Soft knocking / pinging sound

[Zepfan]

Under load when hammering throttle in low RPM's my bike has a soft but noticeable knocking ( or maybe stumbling ) sound and feel. Kicks up rapidly to smooth engine sound / feel.
The bike's always run that way. It runs "good," just noticeable sound & feel.

IS IT NORMAL? :

Had a failed attempt to flash here locally.
I was excited to see if it would make a difference but had to abort after discovering mechanic lied about his past experience. ( Lees Cycle ) I took the ECU out of his hand after him fumbling around trying hand wire plug ( adapter ) for 2 hours. Told me initially he had done a few then after an hour I asked how things were going. Then the story was he had to make a plug! I asked him why! His reply was that the S 10 he flashed was from Europe Another hour passes and I question him further. He didn't want to admit to.... ahum.... "misleading," me. : :
Dam liars! : : : : : : : :

 

[Dallara]

~


Four characters for you...

A

F

1

Ed Cook

That will solve your re-flash problem. ::025::

Dallara



~

 

[avc8130]

I know ECU-U's interface is a little "hokier" than the FT I use. They require the "flasher" to attach wires to the pins. My FT harness has the proper connector. The ECU-U is "universal" to all the bikes they flash whereas the FT is model specific.

Really it shouldn't be an issue either way.

ac

 

[Nimbus]

I'm not sure if mine still does it or not, but for quite a while, if I got on it at relatively low rpms in 2nd or 3rd gear (really any gear between 2500 and 3500) it made a horrible knock like sound. I sync'd the throttle bodies and made the little airscrew adjustment and it seemed better. But, then again, I got scared of the sound and basically quit trying to give it much of any throttle below 3K.

Then I had it flashed and it seems like it doesn't do it anymore. It still has a bit of a knock'ish growling sound, but I'm not convinced it isn't intake noise. Anyway, I decided that since I wear earplugs I can't really hear it. Sort of a ::021:: thing. I figure that if the engine eats itself, I'll just never buy another Yamaha.

 

[HHH]

I read on the owners manual when traction control goes to play, both, the engine and exhaust may sound differently. I was able to confirm that on my moto, I hear the same knocking noise in the circumstances you mentioned, I am now under the assumption it is some sort of programed fluctuation on the injection... I am not worrying about it anymore. ::26::

 

[RED CAT]

Sounds more like you need to put real gasoline in there not corn oil. Try Octane Boost.

 

[HHH]

Sounds more like you need to put real gasoline in there not corn oil. Try Octane Boost.

Yeap, dang Florida don't have anything over 93 octane ::010:: (which BTW is the one I use from day one)

PS. If I have to put octane booster on top of 93, what will I have to use when I travel to South America?!? ??? :

 

[bikerdoc]

Yeap, dang Florida don't have anything over 93 octane ::010:: (which BTW is the one I use from day one)

PS. If I have to put octane booster on top of 93, what will I have to use when I travel to South America?!? ??? :

Beetle Nut