[Hinton_Est94]

I have a 2012 Honda 420 rancher 4x4 it was smoking really bad so I replaced the rings valves valve springs and seats put a new thermostat and all new top end gaskets, adjusted valves to specs and crunk it and now it's still smoking really bad when you give it gas it's a white smoke! Please help guys! Thanks

 

[SamUK]

Did you clean the exhaust out after the rebuild? Have you monitored oil levels since it’s first start up post rebuild?

 

[Hinton_Est94]

Yes I cleaned it out and I've had people tell me that it will smoke a little because it's burning all the old gunk out but it shouldn't be smoking like it is. Doesn't smoke idling soon as you hit the gas it starts smoking like a fog machine until you let off the gas it's a white smoke like a coolant problem. Could it be a bad water pump or something

 

[ktriebol]

If it's smoking heavily with white smoke, you are on the right track by investigating the coolant. Moisture in the exhaust system will cause white smoke too, but that goes away after too long. It seems the best thing to do for starters is to run a pressure test on the cooling system to see if it leaks down. Also monitor coolant level. If this confirms a loss of coolant, which is making its way to the combustion chamber, then you need to find out where the leak is coming from.

If you knew the problem was due to burning water because of the white smoke, then all the work you did with rings, valves, and seats was for nothing. I'm sorry to hear about that, but it is best to test and evaluate up front.

 

[Hinton_Est94]

Appreciate the help. The rings and valves had to be done they was burnt up bad and they white smoke just started after rebuild. Thank so for the advice guys!

 

[fishfiles]

so from reading your posted you replaced the rings , did you have the jug mic'ed ( checked for sizing and roundness ) , you made no mention of a new jug or bore job , mostly if you went back with the same piston and jug , then that is your problem ---G+H does a good job at a good price for machine work and parts to do a upper job , you can't beat them