SOHC.co.uk Forums > CB500/550
Bike won't start - help!
K2-K6:
You could try getting a positive feed direct from the battery to the coils to cut out any loom\kill switch variables and see if you get anywhere. Make sure you can break the connection to cut the motor in case of emergency.
If you've got a timing strobe that takes a pulse from ht leads, it will confirm if you are generating sparks.
Assuming if you check and set the timing you are seeing electrical switching across each contact.
Chris400F:
I was think it sounds like possibly you have a weak spark so maybe not sparking under compression.
Ruling out as many sources of a poor connection as possible sounds a good plan.
JustcallmeMrT:
Sounds like a plan - I can hook up battery to coils via an alligator clip that I can pull if all goes awry and see if it's something in the loom.
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Woodside:
Hi are they new ngk plugs.....I had a set in my blade it wouldn't fire at all..
Plugs out looked like a spark but was abit wayward not a nice solid jump across gap....I had flooded it previously. ...asked my mate who is a bike mechanic he said ngk a pretty much fubar'd after a flooding and are good for nothing....He was right new plugs it was good as gold again
deltarider:
--- Quote ---after a blissful week of riding, my bike no longer starts,
--- End quote ---
Short rides only?
--- Quote ---I have done the following:
-checked valve clearances
-checked static timing
-cleaned and gapped the points
--- End quote ---
Correct order would be:
-cleaned and gapped the points
-checked static timing
(Gapping the points will change the timing.)
--- Quote ----replaced condensers and spark plugs - spark seems ok
--- End quote ---
What does 'seems ok' mean?
BTW, after replacing condensors it's always wise to check if the connectors are not too close to the plates and as a result are touching them on and of and so making ground intermittently.
After checks, do start attempt with fresh plugs, charged battery and known good plugcaps.
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