Hunthard65 - Low WOT

[Hunthard65]

Force 125 will not get over 2500 rpms

 

[jerryjerry05]

Do a compression and spark test.

 

[Hunthard65]

Compression is 150on all four cyl spark is good on all 4 cleaned carbs and set floats replaced all reeds new fuel pump diaphragm set timing static and played with several props idles and starts great revs good on flush but not under load

 

[jerryjerry05]

Did it ever run?
New prop anything done in the last weeks?
When you "static timed" how far out was it?

Revving up no load. That's normal.

Do the cylinder drop test.
Start it and pull one plug at a time and see if it makes a difference.
Replace and move to the next cyl.

Unhook the tach and see if that makes a difference?

1. DVA check stator voltage to each pack at high speed. If it exceeds 400 volts, replace the pack.
2. Disconnect the rectifier. If the engine fires, replace the rectifier.
3. Disconnect kill wire AT THE PACK.
4. Check for broken or bare wires on the unit, stator and trigger.
5. Measure DVA voltage of the stator between the output wire sets. With everything connected, reading s should be approximately 180 volts or more. Resistance readings between the stator wire sets range from 680 - 800 ohms.
6. Disconnect the rectifier. If the engine fires, replace the rectifier.