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Hitachi carb rebuild. Tips/Tricks?

Old 02-17-14, 12:42 PM
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Hitachi carb rebuild. Tips/Tricks?

Hey guys,

As my engine is nearing the 'build' phase, I am about to rebuild my carb.

This is a 76 Cosmo, 13B, Hitachi.

The engine is NOT getting a streetport, but the ports have been 'cleaned up', and the manifold has also been smoothed. The only other mods are road race header, and electronic ignition, no emissions.

Any tips and tricks you guys can give me while I'm rebuilding the carb? I have had great success rebuilding Nikki's, so I am not worried about that.

Going emissions delete, are there do dads I can strip from the Hitachi, like a Nikki?

Thanks!
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Old 02-17-14, 07:31 PM
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Hitachi is a lot easier than a nikki. Just draw a picture/ map on paper or a shoe box that you can either tape or poke through the pieces you pull off the carb. That's how I knew what pieces went where after I pulled the throttle plate/mid section and top out of the the carb dip bucket.
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Old 02-18-14, 04:54 PM
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Its rebuilt now. Pretty easy.

What I was looking for though, is info on whether people had done Nikki style tricks. Mechanical secondaries and such.
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Old 02-18-14, 05:40 PM
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Ditch the hitachi and run a nikki. You just need to redrill/tap new studs to the 13-B intake
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Old 02-18-14, 05:59 PM
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I was told a Nikki is too small.
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Old 02-18-14, 09:45 PM
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CA

Originally Posted by djmtsu View Post
Its rebuilt now. Pretty easy.

What I was looking for though, is info on whether people had done Nikki style tricks. Mechanical secondaries and such.
Oops, sorry mate I thought you were just looking for rebuild tips. Wackys right, guys have been ditching the hitachi for a nikki for decades. It's possible to use the stock 4 port manifold if you drill and tap it to the nikki pattern.
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Old 02-18-14, 10:00 PM
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My experience is that I could get more CFM from a modded Nikki than a Hitachi as the Nikki's Prim and Sec venturies were removable . Depending on the engine I would bore the secondary venturies like crazy and re-jet accordingly . The Hitachi I could only do the primaries and re-jet.
Both carbs are good and both can be changed to mechanical secondaries.
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Old 02-19-14, 07:05 AM
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Originally Posted by Redline-RX3 View Post
Both carbs are good and both can be changed to mechanical secondaries.
Show me!!
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Old 02-19-14, 02:53 PM
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Didnt work
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Old 02-19-14, 02:56 PM
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My 80s set-up. RX-2 carb and 76 13-B intake
Attached Thumbnails Hitachi carb rebuild.  Tips/Tricks?-dsc06315.jpeg  
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Old 02-19-14, 04:00 PM
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Originally Posted by Siraniko View Post
Didnt work
Posting pix didnt work lol
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