Personally I'm with grumpy and Bob on this one, The "ultima" or "vector" as they are called in the US are some of the most problematic and shoddily built engines you could ever find on a lawnmower, so I'm sorry to say but its a shame you put any money in it at all, because its really not worth it...
As Bob said if it has a Alloy base repower it, but if it has a steel base..... tell the customer to buy a new mower...
Kori
