Question about 2003 Yamaha YZ 125

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Slight rattle coming off engine by power valve on low revs

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I suspect timing chain. Read the manual for the procedure to adjust it. If you don't have the manual, check out the library. I think you'll find the cycle repair books in 646 stacks.

Posted on Oct 11, 2009

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Posted on Jan 02, 2017

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2 Answers

Engine knocking at low revs gets less when clutch lever is pulled


Sounds like the clutch basket is worn you want to replace it really.

Mar 15, 2015 | 1998 Yamaha XJR 400

1 Answer

Engine rattle at idle or low revs


What kind of vehicle ? Which engine? Need more info.

Nov 19, 2013 | Cars & Trucks

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Rattling noise when at low revs


the rattling noise most likely will be detonation. That is spontanious combustion before the spark occurs. causes vary but wrong octaine rating is one reason ,spark timing another.if you have an efi car it could be at the timing sensor. or a distributor car the saprk advance is wrong. Some efi engines can't adjust to hot weather to well so the fuel setting go out. however be aware that you have to have this checked out as it can still occur at higher revs it is just that you can't hear it. End result will be holes melted in the top of the pistons

Jan 09, 2013 | Ford Cars & Trucks

1 Answer

It hasa slight rattle when reved but on cruise or on overrun it is very loud rattle which is in tie with engine revs but when it gets to about 2500 revs it is very sparodic


This could be anything from the valve settings being loose, to piston slop or wrist pins, to rod bearings. Really hard to say, since a rattle can describe a lot of different things. If you can isolate the location of the noise, it would help greatly in the diagnosis.

If you have access to a stethoscope, you can listen to different areas of the engine and tell where the noise is coming from.

No stethoscope, use a large screwdriver, put the tip against the engine and handle to ear. Move around the engine till you find the loudest noise. That will be the area that probably needs attention.

Apr 10, 2011 | Triumph Sprint RS Motorcycles

1 Answer

2006 Kia Sorento 4X4, Diesel. Starts right up but runs "rough" (more vibration than normal and valves rattle at low revs) and produces great deal of white smoke until engine heats up (after about 2-3...


i would check all the basics like spark plugs and check for vacuum leaks around the intake manifold.With a can of 2+2 carb cleaner while engine is running --if idle goes up or down that is were your leak is--
check egr too, Lee

Feb 14, 2010 | 2007 Kia Sorento LX 4x4

1 Answer

98 Ford Explorer engine/exhaust noise


When catalytic converters go bad, the porcelain matrix inside comes loose and is noisy.
But you can just unbolt it, break up the loose chunks, pour out the pieces, and it will run better than ever.
If you don't pass the next emissions test, then replace it.

But it could just be the heat shield rattling instead.
Take the shield off first, to see if it goes away.

Jan 03, 2010 | 1998 Ford Explorer

1 Answer

Loud rattling / buzzing noise from engine when cold not seconday air pump or air valve as already replaced.Timing belt,water pump and aux pullies all checked and ok.The colder the weather the louder the...


If the rattling changes with the revs of the engine, it might be that the valve compensators are either worn or not getting enough lubrication. 20V engines have quite small oil passages travelling to the head. They tend to clog up with gunk if the oil change is not frequent enough.

Jun 03, 2017 | 2003 Volkswagen Passat

2 Answers

Rattles at low reves only


THE RATTLING YOU HEAR AT LOW R'S IS MORE THAN LIKELY THE CAM CHAIN RATTLING. THE CHAIN TENSIONER IS ADJUSTABLE TO A DEGREE BUT A BIKE OF THIS AGE(IF OVER SAY 10000 MILES) MAY NEED A NEW CHAIN TO ALLEVIATE THIS PROBLEM. LOOSE CHAIN CAN CAUSE CAM TIMING TO VARIATE CAUSING A SLIGHT MISFIRE.
THIS MISFIRE COULD ALSO BE THE RESULT OF DIRTY CARBS. IF SO THEY WILL NEED CLEANING AND SYNCING.

Oct 21, 2009 | 2000 Suzuki GSX-R 600

1 Answer

Engine knocking


Hi,
Good news is - I don't think you need a new engine.

As there are many moving parts that could create a knocking sound, it usually needs careful inspection to identify where it is from.
I will give a list of some of the causes and remedies. Yours will probably be one of them, but unless I was there - it could be any.

Loose exhaust component (causes rattles and thumps) - replace parts or joints.
Loose Engine mounts - Engine will move about a lot more than normal - Replacement of mounts.
Fraying Belts - causes continual ticking or slapping - Replace belts and check tension.
Timing is off - bad running, lack of power, pre ignition or knocking at low revs. Check timing belt - Replace, Tune engine.
Cracked valve - slight misfire worse at low revs - Replacement valves.
Clutch Problems - Broken spring or loose bolt - Check clutch plate - replace clutch plates.
Older engines - often accompanying smoke -
Broken Piston ring - continual ticking or occasional misfire - Replace Piston rings
Worn Piston bearings - Piston Slap - Replacement of all piston bearings.

Transmission Problems (only heard when in gear or with clutch out) - Broken gear teeth or worn bearings - Replacement of Transmission or rebuild.

Some of these remedies require engine removal and strip down, others are a simpler fix.

Dec 26, 2008 | 1990 Cadillac Fleetwood

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