Home Forums Tech Talk Radiator cap?

This topic contains 7 replies, has 5 voices, and was last updated by  John Sweeney 4 years, 9 months ago.

  • Author
  • #21169

    John Sweeney

    New here, new to karts.  I recently came into a cr80 birel kart that needs some love.

    I’m pretty mechanically inclined, I’ve been taking my cars and dirtbike apart for a while, but I don’t have too much experience with radiator caps (aside from taking them off and putting them back on).

    My radiator cap is missing. For reference, I tried to fit the cap from my kx250 on there, no dice, from my lexus, too big, honda, too big. Went to the local motorcycle and 4wheeler store here and they can only look up parts by vehicle. Looked online, and since radiator caps are $20-30 I didn’t want to just order a few and see what fit.

    It is an all black radiator, nothing fancy. I’ll try and post some pics. I took some measurements. Inner diameter2 is taken at the point where the overflow tube hits the bowl.

    Inner diameter: 27mm

    Inner diameter2: 25.5mm

    Outer diameter: 44.75mm

    Bowl depth: 16mm


  • #21175

    tony zambos


    Start with going to a kart shop. If you can, bring the radiator with you.  The caps are pressurized with a fitting for an overflow line

    LAD Specialties customer / tony kart / rotax / kt100

  • #21176

    John Sweeney

    Thanks for the advice, I think he closest kart shop is a few hours away so I may be out of luck for a bit. If anyone has any other advice, I’d be glad to hear it. Maybe I can call a shop and get them to find me a cap long distance.

  • #21192

    Sanford Mitz

    My guess is Freeline. Check with a Birel dealer.

  • #21201

    Brian Degulis

    Try these guys with measurments   http://www.spikeradiators.com/



  • #21970

    Troy V Smith

    Looks like a large Freeline to me as well – it has the welded brackets in the back?


    We may not be the fastest on the track...but we're having the most fun!

  • #21974

    John Sweeney

    Awesome! Thanks guys, I just got off the phone with Ryen at Cambrian go karts and that’s what he said. One is one the way. I’ll post results.

  • #21170

    John Sweeney

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