90 Force alarm

[91Force]

Gidday

I bought my first boat about 6 months ago with a 90hp Force motor. since i purchased it ive clocked up around 20-30 hours on it with no problems at all until now , i took it out to the lake and its been having a few issues , generally i like to launch and let it idle for 5-10 mins and warm up then go out but lately after the 5 mins its been running like a bag of cr*p , only getting 30-40% power , when i open it up and gains speed it drops off back to near idle , 10 mins after trying different things it starts a continous alarm , so i take it back in , shutdown and leave for 10mins then start up again , no alarm no power loss at all runs perfectly fine and did for the rest of the day.

Im currently in the process of replacing thermostat , Impeller and plugs/leads but they all appear to be fine , oil level and color are all normal. although i did find on the impeller gasket a slight nick where it looks to have caught something and slightly bent it (not sure if that is suppose to be like that or not) but no damage to the impeller itself apart from being a tight fit.

any suggestions?

 

[91Force]

Re: 90 Force alarm

to add to my last ive been looking at the prop while the lowerunit is off and when i turn the crank the prop doesnt spin is that normal? apologies in advance for my inexperience

 

[jerryjerry05]

Re: 90 Force alarm

That impeller is SHOT!!!!
The vanes should be straight out not curved.
Continous alarm is an overheat signal.
You need to replace the wear plate and the gasket.
You can NOT start it unless the muffs are on or deep in a bucket.
The prop won't turn unless it's in gear and turning the right direction.
Since you got it hot.You need to do a compression/spark test.

Always add the year,model,serial#
Profile? Location.

 

[91Force]

Re: 90 Force alarm

im replacing the impeller and gaskets now so no doubt that will helping the cooling issue , as for a compression test i was thinking the same thing to be safe.

Serial 25518
Model 903E91D
1991 90HP Force