Has anyone tried this jetting in their 06?

Has anyone tried this jetting for a 06?

This is from PC Jetting site

http://www.procircuit.com/PCJETTING.htm

Stock:

YZ 450F 165MJ 42NFPR PJ clip#4 Fuel screw2 55 LJ

P/C 170MJ 50NFPR PJ Clip#5 Fuel screw 2 1/2 50 LJ

I will try it this weekend just to see if it is better than my 170/48

50 pilot? I wouldn't do it. The 48 is too rich as it is. I would try 165/45. Eliminating all backfiring with a too rich pilot will just kill your off idle response.

lol, is it just me or is this 06 jetting issue never ending!! damn, it would be nice to haVE A setting that would work for 90% of my riding. :crazy:

lol, is it just me or is this 06 jetting issue never ending!! damn, it would be nice to haVE A setting that would work for 90% of my riding. :crazy:

You know the biggest problem with jetting, and other mods people do to their bikes? It’s the fact that it’s VERY HARD to objectively assess changes that you make to a bike. It cracks me up when I hear guys saying, “I changed my jetting and the next weekend I rode the bike ran WAY better”. WRONG. You cannot assess a jetting (or suspension, brakes, whatever) change with a week or more in between changes. Most guys have trouble accurately telling the difference in changes made while actually riding. If you don’t believe me, try this… Next time you go riding, have a buddy change the clickers on your forks or shock midway through your day, and don’t let him tell you what he did. Or better yet, tell him to try to make the change when you’re not looking. Then see if you can tell what he did. Is it softer, stiffer, quicker rebound? There are pro riders out there that are terrible at bike feedback, some people have it, and most don’t. Haven't you ever gone riding and thought "Damn, this bike is running good!", even when you didn't change anything? Used to happen all the time when I was riding 2 strokes, first thing in the morning when the air is nice and cool those motors would rip!

Years ago my buddy was complaining about his suspension being too stiff. I told him I’d soften it up, he asked me what I did and I said I turned the compression all the way out. He went out and rode it and said, “Wow, it’s much softer now.” Problem was I didn’t turn the compression out, I actually turned it all the way in! The power of suggestion was too strong for him I guess.

Back to the ’06 jetting, I went with the 170/48 combo when I first got the bike because I didn’t have time to mess with jetting myself. 2 weekends ago I spent 80 miles in one day trying different setups. I find a hill with decent, consistent traction and try to make consistent runs up it. Start in the same spot, same speed, same gear, etc. What gears will it pull? If you lug it in a high gear will it pull out of the bottom end or does it stay bogged down? In what gears can you hit the rev limiter? What does the idle do after an extended full throttle run? How low can you keep the throttle and still accelerate? How fast was the max speed?

Put all that in your memory banks, make a jetting change (preferably right there, without going back to the truck), and do 20 more runs up the hill to see what the difference is.

Then I’ll do the same thing on a section of track or trail.

That and about 50 other things and then you might be able to accurately assess jetting changes. If you don’t want to go through that much trouble, or you’re not sure you could accurately evaluate the changes, you just have to trust what others are running. Both the 170/48 or 165/45 combos are ok, neither one of them are going to make your bike that far off of perfect. If I switched between the 165 and 170 mains in 10 guys bikes (without telling them), I'd be surprised if 2 of them would guess which jet was which correctly.

Yea, id say changing the jetting on the 06 bikes are BS, the day i read that i checked my spark plug after about 3 rides and sure enough it was perfect. So if your undecided check your spark plug :crazy:

I am certainly no jetting expert, but you are blowing hot air if your trying to convince me I cant tell the difference. With the Rekluse, the bike is very sensative to jetting. I can definately tell the differences just in how the bike reacts with the rekluse. I have been trying to learn as much as I can, and have been playing with the jetting. What I have found best so far is 165 main, 45 pilot, and adjusting the fuel screw according to temp and alt. With the 42 pilot I had excessive popping and what felt like a loss of top end power. With the 48 the Rekluse was constantly flaming out due to a bad bog right off idle. With the 45 I have a little decel popping and great throttle response. The off idle bog is almost gone. The bike pulls through the whole RMP range. I have vid of a hill I run to feel the pull. I will try to post it. I start the hill pinned in 3rd and am low in the rpm range by the top of it and it still pulls great. Thats what little I have learned, but it all helps. :ride::crazy:

Has anyone tried this jetting for a 06?

This is from PC Jetting site

http://www.procircuit.com/PCJETTING.htm

Stock:

YZ 450F 165MJ 42NFPR PJ clip#4 Fuel screw2 55 LJ

P/C 170MJ 50NFPR PJ Clip#5 Fuel screw 2 1/2 50 LJ

I will try it this weekend just to see if it is better than my 170/48

I have 170 mj, 48 pj, clip stock fuel screw 2 1/2 out 55LJ.

I have had very good success with this jetting thus far. I have zero stalling or overheating issues. The bike makes incredible power throughout the power range and doesn't feel like it is starving for more fuel at any rpm. I may experiment with a drop down to a 45 PJ and mess with the leak jet as temps move higher here in AK with our continuous summer daylight. I think a good change for me was to go out further on the fuel screw like PC has listed here. Understand, it is still really cool here.

With the above listed jetting, I am usually popping on deceleration in the moring during practices with the cool temps, by 1st moto things have warmed up about 10-15 degrees (from 40's to mid 50's)and she is running fine again. The Anchorage track is a couple hundred feet above sea level.

This weekend (our second race) a squall blew in off the ocean right before the start of my second moto....the temps plummeted and I was popping again. It was well into the 40's by the end of the moto. It snowed that evening!

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