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albertlui

jetting question about FMF Powercore

4 posts in this topic

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

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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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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.

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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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