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Thread: Enticer 250 Keihin carb - really tough start

  1. #1
    Junior Member Mini
    Join Date
    Oct 2006
    My Sled
    1978 Yamaha ET250
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    New York
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    Default Enticer 250 Keihin carb - really tough start

    I have been trying for 4 years to get this sled right. it is a 1978 enticer 250 with the Keihin carb. This machine just will not start. I can get it to start if I take the plug out and put some mixed gas down the cylinder. I need to do this 2 times before it will run. Once running it is perfect and will restart every time until it sits for an hour or more. Then nothing. I have rebuilt the carb (2 years ago), cleaned it a million times, adjusted the bolt on the bottom to 5 1/4 turns out. Checked the choke which is free and seated properly. checked the throttle cable which has 1/8 inch of free play, replaced all fuel, oil and pulse lines. I just don't know what to do. I'm about to put a ball type primer in the fuel line to see if that will help. Does anyone have any other ideas? I would really appreciate any help I can get.

  2. #2
    Senior Member Mod sandmanmike1's Avatar
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    Nov 2004
    My Sled
    94 VMAX 600 ST
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    Wyandotte MI
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    Default

    I would check to see if the screw on the bottom of the bowl is still on. They are known to fall out and are next too impossible to find.
    94 VMAX 600 ST with following mods
    96 XT 600 single GYT pipe
    96 XT 600 Carbs
    96 XT 600 Secondary
    Polaris P-85 primary
    2000 Venture 600 Pro-Action skid.
    2" Handle bar Riser
    Handlebar mounted GPS
    108 studs.
    Viper skis
    New track soon i hope

    1978 Enticer 250 B with Mikuni carb set-up

  3. #3
    Junior Member Mini
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    Oct 2006
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    1978 Yamaha ET250
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    New York
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    Default

    it's there, set at 5 1/4 turns out and the lock nut is secured and the fuel level is right on. it runs great through the the entire range. no bogging or hesitation at any RPM. it just won't start.

    edit: I noticed you have the mikuni carb setup. If I can't get this right I will problably go that way. Did you do it or was it already done?

  4. #4
    Senior Member ProStock SpartaSXr's Avatar
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    May 2003
    My Sled
    06 Attak
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    Western Michigan
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    Default 250

    Yup we had the same problem with the same sled and year. We bypassed the fuel level thing and put a squeeze ball in it. now it just needs choke to start when cold and runs great, it's fast for a 250 single !
    Ski-don't, Polaris won't, Arctic can't

  5. #5
    Junior Member Mini
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    Oct 2006
    My Sled
    1978 Yamaha ET250
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    New York
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    Default

    Thanks SpartaSXr I bought the primer bulb after I posted my question. I read through my post and there really is nothing else to do except try the primer bulb. Thanks for the reply. I've never been able to get it right, but they are a blast when they run.

  6. #6
    Junior Member Mini
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    Oct 2006
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    1978 Yamaha ET250
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    New York
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    I just finished putting in the primer bulb. pumped it a few times. pulled the choke and then the starter rope. it was running before the rope was half way out on the first pull. Thanks for the help. I'm so happy right now.

  7. #7
    Junior Member Mini
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    Feb 2009
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    '02 viper
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    michigan
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    throw it away and put on a mikuni 34mm, 280 main, 50 pilot, and 1.5 needle and seat thats what i did for both of my kids' 79 and 81 250's you will need to add a fuel pump a different throttle cable, i also put on a filter and no air box i'll repost on what size needle and jet tube not sure off the top of my head they start on 2-3 pulls and run great good lck

  8. #8
    Darn Tootin' Ding's Avatar
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    May 2003
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    Can't Remember
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    Howell, MI
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    Default Et250

    Tell me more about your carb swap on the ET250's.
    Ring the Bell, Win a Prize . . . Ding!!! . . . . . . I smell good !!! . . . No you Don't !!!
    Get outta my head, VOICE . . . Get outta my head . . .

  9. #9
    Junior Member Mini
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    Feb 2009
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    '02 viper
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    Default

    34 mm mikuni round slide
    280 main jet
    60 pilot jet
    1.5 needle and seat
    166q-2 jet tube
    2.0 or 2.5 slide
    6dh2 slide needle

  10. #10
    Junior Member Mini 06apexak's Avatar
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    2006 Apex RTX
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    Willow, Alaska
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    Default

    did you just put the squeeze bulb down by where my oil tank used to be? right between the tank and carb right?

    Also is the tank connected to the upper spot on the carb and the lower one is connected to the motor (pulse line?)?

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