Hello,

have anybody used these kind of tachometers on Montesa 4RT engine ?

https://www.youtube.com/watch?v=u6-RZCjBvxc

I bought the same one but this has three settings:

 

Mode 1: spark plug fires twice per rev

Mode 2: once per rev

Mode 3: every other rev

Which one should go for Montesa 4RT ?

Thanks!

 

with my single cylinder close proximity tachometer I have to set the rpm to 900/950 to achieve the proper idle of 1800/1850 . this has led me to think its only firing on the power stroke somehow