Spark Advance timing - Joe Reeves Procedue 1990 90hp

[emmo1210]

Hi all,

Could anyone familiar with the Joe Reeves Wide Open Throttle timing procedure help me out here.

When it says to have the throttle wide open, then set the spark advance, does this mean to
a) have the throttle open against the WOT stop screw or
b) have the WOT stop screw fully in, throttle open against it (ie carb roll pins past verticle) and then set spark adance.

Obviously with the screw fully in there is some travel of the spark advance past where the WOT stop screw allows the throttle to advance to.

Hope that makes sense.

Thanks
Emmett

 

[Keepi time]

Re: Spark Advance timing - Joe Reeves Procedue 1990 90hp

I have an 89 v4 let me know how it goes for you!

 

[Haffiman]

Re: Spark Advance timing - Joe Reeves Procedue 1990 90hp

You give full throttle on the handle, the timing base plate should go to stop on the max timing set-screw.
Then adjust the set-screw to specific max timing advance.

 

[emmo1210]

Re: Spark Advance timing - Joe Reeves Procedue 1990 90hp

Haffiman,

Thanks for reply, however its not exactly what i need.

On my motor there is a difference of about 4 degrees on timing between throttle at absolute advance postion and throttle against WOT stop, I need to know should i be looking for the 24 degrees when the throttle is against the WOT stop or past that.

Thanks
Emmett

 

[Haffiman]

Re: Spark Advance timing - Joe Reeves Procedue 1990 90hp

When you give full throttle, the timing plate should go to the stop screw.
When cranking and with timing light connected, adjust the screw so timing light shows specified MAX timing - 4 degrees.
The timing plate is spring loaded and should be in contact with the screw at all times when in WOT!
If the plate does not go all the way to the stop screw when in WOT, something is not correct (link adjustment, binding wires??) as the max timing should be obtained before carbs are fully opened.

 

[emmo1210]

Re: Spark Advance timing - Joe Reeves Procedue 1990 90hp

There is no full spark advance stop screw on this motor. Nor the is the timer base spring loaded.

How i originally set the full spark advance was with throttle lever fully down, set the timing as per procedure.

After this i then set the WOT stop screw below the throttle lever, which has pulled the spark advance back by 4 degrees, ie with the throttle lever against the WOT stop, the timing would be reading 20 degrees

 

[Haffiman]

Re: Spark Advance timing - Joe Reeves Procedue 1990 90hp

Throttle stop = WOT = carbs fully open.
#101 adjusted to MAX timing advance. (with Joe Reeves, -4)( #104)
Remember to first set pick-up timing (mark on #78 aligned with roller on carb), adjust with #89.
(Throttle cable NOT attached)
Slightly tricky to balance off all the adjustments, but in your case they are definitely off and most likely you have missed in the balance of pickup-timing, #89. #78 and carb roller by not leaving enough travel to obtain max advance.
http://www.marineengine.com/parts/j...urer=Johnson&section=Cylinder+&+Crankcase

 

[emmo1210]

Re: Spark Advance timing - Joe Reeves Procedue 1990 90hp

I carried out the tuning sequence as in manual;

1.Set timing pointer
2. Throttle valve sync
3. Cam follower pickup
4. Max spark advance
5. Cam follower pickup
6. Set WOT stop

All was fine until I had to set the WOT stop which subsequently didn't let the throttle lever travel fully around. I will redo the whole procedure

"Throttle stop = WOT = carbs fully open"

I set the throttle stop so that the carb roll pins stopped at vertical and not passed vertical. Are you saying I should set the WOT stop first?

Thanks
Emmett

 

[Haffiman]

Re: Spark Advance timing - Joe Reeves Procedue 1990 90hp

It is a bit 'tricky' to balance of the different adjustments. The max timing will normally be a bit BEFORE the carbs are fully opened. The tricky part is the follower that runs in the space-out curve in #82. At idle you must be very close to the start of the movement here or you may run out of travel for max spark advance before you hit WOT stop. Check that plastic bushings are not worn out and makes it all wiggly.

 

[emmo1210]

Re: Spark Advance timing - Joe Reeves Procedue 1990 90hp

Ok, I will set all again.

Just to clarify, if i have it set up correctly then, when the throttle lever has been fully advanced (the plastic follower is at end of space-out curve in #82) the carb roll pins should only be vertical (indicating fully opened) and not past vertical?

Thanks

 

[Haffiman]

Re: Spark Advance timing - Joe Reeves Procedue 1990 90hp

Yes, carb plates should be 99.9% opened and not 100.1%, or 'pin' vertical. If not mistaken there are some initial measurements for the adjustable rod settings in the OEM manual, but I do not have them. Just remember it might be a bit playing around as sometimes it seems the idle screw is too 'short' or other specifications gets 'out' like your WOT timing.

 

[lexer440]

Re: Spark Advance timing - Joe Reeves Procedue 1990 90hp

Wide open Throttle, WOT, should be set so the carb butterflys are fully open without going past (overloading), WOT timing is what you are trying to set and the timer base will fully advance before the throttle butterflys are fully open. to use JR's method disconnect the cable and hold or wire the throttle lever against the stop, reconnect when your done.