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NO!!!! you want MORE oil, not less!!! If the "correct" ratio is 40:1
Question: The engine ran on a 40:1 mix, would a 50:1 be too much of an increase?
I suggest DECREASING the petrol content of the mix to ,say, 30:1 (30 petrol to 1 oil) 50 would be much less oily, and lead to premature wear. as previously stated,adding extra oil will obviously lube the engine better,it will run a bit cooler and also smokier. the only possible down-side is that the plug will oil up in which case fit a "softer "plug. I have had a motorbike and an outboard that ran 16:1 (1/2 imperial pint oil to 1 imperial gallon petrol) smoked like a bugger and dripped carbon-y oil everywhere,but didn't wear out you will get a build-up of chocolate-brown carbon on the central nose,-this can be scraped/wire-brushed/sandblasted clean,if needed.
I'm still gobsmacked at a 50 hr. design -life.-It's like buying a cheap car and throwing it away after only 1,500 miles !!
WD works because it has a highly inflammable,volatile solvent,as well as a lubricant. IMHO It's much kinder to start reluctant diesels with a whiff of WD, than the usual ether spray. Ihava also had success with a petrol-soaked rag held over the air inlet so the engine sucks in the concentrated fumes Rough but effective!