Paul,
Have you check the cylinder compression or had a look at the inlet & exhaust valve seats. It sounds like the inlet valve could be slightly damaged.

Let me know how you get on.

Regards,
Bruce

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Commercial Outdoor Power Equipment P/L.

Ph: +61 2 9713 4699
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Regards,
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Bruce


Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.