ANYONE THAT IS RUNNING THE MIKUNI FUEL PUMP ON A 950....

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by D-man, Oct 20, 2016.

  1. D-man

    D-man SALLGOOD

    Joined:
    Sep 20, 2006
    Oddometer:
    950
    Location:
    Spud country, SE IDAHO
    probably a good Idea, shouldn't need it, not that sharp of a bend but I think I will do it anyway. I replaced the hose with one that is stiffer too.
    #21
  2. MultiDoc

    MultiDoc Been here awhile

    Joined:
    Mar 26, 2016
    Oddometer:
    282
    Location:
    Wales, UK
    Thanks for the link! Unfortunately they have every rebuild kit for all Mikuni pumps... except the one I need.

    Anyone has any of source? Otherwise the only (silly) alternative would be to buy the whole pump as a spare.
    #22
  3. twobarb

    twobarb Adventurer

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    90
    Location:
    Wheat Ridge CO, Garden City KS
    Go to sudco.com and look in their catalog (click on the catalog image, it's kinda confusing ) if it's in there hit up a local shop, most have an account with sudco.


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    #23
  4. twobarb

    twobarb Adventurer

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    Which pump is raid using? I just assumed it was the DF52-73.


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    #24
  5. MultiDoc

    MultiDoc Been here awhile

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    It's the DF52-136. Emailed them and asked if they have a rebuild kit I could get through them. Dave from Raid Designs responded just earlier and seems they d have it.
    #25
  6. Corsica101

    Corsica101 Been here awhile

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    Jan 5, 2013
    Oddometer:
    572
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    Valencia
    [​IMG]
    This is how I got it setup, runs fine!



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    #26
  7. SE Steve

    SE Steve Super Noob

    Joined:
    May 18, 2011
    Oddometer:
    329
    Location:
    So Cal
    I installed the Raid pump on my bike after the stock pump crapped out. Worked great forgot to turn the fuel taps off on a trip with the bike in the back of my truck. Flooded the engine. Ran into a problem with the pump vapor locking in high temperatures over 100 degrees. Rebuilt my stock pump with the dr bean kit no problems since.
    #27
  8. veetwo _tls

    veetwo _tls RENOVATIO:

    Joined:
    Nov 14, 2005
    Oddometer:
    2,554
    Location:
    THE MALLEE OUT BUSH
    Back when i had the CV carbs & airbox
    Never had a problem since with fueling

    [​IMG]
    [​IMG]
    [​IMG]


    Inline tap & filter setup With the FCR's Now

    [​IMG]
    [​IMG]

    [​IMG]
    [​IMG]
    #28
  9. beemer boy

    beemer boy Oh no, he's gone Asian

    Joined:
    Jul 18, 2003
    Oddometer:
    895
    Location:
    Southern Oregon
    The original pump was crap as everyone knows by now. The facet pump is a bit
    better. But the real solution, which everyone should use , is to put in a
    Carter solenoid electric pump. Cost is about 45 bucks, dead silent, and worked perfectly on all
    the bikes I put it on. Three Africa Twins and a KTM 950. It actually slips into
    the exact same stock rubber mount.

    http://www.jegs.com/i/Carter/180/P7...9WD85ejiqw-sBfT7nhvlLUkBmUiG6AloaApW3EALw_wcB

    [​IMG]
    #29
  10. veetwo _tls

    veetwo _tls RENOVATIO:

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    I ran the mikuni vacuum pump since late 2007 i NEVER had a problem with it & it's one less electrical problem to deal with & it's fixable if had too replace a gasket on side road or out middle of Australia. electrics worth shit compared to mechanical pumps here out bush
    #30
  11. Zuber

    Zuber Zoob

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    Main Street, Oregon
    The Carter pump looks good, but output is 6-9 psi. That's way too high, you'd have to add a fuel pressure regulator and set it down to 3-4 psi. It may work on the highway, but it would probably stall out if you hit a jump.
    #31
  12. darkstarmoto

    darkstarmoto Am I evil? Yes I am

    Joined:
    May 24, 2009
    Oddometer:
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    Location:
    SEPA
    Check out Winderosa Fuel Pump Repair Kit 45145, Amazon has them for $4.85. Supposed to be the right one for the DF52-136.
    #32
  13. beemer boy

    beemer boy Oh no, he's gone Asian

    Joined:
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    Oddometer:
    895
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    Southern Oregon
    Carter makes models of this pump with different pressures . I just looked up the link quickly so this may not be the exact one. I installed these pumps on my KTM 950, as well as the Africa Twins. They worked flawlessly on all the bikes .
    #33
  14. Zuber

    Zuber Zoob

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    #34
  15. Zuber

    Zuber Zoob

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    A couple of odd vacuum pump installs -

    I worked on an old KTM LC4 single that had a vacuum pump. It was producing too much pressure for this worn out carb, not normal for these pumps. Someone had lowered the pressure by running a line from the pump output back to the input. There was a Tee from this line to the carb. So, it pumped in a circle with just enough left over pressure to feed the carb.

    The early Husabergs had an odd shaped tank that extended below the carb on one side, the other side ended above the carb. The carb was gravity fed from the upper side of the tank and a vacuum pump pulled from the low side and re-filled the upper side. Don't know why they didn't just feed the carb directly?

    When these systems run out of fuel, it can take a lot of engine cranking to prime them again. Unless the pump is gravity fed below the fuel level.
    #35
  16. Bearded Hooligan

    Bearded Hooligan Moto Addict

    Joined:
    Mar 30, 2004
    Oddometer:
    959
    Location:
    Flat, Hot & Humid South GA

    This is what I am using for the last 10k miles. Mine stock pump with the DR. Beans kit died on a 6 week /14k mile trip at about the 5k mile mark, in the middle of nowhere. Found this pump at a Napa and installed, been there since. Picked up a spare in Fairbanks before making the run to Prudhoe Bay as insurance, its still in the box, now on my work bench. Simple, available just about anywhere and has been reliable so far.
    #36
    beemer boy likes this.
  17. Corsica101

    Corsica101 Been here awhile

    Joined:
    Jan 5, 2013
    Oddometer:
    572
    Location:
    Valencia
    Had a Mikuni pump and used it for the MDC '17. Got airlocked every time the fuel started boiling in the Morrocon heat. Not good in a rally! this one been working fine so far

    IMG_6938.jpg IMG_6939.jpg
    #37
  18. bigborett

    bigborett Hipster

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    Ok, I have read most of the stuff on fuel pumps and am looking at swapping to a vacuum pump. I like the ultra reliability and easy fixibility.

    Now here's the thing there seem to be a couple of inherent problems with Mikuni options. Namely, over pressure and siphoning leading to hydraulic lock.

    I've found this Dellorto pump which is run on some karts and Sherco bikes.
    [​IMG]

    https://sharkshifter.com/zc/index.php?main_page=product_info&products_id=1388

    It is a little more expensive than the Mikuni but has an inbuilt 0.1 bar(about 1.5psi) pressure relief valve so no need for a regulator, it also has internal one way valves so siphoning should not be an issue. It runs at 55lph, way more than required but should not be an issue with internal regulator.
    Those couple of problems with the Mikuni should be null and void.

    What do you think?

    P.S. I don't want to hear about Dr Beans or other electric options.
    #38
    veetwo _tls likes this.
  19. syky27

    syky27 Adventurer

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    Jun 6, 2017
    Oddometer:
    56
    Location:
    Vancouver BC or Prague Czech republic

    Hi, do you by any chance have a picture of the bracket you made? I just bought the same pump and I am figuring out how I should mount it....

    Thanks
    #39