I'm voting clogged pilot jet too.
I put a Q-Stealth on my '05 MC 250. There's a lengthy thread about it... this is midway through it...
http://www.gasgasrider.org/forum/sho...ht=fmf+stealth
Turbine Core II blew 92-96dB depending on age of packing.
Q-Stealth blew 86dB first test after install
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Ross
'05 MC 250
'91 Husky 610wxe
'04 Duc M800 R.I.P
'06 Duc S2r 1000 R.I.P
'07 Duc S2r 1000 still rubber side down...
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May be so... May be not so...
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