Z400 - Suzuki Z400 Forum : Z400 Forums
 
LinkBack Thread Tools
post #1 of 8 (permalink) Old 03-17-2019, 03:15 PM Thread Starter
:::Rookie Rider:::
 
Join Date: Mar 2019
Posts: 6
Z400

Hey guys just bought a 03 Z400 with a namura big bore kit, I’m having some issues and hoping to get squared away on here, seems to be a lot of good info on here
Hartson1 is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 03-17-2019, 03:24 PM Thread Starter
:::Rookie Rider:::
 
Join Date: Mar 2019
Posts: 6
Only details the seller was able to give me was that it was a namura 434 kit, I recently changed the oil and was pretty upset with what came out, it was all grey and seemed to have some metal in it, is that common for a fresh build? No jetting has been done and everything is stock as far as I know other than the head kit
Hartson1 is offline  
post #3 of 8 (permalink) Old 03-17-2019, 05:54 PM
:::Official Spammer:::
 
jetmech25's Avatar
 
Join Date: Apr 2012
Location: San Diego, CA
Posts: 3,906
Break-in oil changes can look kinda nasty. Everything is cutting into a seated position and puts out a bit of metal shavings. No way of telling how long itís been since the rebuild except his word, so Iíd just change oil every ride until it clears up.

'05 Z
94mm bbk, +4 stroker, Hot Cams, Vertex piston, FMF Power Bomb header and Power Core can, KW black diamond valves/dual springs, FCR39, K&N, Elka long-travel LT fronts and rear, Houser +3, +3/4 LT A-arms, American Star pro xs chromoly tie rods, Dyna non-programable, Tusk +3 axle.
jetmech25 is offline  
 
post #4 of 8 (permalink) Old 03-17-2019, 08:05 PM Thread Starter
:::Rookie Rider:::
 
Join Date: Mar 2019
Posts: 6
Quote:
Originally Posted by jetmech25 View Post
Break-in oil changes can look kinda nasty. Everything is cutting into a seated position and puts out a bit of metal shavings. No way of telling how long itís been since the rebuild except his word, so Iíd just change oil every ride until it clears up.
Ok well that makes me feel better, Iím still concerned about how this thing needs to be jetted, I found a thread about drilling the main jet out to a 1/16 hole so I did that for the time being because it was breaking up/starving for fuel about half throttle in gear but I wanna get the right jets in it. Is there anything else that needs to be done as well?
Hartson1 is offline  
post #5 of 8 (permalink) Old 03-18-2019, 12:24 AM
:::Official Spammer:::
 
jetmech25's Avatar
 
Join Date: Apr 2012
Location: San Diego, CA
Posts: 3,906
Thatís something I havenít heard before. Jets are about $6 at any shop and are precise fuel metering orifices. Drilling it would be terribly inaccurate. There is a jetting database where you can compare your bore, exhaust, air filter setup, and altitude to get pretty darn close on what you need.

'05 Z
94mm bbk, +4 stroker, Hot Cams, Vertex piston, FMF Power Bomb header and Power Core can, KW black diamond valves/dual springs, FCR39, K&N, Elka long-travel LT fronts and rear, Houser +3, +3/4 LT A-arms, American Star pro xs chromoly tie rods, Dyna non-programable, Tusk +3 axle.
jetmech25 is offline  
post #6 of 8 (permalink) Old 03-18-2019, 01:46 AM Thread Starter
:::Rookie Rider:::
 
Join Date: Mar 2019
Posts: 6
Quote:
Originally Posted by jetmech25 View Post
Thatís something I havenít heard before. Jets are about $6 at any shop and are precise fuel metering orifices. Drilling it would be terribly inaccurate. There is a jetting database where you can compare your bore, exhaust, air filter setup, and altitude to get pretty darn close on what you need.
I found it on this site and like I said itís deffinetly temporary until I can can get a full kit, Iím just wondering if all the other needles need to be changed too? I have zero knowledge on jetting a carb, and the big bore kit too, seemed to run alright today but did run better when I took the air breather box lid off, just makes me wonder if theirs other things that need to be done
Hartson1 is offline  
post #7 of 8 (permalink) Old 03-18-2019, 01:51 AM Thread Starter
:::Rookie Rider:::
 
Join Date: Mar 2019
Posts: 6
And where could I find one of that jetting database that you speak of??
Hartson1 is offline  
post #8 of 8 (permalink) Old 03-18-2019, 02:13 AM
:::Official Spammer:::
 
jetmech25's Avatar
 
Join Date: Apr 2012
Location: San Diego, CA
Posts: 3,906
It’s a sticky in the Maintenance section:

https://www.suzukicentral.com/forums...tabase-v2.html

There’s also one called The Secret World of the Fuel Mixture Screw that would be a good read.

'05 Z
94mm bbk, +4 stroker, Hot Cams, Vertex piston, FMF Power Bomb header and Power Core can, KW black diamond valves/dual springs, FCR39, K&N, Elka long-travel LT fronts and rear, Houser +3, +3/4 LT A-arms, American Star pro xs chromoly tie rods, Dyna non-programable, Tusk +3 axle.

Last edited by jetmech25; 03-18-2019 at 02:16 AM.
jetmech25 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Suzuki Z400 Forum : Z400 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










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