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Could use some help troubleshooting this ignition issue. Any Suggestions”?
Yamaha XS1100 1978 original owner 71000 km low yearly usage
Issue- not firing even when added with ether
History – replaced regulator 3 years back
Since then has fired up on first crank even with over-winter gas in tank
Only ridden about 150 miles this year
Recent has been harder to start- need to crank for 30-60+seconds
Keep voltage up with external battery charger for good cranking
This week, would not fire at all even when using ether- very unusual
Related observation- had gas in breather when I removed it-
Have not been able to identify from which carb the gas was flowing back into breather from
Suspect this is a separate issue.
Other issue was it has been recently hard to idle- had to keep rev’s up but if it stalled it restarted ok
Does this indicate low spark energy at low rpm?
Pulled plugs and checked for spark from plug to block when cranking
Plugs seem to have reasonable spark.
Do have concerns about the age of the high voltage plug wires- but since they are firing seems ok.
So what can cause a motor that was starting and running ok to not fire at all.
a) Presence of spark seems to indicate the ignition system is functioning.
Plan B is to replace the two ignition modules but expensive for an old bike.
Is there a recommended after-market ignition module for xs1100? (suggested supplier)
b) Presence of spark seems to indicate the wiring to ignition system is ok – will check all connections further
c) Change spark plugs
To do:
a) More spark plug wiring checks and comparison across the 4 cylinders
b) Double check all connections
c) Check ballast resistor
d) Check throttle engine stop switch
e) Check tip-over switch
f) What else
Yamaha XS1100 1978 original owner 71000 km low yearly usage
Issue- not firing even when added with ether
History – replaced regulator 3 years back
Since then has fired up on first crank even with over-winter gas in tank
Only ridden about 150 miles this year
Recent has been harder to start- need to crank for 30-60+seconds
Keep voltage up with external battery charger for good cranking
This week, would not fire at all even when using ether- very unusual
Related observation- had gas in breather when I removed it-
Have not been able to identify from which carb the gas was flowing back into breather from
Suspect this is a separate issue.
Other issue was it has been recently hard to idle- had to keep rev’s up but if it stalled it restarted ok
Does this indicate low spark energy at low rpm?
Pulled plugs and checked for spark from plug to block when cranking
Plugs seem to have reasonable spark.
Do have concerns about the age of the high voltage plug wires- but since they are firing seems ok.
So what can cause a motor that was starting and running ok to not fire at all.
a) Presence of spark seems to indicate the ignition system is functioning.
Plan B is to replace the two ignition modules but expensive for an old bike.
Is there a recommended after-market ignition module for xs1100? (suggested supplier)
b) Presence of spark seems to indicate the wiring to ignition system is ok – will check all connections further
c) Change spark plugs
To do:
a) More spark plug wiring checks and comparison across the 4 cylinders
b) Double check all connections
c) Check ballast resistor
d) Check throttle engine stop switch
e) Check tip-over switch
f) What else
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