runner strange sound

ok so my runner didint least me long ,
today i was riding it and some sound appeared
it only comes up at around 20mph its coming out from left side of the engine
it sounds like metal to metal or plastic rubbing ,
im very scared that this could be the crank bearing as it would cost me an arm and a leg to change them , i will check whats happening under side cover tomorrow ,
but maybe someone had it or know what this could be?
p.s bike runs as usual

THANKS

 

many times when crank bearings get tired, you will feel a vibration through the scooters foot boards. A quick DIY on the bearings is about £60 all in.

I have a longer, safer method, for installing crank bearings, than is usually used.

 

yp there is a plenty of vibration ...... where about do you live and could you do it for me like after christmas???
thanks

 

where are you, I am in Bedford. Depending where you are, I might be able to direct you to some one closer.

I will do a write up on it sometime, as it is very easy to do them right, yourself, the shorter method is fine for Minor or Shiny, or anybody that has done a few, but their method has risks for the novice.

 

westlondon mate

 

and can it go worse and cause some other problems if i keep riding it like for few months?

 

I wouldn't think about that until you have checked over the transmission .............. when the variator is off, hold the crank and check for any lateral play in the crank, up and down, a minute bit is acceptable. If you had a spare seal, you could of dug the old one out and looked for discolouration of the bearing, a definite sign of a over-heated bearing that is shot. Some times, with the belt off and the plug out, you can feel the notchyness of a shot bearing, by turning the crank very very slowly by the flywheel, it just doesn't feel right.

if a bearing is on its way out, you have to make a decision, why it is, if it is through age, then an upjet of one size and adding 1% oil to the petrol, or turning the pump up, can give you a breathing space, obviously keeping off the revs.

but if they are bad, especially if they have been fitted with no end float, or the bike has been abused, or run on cheap oil/wrong ratios, it is playing russian roulette with the whole engine, if the bearing lets go and breaks up.

the cost of a stripped engine, having a crank installation, is about £100-£120 plus parts, in the shop. Obviously there are people who will do it cheaper, I don't know if Minor is still available to do work in London ??

 

hi, i. havent checked yet but i think it could because of age as it dosent looked like engine was split before and its 2001 so its time to change , im thinking about goin for premix me set up is at the bottom could yo u tell me the amount of oil i need to mix with 1 l of petrol? thanks

 

40:1 is 2.5 %

25 mls to each litre of fuel or 125 mls to 5 litres, same thing, run a quality oil.

upjet 2.5% on the main jet, or state what is in there, and I will work it out.

 

ok thanks ill see what jet i got as im not so sure , i had the side cover off today had everything out crank is not loose at all but when i tried spinning a fly wheel with my had it would turn like a few times and then go like proper hard to spin and then it just repeats , oilpump is fine , but the rear axel has some slight movement

 

Thats probably compression pal

 

you mean piston and rings? bike still has all the power as before its just that noise

 

yeah but when you said you was turning your flywheel and then it went hard that will be your compression because at the same time you spin that flywheel your turning your engine over

 

but couldnt it be because of the bearing? so you saying i need new piston rings aswell?

 

He was just saying the resistance you felt when turning the flywheel would be the compression as you are turning the engine over. This does not mean the rings are shagged.

The rear axel as your calling it is the shaft for the rear pullys that could be your problem if the bearing the shaft sits in in knackered

 

ok i got what you mean now , and yh im not touching it for a moment as i dot have no money , i need to wait till spring to sell my aerox

 

give it here ill look after it until spring

 

i would rather give you my gily so you can fix it lol