so now it won't go over 2500 rpms...

[Johnny C]

so the starter is fixed, the plugs replaced. Now all of a sudden the yahmaha 150 2 stroke will not go over 2500 rpms when in gear. In neutral it revs up fine. then when we are looking to get moving...no go.
Trouble shooting tips?

[thefishingfreak]

could be the diaphram fuel pumps. they used to go on my yamaha250's about every year and a 1/2
causes a Whaaah-Whahhh-Whahh RPM fluctuation. can't get enough fuel.
search Iboats.com forums in the yamaha/susuki section

[Striper1]

Does sound like not getting fuel.....
have you recently changed you fuel filters?

Or maybe a spun prop ???

[Bigcat]

New plugs, could you have crossed a wire?