63 40 Hp Big Twin carb question

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Bollie

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Jun 4, 2005
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I striped and cleaned the carb, now it seems that i can not get the air ajuster set right.<br />When i remove the air needle screw completly the enjin starts to rev up, if i just stick it back in, the motor runs more even but when i turn it in - at the piont where the thread starts to catch the motor bogs down. Can the air passages still be blocked.
 
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Bollie

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Re: 63 40 Hp Big Twin carb question

I did went through the drill of turning it all the way in and back it one turn out. At that setting the enjin will barely run.
 
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lark2004

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Re: 63 40 Hp Big Twin carb question

what did you clean the carb with?<br /><br />and did you put a new kit into it? (new gaskets etc...)
 
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Bollie

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Re: 63 40 Hp Big Twin carb question

I used the carb cleaner in a spray can, i also just ordered a carb kit from NAPA. The problem i have now is the part number for the gaskets of the reed valve cover. The sales man at NAPA wants a part number and i can not find it online. Is there somebody that can help me with that even the original part number will help
 
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Paul Moir

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Nov 5, 2002
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Re: 63 40 Hp Big Twin carb question

OMC 311365, NAPA (Sierra) 18-1225 - gasket between the block and read plate<br />OMC 311364, NAPA (Sierra) 18-1228 - gasket between the reed plate and manifold.<br />(If you want for some reason, you can subsitute 311364 with 311365, but not the other way around!)<br /><br />Sierra has these gaskets lised as for a '40HP Commercial' but it fits 33hp, 28hp, 30hp, 35hp, and 40hp engines from the fifties and sixties.<br /><br />Hope this helps!<br /><br />PS - when rebuilding your carb with the new carb kit, be sure to remove the soft plug in the top so you can directly clean out the idle orifaces.
 
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Bollie

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Re: 63 40 Hp Big Twin carb question

Thank you sir that help a lot. My first experianse with boat enjins is not to woppie, i bought this motor that was supposed to be in good running order - turns out to be in no so good running order. It also slips out of gear on high speed, i swop the clutch dog and the forward and reverse gears around. i hope it will work like that.
 
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Bollie

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Jun 4, 2005
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Re: 63 40 Hp Big Twin carb question

My 14 year old son can not wait to get back on the water, he had his first taste of fishing from the boat and now i got a nagging kit on my hands as well.<br />thank you
 
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