Idle speed on a 1986 35 hp

[Spindle]

I have a 1986 35 hp Mercury engine I just installed a Tiny Tach on. It show the engine is idled at 1000 rpms. I need to know what the tach should be showing. It came from the manufacturer set at 360 degrees [1 spark per revolution]. I extended the wire lead by about 18 inches with stranded wire and it seems to be working correctly while running the engine on water muffs. I haven't had a chance to try it out on the water yet. Thanks

 

[schematic]

Re: Idle speed on a 1986 35 hp

1000 sounds reasonable.
When installing a ignition driven tach on any marine application, it is wise to check the accuracy of your installation by utilizing a optical tach to compare readings. As you probably noticed, length and position of sensor wire effects readings. A optical tach can be purchased from ebay for about $12.

http://www.ebay.com/itm/Digital-Las...367?pt=LH_DefaultDomain_0&hash=item3f1b4643d7

 

[Texasmark]

Re: Idle speed on a 1986 35 hp

If in N you are fine. This translates to approx 700 rpms when in the water and in F gear which is where my service manual says mine should be........essentially fast enough to not die at idle or starting acceleration, but not so fast as to crunch your gears.

Mark

 

[Spindle]

Re: Idle speed on a 1986 35 hp

Thanks guys. I was concerned about my adding the extra pick up wire.