Setting Points / Timing on 1650

cleon001 · #1 02-27-2011, 09:33 PM

I am in the process of installing new points on a 1650. I am following MattG's awesome timing guide using the multimeter method. I have found the "S" in the sight hole by rotating the engine by hand and can see the multimeter go from zero to infinity resistance when the points begin to open. But, how does one know where / when to set the maximum point gap 0.020? I understand the goal is to have the points just start opening/breaking when the "S" is in the center of the engine sight hole but how do you know when/where to set the points to the maximum gap 0.020 so that the points will just start opening/breaking when the "S" appears in the center of the engine sight hole? Any advice and guidance is appreciated.

Thanks

Cleon

_DX3_ · #2 02-27-2011, 09:36 PM

If the points are just starting to open when the 'S' is centered in the window, they are set. No worrying about .020 setting. Some motors will require less or a bit more than .020 to have the timing set.

Methos · #3 02-27-2011, 10:00 PM

Quote:

Originally Posted by _DX3_

If the points are just starting to open when the 'S' is centered in the window, they are set. No worrying about .020 setting. Some motors will require less or a bit more than .020 to have the timing set.

What he said.

cleon001 · #4 03-02-2011, 10:27 PM

I figured out when to set the max gap on the points. I watched the points as I rotated the engine by hand and eyeballed when it was at its largest gap. I then set the maximum gap and used the multimeter to determine when the points were just starting to break. I ended up with a gap of .025 and the "S" centered in the engine sight hole.

Thanks

Cleon

darkminion_17 · #5 03-02-2011, 10:29 PM

How well does it run when you gun the throttle?

cleon001 · #6 03-02-2011, 10:59 PM

darkminion_17,

I did the point tuning to try to solve a Glowing Muffler issue. I have another thread open on that issue. Engine now starts on the first try without any choke. Engine runs very smooth at low speed but as the throttle increases the engine runs kind of rough at higher throttle. I also notice a chirping/knocking sound when it starts (like 2 seconds of quick "Chirp Chirp Chirp"). Only hear this chirping when it starts. I adjusted the main jet on the carb 3/4 counter clock wise to make it run richer. Engine now runs smoother at higher throttle but still has an occasional miss? like "pa pa pa -- pa pa pa pa --" only at higher throttle very smooth at lower throttle. The good news is the muffler is no longer Glowing Orange! I definitely see the benefit to tuning the timing even just from a starting standpoint.