Author Topic: Cb550 wont start (Read 586 times)

Lochlea21 · « **on:** December 02, 2015, 12:50:24 PM »

Hi guys a wee problem thats doing my nut in,Ive a 550 four that was running fine ,but now wont start .it seems to spark ok and the plugs are wet .its got electronic ignition amd strted first start of the button ,had a few backfires but thats all

Gene · « **Reply #1 on:** December 02, 2015, 12:54:37 PM »

You've checked for spark? Make sure the plugs aren't fouled, and - not being a jerk - you have fuel?

Lochlea21 · « **Reply #2 on:** December 02, 2015, 01:02:31 PM »

Yea just put fresh fuel in ,battery started to go flat but still wouldnt start from the kick,

Gene · « **Reply #3 on:** December 02, 2015, 01:14:08 PM »

If it had points I'd say it's maybe the points. I'm not familiar w/the electronic ignition - from what little I can tell sounds like a timing issue.

Smarter people than me will be along - what year is the bike?

goldarrow · « **Reply #4 on:** December 02, 2015, 01:21:39 PM »

You mentioned the plugs are wet, I would start off with that. Get new plugs

Lochlea21 · « **Reply #5 on:** December 02, 2015, 01:25:41 PM »

Do i need a fully charged battery to give a decent spark

flybox1 · « **Reply #6 on:** December 02, 2015, 01:33:20 PM »

no, but one certainly does help.

mrbreeze · « **Reply #7 on:** December 02, 2015, 01:41:06 PM »

Sounds like you flooded it and fouled the plugs. Did you initially try to start it without the choke on? Clean or replace plugs and try again with choke on.

Lochlea21 · « **Reply #8 on:** December 02, 2015, 01:42:29 PM »

when I take a plug out ,stick it in cap and turn it over against the head the spark is weak ,but when i hold it against the exhaust seems to be better?

Lochlea21 · « **Reply #9 on:** December 02, 2015, 01:43:02 PM »

Do they foul plugs easily

Gene · « **Reply #10 on:** December 02, 2015, 01:45:00 PM »

Quote from: Lochlea21 on December 02, 2015, 01:43:02 PM

Do they foul plugs easily

Depends on the set-up and situation. Generally, no.

mrbreeze · « **Reply #11 on:** December 02, 2015, 01:50:26 PM »

You say the spark looks weak. Try it with a new plug. If it still looks weak you have other problems (state of charge, points, etc.). Also.....if it still looks weak....swap over to a plug wire from the other coil and do your spark test. 1-4 are on one coil......2-3 on the other.

Lochlea21 · « **Reply #12 on:** December 02, 2015, 02:04:33 PM »

You sure that 1&4 is on one coils and 3&4 on the other cause ive seen wiring diagram where 1&2 r on one coil and 3&4 on the other ?

Gene · « **Reply #13 on:** December 02, 2015, 02:20:08 PM »

Quote from: Lochlea21 on December 02, 2015, 02:04:33 PM

You sure that 1&4 is on one coils and 3&4 on the other cause ive seen wiring diagram where 1&2 r on one coil and 3&4 on the other ?

Mr. Breeze is correct.

Lochlea21 · « **Reply #14 on:** December 02, 2015, 02:24:21 PM »

Could be the problem as i seem to to have 1&2 of one coil and 3&4 of the other ,dont know how that happened .So if your sitting on the bike what plugs do the left hand coils feed and what ones for the right ?

Lochlea21 · « **Reply #15 on:** December 02, 2015, 02:25:08 PM »

I presume this will stop it starting lol

flybox1 · « **Reply #16 on:** December 02, 2015, 02:36:52 PM »

the coil with the short wires feeds 2/3
the coil with the longer wires feeds 1/4

Gene · « **Reply #17 on:** December 02, 2015, 03:14:29 PM »

On my hopelessly stock 550 - Left is 2-3, Right is 1-4

mrbreeze · « **Reply #18 on:** December 02, 2015, 03:21:52 PM »

I think we may have found the problem. I don't think the 2-3 wires are long enough to reach the outer cylinders (1-4) though.. But then again....the bike isn't in front of me.

jonda500 · « **Reply #19 on:** December 03, 2015, 05:26:46 AM »

On all three of my 500/550's left is 2&3, right is 1&4.
John

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Author Topic: Cb550 wont start (Read 586 times)