variator shaft? By fubar05 (Read 960 times)

[fubar05]

hi all i have found something i am not sure of, my shaft that the variator is on moves in and out about 3/16 , is that supposed to move ?no wobble to it just straight in and out

[bige]

that shaft is the crankshaft, it shouldnt move very much

[fubar05]

i just cant figure this one out, i have great power at low end and the engine sounds great at wot , it just vibrates and loses speed ,i checked the sliders and belt ,witch look great the belt is going all the way to top of plate as well,and if i go down the road at even a slight downhill grade i can get to almost 80mph (speedo) ,but the same upgrade and i can't get to 55mph (actual)
has anyone els run into this?,and if so what was the fix? i cleaned the carb,did a valve adjust,intake was almost closed,exhaust was still good,plug looks great,new tires and rear wheel bearing ,
could bad gas do this ?
please help

[scootaway]

Fubar i guess that is about correct if the scoot is still standard ie. old air cleaner standard jets etc. The shaft must have end play.

[fubar05]

is end play ok?its not much but still !

[scootaway]

Without the end play any spinning motor even an electric one will not last. An internal combustion engine with vibration will destroy it self without end play.

[fubar05]

ok thank you for the reply ,i get it now.
i still have not figured out what is wrong with the scoot yet though,getting really hard to find other things to check,today i took out all fuel and air lines and inspected them,no problem or even suspect there,i did order a new sparkplug cap ,as i noticedf it was not snapping on anymore ,i don't know if that would make me lose speed and vibrate but...
if anyone has an idia please throw it out to me !
i also noticed my muffler when i had it off seems there is somthing moving longway,s in it like the hole guts,is that a suspect?

[speedracer]

Your spark plug cover looks suspect to me. It needs to be tight as you will lose spark with a loose cover. You will certainly lose speed with a loose spark plug wire.