Call to order 608-842-0680
Availability: Built to order
Price: $2395
YZ167 Specifications:
Fits 1997-Current YZ125 / YZ125X
Product Description
Bore: Yes (60mm)
Stroke: Yes(59mm)
Actual Displacement = 166.82cc
This is it, the ONE and ONLY YZ167. It is our most asked about kit for the YZ125 and it has been for many years. This kit is very popular with Vet racers of all levels and works well no matter how you ride it. It can be lugged like a 250 or screamed like a 125, it does both equally well. Put a flywheel weight on it and it is one of the best woods engines you will ever find. It is so much fun and completely un-detectable by looking at it from the outside. However the exhaust note WILL give you away.
Engine Modifications Included:
This is a complete engine build. It requires you to send us your YZ125 engine and we will modify it to a YZ167.
Cylinder: Bore, Port and Replate with Ceramic Nickel Bore coating.
Power Valves: Precision Machined to exact specifications.
Head: Re-chambered to work with the custom Wiseco Big Bore piston and stroker crank. 100 octane suggested for most conditions.
Crankshaft: Stroked and balanced.
Crankcase: Modified to clear stroker crank and larger piston.
Blueprint: Calculate deck height, squish clearance, trapped volume, port timing and compression ratio and list on your personal Spec-Sheet.
Notes: This kit requires you to send us your entire engine for modification with kick starter and shifter.
Notes: Prices listed are to install stroker kit parts in good condition engine. Should your engine need rebuild parts there will be additional charges. We will call for approval before we install any parts that will have additional charges. (example: rod kit, mains, main seals, trans parts)
If you are looking for a budget bike build up the best years for this mod was 01-03 followed closely by 05-Current.
My yz 167 spark plug number
Hello, Do you think this will work on the 22 yz125? I read they redesigned the engine. so I’m debating on building a steel frame or brand new 22. But I really need your engine
How many hors can be put on the 167 kit and the 151 kit before it has to be rebuilt. I am a A class/ Vet rider?
Can you please send me a picture of this cylinder???
can you make it so it will run on 93 pump gas?
good afternoon , yes sir it can please give us a call 336-694-3059 9-5 Monday-Friday .
So is there anything u can do with a 93 yz 125
good afternoon, we have a few options for the 93 yz 125 please give us a call 336-694-3059 9-5 Monday-Friday
We need to order either a complete crank or just a rod kit to rebuild a yz167 customer shop job. Please give me a call so i can get something ordered at 540-825-5544. Thanks
I have a 09 yz125 and wondered if you are still doing the 167 build for these motors?
Thank you
Mark Dorey
good afternoon , ye sir we still offer this kit please give us a call 336-694-3059 9-5 Monday-Friday
Hello, I have a 2010 and am in the middle of putting a new crank in my cases are split main barrings are in would it be possible to get to done cheaper in I just send the empty cases and cylinder?
Hi. i need a replacement piston and rings for my 2020 167. do i need a special piston from you guys, or will the wiesco 144 piston work?
Wonder how far out you guys are these days? I have a 1996 that was done
by tou a long time ago and it is pretty tired and not making much horsepower
anymore and needs a refreshing.
What’s the compression ratio when complete?
If I was to get the 167 kit could u install a boysen water pump in it if I sent it with my motor and can y’all fix a little chip in my left side case
good morning , yes the Boysen pump will still be usable and we can also fix the casing long as its not beyond repair please give us a call 336-694-3059 9-5 Monday-Friday.
Hi! What’s the turn around time on this? Thanks.
Interested in Building a YZ125 to 165 Big Bore Kit for Daytona 2022 World Karting Championship. My son and I have been racing YZ and lately CR125 blue printed by Tracy Phillips out of Alabama. The New ICC Italian Motors blow us away as they can rev up to 16000 RPM and we max out at 13500 RPM (You Tube Daytona Kartweek 2020 (CR125cc Shifter) and Youtube 2012 Daytona World Karting Championship where my son got a 5th before the Italian ICC motors appeared.!991 on the shelf .
My 2000 125 has a cast iron sleeve in the barrel ..will this matter or you will have to bore it out larger than the sleeve anyways ?
Hi don’t know if you can help looking for big bore kit for my KTM 150 thanks Stan
How long does it take for the yz167 big bore mod? Would you recommend the 167 big bore with a lectron carb?
good afternoon , it takes anywhere between 3-4 weeks to big bore please give us a call 336-694-3059 9-5 Monday-Friday.
Hi there, can you send me some more info on this please. I am after dyno graphs against stock 125 and do you sell a purpose build pipe for this combination?
Also can the bare cases with a crank be sent ? As the reassemble will be done by my self.
Can the 167 mod be done on a 99 yz 125??
good afternoon, yes sir this option will work for your year give us a call 336-694-3059 9-5 Monday-Friday .
Hi Team
Are you still doing these 167 kits?
good afternoon, yes we are still offering this kit please give us a call 336-694-3059 9-5 Monday-Friday.