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Thanks for all the replies. Decided to remove head as all spindles were nearly 180 deg out and hot air gun wasn't hot enough. Found exhaust valve guide loose in the head and 2 tappets fitted back to front. The guide is worn internally too, so hopefully that explains the oily plugs and exhaust port.The previous owner had seized the motor due to a broken oil line and had a full rebuild done by a bike shop, new barrels, pistons, bearings, etc. Found head nuts upside down, metal swarf in the pressure relief valve, as well as a surprising amount of metal in the bottom of the oil tank. Did run and sound OK so think it just wasn't cleaned out properly. So much for a 'professional' $6000 rebuild.
Thanks for all the replies. Decided to remove head as all spindles were nearly 180 deg out and hot air gun wasn't hot enough. Found exhaust valve guide loose in the head and 2 tappets fitted back to front. The guide is worn internally too, so hopefully that explains the oily plugs and exhaust port.
The previous owner had seized the motor due to a broken oil line and had a full rebuild done by a bike shop, new barrels, pistons, bearings, etc. Found head nuts upside down, metal swarf in the pressure relief valve, as well as a surprising amount of metal in the bottom of the oil tank. Did run and sound OK so think it just wasn't cleaned out properly. So much for a 'professional' $6000 rebuild.
