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  1. M

    80 XS400 high idle

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  2. M

    80 XS400 high idle

    pulled the carbs back off. getting pretty good at it. Looks like a previous owner lost the idle set screw and jammed that POS looking thing on there.
  3. M

    80 XS400 high idle

    what would you charge for a carb rebuild? Do you know if the 79 model carbs are the same as the 80? and what would you have to have for those? silly question, why do you only use the 360 carbs?
  4. M

    80 XS400 high idle

    no I didn't sync the carbs as I didn't think I could get correct results with whats going on. I did inspect the diaphragms and held a small light behind them looking for holes.
  5. M

    80 XS400 high idle

    Yes 3 full turns out. The 2 things that seem to have made any difference was the valve adjustment, much quieter and the needle seats, no longer flooding. I have not tried any more adjustments on the mixture screws
  6. M

    80 XS400 high idle

    I really appreciate all the help. I checked the valves and most were to tight with one intake valve that was very tight. I rolled the motor over several times and kept rechecking until I was happy with it. Bike has aftermarket intake manifolds that each have ports. Left capped off. Right feeds...
  7. M

    80 XS400 high idle

    I just went out and fired it up. Fires up good with the choke idles up then I push in the choke. it settled down and idled around 1500. I sprayed a full can of carb cleaner all around the throttle shafts, the crank case vent, intake port and fuel shutoff just for measure, head and base gasket...
  8. M

    80 XS400 high idle

    Im good with engines, reasonable with electrical. Its one thing when electrical gremlins get you but when something that operates on the same principles as a toilet bowl get you....Im no carb guy. I can clean up and setup a single carb to factory settings but with multi carbs meehh. I think with...
  9. M

    80 XS400 high idle

    I had suspected it could be but that it could be casting flashing also. Ill hit that area again with carb cleaner while running before removal. I went out and inspected further I don't think it cracked, it seem to scrape away with the finger nail.
  10. M

    80 XS400 high idle

    I think im going to send the carb out and have them rebuilt.
  11. M

    80 XS400 high idle

    I got my second needle set a few days ago and finally had time to install them. I then set the pilot screws to 3 turns out. First they helped as im no longer flooding out the bike and I can restart with no issues. BUT it still wants to take off on me but only when warmed up. I fired it up cold...
  12. M

    80 XS400 high idle

    installed some used bars (found them to be bent by the way) and bam the starter works. Then it didn't, wiggled the wiring and it works again. oh well the bucket is coming out anyway sooner or later and Ill have a better look at everting behind it. I got one float set, yea one and it was...
  13. M

    80 XS400 high idle

    Ordered Yamaha needle sets. Ill let you know how it turns out in a few days
  14. M

    80 XS400 high idle

    thank you. Im wondering if I need to remove these and the mixture screws and blow out those passages again. Are there o-rings that would need to be replaced if I do this?
  15. M

    80 XS400 high idle

    My yamaha manual states for the XS400G (I think i have the model right) float height should be set to 27.3 mm give or take 0.5 mm. Both look very close to 26mm . Seats look clean as well as the needle end but there a wear ring on the needle. I wonder if it's not sealing correctly there. Is it ok...
  16. M

    80 XS400 high idle

    None of my measuring devices have the correct metric readout LOL. Carbs are off the bike again so ill give them another look over and pay better attention to the needle and seats and try to put the floats in some water after checking the heights. Can the enrichment circuit plungers (choke) come...
  17. M

    80 XS400 high idle

    Tried restarting and found its flooding out. pulled the carbs for another cleaning. Thinking I may order new float needles to see if that cures it, Im not aware of it flooding out before and thinking after disturbing the float needles they may not be sealing. Do these brass floats go bad often...
  18. M

    80 XS400 high idle

    Finally got around to adjusting the valves, Ive done a lot of diesels, id rather do a rear engine bus any day than a bike lol. The valves where pretty tight with the right intake so tight I couldn't get a feeler gauge in there. noticed the cap (unused vacuum port)on the left intake manifold was...
  19. M

    80 XS400 high idle

    Good catch on the handle bars I do belive they are coated. I probably wouldn't have thought of that. the previous owner stated the electric start worked, at least intermittently until he changed the bars. I think he was wanting to make a scrambler style bike and put these endure style bars on it.
  20. M

    80 XS400 high idle

    is this what your talking about? or an assembly? https://www.ebay.com/itm/YAMAHA-XJ-XS-XV-XV750-XS1100-XS650-XS750-XJ650-XS400-STARTER-BUTTON-NEW/123703114764?hash=item1ccd47bc0c:g:8I0AAMXQvTlRgwLc
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