Skip to content

BIKE BUILD | 2006 KAWASAKI KX250 | Bike Reviews | Features | How To

We take a detailed look at this epic 2006 Kawasaki KX250 two-stroke build by Brock Fiaschi. It is one of the sexiest Kawasaki builds we've seen!

Brock Fiaschi is a Kawasaki man that began riding at four years-old on a Yamaha PW50. He stepped on his first Kawasaki KX60 as soon as he was big enough and it has been nothing but green machines for Brock ever since. The 25 year-old West Australian has a soft spot for two-strokes and when he saw the KX125 creations from Monster Energy Pro Circuit mechanic Jon Primo, Brock decided he needed to have one. However, Brock decided he wanted a KX250 and he wanted to build it himself so here’s his story on his 2006 Kawasaki KX250 build.


I started looking at forums online and researching where I could buy a kit to make my 2006 KX250 look like a current model using KX450F plastics. I couldn’t find the answers I was looking for so I decided to message Jon Primo on Instagram and he got back to me which I thought was remarkable. I told him my idea of putting my 2006 KX250 engine into a KX450 body kit. Jon told me how much it was going to cost me and I told him money wasn’t an issue so he got onto it straight away.

Jon purchased a cheap KX250 and used it as a template to make up the kit for me to turn my bike into a modern-looking KX250 two-stroke. He sent me all of the details and a conversion kit and I got to work. I completely stripped my bike and sent the frame, swingarm, front and rear brake calipers and brake master cylinders to be powder coated in satin black.

With engine out I split the cases and removed every bearing, seal and gasket. I sent the cases, and power-valve caps to be ceracoated by Moto Kote. When I had the cases back, I went to my local Kawasaki dealership Mach 1 Kawasaki in Perth and ordered every gasket, seal and bearing to begin the rebuild.

I had all of the bolts, the radiators and cylinder bead blasted so it all looked brand new and I broke out my wire brush and cleaned anything else that needed it. I purchased a Bud Racing cylinder head in green and went for a Lectron carburetor and a V-Force 3 reed block, Vertex piston kit, and I rebuilt the crank and replaced the whole power valve. I went for a Pro Circuit Ti2 shorty silencer and Works pipe and I contacted N-Style for a custom graphics kit. I ended up having another kit made by Westeffex which is on the bike now.  The list of jobs just went on and on.


I started the project in 2017 and it took me just over a year to complete. One of the most challenging parts of the build was pulling all of the old components out of the engine. Some of the bearings were seized and it was tricky heating the cases to get them out without getting them too hot. Reassembly was also a challenge making it all fit and the most challenging was the Lectron carby pushing the airbox back which then rubbed on the shock. That took a bit of work to get right.

The first time I rode it, it took a bit fine tuning to get it right. I checked the piston after five-hours and had some detonation, so I took it out and replaced it. I heard a lot of good things about Lectron but the standard Keihin carburetor worked better.

When I finished the bike I started racing WA State motocross rounds on it in the C-Grade Open class. The only thing that didn’t go to plan was the subframe cracking so I had that repaired and kept riding it. To ride, it handles just like a normal 2006 KX250 but it is skinnier and lighter and it goes like a bat out of hell. It was fun to race and it was awesome to look at and after spending so much money on it I didn’t want to trash it so I parked it in my theatre room at home and that’s where it has stayed.

The way I look at it is I don’t ride it anymore because I have a KX125 and KX250F and I don’t want this bike to just go to waste. Including the purchase of the bike the entire project cost me $21,000. I do have a couple of interested people but I haven’t sold it yet. It should go to someone that really wants it. The right buyer will come along.


The Kawasaki KX250 was produced from 1974 to 2008 and was made famous by the likes of Jeff Ward, Jeff Emig and Ricky Carmichael who amassed plenty of victories on the mighty KX. The new generation 250F and 450F KX models made the two-stroke KX250 redundant, however, the KX250 has become somewhat of a collector’s piece in recent years. A quick search of the interweb shows asking prices ranging between $6500 and $8500 for late model examples in reasonable condition. Brock’s KX250 Special Edition can be yours for a lot more.


Brock went all-out when parts shopping for his KX250 build. The list is long so we’ll break it into three sections.


Pro Taper handlebars
ASV clutch and front brake black unbreakable levers
Works Connection green head stem nut
Pro Taper pillow top green/grey grips
Hammerhead bear brake and gear shift levers black/green
Pro Circuit launch control device
Jon Primo frame adapter kit for 2018 KX450F plastics
2018 Race Tech flo green plastics kit

2018 Cycra Stadium front plate

OEM Kawasaki KX450 seat with Pro Pleat ribbed seat cover
OEM 2018 Kawasaki KX450 subframe

OEM 2018 KX450 fuel tank

Race Tech green shock guard

Westeffex graphics kit

Boysen clutch and ignition covers
Powder coated frame, subframe, swingarm and linkages in black
Powder coated brake master cylinders in desert gold
SM Pro Platinum wheels rims with SM Pro hubs and blue spoke nipples
Dunlop MX33 rear tyre and Dunlop MX3SF front tyre
RHK Bling Kit
Carbon fibre frame guards and bash plate

Black grip tape on frame

Blue fuel cap breather hose
Samco Sport radiator hose kit

Samco Sport carburettor hose kit
Bud Racing cylinder head
Lectron carburettor
Vertex piston kit
Pro Circuit Works exhaust pipe
Pro Circuit Ti2 shorty silencer
Twin Air Powerflow air filter kit
Twin Air Powerflow screen
Wiseco crank with all new components and bearings
Cerakote on engine casings in black and Cerakote on power-valve covers and water pump cover
Talon 5- tooth blue rear sprocket

For the full feature, check out issue #533 of ADB.