Frost987
27.04.2021 5:49:50
Here's some info that should help clarify:
See full version: Mercury Mark 30 Timing
Here's some info that should help clarify:
One, we took the mag arm apart, machinged agroove in the arm , then threaded a 1/4 boldt in to hold it.
Two, we used o-rings around the mag vents to a 1/4 20 bolt above the mag to support the mag arm.
Sorry, I'm not helping here. You'll need a dial indicator, we used to run about .400 to .500 advance with HO-3 Champions. But normal use should be about maybe .300 with probably L77 JC -4 Champions. here
You want to set your timing at 28 or 30 degrees BTDC using the starter with the trottle at WOT. This will give you 30 or 32 degrees BTDC running at WOT. You will need to jumper the neutral safety switch to do this. here
The flywheel rotates clockwise so the first mark that you see that crosses the mark on the crankase would be the most advanced timing possible. In your case it is marked 40 degrees which would be 40 deg Before Top Dead Center BTDC. The last mark on the flywheel, which should be separated from the other marks will be the 0 or Top Dead Center TDC mark. here
There are a bunch of marks on the fly wheel it goes 40, 30, 20, 10, 0, 10, 20 with 4 tick marks in the middle of each. I believe it has to be set 28 degrees retarded. more
If your idle link and sync adjusment is correct, you will seel 0deg to -2deg using the starter with the trottle at neutral. [links]
If you read 28 with the trottle at WOT, you were reading 28deg BTDC. You can leave it there or adjust the additional 2 degrees. Don't go any further as the gasohol we are using today does not have the anti-knock qualities that earlier gasoline did.
Is there anyone out there that has done their own link and sync (and thus has set their own idle speed timing) that could provide some answers based upon their own experience in setting their idle speed timing?
Now I understand how to interpret the idle timing spec and why it is a range rather than a singe specific value. I was pretty paranoid on this particular spec as I didn't want to screw up my motor with a bad idle timing setting due to my lack of knowledge. more
Sorry, but thats just not true. [links]
Set the breaker point gap for the smaller 2-horsepower, 2.3-horsepower and 3.3-horsepower Colt Jr. motors with a 22 microfarad to 26 microfarad capacitor, at 0.008 mm. Set the breaker point gap for the 3-horsepower and 4-horsepower Colt, with an 18 MFD to 22 MFD capacitor, to 0.022 mm.
Set the idle speed for 30-horsepower and 55-horsepower motors between 725 rpm and 775 rpm. Set the idle speed for motors 60-horsepower to 70-horsepower at 750 rpm to 850 rpm. The idle speed in motors above 70 horsepower is pre-set and controlled by the motor's electronic control unit, and is non-adjustable. [links]
The tune-up specifications for Evinrude outboard motors include the ignition timing adjustment, the idle speed -- which is electronically controlled in motors above 70-horsepower, the magneto breaker point gap for the smallest Evinrudes -- the Colt and Colt Jr., and the valve clearance for both intake and exhaust valves for all motors.
Set the timing for 30-horsepower and 55-horsepower motors between 0 and 2 degrees after top dead center, or ATDC, at a motor speed of 725 rpm to 775 rpm, and 18 to 20 degrees before top dead center, or BTDC, at 4,500 rpm to 5,000 rpm. For 60-horsepower to 70-horsepower motors, set the timing between 1 and 4 degrees ATDC at a motor speed of between 750 rpm and 850 rpm; at 4,500 rpm to 6,000 rpm, set the timing at between 18 and 20 degrees, BTDC. Set the timing for motors above 70-horsepower at 1 to 4 degrees ATDC at a motor speed of between 750 rpm and 875 rpm and 19 degrees BTDC at 5,500 rpm to 6,000 rpm. more
Set the valve clearance to 0.003 mm at intake and 0.005 mm at exhaust, for motors up to 9.9-horsepower that were built after 1998. For those built prior to 1998, set the valve clearance to 0.004 mm at intake and 0.006 mm at exhaust, for the 9.9-horsepower and 15-horsepower motors. For 25-horsepower to 50-horsepower motors, set the intake and exhaust at 0.009 mm. For motors 70-horsepower and above, set the intake at 0.005 mm and exhaust at 0.006 mm.