1995 mercury 115, comp 105,105,105 and 115

[LoneGunman]

I can't find anything in the manual that says what it should be. I searched on here and realise they are within 10% of each other but isnt 105 low?

Also, when I bought the boat and motor, the motor had the oil injection bypassed so I asked what the right mixture was, he said 50:1 but he always added a lot extra, wont this cause problems? The plugs are nasty looking so those Ill change, anything else I can flush or do?

 

[studlymandingo]

Re: 1995 mercury 115, comp 105,105,105 and 115

Yes the 105 seems a bit low. Did you check while the motor was hot or cold? Pressures will be higher at normal operating temperature. Also, you might try a decarb, could bring up the pressures a bit also.

 

[LoneGunman]

Re: 1995 mercury 115, comp 105,105,105 and 115

The motor was checked cold, Ill recheck it again warmed up.