retarded F40TLRC

[Henry D.]

Have A F40 Yamaha that Ignition timing is running 5*retarded instead of 5* advanced. Have replaced flywheel sensor & CDI unit (no help).anybody run into this before?
New find: If I disconnect the thermo switch the timing retards to 10*???

[99yam40]

My C40 starts and warms up at 5-7 BTDC but after warm up idles at 7 ATDC .

It is designed to do that. have you checked your manual to see what it says?

[Henry D.]

F40 retarded

My Yamaha manual calls for 8 to 28 degrees btdc

[boats.net]

At idle it will run about 5 degrees before top dead center.

[Henry D.]

At idle it will run about 5 degrees before top dead center.

Got any suggestions to change timing from 5*atdc to 5*btdc. have replaced pulsar coil & cdi unit. Thermo switch checks out for resistance. Oil press switch is closed (engine off) & open (engine on). My manual indicates it should the opposite.