Logo
FULL SITE MENU

Yamaha 140 V4

T

TTURTO

New member
Hi all,
recently bought a 140 v4(early blue), not sure of a year? Not charging battery & runs slow(38 mph on 19ft Crusader speedboat), but starts great. Also runs a little hotter on right bank. Think it's the stator, how do i check please? can't find anyone in the UK to rewind it?🙄🙏
 
Within the stator there are several components. The one that produces electricity to charge a battery is known as the lighting coil. There should be two green wires from the lighting coil that provide electricity to the rectifier/regulator. The R/R provides electricity to the battery.

Test the output from the R/R for DC voltage. But first to check to see if there is a fuse in the loop and that the fuse is in good working order. I would expect you to see 13.5 volts or so from the R/R. With the motor at a fast idle.

If the voltage from the R/R is low then test the lighting coil outputs to the R/R. The peak AC voltage from the lighting coil with the motor running at 1500 RPM should be above 35 volts.
 
Back
Top