Two Stroke Motocross

Two Stroke Motocross Forum => Technical => Topic started by: Stusmoke on July 06, 2013, 07:05:51 AM

Title: engine knocking???
Post by: Stusmoke on July 06, 2013, 07:05:51 AM
http://www.youtube.com/watch?v=fv7eHbjiJrw&feature=youtu.be

is that a normal noise? it happened on my YZ250 and my CR125 before this.
Title: engine knocking???
Post by: factoryX on July 06, 2013, 07:25:25 AM
Does it always do it or some times?
Title: engine knocking???
Post by: factoryX on July 06, 2013, 07:26:26 AM
And does it go away when you rev it?
Title: engine knocking???
Post by: Stusmoke on July 06, 2013, 07:33:28 AM
Always does it but yes goes away when you rev it. Atleast I think it does. it might just be going to fast to hear it. Bigger pilot needed?
Title: engine knocking???
Post by: evo550 on July 06, 2013, 07:49:10 AM
Nah, that's just a ktm noise
Title: engine knocking???
Post by: factoryX on July 06, 2013, 07:51:38 AM
Ha.

What color is the plug?
Title: engine knocking???
Post by: TMKIWI on July 06, 2013, 08:30:33 AM
Thats what a 2 stroke sounds like Stu. ;D
Nothing to worry about. You should hear a KX250 idle  :o, sounds terrible.
Title: engine knocking???
Post by: vetman on July 06, 2013, 09:58:52 AM
could be your clutch plates vibrating in the basket they can rattle pretty hard depending on the model
Title: engine knocking???
Post by: Stusmoke on July 06, 2013, 11:02:55 AM
Thats what a 2 stroke sounds like Stu. ;D
Nothing to worry about. You should hear a KX250 idle  :o, sounds terrible.

I thought so. Like I said both my YZ250 and CR125 made a similar noise.

Ha.

What color is the plug?

White shes running lean. I already knew this I just wasn't sure if it was a lean noise or a normal one.

Thanks guys.

Title: engine knocking???
Post by: factoryX on July 06, 2013, 11:06:09 AM
Ah well, drop the clip then  ;D
Title: engine knocking???
Post by: cnrcpla on July 06, 2013, 05:14:28 PM
Ya broke it already? Jeez stu  ;D Isn't that under warranty? Ride the p!ss out of it and if it breaks use the warranty if its got one. If not, ride it hard anyways, its a new bike
Title: engine knocking???
Post by: evo550 on July 06, 2013, 11:04:50 PM
Ya broke it already? Jeez stu  ;D Isn't that under warranty? Ride the p!ss out of it and if it breaks use the warranty if its got one. If not, ride it hard anyways, its a new bike

KTM's don't come with a warranty....'cause they don't break..
Title: engine knocking???
Post by: nom de guerre on July 07, 2013, 12:57:54 AM
mine do the same.
Title: engine knocking???
Post by: cnrcpla on July 07, 2013, 01:35:01 AM
Quote
KTM's don't come with a warranty....'cause they don't break..
Huh... I wouldn't want a new bike with out a warranty. What if it had a proven factory defect, could you get it replaced or be SOL?   
Title: engine knocking???
Post by: Stusmoke on July 07, 2013, 08:08:31 AM
Quote
KTM's don't come with a warranty....'cause they don't break..
Huh... I wouldn't want a new bike with out a warranty. What if it had a proven factory defect, could you get it replaced or be SOL?   

They have, or atleast mine did, a selective warranty which basically means an ultra limited warranty. Obviously pistons/rings, oils, air filters etc etc etc aren't covered on a motocross bike but crankcase failure, crank failure within some small amount of time, and most other limited wear parts are covered according to my warranty booklet.
Title: engine knocking???
Post by: team499 on July 09, 2013, 05:01:16 AM
im pretty sure all motocross bikes are 30 day warranty try pulling the clutch in see if the noise goes away a little bit.
Title: engine knocking???
Post by: team499 on July 09, 2013, 05:03:06 AM
All my ktms have super noisy clutches but when i pull the clutch in the noise goes away. Not all the way but you should be able to tell its alot quieter.
Title: engine knocking???
Post by: Stusmoke on July 09, 2013, 08:55:47 AM
im pretty sure all motocross bikes are 30 day warranty try pulling the clutch in see if the noise goes away a little bit.

Seems silly. I could do alot of damage in 30 days. Particularly to a 125 :P In your signature, you say you have a 450 sx? 2003? I didn't realise KTM jumped on the 450 four stroke bandwagon that soon.
Title: engine knocking???
Post by: scotty dog on July 14, 2013, 01:47:54 PM
I think ya paranoid Stu, they all sound like it, the shock spring on my 01 used to vibrate on my 01 from new, first time I heard it I shat n thought It was gunna blow up til I seen the spring vibrating.
Just thrash the **** out of it mate and enjoy...
Title: engine knocking???
Post by: Stusmoke on July 14, 2013, 10:35:49 PM
I think ya paranoid Stu, they all sound like it, the shock spring on my 01 used to vibrate on my 01 from new, first time I heard it I shat n thought It was gunna blow up til I seen the spring vibrating.
Just thrash the **** out of it mate and enjoy...

You're not just realising my paranoia NOW are you?  ;) Yeah all is fine, you can't hear it from the saddle on idle. The only way I can make it out is when its idling I would guess because the higher rev just makes it into a smooth consistent sound.
Title: engine knocking???
Post by: team499 on July 15, 2013, 11:02:11 PM
Ya I think that was the first year of the sx 450
Title: engine knocking???
Post by: Stusmoke on July 15, 2013, 11:21:07 PM
Wow there you go I didn't realise KTM jumped into it that early. They drew early on the 250F aswell if I remember. Hows the 450 ride?
Title: engine knocking???
Post by: scotty dog on July 16, 2013, 04:06:16 PM
I think They brang out a 400 first if I remember right in 01 or 02