Looking for some advice involving Krauser 4 valve heads

Discussion in 'Airheads' started by Myduffy, Nov 16, 2019.

  1. ccmickelson

    ccmickelson MonoMania Supporter

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    Wow, what a find. If you can't find any takers here there's a fairly active NM Airheads group and a number of members in Silver City. You might hit them up.
    #21
  2. Myduffy

    Myduffy n00b

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    That sounds interesting, any chance you have a link to that?
    #22
  3. bmwrench

    bmwrench Long timer

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    Two Krauser-headed bikes were entered at a race at Daytona "back in the day". They were impressively fast, but neither finished the race. The team claimed both bikes suffered gearbox failures, but...
    #23
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  4. El Matador

    El Matador Adventurer

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    Please check your inbox.
    #24
  5. scottyb

    scottyb Been here awhile

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    [​IMG]


    Built back in the day. Have a spare set of heads with cylinders. anyone interested?
    #25
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  6. Arktasian

    Arktasian Lets call it Naturalized

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    How does John communicate - on line or at the track? I've only encountered a couple of projects/ individuals that were open to discussing their craft with another squirter.
    #26
  7. Kiwiabbo

    Kiwiabbo Been here awhile

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    Check with David Hunn in one of the above comments. That’s the bike there but there was also a turbo, injected 90s aswell.
    #27
  8. tennessee thumper

    tennessee thumper Long timer Supporter

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    I'd be looking for a buyer on these, sell em off and fund other parts of your build.

    Neat find, nonetheless.
    #28
  9. wallaman

    wallaman Been here awhile

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    The Krauser heads are a great addition to an airhead! The only real downside is the addition of some weight to the valve train due to the addition of an "extra lifter" that fits in the head itself. (Stock lifter - new Krauser pushrod - new Krauser "lifter" - new Krauser rocker arm). That heavier valve train tends to be hard on stock cam and lifter contact surfaces, particularly at higher RPM. I don't recall who, but someone made a nice cam for this setup that had ramps that helped minimize this aggravation. Also, the Krauser lifters that ride in the heads had press fit "buttons" in the ends of the "lifter tube". These tend to leak and the lifters fill up with oil making them extra heavy. When (not if) this happens, the cam/stock lifter wear gets really bad eventually with catastrophic results. (I've never found a used set of these lifters that didn't have at least a little oil inside of them.) Easy fix is to silver solder the "buttons" into the tubes so they don't leak. That gives you a reliable top end that breathes well - a major improvement to stock based on the seat of my pants :) The Krauser pistons use Porsche rings that are readily available and can be had for chrome or cast iron barrels. And yes, the heads (even if not complete with all the other bits) are worth a LOT of money!
    #29
  10. gsd4me

    gsd4me 90% bluff Supporter

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    That would be Ray Peake, not John.
    #30
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  11. Kiwiabbo

    Kiwiabbo Been here awhile

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    Roger.... I knew it was one of those clever buggers
    #31