puffing clicking grinding sounds and running rough!

[linnix13]

so my engine(66cc slant head boost bottle 4100kms old) is runnign strange, it takes a block to start it and it wont start full choke anymore i have to leav it halfway and pedal till it fires up, it buzzes loudly on 90-100% throttle but is fine below that, and it vibrates and puffes and weezes and clicks if i run 0 throttle coasting with the engine engaged but going down a hill, also it makes grunting sounds and only has power from 20kph to 40kph then it gets an insane power boost from 40kph+ but any faster than 40kph and it runs like ****, is this just from being old and well used?

 

[nadroj]

it would say check the rings. you shouldnt let your 2 stroke just coast down a hill like that. it doesnt give the engine enough oil.

 

[little bird]

sounds like crank seal has push out/ or is shaged .obviously running lean,leaking inlet manifold or base gasket.

 

[GearNut]

It sounds to me that your crank case bearings are worn out and the crankshaft is wobbling about. There is no way a seal can grip a wobbling shaft and this will cause air leaks at the crank bearing seals, causing the poor performance and hard starting.