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Rochester 2g Float

Discussion in 'Early CJ5 and CJ6 Tech' started by Renegade ll, Nov 8, 2016.

  1. Nov 8, 2016
    Renegade ll

    Renegade ll Member

    Thayne Wyoming
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    I am wondering what you guy's set your float at on your 2G carbs. I sent mine in to be rebuilt and they set the float at 3/4". It's running rich. Your thoughts?
     
  2. Nov 8, 2016
    Focker

    Focker That's a terrible idea...What time? Staff Member

    WA
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    3/4"? I don't even see that listed?

    [​IMG]
     
  3. Nov 8, 2016
    montanacj

    montanacj Member

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    Try to set it at the level on the chart and see what happens.
     
  4. Nov 8, 2016
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    cordele, Ga.
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    Are you using the brass/copper float?
     
  5. Nov 8, 2016
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    While I agree 3/4 seems like an unusual float level (assuming that is what you mean and not float drop), is the richness more due to the size of the jets? Even if the float is set too high, will that cause richness even if the jets are correct? Given that you live at pretty high elevation, using a small jet size will be important. All that being said, I am in the process of rebuilding mine so kind of interested to see how this works for you.

    Focker - did you set yours at 1-5/32" for a 1971 (same as Julius)? I intend to go with that for mine, although 1970 isn't directly listed and I don't have exact model number.
     
  6. Nov 8, 2016
    Renegade ll

    Renegade ll Member

    Thayne Wyoming
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    I am about to check the jet size and set the float to the chart. I will let you all know what the results are. Is there only one or 2 jets? The float is a diff. material than brass or copper. It is more like a plastic with a seam in it.
     
    Last edited: Nov 8, 2016
  7. Nov 8, 2016
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
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    There are 2 jets in the carb. Float adjustment will make it run rich or lean it some, mostly dependent with altitude. When running the 2G before there were many times I had to play with the float to keep it running good depending how high I was on the trails. Wish I could be more specific, but I think I flushed those brain cells with a good bottle of 12 year old Irish Whiskey...

    Just like the jets, I would argue it takes time and fiddling to get both the float and jets right on the 2G. Once you figure it out, they can be great. But remember, there is a reason the 4BBL and FI came along too.
     
  8. Nov 8, 2016
    Focker

    Focker That's a terrible idea...What time? Staff Member

    WA
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    My carb's # is 7041185 and I set it exactly to the specs listed. It runs great.
     
  9. Nov 8, 2016
    colojeepguy

    colojeepguy Colorado Springs

    At the foot of...
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    Altitude has a direct effect on float level...I always set my carbs up a little bit on the low side (6K elevation here).
    As chuck mentioned, that can be a trial and error process when you are four wheeling.
     
  10. Nov 8, 2016
    Focker

    Focker That's a terrible idea...What time? Staff Member

    WA
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    Yeah.

    I'm at 550'.
     
  11. Nov 8, 2016
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    The 2 jets screw out easily with a flathead screw driver - many have the jet size stamped on them. Roughly speaking, standard low elevation would be 51. 5000 ft would be 49 and for 10,000 ft a 47. I have been running 49s in mine here in denver at 5000'. It definitely likes to run a little rich. When I finish the rebuild, I will put new 49s back in to get it running and set float etc. But I also ordered a set of 48s to try out and see - I rarely go below 5000' and spend most of my time wheeling in the mts at 8000' plus. Moab is the only place I go that is a bit lower at 4000'. The biggest concern is there are two things to adjust (jet size and float height), so be careful about changing both at the same time too much as it will be difficult to get it dialed in...I intend to start with float at spec and adjust jet size first. Then I can fiddle with float a bit if needed or when changing elevation significantly.
     
  12. Nov 8, 2016
    Focker

    Focker That's a terrible idea...What time? Staff Member

    WA
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  13. Nov 8, 2016
    Renegade ll

    Renegade ll Member

    Thayne Wyoming
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    Here is something I had not noticed before. 2 Holes in the intake that are covered up by carb gasket. Are those holes supposed to be covered by the gasket? It looks like exhaust carbon on the gasket. What do you think?
     
  14. Nov 9, 2016
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    cordele, Ga.
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    The exhaust is ported up through the throttle base assembly to aid in cold start conditions. Blocking off those ports with the gasket is pretty standard in areas that don't live in very cold climate. I always block mine but I live in the South East.
     
  15. Nov 9, 2016
    Renegade ll

    Renegade ll Member

    Thayne Wyoming
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    I live in very cold Wyoming.
     
  16. Nov 9, 2016
    Renegade ll

    Renegade ll Member

    Thayne Wyoming
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    Thanks to 47v6 I purchased a fuel pressure/vac tester from HF. So this is what I found, about 6lbs fuel pressure. Both jets are 51's I will probably go down to 49's do to my altitude. Maybe it won't run so rich after I adjusted the float level also. 1-5/32" float level and 1-7/8" float drop. Thanks guy's for all your input.

    Julius
     
    Last edited: Nov 9, 2016
    FinoCJ likes this.
  17. Nov 9, 2016
    Renegade ll

    Renegade ll Member

    Thayne Wyoming
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    James we have similar driving altitudes. I'll let you know how mine runs after I done messing with it.
     
    FinoCJ likes this.
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