 8 pounds a gallon so he will be a fish out of water when he gets a fill up.

I think the craftsmanship and quality is amazing I just don't see the point of some of the work
"I just don't see the point of some of the work".....pushing the boundaries? Seeing what is possible?

It bugs me somewhat when people chime in with "what's the point". If someone has a project/idea of doing something, then more power to them. If you don't see the point in what someone is doing, then why say anything? Keep it to yourself and let them happily carry on.

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