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If it ain't broke tweak it a little....
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259 Posts
Discussion Starter #1
How important is the check valve screen and what is the check valve function on the leaf plate of 1984 johnson 15.
 

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If it ain't broke tweak it a little....
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259 Posts
Discussion Starter #2
There is a picture here http://www.sschapterpsa.com/ramblings/OB%20images/reed_valves.jpg
 

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If it ain't broke tweak it a little....
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259 Posts
Discussion Starter #3
Scared to start this motor new rings, seals, thermostat, etc. installed don't want to mess anything up during break-in.
 

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Cert. Yamaha technician
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4,330 Posts
Buy a good aftermarket reed setup, they say they help top end, but they definately smooth idle
 

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> PRO STAFF <
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7,519 Posts
what is the check valve function
Going from memory, 20 plus years ago, I think that screen
and check valve are part of the oil scavenging system.
Pulls excess 2 stroke oil out of the bottom of the crankcase and back into use.
 

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If it ain't broke tweak it a little....
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259 Posts
Discussion Starter #6
Talked to a mechanic he thinks by design it is to keep fuel from pooling. He did not think it would harm motor to run without screen. Thanks for your reply.
 

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Brandon, FL
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10,689 Posts
I don't know the technical terms are but Brett is on track. What they do is to create a little bit of pressure and surface tension so the mix is delivered in a controlled manner and not spit through the hole.

Similar to the reason your house faucet have screens in them.
 
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