Yamaha Moto 4 350 weak spark
Apr 5, 2018 | 09:24 PM
#1
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Weekend Warrior
Joined: Mar 2018
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Yamaha Moto 4 350 weak spark
I recently picked up a Yamaha Moto 4 350. The guy I bought it from said it was running great when parked but sat for 4 months and wouldn’t start back up. So far, I have replaced the battery, checked compression (120), and checked for spark. It has spark but it seems to me like it’s pretty weak. I’m going to clean out the tank and carb but I’m thinking the spark is going to be an issue. I sprayed some starting fluid in the carb and it didn’t fire at all.
My question is, what is are some common causes of weak spark. Especially ones that could happen when sitting for an extended period of time.
Also, can anyone tell me the ohm readings?
My question is, what is are some common causes of weak spark. Especially ones that could happen when sitting for an extended period of time.
Also, can anyone tell me the ohm readings?
Apr 6, 2018 | 02:58 AM
#2
Elite Pro Rider
Joined: Oct 2013
Posts: 7,483
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From: Lancaster England
Damp, usually ignition coil, but exciter or trigger coil too. However, some bikes with the most feeble looking sparks run fine. Never seen a Honda 200 three wheeler with a decent spark, but they still run.
Apr 7, 2018 | 10:06 AM
#5
Elite Pro Rider
Joined: Oct 2013
Posts: 7,483
Likes: 387
From: Lancaster England
The exciter coil produces the power for the spark, a trigger coil produces a pulse at the right time to spark, so my guess would be trigger and pulsar will mean the same. Suzuki LT50 is the only bike I know to use one coil for both exciter and trigger.
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