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Cylinder Works Big Bore Kit - 478Cc

Retail: $649.99
$589.99 - $599.99
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Cylinder Works Big Bore Kit - 478Cc - Main
Cylinder Works Big Bore Kit
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Product Description

  • Unlock your dirt bike's hidden potential with the power producing and durable Cylinder Works big bore kit.
  • No need to waste your time and money on getting your factory cylinder bored out because the Cylinder Works cylinder is stronger and more reliable. Best part about this cylinder is that it mounts directly to the factory crankcase and head.
  • The piston and rings that come with the Cylinder Works big bore kit are reliable for any motocross race.
  • Even down to the gaskets Cylinder Works employs high quality gasket materials for reliability.
  • Take your 450cc engine and add 3mm for a big bore 478cc with the Cylinder Works kit.
  • The Cylinder Works big bore kit includes: big bore cylinder, big bore piston, piston pin, piston pin rings, gasket kit.
  • Note: to achieve optimum performance re-jet the carburetor with the available jet kits.
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“ I installed this on my 06 yz450f it looks just like the OEM cylinder i did not install the piston ins... ”
yzbigbore Location: Rigby, Id
1-2 of 2
Overall
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Top 1000 Contributor
Location: Rigby, Id
I installed this on my 06 yz450f it looks just like the OEM cylinder i did not install the piston instead i ordered a high compression piston. This bike runs like i added another 10 HP. I have been riding it for 3 months with no problems. hill climbing you can't run out of power. power is strong all the way through i would recommend this product.
Overall
Durability
Ease of Installation
Performance
Power
Style
Top 250 Contributor
Location: Phoenix, AZ
It's your call
Had some prblms with it.. to start off i have built over 15 yfz motors with no prblms so it wasn't me.. but back to the product. First problem I had was the piston pin clip came out and put a gouge in the cylinder so i went and got another cylinder and rings and clips and maybe had 10 hours on it and I broke a valve which went through my piston and as i tore it all apart again I also noticed that the inside of the cylinder had a crack in it. It could have been from the valve but i dont think so because the valve went through the piston and ive read about the cylinders cracking on other people too. so just thought I'd say if you wanna risk it go for it had lots of power but if you want something that will last i would go OEM. thats where I'm headed now.
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“ This kit can be assembled for a YZ400F '99?... ”
BaoBassgm Location: Spain
“ Can I still use my stock cylinder head?... ”
James5787 Location: Hawaii
1-5 of 5
BaoBassgm Over 3 years ago Location: Spain
This kit can be assembled for a YZ400F '99?
this kit can be assembled for a YZ400F '99?
MotoSport Staff Expert
Over 3 years ago Location: Portland
No, only for the bikes listed.
Answer this Question
MotorHead420 Over 3 years ago
Will Stock Carb. Work? Will I Need To Jet It ?
Will stock carb. work with the big bore? Will it get enough gas or do I need to jet it more?
Expert MotoSport Staff
Over 3 years ago Location: Tualatin, Or
Yes the stock carb will work just fine. Yes it will have to re-jetted to run properly. Poor jetting can cause damage to the motor. A lean motor make alot of heat
Top 1000 Contributor
Over 3 years ago Location: Rigby, Id
The stock carb will work you should be able to use the same main jet.
Top 1000 Contributor
Over 3 years ago Location: Rigby, Id
the bigger the bore the more air flow which draws more fuel. so there shouldn't be any reason to change the jetting
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bigjohn450 Over 3 years ago
What brand of piston is included with this kit? and what compression ratio is it?
MotoSport Staff Expert
Over 3 years ago Location: USA
They package Vertex pistons with their kits.
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yfzrider112 Over 3 years ago
With this kit can I use my stock cams or do I need to upgrade them?
Top 25 Contributor
Over 3 years ago Location: Cahttanooga tenn.
stock cams sould work
Top 1000 Contributor
Over 3 years ago Location: Rigby, Id
stock cams work fine but it never hurts to go with a upgraded cam
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James5787 Over 3 years ago Location: Hawaii
Can I still use my stock cylinder head?
Also the piston does not look like my original piston, this one only shows grooves for two intake valve and two ehaust valves. My original piston has three intake valves
MotoSport Staff Expert
Over 3 years ago Location: Portland, OR
The stock/oem head will need to be used with the installation of this kit. Keep in mind the images of this product are generic and do not depict what yours will look like. As long as you input the bikes make/model/year correctly, you'll receive the correct parts to fit that bike.
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