fuel problems - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 17 (permalink) Old 04-17-2016, 10:50 AM Thread Starter
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fuel problems

Hi
I have had my SP1 parked up for a few years and although it was run out of petrol before being parked I cannot get it to start now. Is there an easy way to clean out the fuel system on these bikes as I am assuming that is the problem.
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post #2 of 17 (permalink) Old 04-17-2016, 11:56 PM
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Hi
I have had my SP1 parked up for a few years and although it was run out of petrol before being parked I cannot get it to start now. Is there an easy way to clean out the fuel system on these bikes as I am assuming that is the problem.
You gotta give a little more than that.
Does it fire?
Does the fuel pump prime?
Did anyone try to fire it with the old fuel still in it?
A likely reason it wont start, is part or all of your fuel system is gummed up.
Another big mistake is trying to start on an old battery that's been inactive for that long, then recharged. It may show the proper voltage on a meter, at least 12.75 or better, until you thumb the start button. If voltage drops below 11 or so, ECU wont function.

Sitting that long, with the ethanol in the gas these days, no doubt your injectors and fpr need attention. I would suspect the fuel filter too. Hopefully the fuel pump isn't gummed up.
Rust in the gas tank is a possibility.
And the SP1's were prone to a faulty weld that causes rust and leaking. At the rear tank bracket. Look for discoloration in the red paint at the hinge.

All that said, the easy way is to purge all the old fuel from the system, get fresh fuel, and a bottle of Seafoam. I haven't ever used it, but it gets good remarks on the forums.
Sometimes...
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post #3 of 17 (permalink) Old 04-18-2016, 08:44 AM
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What does the inside of the tank look like? Pics?

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post #4 of 17 (permalink) Old 04-18-2016, 11:15 AM Thread Starter
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Starting problems

Hi, in answer to your questions, no it does not attempt to fire at all although dropping a little petrol down the carb bodies and it does attempt to fire. The bike was let run dry when parked up but I guess it will never totally clear the system. It was turned over now and again when parked up so have taken in any dead fuel. The fuel pump is priming and has been flushed out with fresh petrol. I have not went any deeper as it looks quite a complicated stripping job to get into the fuel system and I have not been able to find any advise on removing the air box etc to investigate further. Any help would be greatly appreciated.
Many thanks
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post #5 of 17 (permalink) Old 04-18-2016, 11:16 AM Thread Starter
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The inside of the tank seems spotless.
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post #6 of 17 (permalink) Old 04-18-2016, 11:33 AM
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Service manual.

https://www.rc51.info/index.php?page=service

Removing the airbox is pretty straightforward, but a few steps to follow. That will allow you to get to the injectors if needed.
Sounds like you have fire, so that should mean that the battery is ok.
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post #7 of 17 (permalink) Old 04-18-2016, 02:17 PM Thread Starter
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Thanks John, that's really helpful, would you recommend cleaning the injectors with carb cleaner.
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post #8 of 17 (permalink) Old 04-18-2016, 09:19 PM
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does it have a power commander?
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post #9 of 17 (permalink) Old 04-19-2016, 01:58 AM
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Just to get it started? I don't know, but I doubt it. Carb cleaner is really corrosive to some materials. especially any gaskets or rubber seals.
If the injectors are clogged, take them out and have a shop ultrasonic clean them.
I've never been that far into my fuel system personally. But after doing a complete rebuild on my gl1000 carbs, I learned how risky carb cleaner can be.
Hopefully some members more experienced will chime in, but the service manual is also a wealth of information.

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does it have a power commander?
Ah, good point.
If so, bypass it temporarily, and continue troubleshooting.

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post #10 of 17 (permalink) Old 04-19-2016, 03:07 PM Thread Starter
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Hi
Once again thanks for the info, i have been into the injectors/fuel lines etc and they all seem pretty clean but still no success.
In answer to your other question yes it does have a power commander (came fitted to the bike when I purchased it). I know nothing about them or what it entails bypassing them, will have a look at it tomorrow as I don't know what else to try now.
Cheers
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