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CV upgrade complete

Discussion in 'Projects' started by Lugnut, Dec 26, 2014.

  1. Lugnut

    Lugnut Active Member

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    Received & installed CVP premium tuners kit along with Accel petcock, rebuild kit (stayed with the 4 sided float needle) & inlet elbow. Float level spot on & I have 10 gal of 100% gas to help dial in idle mix.
    Cranked right up. No air/fuel leaks @ temp. Not doing the dyno thing till I can locate a reputable operator so I'm doing the plug reading (6 new sets) which is no mystery to me. Been there, done that.
    Raining right now so I've done @ temp, mid RPM idle. 1st initial reading/behavior, lean. Fatten, smoother, shutdown & save the plugs for mid/high throttle chops underload.
    Will get back with some pics of progression.
  2. bambidee

    bambidee Active Member

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    You must have a really close seat, who is the old guy in the pic? lol But really nice looking kid. Can not recall your build but sounds like you have a clue. Reading plugs is an art but time consuming, and fuel is not to consistent factor unless you use THAT fuel only. Looking into purchasing an O2 reading kit with memory , anyone know of a accurate slip up the muffler probe kit for bikes? I do not want to hack the exhaust for a screw in O2 on a bike if not there all ready. It would be OK on street cars. Faster and better info = less wear and tear on equipment.
  3. Lugnut

    Lugnut Active Member

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    I've had one good day this week to do a throttle chop & it was spent @ work. Tomorrow is rain & the next day is the frozen stuff followed by more rain. SSHHeeesh! Somebody throw me a bone already!
    On the "reputable dyno operator" search, found one but he won't touch the carbureted bikes. Dyno Difference out of Dallas comes highly recommended in the "EFI universe". I have been pointed in the right direction towards another Dyno guy who is just as effective in the "carbureted universe". D&D is a mobile dyno but they won't be in my neck of the woods till March.
    Good luck on that muffler probe kit. Me thinks I shall look into the O2 reader myself. If I find a muffler probe I'll give you a shout.
    Last edited: Dec 30, 2014
  4. bambidee

    bambidee Active Member

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    It's like 18- 20 degrees out here now and a little snow. Wish I could ride to fine tune NOT dressed like a person on TV from Alaska. Scooter is resting in back room of the house, heated and loving life.
  5. Lugnut

    Lugnut Active Member

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    Ethanol free gas,89 oct. Slow acceleration & stuck it on 50 mph for 175 miles stopping twice to inspect plugs so as to make sure I wasn't "blow torching" the pistons. Not really satisfied with this, can be better. Got some more work to do. IMG_1443.JPG IMG_1443.JPG View attachment 9523 View attachment 9524

    Attached Files:

  6. bambidee

    bambidee Active Member

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    The plugs look a little on the safe/rich side, what was the mileage? Also do you think a conventional plug might show better? Were the plugs in for the cold start? Can you give us a little more info on the year and modifications on your scoot?
    Lucifer likes this.
  7. hotroadking

    hotroadking Super Moderator Staff Member

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    Reading plugs isn't easy with today's clean fuel. You need an exhaust analyzer to get it right


    Sent from my iPhone using Tapatalk
  8. Lugnut

    Lugnut Active Member

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    >175 miles @ 44 mpg.
    >I'm reconsidering the IR & go to a conventional plug(s) for this phase of tuning.
    >Cold start..yeah. Installed new @ driveway & drove 15/20 mins @ 30/35 mph till I reached hi way then stuck the throttle @ 50 mph for 175 miles.
    >Year & mods are in showcase.

    What you didn't see on the plugs was a darker fuel ring cuz I scrubbed the plugs so as to get a better look @ ground strap color change location & to see if that was glazing occurring on the ceramic(it wasn't thankfully)
    & to inspect base of ceramic. I agree with you, I'm running rich, too rich but safe. My fuel mileage sucks for 50mph. I expected high 40s/low 50s for mpg.
    Here's the current jetting.
    46- 2 7/8 turns out
    CVP emu tube with Vel needle.(premium kit) along with accel nozzle.
    190- high.
    Here's something that should enter into equation, The shrink porting & airstack/manifold that gives that excellent cylinder fill @ higher RPMs. It does have that "punch" @ the higher RPM that you can feel.
    Anyway, I used up all the ethanol free gas on that run & have to go across state line to get some more.
    I'm considering going 185 on high jet & duplicating "the run" next weekend.
    Welcome any thoughts on this.
  9. Lugnut

    Lugnut Active Member

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    I agree. It was a lot easier "back in the day"
    With my current setup, What AFR should I shoot for. I prefer torque over HP along with economy. Cold weather rider that prefers mountains over prairie.
    Me thinks I can hookup with a analyzer in about 2 weeks.
  10. hotroadking

    hotroadking Super Moderator Staff Member

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    A good tuners will be able to get it into the proper AFR range,

    If you want a bit more gas mileage drop the needle one notch (up on the needle, bringing it down so it comes on a bit later.)
  11. Lucifer

    Lucifer Well-Known Member

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    Nice Bike:cool:...Did you try a 45 pilot before you went to the 46??What cam is in it??
    I think good AFR's were in 13.5-13.8 range for best power/mileage is what I was told by some guys with the tools to measure it...so I googled to see if I remembered right....;)

    http://www.afrplus.com/AFRplus-unit-functionality.asp
    Last edited: Jan 20, 2015
  12. Lugnut

    Lugnut Active Member

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    Started off with 46 & still have it in.
    EV 27.
    This is where I'm crossing wires. At 50 mph (no tach) ,am I still deep in low circuit or am I in the middle of transition with needle & 46. High is 190. Would it be safe to "assume" that @ 50mph the 46 & needle are joined @ the hip equally?[/quote]
    Last edited by a moderator: Jan 20, 2015
  13. Lugnut

    Lugnut Active Member

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    This changing the encoding just to post replies is a real poke in the eye:rage:
  14. Lugnut

    Lugnut Active Member

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    Ran across this while doing some "homework". I think I answered my own question.:bookworm: jet-chart.jpg
  15. hotroadking

    hotroadking Super Moderator Staff Member

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  16. baggerpaul

    baggerpaul Well-Known Member

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    You gotta remember that tjat needle is going to come into play depending on how much vacum the motor starts to pull on the slide if its a healthy head set up it will bring it in very early ! The chart is only a guide to how it works .if your a big dude and a heavy bike you be on the needle pretty early.
  17. Lugnut

    Lugnut Active Member

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    My engine builder said the same thing now that you bring that up. It's a very healthy head set up complimented with a outstanding intake track. Thanks for jogging my memory on that. I'll definitely enter that as I brainstorm my next move. Thinking about doing 3 20 mile runs @ different throttle positions & reading plugs before I make a determination on the next move. If it were you, what 3 throttle positions/mph would you try? Using 100% gas, no ethanol @ 89 octane. I really don't want to enter WOT position into the equation, not yet.
    I'm not "gravity challenged"...Yet, but the bike put on 45/50 lbs on this last reinvention.
    Hope my questions are making sense here.:confused:
  18. bambidee

    bambidee Active Member

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    Just a think, you should tune to the fuel you will use/can find at the pump when riding, not to something you have to chase after, might make for a better end result.
  19. baggerpaul

    baggerpaul Well-Known Member

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    Lugnut looking at those plugs your not pig rich . Its a tad on the rich side.i would go to 2 rurns and ride again 1/4 throttle and pull the plugs 4 gear cruise .the air fuel screw controls the pilot .idle cruise area
  20. Lugnut

    Lugnut Active Member

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    10-4
    Sunday is sunny & 64 deg. I have exchanged the NGK IR plugs for 12 NGK 7634 so I have plenty of fresh plugs. Got a couple of straight & level roads/hwy's pick out that will accommodate the locked speeds I'll be going.
    Start in the morning & be home in time to burn a few burgers on the grill.
    I'll post some pics of the plugs & this time I won't scrub them.

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