Question about engine timing...

[Speedcop]

Hi All,
I am going to be boating at a height of 5,250 feet above sea level.
I normally operate at 500 feet or at sea level. Is it necessary to alter the spark timing on my 1999 Yamaha 130 BETO - (2 stroke), or should I leave it at factory specs?
The motor is running 100% at present.
Thanks in advance.

[rodbolt17]

no ign adjustments but you may have to reprop it.

[Speedcop]

Question about engine timing..

Thanks Rodbolt,
I am running a standard stainless 19 inch prop and I have a stainless 17 inch prop which I'm sure should be satisfactory at high altitude. Thanks for your reply.