Mate, put a fat earth wire from the earth terminal on the battery to the bolt that holds the starter in. An extra earth is ok. It will then make a good circuit and should crank faster.
If its still not cranking fast enough, take out one spark plug and try it with just 3. I have started many a reluctant motor this way. Once it fires first time, stick the plug back in and you are done.
Let us know how it goes boy wonder
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