I have a 1988 yamaha phazer pz480, last season i ran it stock and it topped at 140.
now over the summer i have put into it a dg pipe and also aftermarket filters.


i pulled it out of the garage yesterday and decided to see what it has, so it starts first pull and idles perfect. it has tonnes of power and it will carry the skis right till 80km/h. but around 90-100 it loses its push and barely goes past 105, im not sure what would cause that... the only thing is i havnt jeted it, it has currently 145's in it and they are the small hex size, it is twin carb and im not sure if that could be the problem or what size to go to, so if u have any suggestions please, help me

what size of jets would be a good estimate to try

also if i do jet the carb what else would i have to change besides the main jet, and how do i test that the jet size is good


THANKS FOR YOUR HELP

With my exciter i had to go 2 sizes bigger on the main jet they are cheap to buy just try the next size up and check your spark after running wide open to see if it is running to lean.

what would be a ideal colour of plug to have

what would be a ideal colour of plug to have
Tan in colour