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New to CV carb, so....you know

Discussion in 'CVP Stage 1 Tuners Kit' started by jsbridgew, Dec 15, 2011.

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  1. jsbridgew

    jsbridgew New Member

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    hey folks,

    been working on a 91 springer for almost exactly 1 year, and it's finally finished

    one of the things i did was remove the CV carb and install the 'CV Performance Stage 1 Tuners kit'

    ...followed directions meticulously, as this is the kind of person i am

    anyway, came time to firing her up.... turned on fuel, pulled out enrichener and fired her up... and she purrs...BUT... as it slowly warms, it dies... and will only start with enrichener out... will not start with enrichener pressed all the way in

    adjusted mixture with the enclosed EZ screw....seated it, and backed out 1 3/4....but damn, can't keep the bike running

    oh, and used the 46 idle and 185 main.....bike has stage 1 air cleaner and VH 2 to 1 pipe on her

    other mods include head work, Andrews 27 cam, and 10:1 compression

    anyone offer any advice or help so i can get her running?

    paul
    jsbridgew, Dec 15, 2011
    #1
  3. kenfuzed

    kenfuzed Administrator Staff Member

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    I would check fuel delivery to start with. If the bike sat a while there could be debris and varnish clogging the fuel petcock and screen. This would explain why the bike starts initially but then slowly dies as fuel is used from the bowl perhaps faster than it. To test you could shut off the petcock valve the moment the bike dies, then remove the bowl to see if it is full or near empty. If near empty then it is a delivery problem.

    If that all checks out you could take a look at the idle circuit for clogs. Remove the pilot jet and mixture screw (including the mixture packing - o-ring washer spring). Then blow compressed air into the pilot jet passage. You could use carburetor cleaner as long as you are VERY careful not to let any get on the slide diaphragm or into the accelerator pump diaphragm. The tiniest clog in the idle circuit can cause the bike to not idle, but if you rev the engine it should stay running. If the bike dies when accelerated above idle then the problem is likely still fuel delivery.
    kenfuzed, Dec 15, 2011
    #2
  4. jsbridgew

    jsbridgew New Member

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    Will indeed check fuel delivery, Ken.... but also want to add that initially, the air cleaner was soaked with fuel...but i suspect that had something to do with trying to start it by throttling it to death

    ...but as far as the main and idle jets used, they should be fine for my setup, right?
    jsbridgew, Dec 15, 2011
    #3
  5. kenfuzed

    kenfuzed Administrator Staff Member

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    Yes, your jetting should be just fine.

    Also with the fuel soaking the air cleaner it could mean that the float needle (plunger) is sticking.
    kenfuzed, Dec 15, 2011
    #4
  6. jsbridgew

    jsbridgew New Member

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    you've gotta pardon my ignorance on carbs, ken....but.... how would i recitfy the float needle (plunger) sticking?
    jsbridgew, Dec 15, 2011
    #5
  7. jsbridgew

    jsbridgew New Member

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    okay...just removed the float bowl, and it's full of fuel....so doesn't appear to be a fuel delivery problem

    i'm wondering if i should pull the carb...recheck everything....blow passages and adjust floats?
    jsbridgew, Dec 16, 2011
    #6
  8. kenfuzed

    kenfuzed Administrator Staff Member

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    Yes I would pull the carb and clean out the passages. Especially if the carb had previously sat for an extended period of time.

    The float needle (plunger, looks like the image below) can be removed/replaced by driving out the pin that secures the float. Be gentle when removing the pin since doing so in the wrong direction can break the cast bosses that hold the pin and permanently damage the carburetor. Your factory service manual describes how to replace the float needle valve.
    Float needle valve:
    [​IMG]

    Float level setting:
    [​IMG]

    Also make sure the Needle Jet (stainless steel nozzle) is facing the correct direction if it happened to come out during the instal process.
    [​IMG]

    [​IMG]

    One last thing to verify, check that the seal between the carburetor, manifold boot, and manifold is snug. The slightest vacuum leak where these meet will cause a multitude of problems. In fact check for vacuum leaks before everything else as this may save you extra work.
    kenfuzed, Dec 16, 2011
    #7
  9. cowboy

    cowboy Moderator Staff Member

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    I would start by checking for leaks before taking the carb off & apart again , like ken said just a small leak will cause big problems
    cowboy, Dec 16, 2011
    #8
  10. jsbridgew

    jsbridgew New Member

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    took the accelerator pump apart and diaphragm was complete garbage.... sediment all over it and in the seat...got a new diaphragm and o-ring...gonna blow it all out
    jsbridgew, Dec 16, 2011
    #9
  11. kenfuzed

    kenfuzed Administrator Staff Member

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    Ah yes, well where there is smoke there is fire. A good cleaning should flush out anymore junk and debris that might be clogging passages.
    kenfuzed, Dec 16, 2011
    #10
  12. cowboy

    cowboy Moderator Staff Member

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    Sounds like your trouble are fixed
    cowboy, Dec 16, 2011
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  13. jsbridgew

    jsbridgew New Member

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    well, i can't imagine what else it could be....i tore this carb apart and rechecked and double checked everything...BUT, when i pulled that pump apart it was ugly

    so bought a new diaphragm and o-ring and blew out every orifice i could find

    gonna get her back together tomorrow and will update!.... knock on wood
    jsbridgew, Dec 16, 2011
    #12
  14. cowboy

    cowboy Moderator Staff Member

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    How dirty is the inside of your tank ?
    cowboy, Dec 16, 2011
    #13
  15. jsbridgew

    jsbridgew New Member

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    that's a good point, cowboy..... i'm definitely putting that on my list of things to do, today, in addition to reinstalling the carb

    the tanks are coming off and i'm gonna flush them good.... guy who painted them said he blew them out nice and good, but you never know how much of a good job someone else really did
    jsbridgew, Dec 17, 2011
    #14
  16. JohnnyBiker

    JohnnyBiker Well-Known Member

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    I have flushed my tanks before and I used kerosene to do it, works really well.
    JohnnyBiker, Dec 17, 2011
    #15
  17. jsbridgew

    jsbridgew New Member

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    thanks, johnny.... just fill them up a bit, slosh it around, and empty them?
    jsbridgew, Dec 17, 2011
    #16
  18. cowboy

    cowboy Moderator Staff Member

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    Sounds Iike you know how to do it :)
    cowboy, Dec 17, 2011
    #17
  19. JohnnyBiker

    JohnnyBiker Well-Known Member

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    I even threw a light dog chain in it so when I sloshed the kerosene around the chain knocked against the walls to bust even more loose. Yep, basic idea, you got it..:cool:
    JohnnyBiker, Dec 17, 2011
    #18
  20. jsbridgew

    jsbridgew New Member

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    In those pics above, is that just the emulsion tube with the needle jet on the end?
    jsbridgew, Dec 18, 2011
    #19
  21. JohnnyBiker

    JohnnyBiker Well-Known Member

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    Yep, that is what the needle sits in. :cool:
    JohnnyBiker, Dec 18, 2011
    #20
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