No power under load

[dvogtvpe]

Would that be true if I am measuring the positive terminal? The 123 measures open when I go to the positive terminal but obviously measures just a few ohms on the negative (points) side

if the wire from the neg side of the coil is hooked up and the points are closed . yes it would. and it would be real close to the reading you would get going from + to - at the coil.

[NCDiesel]

As I mentioned in an earlier post, I'll be too busy to mess with the cub for a few days, but I did have 10 minutes last night. So I tried the throttle cable idea (increase tension on the spring) since that would be a quick experiment. I think this did help. Of course, as soon I tried a quick mow, the belt jumped off the deck, laid up on the muffler and burnt itself )-: So nothing definitive but before the belt jumped the mower clearly spun up the blades faster than it did before. I had to stop at that point.

I'll keep everyone informed. The belt did not burn through so I'll investigate this approach more the next time I have two minutes to rub together.

Thanks!

[NCDiesel]

Thank for your patience during the hiatus. Got some time to work on the cub and here is what I found:

1 - Put in a known good coil and plug - no change.
2 - Went back over governor linkage and again - this seems to mask the problem a little but I have a very high idle and it does not solve the problem.
3 - Adjusted the carb again. Found the idle screw was off my previous adjustment because the spring broke. Fixed that but in the end - no change.(no change in idle either- which is weird).
4 - Static timed the engine. Wouldn't start and kicked back during start so ignition was to far advanced. Resulting points gap was .024" - too much.
5 - Timed using points gap method only. Runs great again, but once again - no power under load.

I am beginning to suspect the carb - high speed jets plugged or something. Any ideas?

Thanks in advance!

[dvogtvpe]

as I mentioned in an earlier post, I'd be looking at the fuel supply. sediment bowl clean? petcock open all the way? good flow of fuel , carb clean? you may want to check around the head area for a leaking head gasket. often times after rebuilds people don't retorque the head after running the engine for a while.

[cubs-n-bxrs]

Just a thought but maybe you have water in the gas. That will give the same symptoms.

[NCDiesel]

OK, runs great now. Of course, out of desperation I tweaked 2 or 3 things, so I am not sure what fixed it:

Went to .022 timing gap. Going with .020" yields no power, while static timing with the ohmmeter yields a .024 gap and was advanced so far it would kick back on starting. So I decided to split the difference.
Adjusted throttle cable yet one more time. I did have to move it, like the cable slipped through its retainer
Changed governor spring down one hole on throttle cable plate/arm


So either a water bubble cleared from a jet, or throttle cable is my guess.

Either way I am happy!

Thanks again for all the help,

[cstover]

Thanks, everyone. My 149 is doing the same thing. I'm going to try the steps explained above.

[ARCubfan]

Originally Posted by vartz04

Even though I adjusted my governor multiple times Istill had the same problem you are having. Turns out iI didn't have the throttle cable adjusted properly so it wasn't putting enough tension on the governor. After adjusting the throttle cable to out slight tension on the spring my engine no longer races and as the load increases the governor moves and keeps the power right where it needs to be.

I was having to constantly adjust the throttle position as I mowed prior to doing this now I just rev it up and go.

Adjusting my throttle cable helped my 129. thanks for that tip.