Question about 1990 Yamaha XJ 900 F

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Is it normal to hear loud tappet noise at low revs and acellerating from low revs

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That is either piston slap or little end bearings, Has it done may miles?
Not a lot can be done to stop that except take the head off and check for wear. It isn't pinking is it? If it is, either use a higher grade fuel or ****** the ignition to stop it.
Ride safe.

Posted on Dec 30, 2010


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1 Answer

How to adjust the tapets if they are making noise in Toyota 2e engine

check your engine oil.on low engine oil you will hear tappet noise.
also you can buy tappet noise reducer from motor spare shops.

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What is tappet noise at higher revs

Could be thin oil, worn lifters, old oil, other worn valve train parts or normal. I have no idea why but synethetic oil seems to have higher tappet noise.

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Ticking clanking noise miata

This noise you hear is the hydraulic tappets ,there gummed up change the oil and use a cheap diesel/petrol engine oil a 2 second squirt of fairy liquid into the oil filler and leave for a couple of thousand kms then change the oil again and this will clear the gummed up holes allowing the hydraulic tappets to re adjust

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I have a 2001 harley heritage. Wondering how often I should have the valves adjusted. Thanks

Your engine is equipped with hydraulic tappets just like your car engine has. There is no way or need to adjust the valves. If you're hearing a slight tapping noise under the rocker box covers, this is normal. If you're hearing a loud tapping noise that comes and goes, it could be a roller on the end of a tappet going bad and you should have it looked into.

Good Luck

Jun 01, 2011 | 2001 Harley Davidson FLSTS Heritage...

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Tapping coming from front cyclinder

Since I can't hear the noise for myself, the only thing I can do is give you my ideas as to the cause. Is the noise a ticking noise or a knocking noise?

First off, if it's not loud enough to make people turn their heads when you start the bike, don't worry about it. Your engine is the old pushrod design and the rocker arms are going to make a little noise. Moving mechanical parts make noise.

Now, if it's a loud noise, my first guess would be that you have a bad tappet. Either the hydraulic part of the tappet is bad and is not keeping the pushrods to zero backlash or the roller bearing on the end of the tappet is bad.

If you're sure your problem is on the front cylinder, pop the pushrod tubes loose on that cylinder. Feel of the pushrods. If you feel on that is loose, there's where your problem is. Pull the rocker box, take the rocker arms out of the lower plate and then pull the tappet block. You'll probably find a bad tappet. If so, make sure you check the camshaft for damage as well.

Good Luck

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1 Answer

I have a 2002 Chevy Tahoe. for the past 6 months

without hearing exact noise it is hard to diagnose. these vehicles had a normal cold start knocking noise due to the low friction rings used allowed piston some extra movement. when carbon builds up on pistons it gets worse will go away after about a minute running. it does not affect life of engine or performance. i think this may be noise you hear. or possible it is a lifter leaking down and taking a while to pump up

May 24, 2010 | 2002 Chevrolet Tahoe

1 Answer

Top end chattering sounds like rockers bike only has 11000 miles seems early to be the rockers chattering

This is not good. The sportsters, and Big Twins, all have hydraulic tappets and there should be no chattering coming from the rocker arms. The hydraulic tappets are designed to keep the rocker arms at zero backlash.

Oil pressure, keeps the tappets pumped up prevents the rockers from clattering loudly. If you have a major problem you will have a clearly audible clatter that you won't have to "try" to hear. You can hear them clatter from ten feet away. If you have to get your head down beside the rocker box to hear any "chattering" the rockers are making, this is normal. You simply can't have that much mechanical movement going on in there and not hear anything.

With the engine running, pull the oil filler plug out of the oil tank. Shine a flashlight into the tank and rev the engine up a bit. You should see oil squirting back into the tank from the return back towards the rear of the tank. If you don't see it, look for small foamy bubbles on top of the oil. If you see the oil returning to the tank or the surface of the oil is foamy looking and moving around, your oil system is operating properly. If you oil tank gets hot when you are riding the bike, your oil system is working fine. Harley engines employ a high volume low pressure oil system. The Sportster engine is probably the toughest engine Harley has ever invented.

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Only diagnostic equipment can find the problem.Probably low pressure into inlet air system.

Apr 17, 2010 | 2001 Saab 9-3

1 Answer

A fairly consistent tapping noise from the top of the engine between 50 - 70 mph. After 70-75 mph in seems to quiet down.

sounds like a lifter is bleeding out or starving for oil at low revs
check oil level and oil pressure
if thats good lifter or tappet clearance next to check
is engine seviced regularly?
slugde build up can cause problems also
if V6 petrol see a lot of worn valve guides causing noise worse when warm and noise comes in and out at 1200RPM
tappet clearance issue noise would be there all the time
lifter can also come and go while holding revs up

Jun 27, 2009 | 1999 Isuzu Rodeo

1 Answer

Ive got a tapping noise from the top end of my 125cc hypster

If the sound is light and regular it could be your tappet setting is a little too wide. This is a simple engine andif it is not too loud you could probably leave it, otherwise any motorcycle repair shop could reset it quite quickly. The problem is the tappets need to be set with the engine cold.

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