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Gas smell in oil

Discussion in 'XJ Technical Chat' started by Glen F., May 4, 2021.

  1. Mechanic1978

    Mechanic1978 Active Member

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    @hogfiddles, Im curious as to your service for rack builds.. do you place them on any bike to do any adjusting, or just set them to all their so called respective defaults?
     
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  2. Glen F.

    Glen F. Active Member

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  3. Glen F.

    Glen F. Active Member

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    I did the propane test with no increase of rpms
     
  4. Mechanic1978

    Mechanic1978 Active Member

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    ok, yes a spring is in there as well, the metal on the diaphram is just to keep the spring from rupturing it, resulting in longer life for the seal.

    then you have an internal possible cracked base, or the slides are still sticking...
    answer this for me... when you look into the carbs, how much light can you see past the fly's (throttle plates)
     
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  5. Glen F.

    Glen F. Active Member

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    I have benched synced before putting them on the bike. let the bike warm up and sync then color tune then sync again. I don't own any other bikes.
     
  6. Glen F.

    Glen F. Active Member

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    I didn't show the spring, but it's there.
     
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  7. Glen F.

    Glen F. Active Member

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    I used a paper clip in the middle of the bottom of #2,and adjusted 1 then 3 and4 with another paper clip the same diameter.
     
  8. Mechanic1978

    Mechanic1978 Active Member

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    Sorry I meant for your customers rack jobs.. but I see your answer, about not having all bikes.. therefore it would be impossible to do this for all racks you do.. thanks, was just curious.

    Edit: this was a question meant for @hogfiddles
     
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  9. Glen F.

    Glen F. Active Member

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    My dad was the mechanic, not me. 58 years young and still learning.
     
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  10. Mechanic1978

    Mechanic1978 Active Member

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    I always start out with a piece of papers thickness, and adjust up as needed to start, then start adjusting the 'Air mixture" screws.
     
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  11. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    I set them to initial settings. It is the responsibility of the owner to dual them in for their bike.
    I do not do the wet setting, either… That is something that the owner should learn how to do… Plus, many times a rack and sent back and it stays in the bag for a fairly lengthy period of time before a Bikes is ready to run again. I am not going to introduce gasoline into a carburetor rack, and then have it sit on A shelf for a long period of time and end up with dried gas residue inside. That totally defeats the purpose of having Them thoroughly cleaned and rebuilt.
     
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  12. Glen F.

    Glen F. Active Member

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    I had thought about using old credit cards, but the instructions from this site said to use a paper clip, so I did.
    Where else could I look for a vacuum leak?
     
  13. Mechanic1978

    Mechanic1978 Active Member

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    papers thickness is a visual of amount of light seen when holding rack up to lights. I dint put paper or anything in there. its all visual..
     
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  14. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    You can’t adjust 3 ( other than with the idle speed screw). 3 is the “guide”. Basically you set 3, then set 4, 2, and 1 to match. There’s a big of finess to that, but it takes me about 2 minutes to set the bench sync. The fastest I ever did it was 53 seconds. Bench syncing in NOT hard. I don’t use card stock, or paper clips. I use my eyes.

    this is ONLY for bench syncing, so the bike will be in a condition to start and run so you can get it warmed up to do a running sync. RUNNING sync is when you will dial in the carbs.
     
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  15. Glen F.

    Glen F. Active Member

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    So I should tighten them up just a bit since you are saying the light should be about paper thickness?
     
  16. Glen F.

    Glen F. Active Member

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    Ya but you deal with these all the time, and many more than I can imagine. All good, I'll reduce the light passage.
     
  17. Mechanic1978

    Mechanic1978 Active Member

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    you said your propane test passed, so it would almost have to be internal in carb...
     
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  18. Mechanic1978

    Mechanic1978 Active Member

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    Thats a starting point, which is likely closed off too much, but this is my method. I would rather start out too little open, and gradually increase it as needed, than to start with too much gap and have to adjust it lower while keeping track of its position while adjusting air mixture screws and mental noting thier positions as well.
     
  19. Mechanic1978

    Mechanic1978 Active Member

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    cylinder 1 fires first, so I (personally) set all 4 on a bench sync to a low papers thickness of visual light on throttle plates, install on bike, start and adjust 3 as needed to get to run, then I adjust cyl 1 first, then 4 and then 2. manupilating lower idle as necessary to keep rpm in range.

    (PDF) specs manual says 1200rpm factory, but I run the idle of my fathers 550 at 1100 rpm idle.
     
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  20. Glen F.

    Glen F. Active Member

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    I'm not sure where to go then. I replaced the throttle shaft seals with o rings that were recommended here. Maybe I should order new seals from Len.
     

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