Can anybody answer this question?

[Newbie@boats]

Today out on the lake I noticed the boat was going a little slower then usual, so after I anchored I took the motor cover off checked the spark plug wires and stuff everything was good>

During the week I decided to put the air filter covers on(I was running the boat without airfilters which is the way I bought it) Well I thought I will see what happens if I took them off....since before I would run 35mph, with the covers on 30mph, took them back off I got 35mph again, then I left the motor cover off and I got about 38mph.....

Any body know whats going on? Motor seems to not be getting enough air or something??

 

[BuzzStPoint]

Re: Can anybody answer this question?

Most outboards dont have air filter. (due to a lack of dust and dirt on the water)

When you install an air filter, this block the air from entering the engine. Less air, equals less power.

 

[jerryjerry05]

Re: Can anybody answer this question?

Those black covers are there to keep big stuff out.If there is a difference when you put on the cover then your leaking exhaust into the cowl or the air ports are restricted.I'd go with the first one.No idea why there is a difference with the black covers.J

 

[wellsc1]

Re: Can anybody answer this question?

At least it's an outboard engine with air filter experiment. Inboard engines have them to serve as a backflame arrestor.