SP1 won't start - Honda RC51 Forum : RC51 Motorcycle Forums
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 26 (permalink) Old 07-09-2013, 04:57 PM Thread Starter
Lifetime Premium
 
BritRC's Avatar
 
Join Date: Jul 2013
Location: Cornwall UK
Posts: 344
Mentioned: 1 Post(s)
Quoted: 14 Post(s)
SP1 won't start

Hi Folks,

Just getting to the end of a long rebuild on my SP1 and finally ready to flash it up but it won't start. It turns over and tries but it won't run at all.

It has a new fully charged battery, good spark, and the fuel pump is running. The bike has been off the road for 5 years, but was running before it was pulled apart.

I have checked everything I can check, and there is no FI light or fault codes.

The bike cranks over and tries to fire but won't.

I had a spare FPR so swapped that out; no difference.

The only thing I can't check is the ECU.

Any help/suggestions gratefully received.

Thanks,


Guy
BritRC is offline  
Sponsored Links
Advertisement
 
post #2 of 26 (permalink) Old 07-09-2013, 05:22 PM
Senior Member
 
screamin chief's Avatar
 
Join Date: Apr 2010
Posts: 1,195
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
You have spark and you can hear the fuel pump priming. Does it just turn over or does it stumble a bit? Can you smell fuel?

Sent from Motorcycle.com Free App

2000 RC51
1985 ATC 350X
2009 Silverado SS clone
Lots and lots of guns!lol
screamin chief is offline  
post #3 of 26 (permalink) Old 07-09-2013, 05:33 PM Thread Starter
Lifetime Premium
 
BritRC's Avatar
 
Join Date: Jul 2013
Location: Cornwall UK
Posts: 344
Mentioned: 1 Post(s)
Quoted: 14 Post(s)
Turns over fine, and fires occasionally but only briefly. Plenty of fuel to the injectors.

Thanks
BritRC is offline  
 
post #4 of 26 (permalink) Old 07-09-2013, 08:47 PM
Lifetime Premium
 
madbuyer's Avatar
 
Join Date: Sep 2010
Location: Indy
Posts: 8,335
Mentioned: 17 Post(s)
Quoted: 226 Post(s)
maybe this thread will help?

https://www.rc51forums.com/forums/sho...t=cdi+box+test



The very first schoolbook that was written had God all over it. --Dave Mustaine
madbuyer is offline  
post #5 of 26 (permalink) Old 07-10-2013, 03:28 PM Thread Starter
Lifetime Premium
 
BritRC's Avatar
 
Join Date: Jul 2013
Location: Cornwall UK
Posts: 344
Mentioned: 1 Post(s)
Quoted: 14 Post(s)
Quote:
Originally Posted by madbuyer View Post
Good call but unfortunately doesn't apply to mine as I have a really nice strong spark at both plugs.

I am really hoping a local RC owner will let me try my ECU on their bike, to confirm it is/isn't good before I go deeper.

My gut feeling is an issue with the throttle bodies I replaced as everything else on the bike is as it was when it was stripped. All things being equal, if all other components were known good prior to the strip, and the only part not original is the throttle bodies/injectors/tps etc then although the FI light would suggest nothing wrong, they are the only parts untested.

I am planning to replace the injectors/tps etc with the original ones this weekend, which effectively puts the bike back to how it was prior to the strip down.

It's so frustrating to be this close to getting back on after all this time and not being able to start it!


Thanks for all the suggestions, pleas keep them coming,


Guy
BritRC is offline  
post #6 of 26 (permalink) Old 07-10-2013, 03:35 PM
Lifetime Premium
 
madbuyer's Avatar
 
Join Date: Sep 2010
Location: Indy
Posts: 8,335
Mentioned: 17 Post(s)
Quoted: 226 Post(s)
Did you swap SP1 throttle body assemblies for SP2 by chance?



The very first schoolbook that was written had God all over it. --Dave Mustaine
madbuyer is offline  
post #7 of 26 (permalink) Old 07-10-2013, 04:29 PM Thread Starter
Lifetime Premium
 
BritRC's Avatar
 
Join Date: Jul 2013
Location: Cornwall UK
Posts: 344
Mentioned: 1 Post(s)
Quoted: 14 Post(s)
They came off Ebay and were listed as SP1, but to be honest I didn't compare them to the originals and they went straight on without issue, would SP2 throttles/injectors stop it starting? I figured even if they were SP2 it would start just run badly? Could this be the issue?

Thanks.
BritRC is offline  
post #8 of 26 (permalink) Old 07-10-2013, 05:16 PM
Senior Member
 
Join Date: Oct 2008
Posts: 382
Mentioned: 1 Post(s)
Quoted: 9 Post(s)
If you spray starting fluid into the intake, will it fire right up? You pulling out the choke? Kink in the fuel line?
MikeinCtown is offline  
post #9 of 26 (permalink) Old 07-11-2013, 01:50 AM Thread Starter
Lifetime Premium
 
BritRC's Avatar
 
Join Date: Jul 2013
Location: Cornwall UK
Posts: 344
Mentioned: 1 Post(s)
Quoted: 14 Post(s)
Not sprayed starting fluid in (don't like the stuff), yes I am pulling the choke and no kinks in the fuel line.

There is definitely fuel coming through the injectors as it does try to fire, It has to be a fuelling issue, but the question is what is causing it.
BritRC is offline  
post #10 of 26 (permalink) Old 07-11-2013, 07:27 AM
Senior Member
 
Join Date: Oct 2008
Posts: 382
Mentioned: 1 Post(s)
Quoted: 9 Post(s)
Well you may not like the stuff, but you would know in an instant if it was a fuel issue, or something else like the module or even fuel pressure. nobody says you have to run the bike on it. you just need to see if it will start and run for 15 seconds.
MikeinCtown is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda RC51 Forum : RC51 Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome