Hello
I discovered that I had different valve springs on my 7-35 (weak & hard)
I bought 14 new springs updated, for all is a bit harder.
Result, the engine runs better and more responsive throttle.
So you who have an early motor 7-35 chek if the springs are soft.
You will notice a difference
I bought my engine in December 2010
I have made a tool for changing the springs without taking the engine apart
Lars