2 ?'s in one thread

[jeremy_283]

today some people said when i was jumping my quad in the air when i let off the throttle there was a puff of blue smoke repeatedly i stopped to talk to them and after that it never happened again.... is it anything to worry about? i just got a new piston 1 month ago..... and could the hotcam in my 400ex make the valves tick louder cuz they are very noticable even after i adjust them?

[400exMO]

The cam will make the valves louder. Just make sure and repeatedly check valve clearance at the spec. the cam needs.

Blue smoke frome a 4 stroke is normal but if blue smoke is come out repeatedly theirs somthing wrong

[rooster300ex]

Originally posted by Jason#19
Blue smoke frome a 4 stroke is normal but if blue smoke is come out repeatedly theirs somthing wrong


4 strokes don't puff out blue smoke normally. If a 4 stroke is smoking blue something is wrong, maybe nothing that keeps the motor from running right, but something is causing it to smoke.

[DieselBoy]

im thinkin' valve seals.

[400exrida06]

Originally posted by DieselBoy
im thinkin' valve seals.

Ya I think this is your problem because my quad was doing the same thing before i changed them, and just check around your heads to see if theres any oil because your quad may be burning it like mine was.

[jeremy_283]

but it never did it again

[jeremy_283]

it never smokes on start up or nothin so one person prolly thought they saw smake and the rest went along with it

[DieselBoy]

Unless you see it again I wouldn't lose any sleep over it.

[jeremy_283]

it only does it if it was reved up really high and it only does it for a sec so i am guessing it is blow by........ i do have a wiesco piston on it too

[DieselBoy]

Yeah, so your bore/rings are starting to get worn. Until it get's excessive you shouldn't worry...

[jeremy_283]

the new piston is only one month old