Cold won't start then sits and starts ? - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 10 (permalink) Old 10-17-2014, 08:01 AM Thread Starter
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Cold won't start then sits and starts ?

Greetings,

Always good advice from this forum. In the past.

Current question:

Bike sat for 6 weeks and on a tender. Just completed a 4000 mile ride in Aug.
Bumped the starter last night. It started and it lit it run for 2 secs. In a garage and late. Tried this am and it won't start.

This happened in the past. Normally let it sit for a few hours and it starts.
Happened twice since 2000.

Disconnected batt just a long shot to reset the cpu ?

Bike is 100% Stock 2000 RC51. It has 60k miles and always bulletproof.
Just took it on a 4000 mile trip.

Anyone can shed some light.

Thanks
Cyril
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post #2 of 10 (permalink) Old 10-17-2014, 01:54 PM
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When you try to start it, does turn over slowly or not at all?
What is the current charge level before attempting to start the engine?

A good battery charge level should be 13-13.5V, low battery is 12-12.5V, dead battery less than 12V.

If the battery maintains a good charge level overnight while not on the charger, and still fails to start the engine, it may be a failing starter relay.
This what happened to me a few months ago on my FZ1.

Also check that your battery cables are not loose or corroded, which will reduce battery charging or starting current.

Had a hot battery, but with sporadic to no starter activity. Replaced the starter relay and works fine now.

Since bikes are exposed to environmental effects of rain and humidity more than cars, they tend to develop electrical problems due to contact corrosion over time.

I hardily recommend buying a tube of dielectric grease and applying a dab to any and all electrical contacts.
By doing this, you greatly reduce or eliminate most electrical gremlins.

Last edited by SubSailor; 10-17-2014 at 05:06 PM.
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post #3 of 10 (permalink) Old 10-17-2014, 04:31 PM Thread Starter
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Thanks for the reply . Strange it started after sitting for a few hours. Batt is 2 years old.

Tks
Cyril
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post #4 of 10 (permalink) Old 10-17-2014, 08:36 PM
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That's what failing relays do. Hit and miss.
I've been through all of my relays by 30,000 miles.
I keep a spare in my tool kit as the headlight, fuel pump, and bank angle relays are all the same.

However, the starter relay is different. Since it's located on the left outside of the subframe, (remove the tailsection to access it) there's not a lot of ventilation and the relay and reg/rec can get pretty hot in there.

Even if it turns out to be your battery, at your mileage, it may be a good idea to inspect the reg/rec's connectors, condition of the wiring, the DC voltage that the reg/rec is putting to the battery and the AC voltage coming from the stator.

John, 2000 RC51 #000100

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post #5 of 10 (permalink) Old 10-17-2014, 08:51 PM Thread Starter
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Good point about the relays.

Thanks

Will put a few hundred miles on it this weekend.
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post #6 of 10 (permalink) Old 10-18-2014, 09:09 PM
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Anyone know the part numbers for the relays off hand? Want to pick up a spare for the starter and one spare of the other ones. Is there any non honda options? Relays are normally pretty simple and only cost a couple bucks. I'm sure honda is proud of theirs
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post #7 of 10 (permalink) Old 10-19-2014, 08:28 PM
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RELAY, STARTER (MITSUBA) (Qty, 4)
38501-GN2-014

RELAY, TURN SIGNAL (DENSO) (Qty, 1)
38301-MBW-D21
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post #8 of 10 (permalink) Old 10-20-2014, 10:21 AM
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I went with some Bosch relays for my van about two years ago. In that time the srarter relay failed. But I went back to ORiely's and they gave me a new one- they said Bosch has a lifetime warranty on their relays.

But for my bike I only use the Honda relays. I trust the Japanese craftsmanship much more than the Chinese Bosch's.

John, 2000 RC51 #000100

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post #9 of 10 (permalink) Old 10-20-2014, 01:57 PM
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Unfortunately, even the Japanese out-source to China for various stuff. Sad, but true.
Hopefully, Chinese "quality" won't corrupt Japanese parts too badly.
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post #10 of 10 (permalink) Old 10-20-2014, 03:06 PM
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^ Didn't know that, but not surprised. To me that's a damn sorry state of industry. I'm getting tired of throw-away and manufactured obsolescence and just pisspoor quality control.

John, 2000 RC51 #000100

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