Don't buy one... I used my brand new one for about 20 minutes and it cut out. I'm no stranger to fixing engines so rather than sending it back to China, I sorted it out myself... There was a problem with the coil. I searched for a replacement coil from various Silverline dealers and they all told me that the replacement part was not a stock item.
I fitted a coil from another machine and eventually started the Silverline by turning the engine over with a power drill, a trick of the trade. It started... I used it for another 30 minutes and the gearbox spilled all the oil, it now sounds like someone's trying to break out from the gearbox with a hammer! Anyway, because the gearbox is beyond repair and is too much for the engine to drive, it won't start again. What a pile of rubbish it is. I'm now in dispute with the retailer who said because I didn't return the machine to China and have it repaired "professionally" the guarantee is void. Who would have thought that, no surprise really.
Don't waste your money, I did...!