2001 yamaha neos 50 tunning and whistle

take your transmission case off and check everything is sound like clutch wear clutch bell and that everything is tight also check that your fan is ok and nipped up are you loosing anypower at all ?

 

no power loss,will have to check if the fans ok,have put a new clutch on it as old one was blue,also new gear bearings,clutch bell is blue but the noise seems to come from under ur feet when u ride

 

belt slip maybe or a main bearing on its last legs...or maybe just the sound of the fan spinning around and displacing air.

 

gonna take engine out this weekend n replace crank bearings its a standard top end on it,woul i need and special tools to change the crank bearings?

 

youll need to get the variator and clutch nut off, so an electrical impact gun or the relevant holding tools will be required...plus your gonna need a heat gun to heat the cases up...apart from that, the normal socket set and screw drivers etc for working on engines...

 

i wondered with all the heat the clutch bell took from the original clutch,could it be damaged somehow? is there something on the clutch thats only done 150miles that would give away if thats the prob because its more of a ringing when u have the case off

 

my gilera has this whistle sound aswell, iv replaced the belt, clutch, compressor spring, clutch springs, and the poxy thing is still making this sound at high revs :banghead:

 

the thing is they do kind of make a slight high pitched noise at certain revs, if its otherwise running ok, i wouldnt worry too much..

 

now getting oil from the breather pipe when its been running!

 

breather pipe from where ? if its a 2 stroke there is no breather pipe from the engine...

 

Blue burnt clutch bell can be caused by the clutch slipping, thats probably the main problem. The whining noise could be a number of things, belt slip, dodgy bearing somewhere, knackard transmission gears.

If the whole clutch bell is burnt blue then your just fucking lucky it never caught fire. Think how mega red or even white hot it must have gotten to turn blue.

The bell on my skipper has a few blue heat marks on it from when I did a burnout before having a fresh tyre fitted a while ago, smoke poured from the tranny casing as my clutch was slipping and is pretty much naff now.. Thank god nrgandy is hooking me up with a newish one.

I would get a new clutch and bell, new drive belt and see if that sorts it. If not then your gonna need to dig deeper, bearings, gearbox replacement etc.

 

oil coming from a pipe off the carb,filter full and smelling of fuel,piston burnt behind the rings,so will replace all,wot a pile of crap to work on had to take all the body off to get at the top end!