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Yeah I can do that.
Plugs have been very sooty/oily and getting that way very quickly.
Bikes start easily on a clean plug and run for 10 min or so but then start to bog down etc, won't restart if you stall. Whip plug out at this point and it'll be minging.
Plugs in the bikes I ran sans air filter were a more toffee brown colour.
I could do jetting but I've been protesting for a while they are wrongly jetted and supplier denies it. Supplier o think is also on here so not going to say much more about it.
All sounds a bit beyond what I'm comfortable with when the bike isn't mine. I'm trying to get a motorcycle mechanic on contract to look after them, just wondered if they could be made better with a light tinker.