1980 340 excell runs on ones side after 15min

ShoeMan

New member
Joined
Nov 20, 2004
Messages
14
Age
75
Location
Ohio
NEED HELP WE HAVE A 1980 YAMAHA EXCELL THAT STARTS RIGHT UP AND WILL RUN STRONG FOR THE FIRST 15 MIN. OR SO THAN IT WILL RUN ONLY ON ONE CYLINDER. PUT A NEW COIL ON IT DID NOT CHANGE. WHEN IT COOLS DOWN IT WILL RUN FINE AGAIN.

THANKS FOR THE HELP IN AVANCE
SHOEMAN

LET IT SNOW :o| :o|
 

Magneto maybe or something down down there not generating enogh power to do 2 spark plugs?

Had and old 79 enticer 250 did the same thing (only its a single) once warmed up it would quit. Change the plug to a cold one and away you go. Changed the stator I think(can't exactly remember so I will ask Maim) and it runs like a champ now.
 
Thanks What kind of Wattage should i have out of the magneto?


I think the trouble is electrical not sure how to check it out
Please Help
 
i should be able to tell you within the week, i will test my 78 exticer 340 should be close.

kirk swim
 


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