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Hi all, been a while. As some of you know on a previous cb1000r I had a nightmare with starting issues. Cut a long story short. Honda bought the bike back off me because they couldn't sort it out. In 2013 I purchased another cb1000r and for roughly 4 years it ran sweet till. You guessed it. Intermittent starting. Changed battery twice, even tho sensors were passing I was swapping them all out. Stripped the bike right down. 3 pulse generators, cleaned injectors. Was starting to be a money pit. Bit the bullet and had it off the road for a few months and checked each wire in the harness. Noticed that at the ecu, the 33pin plug had a Intermittent connection when wobbled that reset the iacv. Sorted that and still Intermittent spark. Got back up to the fuse box and when moving it in a certain position I would get full spark back! Surprisingly a clean white spark that would jump an inch and half.
I took each individual spade out and soldered the crimped connections, cleaning and adding dielectric grease. Still Intermittent but better. I swapped the ignition relay for another relay that I know works as you can take it apart and check the contacts and every time I'm getting full spark! Bike starts first go every time.
Took the old relay apart and where the contacts are inside it was arcing quite bad where there wasn't a 100% connection.

Hope this helps someone that has similar problems.
 

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2021 CB1000R; 2018 CBR1000RR SP
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Impressive perseverance, @Dewby. You must have some electrical work background to do all the diagnostics.
Congrats for finding the culprit and for sharing with us.

I'm curious: how did you determine if the plugs were sparking intermittently or full sparks?
 

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Thanks for the post. My 2014 has occasional starting issues when stopping for fuel. Last time I changed the battery and it was good for 2 years before returning last month. I changed the battery again and seems to be fine (for now), but will look into getting a new relay anyway. It can be embarrassing when you pull up for fuel on such a nice machine and then cant get it restarted haha.
 
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