150 V-Max 1998 model

[Graeme Sturzaker]

My 150 V MAX has developed a miss at idle and low throttle. I have been through the carbi, swapped coils and plugs, but the miss remains on number 1 cylinder. Any idea's?

[99yam40]

need to find out if it is loosing spark to plug or if it is fuel related.
an inductive timing light should show that

[TownsendsFJR1300]

As stated above, pull the spark plug, ground it to the head and crank it over checking for spark. I suspect if you've changed it all over already, the spark will be fine.

I would next check compression in that cylinder and compare it to the rest. It should be within 10% of the others.

If compression is within limits, I would look closely at your carb again for crud build up in the idle/main jets as well as any vacuum line leaks.



How do you know #1 cylinder is not working and is the problem?

[Sparkieboat]

the how do you know its the #1 cylinder is a good question.

[jb123]

check lift pumps, could be getting plugs wet, simulating no spark if you only pulled wires
ohm test plug caps