90hp v4 not reving full

[richelly]

i have a 90hp johno but will only rev to 2500 ihave changed the spark plugs but havent had time to see if thats help. also checked fuel filter and fine.is there anything else that it could possibly be!can some one please help me locate where to check the gear oil?any help is much appreciated!your info and help enabled me too get back on the water quick last time thanks!!

 

[Walker]

Re: 90hp v4 not reving full

Make sure your throttle linkage is opening the carbs all the way. Make sure the timer plate is advancing with the throttle. You can watch the linkage move without even starting the motor. If all is well there, then go to the basics, Compression, fuel/air, spark.

 

[Rbsgfd578]

Re: 90hp v4 not reving full

I have the same exact motor and had the same problem and Thanks to the great guys here we got it straightenend out..<br /> Check and make sure you are getting good fire on all 4, thats where my problem was.<br /> Hopefully this will help ya.

 

[R.Johnson]

Re: 90hp v4 not reving full

If it peaking out at 2500, it is going into SLOW, you could have a faulty heat sensor that is doing this. Are you getting a warning horn?

 

[richelly]

Re: 90hp v4 not reving full

thanks for the replys!as for a faulty heat sensor ,there has been no warning horn or any other noises from the motor.as for the other suggestions i will be sure to check 1st thing tommorrow!Can someone please help me to locate were to check the gear oil!

 

[Solittle]

Re: 90hp v4 not reving full

There are two stainless flat head slotted screws (or plugs) on the gear case for the oil in the gear case. The lower one is low and towards the front and is used to check and drain the oil. The other is above and on the side and used as a vent when filling the gear case. There is an o ring that must be replaced each time you open these. There also is a Phillips head screw in the lower unit. Be careful NOT TO take this out as it is for internal parts in the gear case. Often they are difficult to remove and tend to bugger the slot in the head. The way to avoid this problem is to use an impact driver to loosen the plugs.

 

[Walker]

Re: 90hp v4 not reving full

Go buy new plugs. They take allen wrenches now instead of screwdrivers.