re-jet for big bore and slip on - Honda ATV Forum
Performance Modifications Have Modifications? Want to ask about a mod? Having problems with a certain mod? Ask and post here! Carbs, Exhausts, Engines, Etc...

 
LinkBack Thread Tools Display Modes
post #1 of 10 (permalink) Old 07-12-2011, 06:00 PM Thread Starter
Member
 
maverick4925's Avatar
 
Join Date: Jun 2011
Posts: 53
re-jet for big bore and slip on

i'm boring out my cylinder .020 and i have an hmf slip on. i know before i did the bore kit that the carb never got jetted for the slip on so i'd like to hear from you guys what jet sizes i should get and where i should get them.
maverick4925 is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old 07-12-2011, 06:05 PM
Super Moderator
Supporting Member
 
TRX2fiveO's Avatar
 
Join Date: Jun 2009
Location: East coast North Carolina
Posts: 18,098
Liked: 322 times
Garage
What size quad and year?? .020 is like 1/2 mm over stock plenty of meat left for future work.

"MOOSE WAGON "
00 TRX400EX aka "MOOSE ROCKET"
91 TRX250X aka "MOOSE WAGON" RETIRED
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
96 Polaris 250 Trail Blazer (daughters)
06 TRX450ER aka === Under construction

Progress and Help
PM FOR MANUAL HELP
JETTING
Service_Manual_Downloads
2000_400EX_Build
400EX_Pivot_Bolt_
TRX2fiveO is offline  
post #3 of 10 (permalink) Old 07-12-2011, 06:11 PM Thread Starter
Member
 
maverick4925's Avatar
 
Join Date: Jun 2011
Posts: 53
it's a 2004 400ex. but i'm only doing 20 over because i dont need to much power yet. still a beginner. never ridden a motorcycle or a quad, and i only rode my quad 2 times for about 10 miutes a piece.
maverick4925 is offline  
Sponsored Links
Advertisement
 
post #4 of 10 (permalink) Old 07-12-2011, 06:44 PM
Senior Member
 
DAN400ex's Avatar
 
Join Date: Sep 2010
Location: Winchester, VA
Posts: 1,701
For a slip on and (I assume the .020 is what, a 426?), if thats all your running probably a 160 main jet, what do you think moose, 42 pilot? Now if your running an open airbox lid you’ll want to run a 175. What other mods do you have going? Dyno jet makes good kits, I’m very happy with mine. However, if you want to buy individual jets rockymountainatv/mc.com sell them but if you want to go that way you’ll need a 175 to 177 main jet for just the bore kit and slip on, and if your running an open airbox lid you’ll want to go with a 192 to 195 main jet, reason being that keihin jets and dyno jets are sized differently.

2008 TRX400ex

42 pilot jet
Stage 2 Dynojet kit
K&N Powerlid
Lexx MXe slip on
Armadillo full body and swing arm skid plates.
450r front suspension


Dan in VA

DAN400ex is offline  
post #5 of 10 (permalink) Old 07-12-2011, 07:53 PM
Super Moderator
Supporting Member
 
TRX2fiveO's Avatar
 
Join Date: Jun 2009
Location: East coast North Carolina
Posts: 18,098
Liked: 322 times
Garage
Quote:
Originally Posted by DAN400ex View Post
For a slip on and (I assume the .020 is what, a 426?), if thats all your running probably a 160 main jet, what do you think moose, 42 pilot? Now if your running an open airbox lid you’ll want to run a 175. What other mods do you have going? Dyno jet makes good kits, I’m very happy with mine. However, if you want to buy individual jets rockymountainatv/mc.com sell them but if you want to go that way you’ll need a 175 to 177 main jet for just the bore kit and slip on, and if your running an open airbox lid you’ll want to go with a 192 to 195 main jet, reason being that keihin jets and dyno jets are sized differently.
A 400EX is actually 398cc .020 is .5 over stock making it about a 402cc.
42 pilot is always good with a slip-on and filter 180 keihin hex without the lid 190 hex jet. dynojet would be roughly 160 with the lid 170 without

"MOOSE WAGON "
00 TRX400EX aka "MOOSE ROCKET"
91 TRX250X aka "MOOSE WAGON" RETIRED
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
96 Polaris 250 Trail Blazer (daughters)
06 TRX450ER aka === Under construction

Progress and Help
PM FOR MANUAL HELP
JETTING
Service_Manual_Downloads
2000_400EX_Build
400EX_Pivot_Bolt_
TRX2fiveO is offline  
post #6 of 10 (permalink) Old 07-13-2011, 02:08 AM Thread Starter
Member
 
maverick4925's Avatar
 
Join Date: Jun 2011
Posts: 53
Alright thanks for your answers. I don't have any other mods just the bore and slip on. But is there any difference in power with the open lid air box?
maverick4925 is offline  
post #7 of 10 (permalink) Old 07-13-2011, 05:11 AM
Super Moderator
Supporting Member
 
TRX2fiveO's Avatar
 
Join Date: Jun 2009
Location: East coast North Carolina
Posts: 18,098
Liked: 322 times
Garage
Yes there is a difference. but you will have to clean your air filter more often.

"MOOSE WAGON "
00 TRX400EX aka "MOOSE ROCKET"
91 TRX250X aka "MOOSE WAGON" RETIRED
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
96 Polaris 250 Trail Blazer (daughters)
06 TRX450ER aka === Under construction

Progress and Help
PM FOR MANUAL HELP
JETTING
Service_Manual_Downloads
2000_400EX_Build
400EX_Pivot_Bolt_
TRX2fiveO is offline  
post #8 of 10 (permalink) Old 07-13-2011, 10:12 AM Thread Starter
Member
 
maverick4925's Avatar
 
Join Date: Jun 2011
Posts: 53
ehh that's alright. i can handle that. so how do i go about breaking this thing in when i get it rebuilt? and how can i tell if i neede a new timing chain? and how does that tensioner work? i just want to make sure i get it right.
maverick4925 is offline  
post #9 of 10 (permalink) Old 07-13-2011, 02:06 PM
Super Moderator
Supporting Member
 
TRX2fiveO's Avatar
 
Join Date: Jun 2009
Location: East coast North Carolina
Posts: 18,098
Liked: 322 times
Garage
if you need a service manual look in the manuals and schematics section there is a free download there.

HOLY CRAP!!!! I sound like deeperinthebush...LMAO

"MOOSE WAGON "
00 TRX400EX aka "MOOSE ROCKET"
91 TRX250X aka "MOOSE WAGON" RETIRED
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
96 Polaris 250 Trail Blazer (daughters)
06 TRX450ER aka === Under construction

Progress and Help
PM FOR MANUAL HELP
JETTING
Service_Manual_Downloads
2000_400EX_Build
400EX_Pivot_Bolt_
TRX2fiveO is offline  
post #10 of 10 (permalink) Old 07-13-2011, 02:12 PM
Super Moderator
Supporting Member
 
Deeperinthabush's Avatar
 
Join Date: Feb 2011
Location: No longer in Pensacola Fl.
Posts: 11,311
Liked: 54 times
Quote:
Originally Posted by TRX2fiveO View Post
if you need a service manual look in the manuals and schematics section there is a free download there.

HOLY CRAP!!!! I sound like deeperinthebush...LMAO
I heard that Meese,errrrr Moose...

FREE REPAIR MANUALS >>http://www.hondaatvforums.net/forums...all-years.html 1986-1992 trx350 parts for sale>>http://www.hondaatvforums.net/forums/atv-parts-sale/29225-complete-part-out-1986-fourtrax-350-a.html
Deeperinthabush is offline  
Reply

  Lower Navigation
Go Back   Honda ATV Forum > Honda ATV Technical Discussions > Performance Modifications

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda ATV Forum 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
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