Well after seeing some other projects its time to start - started mocking up the motor tonight - fits pretty well and mucho room for exhaust port unlike yz250 motor - its going to be a busy winter - mock it up, cut off lower motor mounts and reweld and fab up some more engine mounts get everything set, clean powdercoat frame swingarm, etc - ive got 4-5 months!



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your 125 a steel frame? you should be using a 250f frame if anything ( no shortage of blown up 250f's being parted out and frames are cheap on e-bay, or get a 125 05-06), they shove 500's in those, and you're wasting your time , yamaha's frame flex makes it a uncompetitive sumo anyway

Ive got the frame already and the 06 250-450 frames are the same + not a sumo bike a dirty, my 250 will be sumo!

got stuff back from powder coating starting mock up!

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From 2012 - 2014 .. Dude you need a faster powercoater

Haha at Ohfugit. Looks good Tony, I am not very motovated to work in my cold garage hence the reason on no update on my build. LOL

Motivate your credit card to purchase a heater .

Heater isn't the issue. The issue was getting it booked up before the winter. No way I'm cutting holes in my roof in the winter.

Maybe use an ''electric'' heater ?

Ive got a mr buddy propane i use in the garage and it heats it up good but i just wanted to put it on the frt porch as its easier and i can walk back and forth and watch tv or listen to tunes and be by the kids. its nice at 1 am on friday night in my pjs workin on my shit!

What's the deal with using a 250 or 450f with a yz 250 two stroke motor? I just found out that my blow motor has a fully ported sweetech cylinder while @ Millenium. My sell yz250 with a stock cylinder and find a used f chassis to build up a nice ice ride for next year...

If Anyone needs a spare Yz 450 swing arm and frame I have one for sale. Its left over from my race bike part out.

Had spare shit lying around and wanted to see if i could do it + modern aluminumn fram with steel chassis 125 mtr.

Fyi. The 05+ Al stamped frame is actually heavier than the steel chassis. I looked into this before picking up my yz. Asked the same Q on thumpertalk & the only explanation was that it looks cooler & that yamaha stopped frame dev. On the yz after 06...

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are you referring to the YZ125-250 aluminumn frame as its way different then the 2006-2009 yz450f frame. from my understanding the yz450f frame is lighter then the original 99' yz125 frame. If everything comes together good i should have a 180lb 40hp missle! power to weight equal to a 2009 yz450f at around 48hp

good luck getting a bike under 200 lbs, much less 180, but 205 is still light these days

but effective power to weight ratio takes into account the riders weight too

da one twenny fiva.... it no lika da pasta!

dry weight 125 is around 192lbs, going from steel frame yz125 to aluminum is about 8lb drop. aftermarket pipe, silencer 2-5 lbs drop, ti shock spring, 1-2lbs
sss forks, lighter than old style forks, 2008 shock lighter than 99yz shock
im betting i get a easy 10lb min drop. now i gotta drop 20 lbs! one ounce of meth should do that! lol

r u saying im a fat dago bastard steve?

powdercoating everything adds 6 lbs

2013 yz125 = 207 lbs

your bike will be 214 lbs when you weigh it

Ill bet you im under 200!

From 1974 through 2004, the YZ 125 had a single backbone frame made from steel. It generally averaged from 176 to 198 lb (80 to 90 kg). For the 2005 year, however, Yamaha switched to a single backbone frame constructed from an aluminum alloy. This frame material change dropped the weight to 190 lb.(dry weight) For 2008 models, additional weight savings in the wheel assemblies and front fork suspension have yielded additional weight savings making wet weight, no gas sub-200 lb. Aluminum framed YZ125's are notably 'flickable' and sometimes this trait is seen as a drawback since they tend to become more difficult to control on rough surfaces.[2]

Dirt Rider 2004 125 shootout said
YZ125 - Weight (ready to ride, no gas): 207 lb
KX125 - Weight (ready to ride, no gas): 208 lb
RM125 - Weight (ready to ride, no gas): 208 lb
KTM125 - Weight (ready to ride, no gas): 207 lb
Gas Gas MC125 - Weight (ready to ride, no gas): 215 lb

Same format test as above

Dirt Rider 2005 125 shootout said
YZ125 - Weight (ready to ride, no gas): 200 lb (lost 7 lbs in 1 year!)
KX125 - Weight (ready to ride, no gas): 208 lb
RM125 - Weight (ready to ride, no gas): 211 lb
KTM125 - Weight (ready to ride, no gas): 205 lb

i havent seen you in ages! you may be in fighting shape for all i kno bro!


but realistically on paper the smaller bikes look that little bit better until you add rider weight to the mix.

but in the end who fucking cares about numbers as long as you are having fun. cool project. enjoy the build!

This!

Finally all together, going to get some gas and start her and break this bitch in tommorow and ride! Colin you were close. 209lbs on home scale. Dry only fork oil in it. Im wondering how much the handguards and 450 rear tire and rim add as i was expecting less. oh well hopefully no issues during break in! Next project my kids KTM 50, my buddy gave me, good shape but wont roll as i think they locked up the top end. But a free KTM 50 sx JR is fine with me.

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went riding today with my kids and broke the bitch in, man it feels good and handles way better than my old 125, fun day and i didnt feel to bad or outta shape. take a look at this plug. Is this too lean?

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