RPM problems with 40 hp yamaha 2 stroke

[nbrackin]

When at crusing speed , aprx 4000 rpm ,sometimes rpm will drop to 3200 rpm and when i increase throttle to wot does not increase but very little, However I
can pull throttle all way back and then to wot and will run ok for few minutes and then same thing happens all over again.I have cleaned carb.s and new plugs to no avail .
1999 model 40TLRX

P.S. Sorry Scottie and J.B.I did not intend to double post or pirate thread. I am very new to site. Again I apoligize

 

[JUSTINTIME]

Re: RPM problems with 40 hp Yamaha 2 stroke

Re: RPM problems with 40 hp Yamaha 2 stroke

when this happens try squeezing the primer bulb
it will either drop down or pick up

also try pushing in the choke, if it has solenoid choke, some have a primer choke since u never stated the year

let us know how it turned out

 

[nbrackin]

Re: RPM problems with 40 hp yamaha 2 stroke

When at crusing speed , aprx 4000 rpm ,sometimes rpm will drop to 3200 rpm and when i increase throttle to wot does not increase but very little, However I
can pull throttle all way back and then to wot and will run ok for few minutes and then same thing happens all over again.I have cleaned carb.s and new plugs to no avail .
1999 model 40TLRX

P.S. Sorry Scottie and J.B.I did not intend to double post or pirate thread. I am very new to site. Again I apoligize

 

[Silvertip]

Re: RPM problems with 40 hp yamaha 2 stroke

Fuel pump going bad or possible debris in the tank that is partially clogging the fuel pickup tube.

 

[Ray Neudecker]

Re: RPM problems with 40 hp yamaha 2 stroke

As Silvertip says the signs are of a fuel restriction.