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A little help with a 2n


 
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stretch5881
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Joined: 09 Jul 2019
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PostPosted: Tue Jul 09, 2019 4:29 am    Post subject: A little help with a 2n Reply to specific post Reply with quote

Howdy all,
A buddy has a 2N that ran really great all winter. He started it up a week ago and it's blowing blue smoke from the exhaust and the breather. It's also rattling in the valve area. I did a compression check and found #2 cylinder was down to 40# compression. The other 3 are close to 120.
The engine will puff smoke each time there is a rattle. This does not happen every revolution, maybe 3/4's of the time.
I figured a sticky valve. I soaked that cylinder with 50/50 atf and lacquer thinner for 3 days while bumpng the motor over twice each day.
I fired it up last night and no change.

On the plus side, I have no mosquitoes now.

Could it be something other than a sticky valve?
 
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Den N Ms
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PostPosted: Tue Jul 09, 2019 4:37 am    Post subject: Re: A little help with a 2n Reply to specific post Reply with quote

stretch5881,Remove the side valve covers for a look,It could have a broken /disconnected vals spring.
 
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teddy52food
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PostPosted: Tue Jul 09, 2019 6:03 am    Post subject: Re: A little help with a 2n Reply to specific post Reply with quote

Broken sleeve.
 
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stretch5881
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PostPosted: Tue Jul 09, 2019 1:52 pm    Post subject: Re: A little help with a 2n Reply to specific post Reply with quote

An old fellow told me to have a little patience. Today the cylinder was up to 60#. So, I gave it more atf and rolled it over a few
times. Now wait some more. If it don't improve, then the side cover comes off.
 
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stretch5881
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PostPosted: Mon Jul 15, 2019 8:04 am    Post subject: Re: A little help with a 2n Reply to specific post Reply with quote

Mystery narrowed down. Compression didn't raise any further. I pulled the side cover and everything looks ok. I put 10# air in the
cylinder with the valves closed. No leakage into the exhaust or intake. Piston or rings or sleeve are the culprit. I'll have to
talk to the buddy to see if he wants me to tear it down.
 
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