Help! smoking badly! - Ford Bronco Forum
 
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post #1 of 8 (permalink) Old 05-01-2010, 01:07 AM Thread Starter
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Help! smoking badly!

well it isnt a bronco but it has a 4 stroke ice so i figured symptoms are the same. ill give the whole story. i have a 2006 350 honda rancher. for the longest time we were only riding it at the mud bog. well one day we went out trail riding on a hot day with some neigbors. when we got home it sat for a long time. when we started it back up it was smoking really badly. we ran it one more time at the mud bog before deciding to do the top end. we took down the top end and had our friend look at the cylender. part of the cylender wall was "scortched", it had a burn mark, was completely smooth and had oil leaking past. he said it was from overheating. must have been right cause shortly thereafter while washing it down (it hadnt been run yet) i discoverd the radiator completely caked over with mud. we replaced the rings and head gasket and had the cylender honed. when we fired it up it smoked until the excess oil burned off the inside of the muffler. after that it would occasionally puff some white smoke. well its slowly gotten worse. its a year later now. it was stored for a while and lately it wouldnt idle so i tore apart the carb and it had a buch of dirtlike crap stuck in the bottom of it. i cleaned it and put it back on and it runs now, although it runs like crap cause i dont have a tach to adjust the pilot jet yet. i recently had put some seafoam in it too. well now its smoking just as bad as when it first started smoking.i think the seafoam may have loosend the carbon and scratched the cylender wall. we will be doing the top end again but i want to do it so that it will not smoke at ALL afterwards. im thinking i should have the cylender bored out and larger rings installed. where would i get these? aslo what would symptoms of leaking valve seals be? i looked in the intake side when i had the carb off and the intake valve is covered in this nasty gunk. i also plan to lap the valves while i have the head off. is it possible that a warped cylender would cause this?

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post #2 of 8 (permalink) Old 05-01-2010, 01:12 AM
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When my uncle overheated his 400 rancher AT, they had to bore the engine out and fit a larger piston in... the engine got so hot the head actually warped....



I'd strip the thing down and clean it... Sounds to me the deeper you keep digging the more gunk you keep finding

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post #3 of 8 (permalink) Old 05-01-2010, 01:33 AM Thread Starter
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When my uncle overheated his 400 rancher AT, they had to bore the engine out and fit a larger piston in... the engine got so hot the head actually warped....



I'd strip the thing down and clean it... Sounds to me the deeper you keep digging the more gunk you keep finding
the piston had a ton of solidified gunk the first time around. so you think it will need a bigger piston or can i just do bigger rings (whats the right way to do it?)

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post #4 of 8 (permalink) Old 05-01-2010, 02:26 AM
U jelly of my
 
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Quote:
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the piston had a ton of solidified gunk the first time around. so you think it will need a bigger piston or can i just do bigger rings (whats the right way to do it?)
depends on how bad the cylinder walls are....

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post #5 of 8 (permalink) Old 05-01-2010, 04:06 AM
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Sounds like a combo of overheat and ingesting some crap through the intake. I am no fan of additives either. I've seen some do serious harm, and haven't seen any give a real benefit.

Check out the forums on www.atvriders.com, too.

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post #6 of 8 (permalink) Old 05-01-2010, 10:18 AM Thread Starter
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well the carb definately ingested crap, i think its due to a lack of a fuel filter. it hasnt overheasted since then, it just has slowly gotten worse over time. i will i know what size to bore it out to?

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post #7 of 8 (permalink) Old 05-01-2010, 12:11 PM
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The best bet would be to take it to a machine shop to mic the cylinder and they will tell you hhow much theyll have to take out. if its not a chrome sleeve.. if so then a new jug or replacement sleeve is in order. and after that work is done theyll measure it to order the right size piston and ring. hope that helps.



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post #8 of 8 (permalink) Old 05-03-2010, 01:23 PM Thread Starter
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anyone know what the symptoms of a bad valve guide are?

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