noise from the engine

[dirk]

hi folks

since ? i have a new (in my ears) bad noise from the engine.
i can’t explain the noise and not accurate localize.
it is not the clutch and rotation speed dependent.
it sounds like a dc motor?
the noise is very similar to this rs125 (not so loud)
http://www.youtube.com/watch?v=93QWrJH7k_o
or this KR. (you can hear the noise after the revs come down)
http://www.youtube.com/watch?v=Lp8qbCONpCY
apart from that the engine runs fine without temperature problems or loss of power.
crank is ~ 3800 miles “old”, barrels and pistons perhaps 450 miles.
runs only on public roads.

any ideas?

cheers

dirk

[dirk]

Hi

ok ok
the clips above are not the best examples.

here is a clip from my bike.

http://www.divweb.com/rd/mykawa/test.html

is this ambient noise normal??
i am more or less sure this noise is new after i rebuild the engine.


Cheers

Dirk

[alanw]

Hello Dirk, It's difficult for anybody to be absolutely Sure without fear of being wrong & mis'advising you ..... But I'll break the ice & say !!!!!!!!!!!!
It sound's as I would expect with a " just rebuilt engine, it's a "running in"
sound that will slowly disappear as you use it. Sounds sweet to me !.
( usual disclaimer applies ). Alan

[mgtkr1]

are you reffering to the whine? sounds like the primary gears on the tight side. just a factory tolerance/discrepancy thing i reckon. if you get x2 gears that are both on the upper end of the tolerance they are obviously going to be a touch tighter. my spare motor makes the same noise but with a diffrent clutch/primary it goes away. other than that i hear nothing else. to me it sounds perfect, poss everythings a bit tight given that its new. if it revs up freely i wouldnt worry. in fact it sounds pretty sweet.

[the-elf]

That sounds quite normal, Mine makes a hell of a lot morew of a racket when cold but sounds sweet once warmed up. Its quite easy IMHO to get parariod over engine noise at times. For an engine as new as yours with everthing as sweet as you said except the bit of noise then I won't worry.

[JanBros]

ok to me .

[666damned]

agree with some of the other guys...............sounds fine to me...

[wakasaki]

What Noise.....Oh?
That.....
Geeerrrrrrrrr zzzzzzz geeerrrrrrrrr zzzzz
cruncccccccccccchhhhhhhh zzzzzzzzz
grrrrrrrrrrrrrrr zzzzrrrrrrrrrrrrrrrr
Daggggggggggggggggrrrrrrrrrrrrrrr
Spannnnnneeeeerrrrrrrsssss innnnn aaaaa
saaaaaaacckkkkkkkkkkk?
Yeah fine...

[dirk]

Good morning everyone!:)

thanks for the feedback!

are you referring to the whine? ..

yes

i know 5 KRs in Germany.
none of this bikes makes a similar noise.
it is strange.

sounds like the primary gears

that's possible.
i have research this hint.
some other bikes (BMW K100, h***a VTR, Triumph Speed Triple,... ) makes the same whine.
the cause for this bikes is the spur-toothed primary drive.
not nice but no problem.
the kr has a spur-toothed primary drive.

and yes
i am a little bit paranoid.
in 2 years and only ~4000 miles:
"new" crankcase, new crank, new cylinder, new pistons, "new" cylinder head, new alternator and many many other parts.
and now this strange noise


KR-1S?
give me two and a lobotomy please

cheers!
Dirk