I think it may be flooding? CBR954 - Honda Motorcycles - FireBlades.org
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post #1 of 19 Old 06-06-2016, 6:50 PM Thread Starter
 
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I think it may be flooding? CBR954

Hi guys,
I have a fairly old 954 that has done over 100,000 k's (odo stopped at 99999). The HTEV stopped working so I have taken out the htev motor and modded to remove the check engine light and fixed the exhaust unit in the fully open position, also I have screwed the flapper in a fully open position.
I have a PC3 usb and am running a two brothers full system (without HTEV) map.
Most of my riding is commuting in thick traffic every day - not really thrashing it.

My problem is - if I stop halfway home, approx 20min riding, the bike wont start (it turns over until the battery goes flat) unless I leave it for about 30 min or more.

I "think" it may be fouling the plugs - excessive fuel? and it takes 30 min to dry out?

I have changed the plugs twice in the last year thinking it was the plugs failing.

any ideas?
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post #2 of 19 Old 06-06-2016, 8:07 PM
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Re: I think it may be flooding? CBR954

have you checked for MIL codes as per the Service Manual...? it surely could be the FPR (fuel pressure regulator)

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post #3 of 19 Old 06-06-2016, 9:02 PM Thread Starter
 
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Re: I think it may be flooding? CBR954

Thanks for your response

If there is a MIL code wouldn't the lamp light up on the cluster?
I get no FI light or anything indicating a fault.

I have checked the vacuum line on the FPR for leaks but found nothing. Can the FPR jam open to a higher fuel pressure without leaking out the vacuum line?
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post #4 of 19 Old 06-07-2016, 5:40 AM
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Re: I think it may be flooding? CBR954

I can't say for certain on either account... but it's worth checking (code) anyway.

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post #5 of 19 Old 06-07-2016, 8:41 AM
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Re: I think it may be flooding? CBR954

pull the codes if any and the next time you change the plugs post some pic.'s. as many pieces to the puzzle you can give us the more helpful we may be.

fall down 7 times, get up 8
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post #6 of 19 Old 06-07-2016, 10:43 AM
 
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Re: I think it may be flooding? CBR954

100k miles on an engine, starting to foul plugs, anyone mention to check compression?

Signed,
NOLTT (no one likes tail tucking)
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post #7 of 19 Old 06-07-2016, 1:20 PM
 
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Re: I think it may be flooding? CBR954

Them people over there use that new fangled metric system that only a few countries use. It's only 60,000+ miles, but I see where you're going.

"You live more for 5 minutes going fast on a bike than other people do in all their life"-Marco Simoncelli
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post #8 of 19 Old 06-07-2016, 7:16 PM
 
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Re: I think it may be flooding? CBR954

Forget about codes for now. If none are present during initial start up and self check don't worry about it for a minute.

What are you trying with the throttle and choke when it fails to start?
Are you using iridium plugs?
What is your normal idle speed when at operating temp?
Did you cycle the fuel pump while you had the vac line off the fpr?
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post #9 of 19 Old 06-07-2016, 9:20 PM Thread Starter
 
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Re: I think it may be flooding? CBR954

Quote:
Originally Posted by jondog9 View Post
Forget about codes for now. If none are present during initial start up and self check don't worry about it for a minute.

What are you trying with the throttle and choke when it fails to start?
Are you using iridium plugs?
What is your normal idle speed when at operating temp?
Did you cycle the fuel pump while you had the vac line off the fpr?
1, When I try to start I leave the throttle alone and unless im mistaken there is no choke.
2,Yes i am using the standard ngk iridium plugs.
3, from memory (I will check on Saturday) the idle is bout 800rpm when hot.
4, and i turned on the key and heard the pump when i had the vacuum line off.

Thanks for your help
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post #10 of 19 Old 06-07-2016, 9:34 PM
 
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Re: I think it may be flooding? CBR954

I had the exact same issue that started around 25- 30K miles, it started fine while cold but i would have to do a rolling bump start every time i shut it off for a gas fill up or something else and it would literally just crank over until the batttery died. Anyway, it still had the original stock battery so i replaced it with a shorai and it hasnt had any problems since. The issue may be something else like the regulator, running rich/fouled, etc, but it appears the new battery is providing enough juice to overcome whatever was preventing it from firing up.

03' Blk/Tit CBR 954rr, Erion full system, PCIIIr, Scott's Damper, Vortex Frame Sliders, Galfer SS Lines, Rear Seat Cowl, flapper pinned.
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post #11 of 19 Old 06-07-2016, 11:21 PM Thread Starter
 
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Re: I think it may be flooding? CBR954

Quote:
Originally Posted by vertical954rr View Post
I had the exact same issue that started around 25- 30K miles, it started fine while cold but i would have to do a rolling bump start every time i shut it off for a gas fill up or something else and it would literally just crank over until the batttery died. Anyway, it still had the original stock battery so i replaced it with a shorai and it hasnt had any problems since. The issue may be something else like the regulator, running rich/fouled, etc, but it appears the new battery is providing enough juice to overcome whatever was preventing it from firing up.
Thanks.
I don't know how old the battery is, I will give it a load test when I get home (am away until Saturday).
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post #12 of 19 Old 06-08-2016, 1:33 AM
 
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Re: I think it may be flooding? CBR954

Quote:
Originally Posted by jondog9 View Post
Forget about codes for now. If none are present during initial start up and self check don't worry about it for a minute.

What are you trying with the throttle and choke when it fails to start?
Are you using iridium plugs?
What is your normal idle speed when at operating temp?
Did you cycle the fuel pump while you had the vac line off the fpr?
Quote:
Originally Posted by addict View Post
1, When I try to start I leave the throttle alone and unless im mistaken there is no choke.
2,Yes i am using the standard ngk iridium plugs.
3, from memory (I will check on Saturday) the idle is bout 800rpm when hot.
4, and i turned on the key and heard the pump when i had the vacuum line off.

Thanks for your help
I see at least part of a problem. Your idle speed should be ~1200rpm when warm.
Since the engine is still warm when try to restart, having the idle set that low could be a problem, but doesn't explain wet plugs really.
No choke on the 954's? I guess they use the wax ring thing.
If you're not having any other drivability issues, (like stalling, runs rough at low rpms, smells like gas), and you tested the fpr, I think we can rule that out.

All I can figure is it's missing enough spark to ignite the fuel under those certain conditions.
Coils? I don't know really, ignition isn't my strong suit.
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post #13 of 19 Old 06-11-2016, 1:29 AM Thread Starter
 
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Re: I think it may be flooding? CBR954

Ok.
I started the bike after sitting for a week, it started well. I warmed it up to 100 degrees - idle was 1200 rpm, stopped it. Tried to start again, seemed a little weak but started, turned off and tried gain - wouldn't start.
Left it for about 20 minutes, tried starting - wouldn't start.
Waited another 20 min and tried again - turned over a few times and started then backfired like a shotgun!! very loud.

I took a video but didn't manage to get the backfire.
about 4 minutes - sorry if its a bit tedious.
gets interesting at about 2:45
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post #14 of 19 Old 06-11-2016, 2:22 AM
 
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Re: I think it may be flooding? CBR954

Throttle sync = Usually starts faster.
Throttle angle = I'd just crack the throttle open when starting... looking for some idiosyncrasies to it.
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post #15 of 19 Old 06-11-2016, 11:33 AM
 
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Re: I think it may be flooding? CBR954

Quote:
Originally Posted by Catch22 View Post
Throttle sync = Usually starts faster.
Throttle angle = I'd just crack the throttle open when starting... looking for some idiosyncrasies to it.
Glad you mentioned that. I was thinking the same thing about cracking the throttle open a tad. That's why I asked what he's doing with the throttle and choke. I hesitated to recommend, cause I didn't really know, but it's worked for me in the past when I had fpr issues.
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