fatty JR

Hello out there, For the past week, I have been trying to trace a problem with my XVS650. After replacing the front forks for a set off a XVS1100 (after a little machining) so I could have twin brakes up front, I got the bike out for a test ride and it started bellowing smoke out the rear cylinder. Basicly, I have done every I can think of without resorting to pulling the engine down for inspection (pity as it's only got 4500 miles on the odometer) Anyway, I have priced up a full engine gasket set for the bike and they want nearly £200 ($320+) for the set which is BLOODY expensive. I have been searching for just the top end gasket set and NO-ONE I have spoken to in the uk does just a top end set. I can buy the individual gaskets from yamaha but works out the same price as a full set. Dennis kirk do one For $118 Well not being the type of person to be ripped of if it can be helped, I have been told that the 650 engine is basicly a bored out and stroked XV535 virago engine. I can buy a top end kit for the virago for £53 or a complete set for £43 ( don't know how that works). Does anyone know if I could use the virago top end set on the 650?