Could be your plugs mate in regards to the warm starts, my 20 year old victa 2 stroke mower starts first go when cold, will not start hot, I just have a spare plug in my pocket. Change it and it starts first pull. A colder plug may help. In saying that I do use the correct plug so there is probably more to it than that. Obviously victa 2 strokes and barras are very similar....lol