Engine noise I'm noticing under acceleration

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Apr 15, 2016 | 11:50 PM

#21

s10gto

Senior Member

Joined: Nov 2014

Posts: 476

From: Lakeville

1st Gear Member

Quote:

Originally Posted by 2veedubs

Sounds good to me. The stock exhaust is so quiet, you can hear the subtle motor noises. Get an aftermarket slip on muffler, problem solved.

I agree. With stock exhaust the engine is very mechanical sounding. I believe you are fine. All I hear is normal valve train and intake noise.

May 17, 2016 | 04:14 PM

#22

RsoJim

Junior Member

Joined: Jan 2012

Posts: 6

From: St Cloud Florida

engine noise

I am reading lots of good suggestions to try. I had the same problem on my 2012 KLX250S with 5000 miles showing. Under acceleration I had a noise that sounded exactly like plastic vibrating on metal. I removed everything I could and it was still there. Turned out it was the front sprocket with some wear. I am changing both sprockets and chain this week. I ordered the sun sprockets and chain from e-bay. I have used these before am satisfied with their use. Every time I rode my bike the noise got progressively worse until I was afraid something was ready to fall off. Now to change the subject just a little bit, I added the ground wire and now my high speed miss is gone and it feels like I have more mid range power.

May 19, 2016 | 11:45 AM

#23

MaverickAus

Senior Member

Joined: Jan 2006

Posts: 3,483

From:

1st Gear Member

Sounds normal to me

May 20, 2016 | 01:21 AM

#24

klx678

Senior Member

Joined: Aug 2009

Posts: 4,650

From: Delaware, Ohio

1st Gear Member

Listen closely around the engine to try to locate the source of the noise.

Mar 15, 2020 | 12:32 AM

#25

Jeromie Norton

Junior Member

Joined: Jan 2020

Posts: 1

I have that exact sound !!!

Quote:

Originally Posted by queen of spades

New owner of a 07 KLX250S with 4k miles. During a ride around the hood earlier tonight I noticed a noise that sounded a bit odd. It's a kind of rattle or light knock when the bike is under hard acceleration. I've experienced ping/detonation on several bikes but this doesn't sound the same. The engine almost sounds like a diesel when the noise occurs.

Bike is mostly stock. It has a K&N air filter, stock carb & exhaust. As far as I know a jet kit wasn't installed.

What could the noise be if not ping?

This isnt just regular engine sound mine started at 4000 or 5000 and I thought it was my cam chain got new cam chain didnt fix then I thought it was my oil pump because my sound only happens after hard accelaration at high rpms but I checked a few things and its not.... I have thought of everything except the crankase releif valve and the sound seems to be coming from the front of the motor right were this valve is so im going to replace it and see if that works because I have a feeling I overfilled it a couple of times and thats what went bad

*correction* I looked up what I meant to say.... its the air suction vavle on the diagrams for the cylinder head ... I think it goes back and makes the "suction" sound I hear maybe this is your problem too?

Last edited by Jeromie Norton; Mar 15, 2020 at 12:45 AM.

Mar 15, 2020 | 07:32 PM

#26

IDRIDR

Senior Member

Joined: Oct 2010

Posts: 4,507

From: SW Idaho

1st Gear Member

Jeromie,

Welcome to KF.
You're replying to a several year old thread, just FYI.
Check into Krieger's manual cam chain tension adjuster as a replacement to the Kawasaki auto unit. The stock unit is a well known failure point resulting in noise in the rpm range you're describing. I have one, as probably hundreds of other KLX250 owners.