Tach reading high

[chadbenton]

I have an 88 XR2 150, just started it on muffs, first run since last summer. At idle my tach is reading 3000 rpms.
The only thing I have done is remove my oil injection and the lubalert module. Any suggestions on where to look first. Or just possibly a bad tach.....

 

[Silvertip]

Re: Tach reading high

Check the back of the tach. Depending on which manufacturer it is there is usually a calibrationi dial back there that adjusts the tach for a specific number of pulses which corresponds to various alternator output pulses. I think yours should be set to 6P,.

 

[lp142]

Re: Tach reading high

I got the same problem i have 1966 Model 1100 6 Cyl, the tach that I'm trying to install does have the adjustment screw, anyone knows what it should be set at?

Thanks

 

[Scaaty]

Re: Tach reading high

I got the same problem i have 1966 Model 1100 6 Cyl, the tach that I'm trying to install does have the adjustment screw, anyone knows what it should be set at?

Thanks

12 pulse

 

[Scaaty]

Re: Tach reading high

Check the back of the tach. Depending on which manufacturer it is there is usually a calibrationi dial back there that adjusts the tach for a specific number of pulses which corresponds to various alternator output pulses. I think yours should be set to 6P,.

No clue on your pulse for that motor, but you can change it (tach setting) while the motor is running to check

 

[ricksrster]

Re: Tach reading high

12 pole or 6 pulse. Sometimes labeled 6P