benjamachine Posted December 13, 2011 Share Posted December 13, 2011 Hey all, Now that I'm driving my Hitachi-carbureted EA82 at 8,500 feet above sea level most of the time, I've been advised to switch to a Weber. Unfortunately, I don't have the money for a Weber. What I DO have is an extra Hitachi that works pretty well. Is there anywhere I can pick up high altitude jets for an old Hitachi? I've looked around, but can only seem to find standard rebuild kits. I'm worried that I'll gum up my catalytic converters with the extra rich mixture (although it might be a little leaner since I've been running a straight through glasspack muffler). Thanks, Ben Link to comment Share on other sites More sharing options...
Quidam Posted December 13, 2011 Share Posted December 13, 2011 Hey all, Now that I'm driving my Hitachi-carbureted EA82 at 8,500 feet above sea level most of the time, I've been advised to switch to a Weber. Unfortunately, I don't have the money for a Weber. What I DO have is an extra Hitachi that works pretty well. Is there anywhere I can pick up high altitude jets for an old Hitachi? I've looked around, but can only seem to find standard rebuild kits. I'm worried that I'll gum up my catalytic converters with the extra rich mixture (although it might be a little leaner since I've been running a straight through glasspack muffler). Thanks, Ben Ben, What you might do is find some Hitachi jets from a smaller carb, ie EA 81, 71 etc if you can find someone that would part one out. The Hitachi, Weber, and others share a lot of the same threads on these but the seating can be different. I'm not sure what's what right now... For instance, I read and confirmed where the Hitachi/Weber powervalves share the same threads, but the seating is different. Wish I knew more right now about this, what jets fit what. Good luck, I think those smaller Hitachi jets will work for you if you can find some. Doug Link to comment Share on other sites More sharing options...
Dirk Posted December 16, 2011 Share Posted December 16, 2011 You could be naughty and advance the timing a wee bit. Depending on how rich you are running and how much advance you can take this could help. Maybe Doug can confirm or denounce my comments. Link to comment Share on other sites More sharing options...
TeamCF Posted December 16, 2011 Share Posted December 16, 2011 I've not seen any jet kits for the Hitachi. But I do know there were "high altitude kits" for them. At least for the EA81. I've seen it mentioned a few times in various shop manuals (and my owners manual). I would think good luck finding one though.... Link to comment Share on other sites More sharing options...
skishop69 Posted December 16, 2011 Share Posted December 16, 2011 Remove the primary and main jets from the carb. Get a set of pin drills and determine the current size of the jet. Write it down. Using silver solder and a small butane torch, solder the single hole (top or bottom) closed. Redrill the solder with the pin drill starting at .010" SMALLER than the original measurement. reassemble and drive making sure you have new plugs in so you can see the color after the drive. Also make sure to load it good (floored up a big hill or drive floored with the brake on a few times) to make sure you get a good color reading. Also listen for pinging. Any pinging, too lean. Remove the jet and redrill one size larger. The color on the plugs should be a nice tan. Anything lighter than tan is too lean. it's a pain, but it works. Link to comment Share on other sites More sharing options...
opus Posted December 16, 2011 Share Posted December 16, 2011 We used to crack a vacuum line to lean it out when going up high. Link to comment Share on other sites More sharing options...
benjamachine Posted December 16, 2011 Author Share Posted December 16, 2011 We used to crack a vacuum line to lean it out when going up high. ghetto!! Link to comment Share on other sites More sharing options...
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