Originally Posted by Tom1340
has run like a charm until this week. It is clean as a new whistle and starts on first pull every time. I don't think its ever had ethanol in it. BUT that's history
. The jets are clean and the motor
won't reach speed. It will cost me a week and about $300 to find out if the problem is the CDI
unit. I think it's time for a new motor.
Vasco, getting a new 2 cycle Yamaha in Bahamas
is very appealing. But I hate to get there to find out none is available. Do you know who sells them? If so, I will check availability before heading over.
Thanks to all who've offered comments.
A simple way of troubleshooting your issues here is to first take the dinghy
out for a run and give it a shot of starting fluid while running with it wide open. If it takes off then you can look into the fuel
system, though things like poor spark or low compression
can also be compensated for with starting fluid. Also, just give it brief squirts and not a steady stream for very long. If you have or can borrow a timing light, clip it on the leads and just look at the quality of the light flash, if the CDI
is failing you'll get a very erratic flash and not a consistent, even strobe effect. Stick a piece of tape or make a mark on the flywheel if you want, it is a little more precise to watch the timing mark jump around but to be honest, when ignition components start failing it is usually visually obvious by looking at the rhythm of the flashes.
Next couple of items to inspect before you spend money
: Your fuel tank
and line, Disconnect the line at the carb and make sure the fuel
runs through unobstructed. If an external tank, usually you can hold the end fitting open with a small screwdriver and give the squeeze bulb a couple squeezes and collect the fuel in a container, look for water
Next on the list is to do a compression
test, poor running and sooting can be caused by low compression.
Finally, after you've done all of that I'd suggest purchasing
a new set of plugs and seeing what effect that has. It could simply be that carbon fouling has ruined your plugs even with cleaning
, but it is not that common which is I don't suggest immediately running out and buying
new plugs before you make the other tests first.