2019 SX150 Lightweight Build Questions

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5/10/2018 5:47 AM

I'm a 43 year old Vet Intermediate rider. Was riding a 16.5 450 Factory Edition. Spent about two hours on my son's 17 SX125 and realized I needed a SX150. The small two strokes are so much fun!!

Anyway, my 450 is on Craigslist and I will be buying a 19 SX150 as soon as they are available. Performance-wise I will be installing immediately:

-Cone Valve AER forks - Had them on the 450, will move the 150
-Bladder conversion on shock by Billy at Powerband
-Lectron carb - have this on my son's 125, jetting is spot on
-VForce 4R reeds
-Michelin Starcross 5 tires - currently running Dunlop MX3S, I believe the Starcross 5's are lighter

The question is, if you had $1,000 to spend on making the SX150 lighter, what are the mods you would purchase?? This is not a money-is-no-object build, but a bang-for-the-buck build.

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5/10/2018 5:54 AM

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5/10/2018 6:06 AM
Edited Date/Time: 5/10/2018 6:09 AM

Why not just answer the question? If you can't why not keep quiet? Why do you have to be cynical about the thread - simply because it is a new user and doesn't have half a million posts like some? The amount of people who ruin threads is just stupid.


As for lightness - doing a light build is on my bucket list. I would say one of the best ways is to go for one of those superlight seat foams (I would personally make my own). Beyond that, I'm not sure what would be considered best bang for the buck when it comes to decently priced weight loss.

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5/10/2018 6:11 AM

Dump it in unsprung weight.

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5/10/2018 6:15 AM

.kyle wrote:

Why not just answer the question? If you can't why not keep quiet? Why do you have to be cynical about the thread - simply ...more

Relax man. He is coming from a 450 to possibly one of the lightest bikes out there. From one end of the spectrum to the other. The 150SX is already mad light.

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5/10/2018 6:19 AM

"If you had $1000 to spend"

"Money is no object"

.......

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5/10/2018 6:28 AM

Carbon fiber silencer and titanium brake rotors!

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5/10/2018 6:28 AM

Spend 1000 on a personal trainer and loose 10 lbs

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5/10/2018 6:37 AM

rmoto003 wrote:

"If you had $1000 to spend"

"Money is no object"

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Read the thread again - "This is not a money-is-no-object build".

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5/10/2018 6:38 AM
Edited Date/Time: 5/10/2018 6:39 AM

Full Think Seat probably best $$ to weight ratio.

Probably swapping the big pivots bolts/axles to Titanium

Carbon or titanium silencer

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5/10/2018 6:50 AM

Light weight mountain bike tubes.

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5/10/2018 6:50 AM
Edited Date/Time: 5/10/2018 7:04 AM

AgileMike wrote:

I'm a 43 year old Vet Intermediate rider. Was riding a 16.5 450 Factory Edition. Spent about two hours on my son's 17 SX125 ...more

I have an 18 150SX and it already is extremely light. I have replaced a lot of the 8 and 10mm bolts with titanium mainly because I hate the looks of the dull grey KTM bolts (even though they are really light too) you could swap out the pipe and silencer for about 1lb loss, Ti shock spring 1.5lbs, lightweight seat foam another 1lb, find the lightest set of tires around 1lb. Other than that, not really sure what else you could do besides spending big money on Ti axles. The WP AER48 forks are already 3.8lbs lighter than the 4CS so if you are planning on addiding the CV forks on there you are already gaining a few lbs.

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5/10/2018 6:51 AM
Edited Date/Time: 5/10/2018 6:52 AM

Seatfoam think or guts. I love my guts seat!
Guts 200gram for 200 bucks..
get a gripper seatcover and drill the seat base

Fatbike innertubes (unsprung/rotational)

And still 750 bucks left cool

For 750 you"ll get a titanium rear spring. Dont december the Weight difference on mine tough.

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5/10/2018 6:59 AM

It would be cool if someone went full out on a 125 or 150 reducing weight. and see what it ends up at

Rocky Mountain retails a bunch of TI stuff like foot pegs and bolts.

Eliminate the plastic gram guards can save you weight. Probably next to nothing tho. You could also delete the ecu mount and zip tie it... not smrt but reduces weight

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5/10/2018 7:00 AM

It would be cool if someone went full out on a 125 or 150 reducing weight. and see what it ends up at

Rocky Mountain retails a bunch of TI stuff like foot pegs and bolts.

Eliminate the plastic frame guards can save you weight. Probably next to nothing tho. You could also delete the ecu mount and zip tie it... not smrt but reduces weight

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5/10/2018 7:10 AM

You can also cut out the battery tray above the airbox for a small save since it's shared with the 4 strokes

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I'm not an actual kid
Red Bud Vet Fest 2020: https://www.youtube.com/watch?v=3gpxS0KgQFc

District 14
2017 KTM 150

R.I.P. Steel City

5/10/2018 7:13 AM

I would invest in a strict diet and and a Concept 2 rower.

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5/10/2018 7:16 AM

ThatOneKid wrote:

You can also cut out the battery tray above the airbox for a small save since it's shared with the 4 strokes

FYI I weighed mine when I trimmed it for the hell of it and it saved 2 ounces.

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5/10/2018 7:35 AM

Kawasaki-rider wrote:

Seatfoam think or guts. I love my guts seat!
Guts 200gram for 200 bucks..
get a gripper seatcover and drill the seat base

...more

I’d agree with the light seat foam and tubes. I tried the tubes but felt felt I had no traction, not sure if it was just me that day...

Carbon silencer from Bud racing is really sick.

Cut out all the extra plastic in the air box area.

Run 3/4 take of gas if you do less than 10 laps per moto

Ti footpegs.

You can easy do all that for $1k.

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5/10/2018 8:02 AM

Pipe and silencer.

Ti shock spring.

And someone mentioned mountain bike tubes

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5/10/2018 8:07 AM

cameron96 wrote:

It would be cool if someone went full out on a 125 or 150 reducing weight. and see what it ends up at

Rocky Mountain retails ...more

Look up my cr 125 buildthread wink slow progress though.

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5/10/2018 8:32 AM
Edited Date/Time: 5/10/2018 8:36 AM

get an older model that has the 200cc engine in, and then fix the other stuff...as good as the 150s are, my 220 is just a killer engine thats kdx. but someone was doing a killa build with and old 200 ktm engine in a late nodel 125/150 chassis.....you will never regret taking that path, 125/150s require a whole shittload of shifting and ckutching, the 200s dont..but the fun factor is still there

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5/10/2018 8:33 AM
Edited Date/Time: 5/10/2018 8:36 AM

Here is the mods i did to get light weight sx250. Around 200 lbs

Front pipe : Pro circuit lighter than stock
Silencer : Bud carbon , but currently use pc titanium at 880grams
TMD Chainguide
Chain: the type thats drilled
Seat foam : Think!
Forks:Used PSF1 , but switched to Ohlins. ( lighter than the 2011 CC Forks)
Shock:Use Ohlins rear shock it was alot lighter than the stock
Tires Pirelli mx3s or what they are called


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5/10/2018 10:34 AM

Marchesini wheels. They’re 32 spoke, no nipples and the lightest on the market.
Michelin or Pirelli mid-softs
Motion Pro rim tape and Lite-Loc’s
Talon sprockets, Sunstar MXR1 chain
PC pipe/carbon silencer
GUTS seat
Ti rear spring ($$$)
Aluminum fasteners wherever you can get away with it
Carbon fiber chain guide
Remove extra material where possible like skid plate, frame guards, caliper guard, airbox material, and don’t add weight back on with heavy graphics kits etc. You can get preprinted backgrounds from some venders on a thinner vinyl than normal.

After this stuff it starts to get pretty expensive for the amount of weight you’re going to shave.

The guys who say take a dump, work out, go on a diet, blah blah blah just don’t get it. It is possible to do all of that stuff and want your bike to be as light on possible at the same time.

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5/10/2018 12:12 PM

nytsmaC wrote:

Marchesini wheels. They’re 32 spoke, no nipples and the lightest on the market.
Michelin or Pirelli mid-softs
Motion Pro rim ...more

Just out of curiousity nytsmaC, how do you know that the Marchesini wheels are the lightest on the market? Are you saying the same thing regarding the Talon sprockets and Sunstar MXR1 chain?

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5/10/2018 12:50 PM

As mentioned tire tube combination will save the most weight for least $.

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5/10/2018 1:05 PM

Tires tubes sprockets and those plastic rim locks.
I wonder why no one runs a TI chain. The chain is a few pounds I bet you could cut weight with TI it's unsprung and rotating mass. You may even feel a difference.

I know you can feel those gimmick o ring chains drag you down. Its stupid that you buy an o ring chain then you always loose a tooth on your front sprocket first no matter what chain or rear sprocket you get. Then you replace everything.

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5/10/2018 1:08 PM
Edited Date/Time: 9/8/2018 10:06 AM

.kyle wrote:

Just out of curiousity nytsmaC, how do you know that the Marchesini wheels are the lightest on the market? Are you saying the ...more

The Marchesini’s are the only 32 spoke aftermarket offering that I’m aware of, and not having spoke nipples around rhe circumference of the rim will add up too.. and they claim to be the lightest, which is easy to believe due to the design.

The chain is the lightest according to MXA, who compared all of the major players in an article a few years back. It’s the same ultra bright chain as the DID you see on a lot of the pro team bikes.

The sprockets i cannot confirm but look at the design and you’ll see why it’s pretty safe to assume that they are the lightest.

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5/10/2018 1:10 PM

I have a ti pc silencer on mine and weighed it along with the stocker to see what the difference was. I’ll see if I can find my notes and report back. Probably not the best pound/dollar weight reducer though.

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5/10/2018 1:18 PM

O ya, my Bud racing pipe and carbon silencer dropped a pound or 2 on my 250sx. I can check at home the exact numbers.

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