Sounds like a blender with some small pebbles while decellerating

WageSlaveEscapist · August 29th, 2015, 03:41 PM

When I decelerate in 3rd gear, clutch out, (not sure yet if the other gears too), I sometimes hear an irregular ticking/clacking sound. It sounds like metal, like if you were to put a few pebbles in a blender with water and hit blend, (but it's not that loud) or if you were to drop some marbles down a pvc pipe, or the sound of hydraulic cavitation almost. I have removed my stock speedo cable and put a magnetic one in place. I do not notice the sound when clutch is pulled in. Bike has around 30k miles, made in 2004, and has been well taken care of with mobil 1 turbo diesel truck oil. I'll put my centerstand back on and see if the problem persists, and try to get a sound byte while riding. Any ideas? The bike runs like a champ. I'm sure it's not the cam chain/timing chain, I've seen videos and it doesn't sound like a regular ticking. It's like tap tap..... tap tap tap tap...... tap...... tap tap..... .tatatap tap tatatata. No sound while accelerating. Valves were properly adjusted last week. Motor mount is solid. Chain slack in spec and wheel alignment checked with digital caliper 800 miles ago.

Motofool · August 29th, 2015, 05:49 PM

Quote:

Originally Posted by WageSlaveEscapist

.......... Any ideas?........

It could be the top leg of the secondary chain rubbing against the swingarm while is slacking.

You took the CCT apart and cleaned and lubed it while doing the last valve adjustment, I assume.

It could also be a worn cam chain guide.

ninjunk · August 31st, 2015, 03:07 PM

have you drained and checked the oil since the noise started happening?

usually when i hear scary engine noises i do that first to try to catch any potential chunky bits before they wash around the whole engine.

WageSlaveEscapist · September 3rd, 2015, 08:05 AM

Oil has been drained and refilled since the noise appeared, and oil screen has been cleared. No change.

After viewing a few videos, it seems the cam chain/cam chain tensioner seems to make a regular, loud ticking noise. My noise is irregular in rythm, much quieter, and not a definite tick. It's sounds like a spinning top is spinning inside a pvc tube, hitting the edges of the pipe. I'm gonna have to find a way to get a sound byte, I know this is vague.
Thanks so much for the info guys, I'll have to check my cam chain tensioner. It felt very tight just pushing my finger against it, and I thought it was just lubed by engine oil. By secondary chain I assume you mean drive chain? I will have to check to see if it is hitting, my chain slack has become out of spec since I last adjusted it last month.

csmith12 · September 3rd, 2015, 08:22 AM

Try just resting your hand on the clutch lever when you hear the sound, these are a known noise creator
Try cleaning and lubing your chain
Did you get any debris in the cush drive?
Check the wheel bearings
Ensure your sprockets are tight (front sprocket cover too)
Check brake caliper bolts for tightness
Lube the slides on the brake calipers
Check all fairing bolts for tightness
Check engine bolts for tightness
Check rear shock dogbone bolts for tightness

Actually... when was the last time you did a FULL service on the bike?

greg737 · September 3rd, 2015, 10:38 AM

I thing your engine is okay, no problem, I think you're hearing the transmission.

The scenario you've described: coasting a sequential constant-mesh gearbox with clutch out, will pull the the "dogs" of the engaged gear (third gear in your description) against the opposite side of the "windows" in the adjacent gear (into the deceleration end rather than into the acceleration end).

Then, as you decelerate, you occasionally create a (transient) condition where the "big bang" firing order of the EX250 engine causes the gear-dogs to jump around in the windows of the gear into which they're engaged. The resulting noise is a liquid-muted (by the engine oil-bath) metallic "clacking" sound.

August 29th, 2015, 03:41 PM	#1
WageSlaveEscapist ninjette.org member Name: Escape Location: pdx Join Date: May 2013 Motorcycle(s): ninja 250 classic Posts: 15	Sounds like a blender with some small pebbles while decellerating When I decelerate in 3rd gear, clutch out, (not sure yet if the other gears too), I sometimes hear an irregular ticking/clacking sound. It sounds like metal, like if you were to put a few pebbles in a blender with water and hit blend, (but it's not that loud) or if you were to drop some marbles down a pvc pipe, or the sound of hydraulic cavitation almost. I have removed my stock speedo cable and put a magnetic one in place. I do not notice the sound when clutch is pulled in. Bike has around 30k miles, made in 2004, and has been well taken care of with mobil 1 turbo diesel truck oil. I'll put my centerstand back on and see if the problem persists, and try to get a sound byte while riding. Any ideas? The bike runs like a champ. I'm sure it's not the cam chain/timing chain, I've seen videos and it doesn't sound like a regular ticking. It's like tap tap..... tap tap tap tap...... tap...... tap tap..... .tatatap tap tatatata. No sound while accelerating. Valves were properly adjusted last week. Motor mount is solid. Chain slack in spec and wheel alignment checked with digital caliper 800 miles ago.

September 3rd, 2015, 08:22 AM	#5
csmith12 The Corner Whisperer Name: Chris (aka Reactor) Location: Northern KY Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much. MOTY 2015, MOTM - Nov '12, Nov '13	Try just resting your hand on the clutch lever when you hear the sound, these are a known noise creator Try cleaning and lubing your chain Did you get any debris in the cush drive? Check the wheel bearings Ensure your sprockets are tight (front sprocket cover too) Check brake caliper bolts for tightness Lube the slides on the brake calipers Check all fairing bolts for tightness Check engine bolts for tightness Check rear shock dogbone bolts for tightness Actually... when was the last time you did a FULL service on the bike? __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

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August 31st, 2015, 03:07 PM	#3
ninjunk Lostcause enthusiast Name: Graham Location: Austin, TX Join Date: Jan 2015 Motorcycle(s): 2000 EX250F Posts: 178	have you drained and checked the oil since the noise started happening? usually when i hear scary engine noises i do that first to try to catch any potential chunky bits before they wash around the whole engine.

September 3rd, 2015, 08:05 AM	#4
WageSlaveEscapist ninjette.org member Name: Escape Location: pdx Join Date: May 2013 Motorcycle(s): ninja 250 classic Posts: 15	Oil has been drained and refilled since the noise appeared, and oil screen has been cleared. No change. After viewing a few videos, it seems the cam chain/cam chain tensioner seems to make a regular, loud ticking noise. My noise is irregular in rythm, much quieter, and not a definite tick. It's sounds like a spinning top is spinning inside a pvc tube, hitting the edges of the pipe. I'm gonna have to find a way to get a sound byte, I know this is vague. Thanks so much for the info guys, I'll have to check my cam chain tensioner. It felt very tight just pushing my finger against it, and I thought it was just lubed by engine oil. By secondary chain I assume you mean drive chain? I will have to check to see if it is hitting, my chain slack has become out of spec since I last adjusted it last month.

September 3rd, 2015, 10:38 AM	#6
greg737 - Name: - Location: - Join Date: May 2009 Motorcycle(s): - Posts: A lot.	I thing your engine is okay, no problem, I think you're hearing the transmission. The scenario you've described: coasting a sequential constant-mesh gearbox with clutch out, will pull the the "dogs" of the engaged gear (third gear in your description) against the opposite side of the "windows" in the adjacent gear (into the deceleration end rather than into the acceleration end). Then, as you decelerate, you occasionally create a (transient) condition where the "big bang" firing order of the EX250 engine causes the gear-dogs to jump around in the windows of the gear into which they're engaged. The resulting noise is a liquid-muted (by the engine oil-bath) metallic "clacking" sound.