My Old Johnson no spark on #2

[Bass AHolic]

1989 Johnson GT175 ser# 08205800 Mod# J175 STLCE

checked compression as follows 1-100 2-105 3--90 4-120 5-105 6-110
Have spark on 5 cyl no spark on #2 All New Plugs QL77JC4 2 years ago
TACH don't work - was a New Teleflex RED INT Tach to 7k replaced 2 yrs ago from ORM Original
Motor Runs Fine on Lake
Gear Case Clean no water, had it Serviced 2 yrs ago
3 way tank valve and all new Gas Lines/ filters 2 years ago
So my 3 Questions is: what can cause #2 no spark , and think compression still good ? Tach need another new one?

[hulapopr]

i would swap that coil out with one of the others and see what happens after
tracing and checking all wires and connections to the bad cyl.

[StarcraftSS]

Seems like you compression numbers are all over the place....not terrible, but a bit inconsistent. Might be time for a decarb.

I agree with Hulapopr....swap the coil with a known good coil and see if the problem follows the coil.

[316jughead]

Look at the primary coil wire connecter, if they get a little loose they will arc and finally get so bad they will not spark. They can be cleaned up.