Knocking at low RPM's (new here) - Honda Motorcycles - FireBlades.org
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post #1 of 21 Old 09-27-2008, 2:44 PM Thread Starter
 
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Knocking at low RPM's (new here)

So I am new to the CBR community having just bought my first 2000 CBR 929. I owed a 94 ZX7 prior but didn't have it long. After getting my new CBR home I started to notice a few things I wish I had notice while test driving the bike before I paid 4 grand for it.

The first and scariest to me is a slight intermittent knock at low RPM's. The knock only happens from 1,000 Rpm's to 4,000. I do see the RPM gauge bounce a bit when the knock occurs. It happens very spurratically and is never predictable and goes away with any rpm's over 4,000, constant or just revving.

The second is a low idle... starts up everytime with ease but have to keep it running sometimes. It will occasionally flame out the tailpipe...mis-firing i suspect.

Third, FI indicator on and MIL light flashing 2 blinks.

The last thing is that the headlight, backlights on digital gauge and blinkers stopped working...

The knock scares me, the rest I know can be fixed. All these problems seem to be at idle.

Does anyone know what this knock may be... could all my problems be related? Ive worked on cars all my life but never bikes so I have no idea what noises are normal and what noises I should be concerned with.

The bike rips down the road and all the prblems seem to go away, but all the problems occur at idle.

DID I GET TAKEN FOR A CHUMP WITH A JUNK ?????
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post #2 of 21 Old 09-27-2008, 3:50 PM
 
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Re: Knocking at low RPM's (new here)

Knock sounds like the infamous Cam chain tensioner. Do a search and you will find LOTS of topics on that, and its treatment. What kind of exaust do you have and does the bike have a power commander? Aftermarket pipes and stock fuel maps can sometimes cause FI errors just like my 1000 did when I threw on the Jardine with no PCIII. I don't know about your GUAGE, but, the lights are supposed to turn off when the starter button is pressed. Allows more power for cranking. Do a search for that as well. I have seen a LOT of posts recently about something happening in the starter switch on 929's that causes them to leave their lights off before/during/after cranking. Good luck.

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post #3 of 21 Old 09-27-2008, 4:37 PM Thread Starter
 
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Re: Knocking at low RPM's (new here)

Thanks Fox. I have seen a lot of post about the came tensioners...which is good. My concern was that maybe it was a bearing or piston flopping about...

I checked the code for the blinking MIL and it said faulty MAP sensor... I do have a two brothers exhaust so maybe that's it? I do not have a power commander nor do I know what they do.

Is backfiring normal?.....flames out my tail pipe at high RPM's?....

How bulletproof are these engines?

If anyone else has any input im all ears. THANKS

Newby.
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post #4 of 21 Old 09-27-2008, 4:44 PM
 
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Re: Knocking at low RPM's (new here)

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Originally Posted by temperedtim929 View Post
Thanks Fox. I have seen a lot of post about the came tensioners...which is good. My concern was that maybe it was a bearing or piston flopping about...

I checked the code for the blinking MIL and it said faulty MAP sensor... I do have a two brothers exhaust so maybe that's it? I do not have a power commander nor do I know what they do.

Is backfiring normal?.....flames out my tail pipe at high RPM's?....

How bulletproof are these engines?

If anyone else has any input im all ears. THANKS

Newby.
Flames could be over fueling?

These engines are pretty strong (if you treat them well) - My 954 has done about 20k miles, and she is running sweet still.

A power commander "re maps" the ECU and you can get them set up to your can/exhaust system/what ever else you do to her. You can get different maps too.

on the CCT. Do a search and u'll find what you are looking for.

"Second is the first of the losers..."
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post #5 of 21 Old 09-28-2008, 4:59 AM
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Re: Knocking at low RPM's (new here)

The backfiring could indicate that a valve is still open when it fires which might indicate worn camchain or tensioner or tight valve clearances.
What mileage is on the engine?

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post #6 of 21 Old 09-28-2008, 11:26 AM Thread Starter
 
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Re: Knocking at low RPM's (new here)

The bike has 18,200 miles. So What should i replace?
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post #7 of 21 Old 09-28-2008, 11:31 AM
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Re: Knocking at low RPM's (new here)

You'll have to replace whatever is worn...
Probably pull the valve cover and check your clearances and springs and check the cam timing is correct as well as chain wear.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #8 of 21 Old 09-28-2008, 12:03 PM Thread Starter
 
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Re: Knocking at low RPM's (new here)

Will these bikes go 30,000 miles?
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post #9 of 21 Old 09-28-2008, 12:11 PM
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Re: Knocking at low RPM's (new here)

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Will these bikes go 30,000 miles?
Bikes can go to 200,000+ miles. It all depends on how you ride and maintain them.

Why is your bike knocking at 1,000 RPM? The idle should be between 1,200 and 1,500 RPM. This is a motorcycle and not a car.
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post #10 of 21 Old 09-28-2008, 12:15 PM
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Re: Knocking at low RPM's (new here)

Of course.
I'm sure there are members here with 100,000miles now.

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post #11 of 21 Old 09-28-2008, 12:19 PM
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Re: Knocking at low RPM's (new here)

I thought that as well Ian as these things sound like Ducati's if the idle is too low :-)
But that wouldn't make it knock to 4000rpm though.

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post #12 of 21 Old 09-28-2008, 12:23 PM Thread Starter
 
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Re: Knocking at low RPM's (new here)

Well the bike idles real low. but when I hold the throttle between 1000 rpms and 3000 I get this knock every 4 or 5 seconds sometime longer, its completely un predictable but stops with any rpm over 4000. I payed 4 grand for the bike and didn't expect it to be perfect but I'm worried there may be major internal damage here. Bike overall looks like its never been down but definetly ridden hard.

The only other mech problems appear to be flames out tail pipe at near redline rpms, MIL and FI lights on (2 blinks....MAP sensor?) and the low idle.
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post #13 of 21 Old 09-28-2008, 12:30 PM
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Re: Knocking at low RPM's (new here)

At redline the flames might be the limiter cutting the ignition.

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post #14 of 21 Old 09-28-2008, 12:32 PM Thread Starter
 
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Re: Knocking at low RPM's (new here)

Well back to the knocking.... if it were something like a junk piston or bearing or something big would'nt I most likely get noises throughout the rpm range?
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post #15 of 21 Old 09-28-2008, 1:56 PM
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Re: Knocking at low RPM's (new here)

I would've thought so if it didn't simply throw a rod through the block near redline.
If you do an oil pressure test that should give you an indication of bearing condition.
A compression test should rule out piston problems.
Has it got good clean oil in it?

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