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Search results

  1. L

    GS750 engine noise at high rpm

    So unfortunately my 82 gs750 has started making a scary noise when it's revved past ~4k rpm. I took a couple videos of it that I'll post below. The tach cable had just broken so I replaced it and then noticed it making this noise. Thinking it had something to do with the new cable I took it off...
  2. L

    Bike stalls after 5 minutes

    So I figured out the problem, I had gas in the oil and it was vaporizing when hot and passing back into the combustion chambers and running rich. Changed the oil and the problem is completely gone. Rode for an hour Wednesday and ran perfect. Thanks for the comment though it was a perplexing...
  3. L

    Carb-airbox boots won't stay on?

    True lol. If they didn't want that then they shouldn't have made them so damn well! another little tip, I used my heat gun on its hottest setting but make sure to keep it moving so it doesn't heat up any one area too much, if it starts to turn shiny it's too hot.
  4. L

    Carb-airbox boots won't stay on?

    Yep exactly. It's really not a great design because there is zero support in the middle of this large plastic box. A couple of abutments in the middle would have prevented that, surprised the Japs didn't think of that they seem to think of everything else.
  5. L

    Carb-airbox boots won't stay on?

    Maybe this has been covered extensively here but thought I'd post. I noticed that the rubber boots that attach the air box to the rear of the carbs on my 82 gs750 wouldn't seat fully just from pushing the box forward. I could push them forward and try to tighten the clamps at the same time but...
  6. L

    Bike stalls after 5 minutes

    That's reassuring, yep I'll bet the crankcase is squeaky clean now lol. Changed the oil again yesterday and am going to take it for a ride today. Fingers crossed that its good to go now.
  7. L

    Bike stalls after 5 minutes

    Will do. I'll bench test it before I put it back on the tank
  8. L

    Bike stalls after 5 minutes

    Hmmm that sounds like the best option, install and forget it. I'll look into that thanks!
  9. L

    Bike stalls after 5 minutes

    I really like my petcock though, if I bring it over to your place can you polish it for me?
  10. L

    Bike stalls after 5 minutes

    Gotcha, I also heard that it was to stop fuel from flowing in case of an accident, kind of like an inertia switch in a car idea. Sounds like I'll have to pull out the petcock and try to get it to seal better by polishing like you said. I've never owned anything with a vacuum operated petcock...
  11. L

    Bike stalls after 5 minutes

    Well the gas that got into the crankcase was from before I had the petcock rebuilt and before I did the new float valves and orings. As far as I can tell I'm not getting any gas leakage since I did the float valves. With properly functioning float valves the bowl shouldn't overflow even if the...
  12. L

    Bike stalls after 5 minutes

    Well good news, it would appear that the bike is fixed! I was doing some research and a guy on a Yamaha forum mentioned how sometimes gas will leak past the rings and into the crankcase from leaky carbs, and will run fine at idle, then once the engine gets hot that gas in the crankcase will...
  13. L

    Bike stalls after 5 minutes

    Thanks for the reply, I've kept mine with the stock airboxes and didn't change any settings on the carb jetting. All that is past my pay grade, eventually I might go to pods but for now I just want it to run in its factory configuration.
  14. L

    Bike stalls after 5 minutes

    So I think I've ruled out the petcock/tank being the issue. I fashioned an auxiliary "tank" from a plastic bottle (just a bottle with a vent and a nipple) and disconnected the fuel line from the motorcycle tank while the engine was hot, right after it had stalled out. With the new "tank"...
  15. L

    Bike stalls after 5 minutes

    The pilot screws are easily accessible with the carbs installed in the bike just by taking the tank off so I figured I could mess with those later if necessary. Do you think that'd be a good thing to just do?
  16. L

    Bike stalls after 5 minutes

    Ok so I pulled the drain plugs for cyl 1 and 4 right as it died. Both seemed to have plenty of gas in them.
  17. L

    Bike stalls after 5 minutes

    You're correct that's what I did
  18. L

    Bike stalls after 5 minutes

    Yes I'd tend to agree as I've accidentally left a single plug wire unplugged before and it still ran, suprisingly well actually lol. I'm suspicious of the petcock also but I'd like to know how exactly it could be malfunctioning that could be causing this problem
  19. L

    Bike stalls after 5 minutes

    Right I didn't touch the pilot screws. I thought the problem was the float valves so with the pilot screws I didn't want to fix it if it wasn't broken. Also they're easy to get at with the carbs installed in the bike so I figured I could always do that later. I replaced the needles and seats. I...
  20. L

    Bike stalls after 5 minutes

    Ok will check the drain plugs. The petcock is the original one with a lever and 3 positions - reserve, on, and prime. I had it rebuild by a local repair shop a month or so ago. Yes I replaced the rubber plugs. Funny, the old ones were so petrified they'd fall right out yet it ran fine with them...
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