andrsn Posted April 8, 2015 Share Posted April 8, 2015 Looking for a little help from members that are familiar working on the Hitachi carbs. Got an 1983 Brat GL. Can't find the Hitachi serial number on the carb, but the rebuild kit I bought seems to match more or less. If someone can tell me where to find the model number I might be able to find a more correct diagram and solve all this myself! I have 4 parts that I cannot figure out where they came from, woops! I've been studying the exploded diagram that came with the rebuild kit, but I don't see them listed anywhere. I see the nylon ball listed in the diagram and that is in place but I don’t see a steel one anywhere? Parts in Question: I made a note where I believe the long needle pictured above goes: I also don't see how the long narrow spring clips onto the shaft that I drew a star around. Anyone know? there is a little hole in the shaft, does the end of the spring where its bent need to stick through that? doesn't seem right... thanks to anyone who can answer this. or if people have more carb diagrams somewhere? I can't find many online that are different than the one i have at home... Quote Link to comment Share on other sites More sharing options...
Sapper 157 Posted April 8, 2015 Share Posted April 8, 2015 1# goes exactly where you think it goes 1 Quote Link to comment Share on other sites More sharing options...
Sapper 157 Posted April 8, 2015 Share Posted April 8, 2015 (edited) You have the star portion of the picture wrong. The spring is upside down. once when you put the top of the carb on and put the rubber boot over the top of the accelerator pump (number 10 on diagram), then number 82 in the diagram gets fitted into the hole at the top of the accelerator pump. Im not really sure I recognize those other springs and that ball. Let me check my other diagrams. Edited April 8, 2015 by Sapper 157 Quote Link to comment Share on other sites More sharing options...
Sapper 157 Posted April 8, 2015 Share Posted April 8, 2015 Does this diagram help? 1 Quote Link to comment Share on other sites More sharing options...
Gloyale Posted April 10, 2015 Share Posted April 10, 2015 Spring with star around is upside down. The curved part is to hold the ball at the bottom from bouncing up. #1 goes in the hole you think. #2 not sure. Was it in the carb or part of the kit? #3. Steel replacement for nylon ball # 4. Could be from inside the choke pull off diaphragm? 1 Quote Link to comment Share on other sites More sharing options...
andrsn Posted April 11, 2015 Author Share Posted April 11, 2015 OK, #1 is resolved. to the best of my knowledge parts 2,3,4 came off of the carburetor during dis-assembly (I hadn't opened the rebuild packages until i had the carburetor taken apart/cleaned). I think 2,3 came out when I detached the throttle chamber. Pictured below are the mating surfaces that were separated when my mystery parts appeared (to the best of my recollection). There is only one hole that the ball bearing and spring will even fit in. The hole is threaded, but the screw that bolts these two parts together has a hole through it (part #40 in the diagram Sapper 157 posted above). I haven't seen anything in any diagram I've found with these parts though! anyone seen this before??? #4 I still don't know about, it looks like it came from a choke diaphragm as Gloyale stated, I'll see if it fits there. Is there supposed to be a large spring in there? Quote Link to comment Share on other sites More sharing options...
Sapper 157 Posted April 12, 2015 Share Posted April 12, 2015 Is there supposed to be a large spring in there? Yes. Quote Link to comment Share on other sites More sharing options...
andrsn Posted April 13, 2015 Author Share Posted April 13, 2015 figure it out. all the parts game from the diaphragm assembly attached to the carb. None of the diagrams I had or found online illustrated this, below there is another model Hitachi that does illustrate the mystery pieces (part C and part #17): thanks so much for everyone who replied. Quote Link to comment Share on other sites More sharing options...
Sapper 157 Posted April 13, 2015 Share Posted April 13, 2015 Woohooo!! Glad you figured it out! Those hitachis are darn complicated but if you can get them tuned right then they are very reliable. To quote Loyale 2.7 Turbo: "Fuel injection is a science, carburation is an art!" Quote Link to comment Share on other sites More sharing options...
andrsn Posted April 24, 2015 Author Share Posted April 24, 2015 Just wanted to say thanks to everyone who responded. Got the carb back on, somehow figured out where all the vacuum lines went and the brat fired up after a battery charge and a few turns of the engine. Haven't figured out if it solved the dying at stop signs issue, but i'll start another thread if it still isn't fixed. thanks 1 Quote Link to comment Share on other sites More sharing options...
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