Im Worried - Pt2 (The Videos)

[Kr1stofer]

Right Fellas,

What do you make of this rattle then?

I hope you can tell which rattle im talking about.... !

In each of the vids i've made the noise in question occurs at idle and up to roughly 4-5000 rpm, then i cant hear it over the engine note.

It can be mostly heard as the engine slows to idle speed after each blip of the throttle - i took the generator cover off to check the flywheel is still bolted to the crank and it seems ok but i also noticed the noise increased when i did this leading me to think that perhaps its from the balancer shaft??

Anyway enjoy the show - suggestions please if you can??









These videos are via Photobucket and are a bit slow and jerky to say the least.....

[garye345]

the bolt even looks lose to me kris.
get a 13mm(i think)spanner and try tightning the bolt in the middle of the flywheel,if its that,stick the bike in first and put the rear brake on fully so you can get it resonably tight,then take it to a garage or kwik fit,and get them to tighten it right with a airtool,you know the ones they use to take the wheel nuts of with.
saves arsing about making/buying a flywheel tool thing.
if it aint that then someone who knows what there talking about will be along sooon!
good night jimbob

[Kr1stofer]

Hello mate,

I know what your saying about the bolt - looks a tad wobbly in the vid but it is'nt lose and the flywheel does'nt move or clunk when you rock it by hand.

That said, i will take a ratchet to it soon to make 100% sure....

My mate has a massively torquey (correct spelling)?? cordless drill thing he uses in the AA to get wheelnuts off - so i may ask him to use that maybe....

[Cliff]

The flywheel may be chaffing on the stator, remove it and check the stator is fitted correctly. Refitting the flywheel may seat it better also.
I had this on my old bike after i had fitted a different stator, if i recall i had to swap flywheels to stop it.
The other rattle sounds like normal two stroke piston slap to me, the more you listen to it the louder it gets. Either buy some louder chambers or park next to an old air cooled stroker, that will blot it out .

[the-elf]

If its a loose fly wheel remove it and check that the pin that locates it is still in one piece. Clean it all up and reassemble.

[666damned]

agree with Cliff m8y.sounds like good ol' piston slap.........

[Kr1stofer]

Thanks chaps,

I've heard of the term 'Piston Slap' but have never heard it myself to recognise the actual sound it makes - is that just something i can live with or will the old girl need a set of pistons and rings soon?

However, i do know what being pissed and slapped is like.....

I took a look at tightening the flywheel as suggested before by clunking it in gear and holding on the back brake but it did'nt seem any difference, in fact it was still almost imposssible to stop the flywheel moving anyway...and it felt like something was going to snap...so i gave up on that one....

Anyhow, after further inspection i found some slight scuffing to 2 of the flywheel holes which i assume someone has previously had a locking tool in place to be able to get the bolt undone - does this sound about right??

Im sure my engineering skills could muster up a locking tool so i will give that a bash this weekend - are there any tell tale signs (apart from the obvious scrape marks) to be found if a different stator has been fitted that may interffere with the flywheel itself???

I do appreciate all your help in this chaps...... =D>

Many thanks, Kris.

[mgtkr1]

for marks on the pickups (outside edge of f/wheel) and also inside as what cliff said made good sense. try pulling in the clutch while the motors running to eliminate clutch noise. a common problem thats nothing to really worry about, the ypvs do it and its accepted as the norm. if the noise goes when the clutch lever is pulled in then its that, just clutch racket. could be something else clutch related? the kr having straight cut primary gears is known to be a bit noisy. piston slap is another known trait of strokers. the kr is quite noisy anyway. to me, that sounds quite normal from a std bike/std pipes. sounds a bit boggy if anything, prob because the choke's on etc. if the racket goes after 4500rpm then it may just be typical resonance from the motors innards vibrating to wherever. double check the engine mounting bolts while the bodyworks off.

[SHimmer45]

doesnt sound "that" bad.

the motors do sound a bit agricultural on tick over etc anyway

[Kr1stofer]

Thanks for your views chaps,

I tried the pulling in the clutch idea first of all but its not that as the sound continues wether engaged or not, so not that...

I've not got the flywheel of as yet! but as soon as i get another puller i will give it a go, seems as tight as a ducks ass though....!

You were spot on to notice i had the choke on - maybe i should have gotten it warmer first but the noise is a little quieter when it is actually up to temperature.

I know that getting a diagnosis via this method is not ideal but i just wanted to get some opinions on what the noises maybe and if i need to strip the motor to get new pistons, rings, small ends, re plating, etc.

Thanks again for your comments fellas, most appreciated.

If anyone else can give their views - please leave a message

[Kr1stofer]

Have just viewed some of the KR1 video's on Youtube and can hear the same noise as i have on mine, so might i be a bit paranoid or are they shagged too.....?

[mgtkr1]

think it sounds normal to be honest. they are a bit noisy anyway. if your unsure on the milaege maybe throw in some new rings or piston/rings when you get round to it. i definitly wouldnt rush out a buy pistons based on the noise though.