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1999 Honda Foreman 400, White Smoke, Ticking

KX420Guy

By KX420Guy
in Honda ATV Forum

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KX420Guy Newbie

KX420Guy

Posted
Posted

Hey guys, Im new here but I recently Picked up a '99 Foreman 400 that apparently just had a top end rebuild. It blows white smoke like crazy and ticks/knocks and seems to follow the rpm's. I haven't done to much trouble shooting yet, It starts and runs like a champ and has good compression. I was just wondering if anyone has any suggestions as to where to go.

Oh ya the top end rebuild the guy did was according to him he honed the cylinder and replaced the piston and rings, my fear is an ovaled cylinder?

gaquad Apprentice

gaquad

Posted
Posted (edited)

(ticking) Someone put a new top end on a worn bottom end.

(Smoke) busted oil ring or bad valve seals and or guides.

Edited by gaquad
  • 7 years later...
JacobSlabach Mentor

JacobSlabach

Posted
Posted (edited)

Ticking can also be from unadjusted valves or worn rocker arms

sorry I know this is an old thread just thought I’d throw that in there if anyone (like me was looking for tips on rebuilding a foreman 400 motor)

Edited by JacobSlabach
Mech Grand Master

Mech

Posted
Posted

It sounds like a broken ring, but, if there's really heaps of smoke.. and I mean if it's just pouring out, and white not blue tinged.. change the oil. I've seen motors with the wrong sort of oil in them that run good, but just streamed white smoke out the back.. the whiteness of the smoke being the clue.  In those cases the motors had just had an oil change and it was easy to guess what it was. Changed the oil and they came right.  The noise could be caused by the oil detonating.

Doh... I really must start taking better notice of the dates.

Probably worth mentioning (now we are here), that in one of those cases, and suspected in the other, it was chain bar oil that had been put in by mistake..

  • Haha 1
  • 2 months later...

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