jetting question about FMF Powercore


3 replies to this topic
  • albertlui

Posted June 23, 2007 - 07:30 AM

#1

My bike is 06 WR450F, just changed to FMF Powercore with the stock headpipe. And then did some jetting. But the bike become slow respond in 0-1/2 throttle. And more difficult to pull up my front wheel. Can anybody advise me how to improve it? :thumbsup:

Old setting is:
Stock exhaust and removed all inserts.
Pilot Jet: 45
Main Jet: 168
Jet Needle: stock Pos 3
Fuel screw: 1.5 out

Now setting is:
FMF Powercore
Pilot Jet: 48
Main Jet: 170
Jet Needle: stock Pos 3
Fuel screw: 1.5 out

  • KennyMc

Posted June 23, 2007 - 01:45 PM

#2

I put the FMF Powercore on my 07 WR450 and at the same time did the following:

removed air box snorkle(sp)
removed grey wire
removed AIS system
installed JD Jetting
168 main
48 pilot
red needle 4th from the top groove
zip-ty fuel screw out 2 turns

The bike runs great.:thumbsup:

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  • trailordune

Posted June 24, 2007 - 01:15 AM

#3

My bike is 06 WR450F, just changed to FMF Powercore with the stock headpipe. And then did some jetting. But the bike become slow respond in 0-1/2 throttle. And more difficult to pull up my front wheel. Can anybody advise me how to improve it? :thumbsup:

Old setting is:
Stock exhaust and removed all inserts.
Pilot Jet: 45
Main Jet: 168
Jet Needle: stock Pos 3
Fuel screw: 1.5 out

Now setting is:
FMF Powercore
Pilot Jet: 48
Main Jet: 170
Jet Needle: stock Pos 3
Fuel screw: 1.5 out


Move your needle up 1 groove, notch 4 and go from there. The needle is definetely your problem.

  • albertlui

Posted June 24, 2007 - 03:44 AM

#4

kenshaw720, I had done all free mods, but I don't have the JD jet kit, so I am not sure how to reference your setting, thanks.


Move your needle up 1 groove, notch 4 and go from there. The needle is definetely your problem.


I found that the bike will be choking in high RPM if i put the needle higher. And the engine will be easier stall in fast open throttle. How to prevent this?




 
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