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  1. Colt Winchester

    Sparkplug Health

    Hey Everyone, I've been tuning my 72 750 for a little bit now and I'm very close to getting the needles right. My question is, based on the look of these plugs, should I move the needle position up one more time or are these good? Before the needles were one space lower and it was running very...
  2. Colt Winchester

    '72 Carb Tuning

    I'm in the middle of trying to tune these carbs. I've pulled them off three times now. I'm about two tests away from pulling them again.
  3. Colt Winchester

    '72 Carb Tuning

    I almost don't want to tell you guys what the problem was... I pulled all the spark plugs to look at then and it was running a bit rich, but noticed #1 looked like it wasn't firing... I wiggled the wire and the plastic cap popped off... I screwed it back in, plugged everything back up and that...
  4. Colt Winchester

    '72 Carb Tuning

    Yes. All new brass. When it still gave me trouble, I swapped for another carb that was fine and got the same result.
  5. Colt Winchester

    '72 Carb Tuning

    Someone else mentioned that... I just figured that wouldn't be my issue since I've swapped multiple needles and float and still have the issue.
  6. Colt Winchester

    '72 Carb Tuning

    I have digital copies. There should be any crud on it because all the brass is new and I dismantled each carb and ultrasonically cleaned them.
  7. Colt Winchester

    '72 Carb Tuning

    Yes. The battery was completely drained. I rode it for an hour, pulled it into the garage and it was dead. It's almost like the altenator isn't charging the bike completely. I also thought that, so I swapped in a never used original Honda float that we got and it did the same thing. All the...
  8. Colt Winchester

    '72 Carb Tuning

    I did some looking and found one potential issue. My floats were all over the place. A buddy whose been a Honda Mechanic for the past 40 years came by with some old guage tools and helped me set the float and I swapped the retainer down one position from stock (second from the bottom). After we...
  9. Colt Winchester

    '72 Carb Tuning

    Hey Everyone! I wanted to get everyone's opinion on a couple things. I've got a 72 CB750 that I've been working on. I've been working on carbs. I've got all the basics, cam, points, valves and timing adjusted. It's important to note that we're running a 4into1 exhaust and pod filters. We got an...
  10. Colt Winchester

    Rear End Spacer

    Hey Everyone, I'm rebuilding the rear end of my 71 CB750 and I noticed when I was taking the rear axle out a spacer of some kind fell out. I'm not exactly sure where this goes, but it doesn't have any grease on it and all my inner spacers seem to be accounted for. Does anyone know where this...
  11. Colt Winchester

    Carb Lines

    Does this apply to the SOHC carbs on a 71? I see it mentions that it's for the DOHC bikes of the later years.
  12. Colt Winchester

    Carb Lines

    I took a look around the forum and only found one about ultrasonic cleaning. I'm most concerned with tuning them back after cleaning and getting them set properly.
  13. Colt Winchester

    Carb Lines

    I've got a full rebuild kit with all new needles and o-rings and gaskets. I was going to ultra sonically clean each carb before rebuilding.
  14. Colt Winchester

    Carb Lines

    Gotcha. So even with a full rebuild, I can expect some sticking every now and then?
  15. Colt Winchester

    Carb Lines

    That's a very good point. I plan on rebuilding the carbs fully so I hope that I have no overflow, but I figured in the event that it happens, I could let the bike cool down, then remove the hoses to diagnosis which carb is having the problems. I know very little about these bikes at the moment...
  16. Colt Winchester

    Carb Lines

    Since they're just over flow lines, have you seen anyone who ever built something to clean up the look under there? I was thinking it might be possible to connect all four to the same line and have a single line flow out the back instead of having four randomly hanging out back there. I'm...
  17. Colt Winchester

    Carb Lines

    Okay. I was going to (temporarily) tie them to the frame on the opposite side of the exhaust to have them drain out under the bike. I read somewhere that there should be two "vent" lines that also just end randomly. Is there anywhere specific I should place them?
  18. Colt Winchester

    Carb Lines

    You're absolutely right. I talk to a buddy of mine who builds these bikes and he said that it's commonly done as a way to get to engine without pulling it. He sent me a link to replacement pipes that I can weld in. They have links that bolt end to end so you can remove them when needed. This...
  19. Colt Winchester

    Carb Lines

    Well, to be completely honest... I have no idea. I just picked up this bike for a grand yesterday. I just started to dig into it. Ive never worked or owned a bike. Only classic cars. It's been sitting in a garage for a decade and has been driven about 50 miles each year. The guy just didn't have...
  20. Colt Winchester

    Carb Lines

    Hey Everyone! I am working on my '71 CB750 Four that I just bought and I have been trying to find information about these fuel lines. So far, that's proving to be very difficult. The two delivery hoses from the Petcock to the middle of carbs 1-2 and 3-4 were both hooked up. Where I'm getting...
  21. Colt Winchester

    New Project

    Hey Everyone! I just bought a 1971 CB750 Four. (New to motorcycles, so any history on these models would be greatly appreciated. I'm trying to learn all I can.) The bike ran, but the fuel lines are dry rotted so I can start the engine yet. I'm familiar with working on old cars and I'm wanting...
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