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  #31  
Old 06-04-2012, 08:40 PM
Rales Rales is offline
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I also had issue with sticking valves on my 169. I was able to determine it was the valves sticking as after it quit, I would try to restart and the engine would spin over very easy as the valve or valves were stuck open. After about 10 mins it would cool and then start again with proper compression. I tried the MMO and it has helped. I now add it to my gas when I fill up. One day I need to take the engine out and ream the valve guide and also remove the balance gears before they vent my block. So much to do, so little time.
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  #32  
Old 06-05-2012, 06:32 PM
David a Calkins David a Calkins is offline
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Default sticking valve

first pull the valve cover off ,and see if is sticking ,by lifting the spring ,and do check the clearance ,.017-.019
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  #33  
Old 06-05-2012, 09:26 PM
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Matt G. Matt G. is offline
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I would also make sure that the timing is correct and it isn't running lean, as both of those will cause overheating, which can result in a sticky valve.
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  #34  
Old 06-12-2012, 10:46 PM
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ngilson ngilson is offline
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Default sticking valve

a fella at our local shop says to take a spray bottle of water and squirt it lightly into the carb it will help with the carbon build up on the vavle
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  #35  
Old 06-13-2012, 07:13 AM
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Quote:
Originally Posted by ngilson View Post
a fella at our local shop says to take a spray bottle of water and squirt it lightly into the carb it will help with the carbon build up on the vavle
That would help with carbon in the combustion chamber, but will do nothing for carbon on the valve stem.
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  #36  
Old 10-05-2012, 11:33 AM
Mike McKown Mike McKown is offline
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I haven't seen it posted here but using old, sour gasoline will cause the valves to stick too.
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  #37  
Old 10-06-2012, 10:06 PM
green 4 acres green 4 acres is offline
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Quote:
Originally Posted by Mike McKown View Post
I haven't seen it posted here but using old, sour gasoline will cause the valves to stick too.
Yes it sure will. In 02 I was working at a Kia dealer and gas had jumped to the insane price of $1.95 or some thing like that people were avoiding the higher price premium and it was getting rotten in tanks , something I still worry about. anyway a convienance store chain here bought fuel from these stores that couldn't sell it and trucked to the metro mixing it with the reg gas. At KIA we used this chain (intials were QT ) to put $12 of gas in a new car at pdi . a month later we had around 30 new cars that had no compression I told the manager it was a old fuel problem he didn't beleive it and wanted me to keep looking for the problem ,I called the factory reps and they straightened him out.
the manager and owner were furious at the store and were going to sue them. to dispose of the fuel was expensive $350 a car I had a old carburated1985 ram 50 PU that runs just fine on old gas i told the boss i would take the gas and use it they bought the barrels and payed me 2 hours a car to drain i used the steel tank gas buggy to transport home thats all i did for 10 days and used the 4 barrels of gas for 3-4 months. ... thought Id share
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  #38  
Old 10-08-2012, 12:49 AM
jdroison jdroison is offline
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Originally Posted by jdroison View Post
the lead in the gas did act as a lube on the valve guides, like in the IHC regular which ran on kero originally. the valve guides needed a mod when going to unleaded.
this was not because of unleaded, my dad had 2 regulars he ran in the 50s and early 60s on regular leaded gas, they had to have the guides trimmed to prevent sticking, had to do with the diff burning temps of the gas over the kero.

they are both running well still today.
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  #39  
Old 10-08-2012, 11:11 AM
jeff967 jeff967 is offline
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Quote:
Originally Posted by ngilson View Post
a fella at our local shop says to take a spray bottle of water and squirt it lightly into the carb it will help with the carbon build up on the vavle
works very good on steam cleaning pistons and bores before a planed rebuild
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