175 1985 Johnson timing

[yrag]

I have a 1985 175 Johnson 175 and can't find the correct wot timing.All information that I can find says to refer to decal on engine,I know that it said either 32 or 34 deg. shortly after getting engine I received a service bullitin that said to have dealership retard timing 5 deg.(I think)does anyone know what It should be set at,or is best for motor.I run regular gas.<br />Thankyou for any help

 

[clanton]

Re: 175 1985 Johnson timing

The only thing I fined is standard timing for 91 octane fuel, and retard 4 degrees from standard for 88 octane fuel.

 

[seahorse5]

Re: 175 1985 Johnson timing

Back then, OMC sent out large charts to dealers showing the new timing specs and which engines needed thicker head gaskets to use the new types of gasolines that came on the market. Timing on the engines was brought down to 28 degrees, if they were originally 32 to 36 degrees.

 

[clanton]

Re: 175 1985 Johnson timing

Thinks Seahorse helped my memory. SB 2155 engine modifications for 86 aki octane lead free fuel. Dated OCT 1986. Bulletin says no change for 1985 175 hp.Orignal timimg 34 degrees. Then came SB2159R1 dated OCT 1986 that says to retard timing 4 degrees for a minimum of 88 aki octane lead free fuel, which brings the timing back to 30 degrees.<br /><br />edited 7:09 EST

 

[yrag]

Re: 175 1985 Johnson timing

Thankyou VERYMUCH for the information.I've tried all local dealers and other sources to no avail until now.