89 XT600 3EW spark issues / backfiring
Hi,
I can't see if the spark is erratic or just fast. The picture needs to be steady for my tired old eyes
Don't know the code 3EW. '89 should be kick-start, but some early E bikes had both, and maybe CDIs. Why? determines speed constancy of kick start / electric start.
The CDI provides a spark on each revolution of the crank. It does look too fast. Maybe you can take a high speed video and then play it slowly :-)
I can't think of any reason how the CDI / trigger can generate an irregular spark. Also doubt the engine could run in any satisfactory way without a timed spark.
My '87 XT will pull well if i forget to open the fuel tap, until it dies, but will backfire on overrun very soon if fuel is low in carb. Lean mixture also a cause of running hot.
If i can't figure out the problem i treat the symptoms and see what happens. Try a richer mixture - raise the carb needle.
Be well'
p
Last edited by pete j; 20 Aug 2021 at 10:28.
Reason: grammar
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