Yamaha Raptor Forum - Reply to Topic
Thread: Jetting that works, collecting info Reply to Thread
Title:
Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

Register Now



In order to be able to post messages on the Yamaha Raptor 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










  Additional Options
Miscellaneous Options

  Topic Review (Newest First)
12-26-2017 09:11 PM
FinksburgRaptor Im not having any luck with the jetting. The fmf power bomb turns cherry red. Starts fine.. has quarter throttle.. has aftermarket needles.. set on the 2 from the top. 25 polits.. 46 L carb main and 50 R main jet.. im at a 800 ft elevation..
12-23-2017 09:58 PM
FinksburgRaptor
Jetting help

2004 raptor
Elevation: 700 - 1000
Air fuel: 3L - 3R
Pilot jet: 25
Main jet: 146-150
Clip on needle: 3 out of 6 positions
Mods: fmf header w/ fmf muffler, rev box, k&n filter with stock box and lid. Basically stock engine

Ok the problem im having is major hesitation from 1/4 throttle to 1/2-3/4 throttle. Blueish- orange flame are coming out of the muffler. It starts and idels fine. I also have problems with header pipe glowing orange like its still running lean.. idk, this is getting frustrating!

I need some expert advice.. also carbs have cleaned and rebuilt.
08-13-2017 12:56 AM
03LimitedEditionRaptor go back to the 4th or 3rd clip. People don't really even run in the 5th clip position when running no air box lid at all.
08-12-2017 07:49 PM
COLTONTOWNSEND ok i got the stage 2 dyno jet kit installed im running 144/146 dj with the dyno jet needle on the 5th clip from the top. the directions said to intall on the 4th clip but my snorkle has been more modified then what the directions said to modify so i moved the needle 1 notch farther from the jet. the bike no longer has the hard stumble that it did and can reach full throttle . it does sputter a bit when you directly punch the throttle to max. im not to shure what to do i tryed calling the DJ service line but couldnt get through. mabe go up a size on jet, mover my needle any help??
07-25-2017 09:54 AM
Mad Dog DJ kit comes with some instructions on their sizing. They are quite a bit different as the largest number that will come in the kit will be a lesser number than you have now but will flow more.

Here are the instructions you'll receive with the kit, should give you a starting off point.
http://www.dynojet.com/pdf/Q414.pdf
07-24-2017 10:20 AM
COLTONTOWNSEND OK well i just found out that the person i got my bike from had grooved out the duct on air box for more air flow so im ordering the dyno stage 2 jet kit that comes with the needles. i currently have mikuni 150/155 mains with 25 pilots stoclk needles in carb now iv heard that the dyno jets are numbered differnetly then the mikuni. any ideas on where to start with the dyno kit? the bike runs pretty decent the way it is now i just get a hard stumble when i try to full thottle. bike mods k&n air replacment filter with duct removed with hmf slip on
07-06-2017 07:01 AM
COLTONTOWNSEND
Quote:
Originally Posted by quadmaniac View Post
you should be just about fine where you are currently... 2 turns out to start, go 1/4 in if it stumbles at idle, 1/4 out if it backfires at throttle down or returns to idle slowly.

Aftermarket needles are necessary if you open up the airbox.
awsome thanks for the advice
07-05-2017 09:10 PM
QuadManiac You should be just about fine where you are currently... 2 turns out to start, go 1/4 in if it stumbles at idle, 1/4 out if it backfires at throttle down or returns to idle slowly.

Aftermarket needles are necessary if you open up the airbox.
07-05-2017 01:22 PM
COLTONTOWNSEND
Quote:
Originally Posted by coltontownsend View Post
got a 150/155 main with clip in middle stock needle 25 pilots bike mod :k&n air filter with stock box hmf slip on exhaust stock motor, were should i start on setting my air mixture any help?
also do i have to get aftermarket needles to run the bigger jets?
07-05-2017 01:13 PM
COLTONTOWNSEND Got a 150/155 main with clip in middle stock needle 25 pilots bike mod :k&n air filter with stock box hmf slip on exhaust stock motor, were should i start on setting my air mixture any help?
This thread has more than 10 replies. Click here to review the whole thread.

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

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