problems starting when bike is warmed up. - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 7 (permalink) Old 04-23-2013, 06:55 AM Thread Starter
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problems starting when bike is warmed up.

When I first stat the bike in morning, it starts up fine. After a bit of riding, and the temp gets up to 190 or more, the bike won't start---unless I lean the bike to the left.... yes you read that right. I have to lean the bike to the left for it to start when it is warmed up.

Everyone I talk to has never heard of this.

It is a 2000 SP1, with 57,000 miles on it.

thanks in advance for any help.
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post #2 of 7 (permalink) Old 04-23-2013, 09:02 AM
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Once it starts, does it ever cut out riding?
Especially if leaned to the right?

You could try checking the Bank Angle Sensor (BAS) via the service manual.
It's a fluid damped pendulum with a set of switches, and sometimes they start sticking.
Not common, but has happened in the past.

Once running, does the engine smell rich? If so, you can also check the Fuel Pressure Regulator (FPR) which does go out occasionally.
Raised and prop the fuel tank, then switch the key on and allow the fuel system to pressurize, but don't start the engine. Then switch off.
The FPR is mounted on the throttle body. Pull the small hose off the diaphragm housing and check if fuel leaks out. If it does, replace the FPR.

Service manual here:
http://www.rc51.info/index.php?page=service
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post #3 of 7 (permalink) Old 04-23-2013, 09:17 AM Thread Starter
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it doesn't cut off when riding or leaning. It doesn't smell rich either, I had the fuel pressure sensor replaced 3 years ago. The BAS sounds like a good place to start. It's just weird because it only does it when the bike is warmed up.

thanks!
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post #4 of 7 (permalink) Old 04-23-2013, 01:26 PM
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The BAS is the only device on the bike that is angle sensitive.
In the service manual, it's on P.5-55.

In essence, remove the BAS and place it in it's normal vertical orientation.
Then switch the key to on and then slowly tilt the BAS to one side.
At about 60 deg. you should here the BAS relay click, disabling the fuel pump.

Switch the key off, return the BAS back to vertical, switch the key back on, and then slowly tilt in the other direction with the same result.

If it doesn't operate properly, then the BAS may be bad internally.
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post #5 of 7 (permalink) Old 04-23-2013, 01:32 PM Thread Starter
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Thanks! I'll check it out, and let you know what happens. After reading that section. It sounds like the BAS is bad, or loose and leaning on its own.
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post #6 of 7 (permalink) Old 06-10-2014, 02:30 PM Thread Starter
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well, after a little over a year of dealing with this issue, i finally fixed it!!!

I removed the neutral switch on the left side of the crank case, and cleaned it a little, put it back in, and that was it!
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post #7 of 7 (permalink) Old 06-10-2014, 09:40 PM
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Awesome! Thanks for coming back and giving this thread, (ah, coughcoughcliche), closure.

John, 2000 RC51 #000100

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