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after timing my excel via post below from cousinabe my timing light shows -5 degrees at idle and +15 degrees at around 3800 RPM
is this normal??
(original post)
how do i tune my motors spark
this motor doesn't have a distributor all its firing times are done through a computer.
on the...
when the engine starts warming up after 1 or 2 hours running hard or not it starts temporarily miss firing at around 2500 RPM.
you can hear and see the motor drop and raise RPM slightly
(between 2000 and 2500 rpm for around 1/10 of a second continuously)
when throttle is given passed 2500RPM...
My Yamaha excel 1986 225hp v6 runs fine with awesome power for the first hour or two depending on water conditions then it starts losing power gradually for the next half hour until it eventually stops. the odd thing is when it does stop (with full throttle) and after the throttle is placed back...
