from what I have read yes if you switch it off before its hot, too much unused fuel gets pumped in to the chamber and causes flooding another wear on the engine. doesn't take long to get to temp probs switch on to temp around 5 mins or so. and the whole rev it to 3-4000revs before switching it off is a big argument point on forums as some says its best to do it others say its a myth and they've never done it. its the same as premixing some do some don't argument follows.
and again from what I have read no it cant be hidden, fitting new starter from newer model will mean it just cranks quicker, older models crank a lil slower, so when its switched off and tried to turn on it will still take 5-10 sec to start if it starts. as the problem is it gets flooded and refuses to start.
haven't really driven it much but most say 19-24mpg is good. but as you need to redline on a daily basis your never gonna drive it conservatory. also it going less n less mpg is another sign of wearing parts.
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