Pilot Jet Screw ? & stuff 03WR450F 160MJ, 48PJ
Posted February 23, 2003 - 04:01 PM
Posted February 23, 2003 - 11:36 PM
i think if you're on an open pipe that 150MJ at sea level is bordering on lean.
if you have a vortip and you live 3-5,000ft+ then i guess it's ok. however you should try slightly more air in the PAS at 60 or 65 OR try a 35 PJ.
i think that you should do the bump and grind yourself and try the different settings
Posted February 25, 2003 - 10:32 AM
Posted February 26, 2003 - 07:35 AM
Posted March 04, 2003 - 03:41 AM
Posted March 04, 2003 - 06:31 AM
I also see they've changed the part number classification for 450 needles...using 5TA as the prefix vs. the 426/400 classification of 5JG... Any idea on what this means?
Finally, Motorod...I cant believe that a 48PJ with a 70PAJ and N diameter needle works very well for you. 70PAJ sounds extremely rich when used with a 48PJ. I not trying to critique here...just getting a feel of how different jetting a 450 might be vs. a 400 or 426...
Just want to keep up on this stuff...
Posted March 04, 2003 - 10:26 AM
The only problem I have, besides suspension, is it is little hard to start, but once it warms up, no problem. I think I just need to get use to starting it, but I do have a 72 starter jet ordered (another UTVOLS suggestion). I have also been looking for a chart or something on these needles, but have had no luck so far. I have the same questions you have?
Posted March 04, 2003 - 10:21 PM
Finally, some camps go with the larger PJ/PAJ ratios for tractor like torque. Others go with the smaller PJ's/PAJ ratios for a "snappier" throttle response.
I cannot understand what do you mean by PJ/PAS ratio. Can you please clarify which is torque and which is snappier. For example with
Isn't leaner = snappier and richer = torque?
Posted March 04, 2003 - 10:28 PM
you'll be good for a PAS and a ratio of 40PJ and 75 (or 70 PAJ!)PAS.
why do you suggest different PAS(75) PAJ(70)? Is there any difference when using pas or paj?
Are you still using euro pipe and was it -5 on the main?
I want to compare my jetting in my elevation and air temperature with JDs .xls, so can you please provide temp and altitude info for your jetting?
Posted March 04, 2003 - 11:38 PM
first of all i sold the bike 14 months ago.
i am at sea level.
the difference in air is minimal between a #70 and #75. air is so light etc.
glad you pointed out that 70PAJ wants about 40PJ. this will work as long as the needle straight is not too 'fat' so it should be a M, N at sea level and whatever crazy needles you all use at 10,000ft! (P, Q).
there shouldn't be a difference between the PAJ and the PAS-we all hope not anyway!
my euro pipe meant that i was about 8 lower MJ than if i'd run a YZ pipe. but don't forget that i ran a 160MAJ which reduced my MJ by 10 anyway.
so if i'd been running a 200MAJ my main would have been a 160 and if i'd had an open pipe it would have been 162-165? (with an 'E' needle).
Posted April 04, 2003 - 01:01 AM
these are the settings i intend to use in my new WR450, euro specs, fully uncorked, air box mod done, akrapoviç full open pipe, yz exhaust cam. Can you give your comments??
-needle #CVP (yz450) 5TA-14916-VP clip 4
is there a main air jet (MAJ) on these carbs??
All input welcome!!
Posted April 04, 2003 - 09:01 AM
I think your MAJ is too rich but I think my PJ may be too rich also. Let us know how it works. Check my sig. for my current settings.
Posted April 04, 2003 - 03:53 PM
I got a wr400 and someone told me about a deely you can bolt on your carb that will shoot air under your slide and give considerably more power. I think its made by DSP
does anyone know any thing about it?