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Honda FireBlade Discussion of the Honda CBR 900RR, Honda CBR 929RR, Honda CBR 954RR, and Honda CBR 1000RR Motorcycles.

Thread: Running on three cylinders?? Reply to Thread
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  Topic Review (Newest First)
10-03-2008 10:58 PM
I_FLY_LOW
Re: Running on three cylinders??

I wouldn't think so..
I felt that way at first, when I got it running for the first time.
I went through so much hell getting the thing redone, I felt like the engine would of course be the last straw...
Since I replaced literally everything else on the bike, except the frame and engine...
The only thing left untouched, was the engine internals...
But, I (and some good help) got through the bugs, which all turned out to be minor, and everything's great now...
Keep your chin up, take your time, and walk away when you get frustrated...
Welcome to the fun part of motorcycling!
10-03-2008 5:51 PM
temperedtim929
Re: Running on three cylinders??

I'm going crazy knowing I wont have it on the road till Spring. But its nice to know I have plenty of garage time to get to know the bike inside and out, mechanically anyways, Ill take next summer to get to know it on the road.

But looking at the big picture... the bike needs maintenance but I shouldn't be worried about anything catostrophic right?
10-03-2008 4:00 PM
I_FLY_LOW
Re: Running on three cylinders??

Quote:
Originally Posted by Atomicpunk View Post
You probably have a bad fuel pressure regulator. It's a rubber diaphram that is known to crack and cause the bike to run too rich. This condition could cause fowled plugs. when you get the bike up to operating temp it might be cleaning the plug up enough to run smooth. If you remove the vacuum hose from the regulator, no fuel should come out. If you see fuel, you need to replace the fuel pressure regulator. Good luck.
+1... hit it on the head...

Mine actually ran on 2 cylinders, right after I replaced the regulator.
It had 2 plugs fouled. At this point, I hadn't touched the bike in 2 months, prior to this, and It was empty, so I nursed it around the corner, for a tank of fresh fuel and some seafoam, just for good measure.
Still on that short ride, it was still hitting on 2, so I limped it back home.
almost made it home, when cyl 3 popped back to life, so I decided to take it for a ride, to see if 4 would kick in. It never did... It turns out it was bad from the very first run right after reassembly. Fuel had fouled it and the #3 plug, but 3 was able to clear out, while 4 was ruined.
Since the regulator and plug replacement, it's never missed a lick. Starts up on the first couple of rotations, every time, and pulls strong...
10-03-2008 3:07 PM
Atomicpunk
Re: Running on three cylinders??

You probably have a bad fuel pressure regulator. It's a rubber diaphram that is known to crack and cause the bike to run too rich. This condition could cause fowled plugs. when you get the bike up to operating temp it might be cleaning the plug up enough to run smooth. If you remove the vacuum hose from the regulator, no fuel should come out. If you see fuel, you need to replace the fuel pressure regulator. Good luck.
10-03-2008 2:50 PM
temperedtim929
Re: Running on three cylinders??

oh and the cylinder that was a bit cool was cylinder 3.
10-03-2008 2:49 PM
temperedtim929
Re: Running on three cylinders??

Well after letting it run a bit longer all 4 four are piping hot.... and it really smooths out and sounds more consistant with the firing. I took it down the road (illegally) and it pulls strong... wouldnt it be falling over itself if it were on three?

I plan to pull the plugs with winter and replace, along with filter, oil and coolant.

Can a misfiring cylinder mean bigger problems?
10-03-2008 2:20 PM
I_FLY_LOW
Re: Running on three cylinders??

that's true.. Instead of stone cold, I should have stated noticeably cooler, then the others... But you did find the dead cylinder...
Which cylinder is it?
Sitting on the seat, #1 on the left, #4 all the way to the right...
10-03-2008 2:01 PM
bladeracer
Re: Running on three cylinders??

No. It's going to be warm due to heat radiated from the rest of the engine and headers.
Sounds like you have a problem there so check it for spark to confirm.
10-03-2008 1:58 PM
temperedtim929
Re: Running on three cylinders??

Alright. I just started the bike and let it run for a few minutes. I touched each header. all three are hot but three of them you cant even touch for a second without burning your finger tip while one of them(second in from the right while on bike) you can touch and leave your finger there for about 8 seconds before it starts to get uncomfortable. If it were not firing would it be absolutely stone cold?
10-03-2008 10:54 AM
I_FLY_LOW
Re: Running on three cylinders??

mine indicates 177-185f when in motion, depending on outside temperature.
Sitting idle, can creep up to 200f and up, depending on how long I sit, and relative to the outside temps, also.
I believe the fan kicks on @ 216f.
10-03-2008 3:09 AM
bladeracer
Re: Running on three cylinders??

Quote:
Originally Posted by temperedtim929 View Post
If it were running on three what are the indications? Also what is the best operating temp?... i never really get into the throttle till its at least 140ish..??
Spit on each header and if one is cold it's not firing.
You can also use a non-contact thermometer if you have one :-)
Operating temp varies across engine designs dependent on where the temp senders are located in the cooling system so you can only go off what other bikes are running normally.
I think around 80-85C is considered "normal" for the 929/954 on the OEM gauge while moving.
10-03-2008 2:01 AM
I_FLY_LOW
Re: Running on three cylinders??

I had the same problem...
Restored the bike, completely.
I took it for an initial test ride, 3 cylinders from the get go...
Turned out to be a combo problem.
Bad fuel pressure regulator, and 1 bad plug.
I had performed a complete service in the bike during the resto, including brand new plugs.
One plug went bad, possibly due to fuel fouling, with the bad regulator in the mix, on the initial first startup.
replaced those two items, and she runs like a scalded ape, now!
Turned out on mine to be the #4 plug.

On 3 cylinders, there's no doubt it's not quite right...
It's not as smooth as when all 4 are running.
Kinda like the duc explanation...
With it in neutral, when you rev it, it's sluggish...
Inital launch from first gear is sluggish, It'll stutter, and chug on launch.
When riding, there just is no a$$ end to it, when you get on the throttle...
When you have all 4 running, she'll take off like a shot, when you open her up, no doubt...

Try carefully feeling the headers, one will be stone cold..
You could use an infrared thermometer, which can be had fairly inexpensively, if you're not comfortable with the idea of fooling with the headers...
Once you determine which one is cold, try swapping spark plugs around with one from an adjacent working cylinder, and see if the problem follows.
If it does, it's the plug. If not, it's possibly a coil, or wire. try swapping one of those around, and see if it follows.. then it would be a coil, etc...
10-03-2008 12:40 AM
lanbrown
Re: Running on three cylinders??

I ride wasy until at least 168 and then a few more miles. The thermostat should be 168 degrees.

If it were three cylinders it would be rough and would probably shake.
10-03-2008 12:31 AM
temperedtim929
Re: Running on three cylinders??

If it were running on three what are the indications? Also what is the best operating temp?... i never really get into the throttle till its at least 140ish..??
10-03-2008 12:26 AM
lanbrown
Re: Running on three cylinders??

The engines are warm blooded at times and like to be up close to operating temp before they really want to work properly. IMO, the early FI engines from Honda were like that; stumbled a bit and when cold.
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