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MIKUNI 40PHH


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Why change the jets? Is the air/fuel ratio incorrect?

 

Put it on and drive it. I had 32mm on my A12 engine. It ran OK, excellent power. To make it run perfect, I suggest 29mm venturis. The jets should match the venturis, so if you tune the venturi size get new jets to match.

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  • 4 weeks later...
The vacum system
 
One carb has to pipes, another one has only one.
 
These are to link to the distribuitor vacum, im correct? Please inform how i link them
 
 
I will remove the srew on intake and i wil link to my brake servo
 
On the top of the carbs exist a system with a pulling spring, i think they are a choke system and i will link them with my car cable choke
 
Im correct?
 
 
Many thanks,
 
Luis  

 

 

http://s1305.photobucket.com/user/luiscolchetelui/media/DSC_0936_zpse3e8b469.jpg.html

 

http://s1305.photobucket.com/user/luiscolchetelui/media/DSC_0937_zpsb8255a2a.jpg.html

 

http://s1305.photobucket.com/user/luiscolchetelui/media/DSC_0938_zpsfdc1def8.jpg.html

 

http://s1305.photobucket.com/user/luiscolchetelui/media/DSC_0939_zpsda836f75.jpg.html

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Choke cables and the Starter choke are made to pull, not push.

 

Here is the factory Datsun twin choke cable, it is quite long

19289.jpg

They are not rare, as Datsun Roadster also used them.

BProjects sell them

New Datsun Parts sell them

 

I left mine disconnected. They are only needed when cold. I opened the bonnet and turned them 1/4" by hand.

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Sorry can you explain me better:

"Keep the carbon canister connected to ventilate the fuel tank".

 

The Original fuel pump its enough? becuase i learn Mikuni requires 3.5psi to carbs any time running.

it is very important to use fuel regurator?

 

Or i can run the carbs with my stock fuel pump and nothing more

 

 

 

Luis

 

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The fuel tank must be vented. Do not block the vent

 

 

My fuel tank is original, it has normal breathing system. and a normal gas cap. The fuel tank in original it is vented? It is correct what im sayng? 

 

What do you think?, i dont need nothing? neither buy high pressure pump neither regulator?. Just put the new  intake carbs on a standard fuel system and tune correct the carbs.

 

 

 

 

Many thanks for your help

 

Luis

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