i need help

[hicks800]

i have a 1996 procraft with a 175 mariner im not sure what to do at full throttle it says im running 12000 rpms wich i know needs to be 6000 to 6500 would my gauge be bad i have a 25 pitch 3blade stainless prop calm water runs high rpms choppy water runs lower rpms but still over 7000 what am i to do how do i tell if gauge is bad or need a prop or what dont know please help

 

[jeffersondodson561]

Re: i need help

Your pole position is incorrect on the back of the tach or is malfunctioning. Someone may know off hand the pole postion for Mercs, but if you provide S/N I can help.

 

[hicks800]

Re: i need help

the only thing i could find on the tach was 825282/036/96 theres a knob at the top and a type of knob at the bottom

 

[jeffersondodson561]

Re: i need help

The pole position selector is usually on the back of the tachometer, adjusted with a small slotted screwdriver. Common positions are 6 and 12 pole.

 

[hicks800]

Re: i need help

yes everything is great motor runs strong i can get it up to about 64mph but it says rpms r 12000 dont want to blow it up

 

[Chris1956]

Re: i need help

There is a prop calculator which you can use to estimate the RPMs. Do a search for it. You can enter speed, gear ratio of 2::1, and prop slip of 10% and it will tell likely RPMs. Now if you can get your tach to read close to the prop calc, you can feel that is is likely correct. 12P is the normal seting for Mercs. What brand of tach do you have?