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Help..... Bad Misfire

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Anyone know what might be causing this....

'04 WR450 symptoms:

At between 20-25 mph, seems to be a complete misfire or very bad stutter resulting in a jolt every 20 yards or so.... at higher speed it's OK.

Jetting - OK with PJ/PS/PAJ: 48/1.5 turns/100, Needle/Clip: EMN/4, MJ/MAJ: 170/200, LJ: 40, Idle: 1800 rpm (approx).

CDi output voltages - OK


Coil secondary winding - OK, unable to check primary winding as meter is not accurate enough.

Plug - OK

In the middle of checking all other wiring, connections, grounds etc - haven't found anything obvious yet.

Any help out there....


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I know you say you've checked, but sounds like plug or bad ground connection to me.

Similar to bad ground connection, any water in the plug well?

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