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Given your expertise in chainsaws, I wondered if I could ask your opinion as to what might be wrong with my small basic model - I suspect it is the clutch but the limited paperwork on it gives no information on adjusting the clutch.
My saw is a Skilsaw (Skilshop) model 1712 Type 3
The engine works fine, the chain is sharp and properly adjusted, but it just seems to 'slip' and 'bind' when trying to cut.
Most clutches are self adjusting through the use of springs, so it is possible the clutch has worn out, removing the sprocket and inspecting the shoes would verify this. It could also be a worn sprocket, check the sprocket teeth, but if they look good it may be the clutch is worn. Some models have a replaceable sprocket if its just the sprocket others the sprocket is part of the rim and clutch. Large logs are not has hard on saws as the smaller green limbs. There are many places that offer parts, but eBay UK may be your best bet as it was a popular design not unlike many Homelite and MacCulloch models of the same era.