unknown engine noise

[T1z3R]

hello gs people. i spent several hours last night reading every gs500 noise thread i could find on the entire internets and am as yet none the wiser.

ive only had this engine in the bike for a few weeks but until recently it had only been run on the stand to get it set up.

i set out on it the other evening for a short test run round the block which went ok although a little lumpy (due to the carbs i feel) but when i got back to the driveway and blipped the trottle this tick/clack/click/smack type noise started. have a listen.

http://www.youtube.com/watch?v=OWrl7-WKgos

http://www.youtube.com/watch?v=06TUrMN8P08


ive taken the head back off and double checked timing, cam chain, tensioner, cams, lobes etc and nothing seems out of whack. valves are within tolerance and ive fitted a brand new genuine head gasket but the noise remained after i put it back together although seems louder and lower down in the engine than before.

my dad thinks its from the cylinder area but i think its from the upper crank but we both agree its from the left side.

before it gets a full tear down im hoping anyone can offer some suggestions as to is cause/source cos im almost bald from it.

[Paulcet]

Left side....  not likely but maybe do a search on "goat's" (here on GSTwin, not google!  Not that there is anything wrong with that...)

[T1z3R]

thanks for the reply.
im familiar with goats but does it make that sort of noise?

[The Buddha]

Unbalanced feel, and noise from left definetly bears checking out for goats. And yes Mine made horrible noises, but I was so far gone on mine ... but think about it, rotor and stator hitting each other will be noisy.
Cool.
Buddha.

[Homer]

If it is GOATS, talk to SlimKlim.  He's got parts you may want. 

[Twism86]

Whats is this "GOATS" you all are talking about?

[The Buddha]

Whats is this "GOATS" you all are talking about?

Alternator rotor and stator make contact and pretty much bash each other to pulp.
Cool.
Buddha.

[Anaconda]

yeah, sometimes i get that on my bike too, particularly if i'm slowed down to turn into a parking spot. lol sometimes it'll get embarassingly loud, but i'm familair with hearing that sound too.  whe you figure out what to do, i'd love to know as well.

[The Buddha]

Yours could be the cam chain ...the imbalanced feel and noise out the left end of the crank = goats. Remmeber drive chain also is on the left.
Cool.
Buddha.

[Anaconda]

@ buddha,  maybe you've seen the vid i posted up before, but maybe you can solve it if you heard it too.  http://www.youtube.com/watch?v=hl5byiFCNwk

[cHa0s]

sounds like the cam chain....

[Anaconda]

sounds like the cam chain....

Alrright. I'll bring it to my friend and have him check it out.

[T1z3R]

got about 4mm vertical play in the left piston/conrod so looks like the big end went.

[cHa0s]

got about 4mm vertical play in the left piston/conrod so looks like the big end went.

left cylinder? did you run the engine without oil? 4mm is mad. the rodbearing has a thickness of 2x 1.5mm.....

[T1z3R]

engine hasnt been run for any length of time in my possession so unsure how it was treated previous.
4mm may be a slight exageration but it feels like a lot of movement.