Whats the best big bore kit available ???????? - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums
 
LinkBack Thread Tools
post #1 of 10 (permalink) Old 02-26-2012, 10:38 PM Thread Starter
Junior Member
 
Join Date: Feb 2012
Location: Miami
Posts: 11
Whats the best big bore kit available ????????

Whats good im looking to get a big bore kit for ky 2006 450 but do not know which is the best the athena or the cylinder works kit please help me out if u know any info on either thanks a milli
Flyromeofly is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old 02-26-2012, 11:06 PM
Senior Member
 
2004yfzrider05's Avatar
 
Join Date: Mar 2008
Location: Falun, Kansas
Posts: 1,429
Ive never ran a big bore but from what ive read and heard nmotion/jsr cylinders are the best but pretty pricey I do believe. Next I would say athena they are the most resonable and good cylinders from what I've read how ever the piston that comes in the kit is junk dont run it. Thing to watch for on the athena cylinder is that its a bit shorter than oem cylinder i think there is a pinned thread above that explains it. As far as the cylinder works they have had problems in the past with them cracking, but they supposedly fixed it with their gen 2 cylinders. Some people say to stay the hell away from them and then others will say that they havent had a problem with them, to me it would be a gamble.

2008 YFZ
2007 yz250f
2004yfzrider05 is offline  
post #3 of 10 (permalink) Old 02-26-2012, 11:11 PM
Senior Member
 
YFZER359's Avatar
 
Join Date: Sep 2008
Location: CANADA EH!
Posts: 3,780
I ordered an ice cube last week. I've seen a lot of guys at my dunes with them and they haul ass so I'm goin with that. If I had the money I'd go with JSR.

Stay away from cylinder works.

07 YFZ450 BLUE
Dasa, FCI, cam-mod, MXR6/MXR4, race cut plastics.....
YFZ488, JSR race port, +1 valves, 12.5:1 CP in the making.....
KALEB-GYTR DONE!!!
'09 Ram1500, Hemi, Flow-Pro exhaust, HID's.
'08 Pitster Pro X4 150. Pro Circuit T-4, Pro Taper Contours, Michaline Starcross. V2 race head and 170 BBK soon
YFZER359 is offline  
post #4 of 10 (permalink) Old 02-26-2012, 11:44 PM
Senior Member
 
insaneYFZshane's Avatar
 
Join Date: Dec 2011
Location: airdrie alberta canada
Posts: 358
the athena is a really good kit, and you will have NO problems running the piston that comes with it, its just only a 12.1 compression is all.

GOT AN 04 yfz450!! yay my first 450! 478 athena bbk, +3 hot rods stroker crank, gytr can w/fmf powerbomb header, billet intake adapter w/k&n. Soon to have FCI, sredrum 42.5mm carb, venom port job and venom full pipe. My other ride is a 03 z400 w/462 motor, houser/elka suspension, yoshi, fcr39 and tons more.

insaneYFZshane is offline  
post #5 of 10 (permalink) Old 02-27-2012, 01:02 AM
dippy doodle
 
yfzrider69's Avatar
 
Join Date: Nov 2008
Location: Auburn, WA
Posts: 2,802
The athena piston is good for a paper weight and that's about it.

07' YFZ450
06' YFZ450
06' YFZ450


yfzrider69 is offline  
post #6 of 10 (permalink) Old 02-27-2012, 03:24 PM Thread Starter
Junior Member
 
Join Date: Feb 2012
Location: Miami
Posts: 11
Thanks for the input i believe im gona go with the athena kit with the hot rods stroker crank should i be running a bigger carb with the kit or leave the stock carb on i have the stock carb on now jetted with the powerbowl??????
Flyromeofly is offline  
post #7 of 10 (permalink) Old 02-27-2012, 03:41 PM Thread Starter
Junior Member
 
Join Date: Feb 2012
Location: Miami
Posts: 11
Just checkd out the jsr big bore kit and i think thats what im gona go with but wont see it for a month backorder thanks Alot for the advice any riders here from south florida where theres absolutly no good spots to ride????
Flyromeofly is offline  
post #8 of 10 (permalink) Old 02-28-2012, 10:42 PM
Member
 
Join Date: Jan 2012
Location: Columbus, Ohio
Posts: 80
Get a Curtis Sparks big bore kit. A bit on the expensive side but it is the best kit hands down.
yfz_rider99 is offline  
post #9 of 10 (permalink) Old 02-28-2012, 11:07 PM
Senior Member
 
kb motorsports's Avatar
 
Join Date: Dec 2005
Location: Kentucky
Posts: 5,350
Send a message via AIM to kb motorsports
I've had great luck with Cylinder Works and Athena Cylinders you don't always have to spend a lot to get a good product. I've had problems with billet aluminum cylinders in the past blowing head gaskets. Regardless of the cylinder you buy just make sure you change the oil and clean the air filter often if your concerned with durability.

ATV Performance Parts
270-774-1982



Store Hours
Monday - Friday
10:00am - 6:00pm Eastern Time
270-774-1982
Sales@kbmotorsportsonline.com


kb motorsports is online now  
post #10 of 10 (permalink) Old 03-27-2012, 07:52 PM
Junior Member
 
Join Date: Mar 2012
Location: lehigh acres fl
Posts: 22
Quote:
Originally Posted by Flyromeofly View Post
Just checkd out the jsr big bore kit and i think thats what im gona go with but wont see it for a month backorder thanks Alot for the advice any riders here from south florida where theres absolutly no good spots to ride????

I live in lehigh acres florida and we have some great areas to ride over here...we are on the west coast of florida straight across from miami
barryturner1 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome