Stroker engine 471cc - Kawasaki KFX450 Forum :: KFX450HQ.com
Engine/EFI/Drivetrain Discuss engine, fuel injection, air intake, and drivetrain modifications here.

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 69 (permalink) Old 08-21-2019, 02:57 PM Thread Starter
Senior Member
 
Join Date: Jan 2019
Posts: 244
View Blayzin212's Photo Gallery(0)
Stroker engine 471cc

I know the compression ratio will go up .3 to .5


Can I put a +3mm stroker crank in with any piston?


Sent from my SAMSUNG-SM-G935A using Tapatalk
Blayzin212 is online now  
Sponsored Links
Advertisement
 
post #2 of 69 (permalink) Old 08-21-2019, 07:28 PM
Super Moderator
Premium Member
 
Dust Devil's Avatar
 
Join Date: Oct 2009
Location: Lake Havasu city, Arizona
Posts: 9,471
View Dust Devil's Photo Gallery(0)
Quote:
Originally Posted by Blayzin212 View Post
I know the compression ratio will go up .3 to .5


Can I put a +3mm stroker crank in with any piston?


Sent from my SAMSUNG-SM-G935A using Tapatalk
Yes...! Stock or after market piston can be used...

It's recommended to use OEM bearings & gaskets due to tested reliability...!!

HotRod stroker crankshaft, main bearing/seals and complete gasket set for complete installation. +3mm stroke. Makes 471cc. >>>Uses stock piston. Bolt in and go!<<<

Check with Site Sponsors "First"

(Immortal ATV)
Todd
http://immortalatv.com
1-(800)380-9646
[email protected]
Save 5% off $100 or more, use coupon code: KFX450HQ

(KB Motor-sports)
Website:
http://www.kbmotorsportsonline.com

(Discount Tire)
At The Store: www.discounttire.com
To Your Door: www.discounttiredirect.com
Sales and Technical: 1.888.459.4080





Last edited by Dust Devil; 08-21-2019 at 07:30 PM.
Dust Devil is online now  
post #3 of 69 (permalink) Old 08-22-2019, 08:00 AM Thread Starter
Senior Member
 
Join Date: Jan 2019
Posts: 244
View Blayzin212's Photo Gallery(0)
I ordered the hot rods +3 stroker and 500cc big bore kit from CP Carrillo BP Racing and Athena.
13.1:1 compression before the stroker so around 13.5:1 ratio with the stroker. Though I have my doubts, Carrillo insures me that I can use pump gas. I dont mind making a mixture of 93 and a higher octane gas, but I will not run strait race fuel. I raced for years and i already know that i cant afford that. I'll sell the bike if that's how it goes.

Are you suggesting that i still need to buy stock bearings and gaskets?

Here is the kit I bought.

https://rover.ebay.com/rover/0/0/0?m...2F283332395724


Sent from my SAMSUNG-SM-G935A using Tapatalk
Blayzin212 is online now  
Sponsored Links
Advertisement
 
post #4 of 69 (permalink) Old 08-22-2019, 06:17 PM
Super Moderator
Premium Member
 
Dust Devil's Avatar
 
Join Date: Oct 2009
Location: Lake Havasu city, Arizona
Posts: 9,471
View Dust Devil's Photo Gallery(0)
Quote:
Originally Posted by Blayzin212 View Post
I ordered the hot rods +3 stroker and 500cc big bore kit from CP Carrillo BP Racing and Athena.
13.1:1 compression before the stroker so around 13.5:1 ratio with the stroker. Though I have my doubts, Carrillo insures me that I can use pump gas. I dont mind making a mixture of 93 and a higher octane gas, but I will not run strait race fuel. I raced for years and i already know that i cant afford that. I'll sell the bike if that's how it goes.

Are you suggesting that i still need to buy stock bearings and gaskets?

Here is the kit I bought.

https://rover.ebay.com/rover/0/0/0?m...2F283332395724


Sent from my SAMSUNG-SM-G935A using Tapatalk
Yea! (without the +3 stroker).. The "100mm" Athena kit with 13:1 piston you can remain on pump gas of 93 octane due to increased displacement actually drops the compression 0.2~ 0.3. (like 12.8:1)...

But..!! Your kit is 98mm & with a (+3 stroker)..So plan on 96~100+ octane mixture for 13.4:1 compression ratio to be safe...

Listen for any knocking & pinging when you're up & running...If you do raise the octane before you pre-ignition or detonation occurs...(grenade the engine literally)....!!!

Check with Site Sponsors "First"

(Immortal ATV)
Todd
http://immortalatv.com
1-(800)380-9646
[email protected]
Save 5% off $100 or more, use coupon code: KFX450HQ

(KB Motor-sports)
Website:
http://www.kbmotorsportsonline.com

(Discount Tire)
At The Store: www.discounttire.com
To Your Door: www.discounttiredirect.com
Sales and Technical: 1.888.459.4080




Dust Devil is online now  
post #5 of 69 (permalink) Old 08-22-2019, 08:03 PM Thread Starter
Senior Member
 
Join Date: Jan 2019
Posts: 244
View Blayzin212's Photo Gallery(0)
Damn... I was on the phone with athena, and a big distributor and they couldnt get me the 100mm kit alone for like 2 months. I tried and tried to get one and then I came across this kit and thought I may be able to run pump with it. I'm not up to date with it but about 6yrs ago methocyclopentandienal manganese tricarbonal was the best octane booster.
What do you recommend for the times that I dont have race gas and have to up the octane with a booster?

Sent from my SAMSUNG-SM-G935A using Tapatalk
Blayzin212 is online now  
post #6 of 69 (permalink) Old 08-22-2019, 08:15 PM Thread Starter
Senior Member
 
Join Date: Jan 2019
Posts: 244
View Blayzin212's Photo Gallery(0)
Or do u think its smarter for me to return this and try to find the 2 kits separately?

Have u riden a kfx with a big bore? I was hoping it would make a noticable difference. I'm still going to send my head to be ported, and flattened. So maybe all together it will make a nice advancement.

Sent from my SAMSUNG-SM-G935A using Tapatalk
Blayzin212 is online now  
post #7 of 69 (permalink) Old 08-23-2019, 01:11 AM
Super Moderator
Premium Member
 
Dust Devil's Avatar
 
Join Date: Oct 2009
Location: Lake Havasu city, Arizona
Posts: 9,471
View Dust Devil's Photo Gallery(0)
Quote:
Originally Posted by Blayzin212 View Post
Or do u think its smarter for me to return this and try to find the 2 kits separately?

Have u riden a kfx with a big bore? I was hoping it would make a noticable difference. I'm still going to send my head to be ported, and flattened. So maybe all together it will make a nice advancement.

Sent from my SAMSUNG-SM-G935A using Tapatalk
Not a KFX but other bikes with a big bore...Yes..very noticeable difference can be felt...!!!

You can sell the 98mm CP 13:1 that comes with the kit & buy a 98mm 12:1 piston with the +3 stroker to run on pump gas...

Check with Site Sponsors "First"

(Immortal ATV)
Todd
http://immortalatv.com
1-(800)380-9646
[email protected]
Save 5% off $100 or more, use coupon code: KFX450HQ

(KB Motor-sports)
Website:
http://www.kbmotorsportsonline.com

(Discount Tire)
At The Store: www.discounttire.com
To Your Door: www.discounttiredirect.com
Sales and Technical: 1.888.459.4080




Dust Devil is online now  
post #8 of 69 (permalink) Old 08-23-2019, 08:35 AM Thread Starter
Senior Member
 
Join Date: Jan 2019
Posts: 244
View Blayzin212's Photo Gallery(0)
Good idea

Sent from my SAMSUNG-SM-G935A using Tapatalk
Blayzin212 is online now  
post #9 of 69 (permalink) Old 08-23-2019, 12:13 PM Thread Starter
Senior Member
 
Join Date: Jan 2019
Posts: 244
View Blayzin212's Photo Gallery(0)
Thanks man....
I just called the company thats mailing the kit and had them switch the 13.1 to a 12.8 piston. I feel good about that.

Sent from my SAMSUNG-SM-G935A using Tapatalk
Blayzin212 is online now  
post #10 of 69 (permalink) Old 08-23-2019, 01:55 PM
Super Moderator
Premium Member
 
Dust Devil's Avatar
 
Join Date: Oct 2009
Location: Lake Havasu city, Arizona
Posts: 9,471
View Dust Devil's Photo Gallery(0)
Quote:
Originally Posted by Blayzin212 View Post
Thanks man....
I just called the company thats mailing the kit and had them switch the 13.1 to a 12.8 piston. I feel good about that.

Sent from my SAMSUNG-SM-G935A using Tapatalk
Shaving your head due to warping will add compression too..how much is determined by how much they shave off...!!!

And remember a +3 stroker crank will increase your compression 0.3~0.5 to a 12.8:1 which will put you at 13:1 or more...94+ octane recommended...so you might need an octane booster..

Check with Site Sponsors "First"

(Immortal ATV)
Todd
http://immortalatv.com
1-(800)380-9646
[email protected]latv.com
Save 5% off $100 or more, use coupon code: KFX450HQ

(KB Motor-sports)
Website:
http://www.kbmotorsportsonline.com

(Discount Tire)
At The Store: www.discounttire.com
To Your Door: www.discounttiredirect.com
Sales and Technical: 1.888.459.4080





Last edited by Dust Devil; 08-23-2019 at 02:00 PM.
Dust Devil is online now  
Reply

  Lower Navigation
Go Back   Kawasaki KFX450 Forum :: KFX450HQ.com > KFX450 Performance > Engine/EFI/Drivetrain

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki KFX450 Forum :: KFX450HQ.com 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











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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