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Our YZ125 needed some repair after sucking some dirt and some questionable gas. Vertex Piston and Millennium fixed up the parts like new. While we were at it, we added a few mod parts to give us a bit more grunt in the motor. Watch the video to see David Pingree shred on the freshly tuned bike, and see below for all the parts used.
Vertex Pistons www.vertexpistons.com 515-270-2302
Pro Replica Piston kit (ring, pin and clips) 23119B $117.33
Millennium Tech www.mt-llc.com 920-893-5595
Strip, re-pair damage and re-plate to stock size $229.95
Cylinder head repair $52.45
Normal turnaround is approx 7 working days in house not including transit time.
Cometic Gasket www.cometic.com 800-752-9850
Top End engine gasket kit C3105 $ 33.17
FMF Racing www.fmfracing.com 310-631-4363
Fatty chrome exhaust $229.99
Shorty Silencer $119.99
MotoTassinari www.mototassinari.com 603.298.6646
V-Force Reed Cage $148.00
Motosport Outlet www.motosport.com 888-676-8853
All mod parts are available directly from motosport.com at even more
Optional performance parts
Uni Filter www.unifilter.com 714-535-6933
Air Filter NU-3230ST $29.95
Renthal www.renthal.com 877-736-8425
Stock front and rear sprocket $25.95 and $64.95 for the rear.
R1 Works Chain $81.95
997 Twin Walls $119.95
Original grips $12.95
Dunlop Tire www.dunlopmotorcycle.com 800-845-8378
MX 71 front 90/100-21 $102.79
MX 51 rear 100/90-19 $111.19
DeCal Works ww.decalmx.com 815-784-4000
Semi-Custom Graphics kit $199.95
Pre printed number plates backgrounds $69.95
Moto Seat www.motoseat.com 951-258-5229
Custom Cool seat cover
Works Connection www.worksconnection.com 1-800-349-1475
Elite Perch Body $79.95
Elite Perch Thumbwheel $37.95
Elite Perch Lever $37.95
Factory II Stand $99.95
Front Billet Brake cap $27.50
Rear Billet Brake cap $24.95
Radiator Braces $69.95
Axle Blocks $49.95
Oil filler Plugs $24.95
Rotating Bar Clamp $27.50
Frame Guard Pr. $65.00
Silkolene www.silkoleneusa.com 817-581-8616
Lubricants and Oil
Vertex Pistons www.vertexpistons.com 515-270-2302
Pro Replica Piston kit (ring, pin and clips) 23119B $117.33
Millennium Tech www.mt-llc.com 920-893-5595
Strip, re-pair damage and re-plate to stock size $229.95
Cylinder head repair $52.45
Normal turnaround is approx 7 working days in house not including transit time.
Cometic Gasket www.cometic.com 800-752-9850
Top End engine gasket kit C3105 $ 33.17
FMF Racing www.fmfracing.com 310-631-4363
Fatty chrome exhaust $229.99
Shorty Silencer $119.99
MotoTassinari www.mototassinari.com 603.298.6646
V-Force Reed Cage $148.00
Motosport Outlet www.motosport.com 888-676-8853
All mod parts are available directly from motosport.com at even more
Optional performance parts
Uni Filter www.unifilter.com 714-535-6933
Air Filter NU-3230ST $29.95
Renthal www.renthal.com 877-736-8425
Stock front and rear sprocket $25.95 and $64.95 for the rear.
R1 Works Chain $81.95
997 Twin Walls $119.95
Original grips $12.95
Dunlop Tire www.dunlopmotorcycle.com 800-845-8378
MX 71 front 90/100-21 $102.79
MX 51 rear 100/90-19 $111.19
DeCal Works ww.decalmx.com 815-784-4000
Semi-Custom Graphics kit $199.95
Pre printed number plates backgrounds $69.95
Moto Seat www.motoseat.com 951-258-5229
Custom Cool seat cover
Works Connection www.worksconnection.com 1-800-349-1475
Elite Perch Body $79.95
Elite Perch Thumbwheel $37.95
Elite Perch Lever $37.95
Factory II Stand $99.95
Front Billet Brake cap $27.50
Rear Billet Brake cap $24.95
Radiator Braces $69.95
Axle Blocks $49.95
Oil filler Plugs $24.95
Rotating Bar Clamp $27.50
Frame Guard Pr. $65.00
Silkolene www.silkoleneusa.com 817-581-8616
Lubricants and Oil
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Check out LAST NIGHT
in our Latest issue of Racer X available now.Ryan Villopoto may have locked up his 450SX title a week early, but the 2013 Monster Energy Supercross Championship finale still had drama and excitement to spare. Page 124.
Look for the verified symbol 




Blow up a 2-stroke? A couple hundred bucks and a few hours and it's good as new...or better. Blow up a thumper? Well, let's just say there's no incentive for the manufacturers to promote 2-strokes.
2 stroke- the sweet sound of controlled aggression
4 stroke- a sound sort of like Rosanne Barr after the double nachos at Chili’s.
Moreover, finally, RacerX is getting real about the sport, not just the cost but the transition issue for kids.
Nice job Ping.
decided last year that since im not racing anymore i'm going back to 2-strokes full time. i was leanging toward a new ktm 150 but saving a ton of cash and rebuilding a used yz15 might be fun too
I have a 125sx that I love, but my bike never did anything like that with my fat butt crushing the life out of my shock. Something to be said for skill perhaps? Maybe I need to lose some weight, take a motocross class, get focused...
...or maybe I could just pretend that was me and eat some Doritos as a reward for my apparently bodacious skills.
mmmm - Love that tangy goodness.
after blowing up and spending way too much on the 4 strokes i'm switching back to a 2 stroke, honestly 4 strokes are great, but they are handicapping the sport.
My friend wanted to start riding and got a 98CR125 for $800. Flat front tire, back tire smoked, headgasket leaking so bad that it would pump the radiator dry, etc... He's got $1300 in it now and it runs pretty decent. Drag raced a 2009 KTM250SX and held him off through the first 3 gears. Not too bad for a dinosaur.
You guys did such a good job with that video, exposing the 2-stroke for what it is. The most fun, affordable way to ride.
The more exposure the 125 and 250 2-strokes get, the more things will change in amateur racing to the amateurs benefit.
Thanks.
I could almost smell the Klotz as you were making your passes Dave.
I always owned 250, 2 strokes, but I sure did enjoy jumping on a 125 now and then to make you actually feel like you could really ride...
Brings a tear, to my one good eye! Whaaa
Thanks for the article Ping. You are right, if anybody out there wants to get in this sport for the first time or is tired of bustin your wallet on the 4t this is the way to go. Wether you ride practice days or do the occasional race, you can be very competitive and have a blast while you are at it. My 2009 YZ250 has never given me any problems keep the filter clean, preventitive maintenance and keep the bike clean,has given me nothin but fun. I do not understand the "not so big four" killing the 2t. Thank you KTM for continuing 2t development. My next bike will be a Katoom.
Long live smokers!
the bike shure looks good. The house and track look even better. Boy i wish i
could have a track in my back yard. Does anyone know where that track is and is it for sale??????The pool is sick
Damn, Ping rips on the 125 -- good stuff.
I have a 2006 YZ 125 that has all the good parts listed plus a 144 Athena big bore kit. This bike is the most fun you can have in the dirt! I haven't been able to think of one good reason to replace this bike. Thanks for spreading the word PIng!
41 years old, grew up on 2 strokes, have been riding honda 250f's since 05 currently have 2010 crf awesome bike, but i just bought 07 cr125 sent it to Forward Motion, Eric built me a mid to top 144 and wow!! this thing rips, I smile so big when I ride it I don't know why my helmet shell does not break, Less than 3k in everything, bike, big bore, new bottom end parts, chain, sprockets,w/c perch and 2 new dunlops and other stuff im sure I forgot, bottom line not a bucks and a huge bang, fresh air cleaners some yamalube R = hours of excitement, looks like the 4spanker is gonna collect some dust for a while.
that was awesome! i want a 125 again...thanks ping and racerx!
Would be nice if you guys could test a Husqvarna CR125 2-stroke as well. Very curious about what ping thinks of it. Cheers!
ill take the 4 stroke.
all day every day
Can't see any video posted.
oldmoto - this might help
http://www.vitalmx.com/forums/Moto-Related,20/RacerX-Films-not-Available,1239128
Bought a 125SX this year, and still own it, yes it is fun. But my 350 makes me feel safer. Maybe after riding a 4 stroke for the last 10 years my style has changed. I just don't feel comfortable jumping the 125, but love holding it wide open in turns.
AMA Pro Racing should be 3 classes like back in the day. It could easily be 125/250/450 125 and 250 classes would obviously be dominated by two strokes based on their natural superiority. 125 class (two stroke only) 250 class could allow 350 four strokes and the 450 class would be four stroke only so the manufacturers don't lose out on the development dollars they've spent over the last decade. Lose the Women's class at the nates and add a 125 class. Could be a low budget support class and a good step between 85s and the overpriced 250 four stroke class.
The sound of a 125 is the best. I have always liked the blue of Yamahas but god do I hate that plastic. The 250F and 450F plastic looks ok but the 2 strokes could use a bit of a revamp!
I was a two stroke freak! Fell for the four strokes with an '85 xr350r, moved up to an '03 CRF450r,and moved even further up by switching BACK to an '95 CR250r,yes I said "further up",as this CR250 has made me realize that the cost of maintaining,or the dreaded rebuild after a grenade goes off in the engine is WAY more than what it should cost to try and compete in today's racing. Is it the latest and greatest?,no,but it was good enough for Henry and McGrath,so it does just fine for me! Unfortunately I recently crashed into a tree on it,the bike is fine,but the way my spine ended up means I will never swing a leg over a dirt bike again,I still love to sit in my shop and stare at it though!