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Thread: Cool head dome ID

  1. 08-28-2018, 03:11 PM #1
    iwallace
    iwallace is offline First Time Rider Arm chair racerNew to the board
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    Cool head dome ID

    hiya. Could anyone tell me what size coolhead dome I have please. Tri z 250 . Brought when first came out. Just can't remember what I had planned for it. Thanks ianClick image for larger version.  Name: 15354840845975515131.jpg  Views: 16  Size: 1.83 MB  ID: 254217
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  2. 08-28-2018, 03:14 PM #2
    iwallace
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    For a tri z if it makes any difference
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  3. 08-28-2018, 04:05 PM #3
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    El Camexican
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    Not sure what this might tell you, but this is what a "Pump Gas" dome looks like. Sorry, no numbers, it's in use at the moment.

    Click image for larger version.  Name: Tri-Z%20Engine%20Build%20157[1].JPG  Views: 14  Size: 1.77 MB  ID: 254218
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  4. 08-28-2018, 04:10 PM #4
    iwallace
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    Cheers mate. Looks similar to me. But I can't remember what the others look like
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  5. 08-28-2018, 04:11 PM #5
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    christph
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    Measure the volume. Put a plug in it, top it off with water, and measure the volume. I have a Sprock head for my Z. I think he only made stock and 50/50 domes. The range is probably around 20 to 22cc.
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  6. 08-28-2018, 04:13 PM #6
    iwallace
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    If I'm remembering right. He made 3 different domes at the start
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  7. 08-28-2018, 04:28 PM #7
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    christph
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    Quote Originally Posted by iwallace View Post
    If I'm remembering right. He made 3 different domes at the start
    Yeah, but I think he had a problem with the full race dome, so that was a limited run. When I got mine the highest compression available was 50/50.
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  8. 08-28-2018, 04:38 PM #8
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    yaegerb
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    If its a sprock run race gas.
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  9. 08-28-2018, 07:53 PM #9
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    Tri-Z 250
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    I have had both the BigBore and stock bore domes relieved to allow for pump gas to run. This is on the advise of my motor builder to smooth down the hit and vibration related to the flat high compression of Sprocks domes.
    Last edited by Tri-Z 250; 08-28-2018 at 08:08 PM.
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  10. 08-28-2018, 10:03 PM #10
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    christph
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    I run 50/50 in mine, around 100 octane.
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  11. 08-29-2018, 08:18 AM #11
    iwallace
    iwallace is offline First Time Rider Arm chair racerNew to the board
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    Hi.just filled the dome with water.it measures 16ml on my syringe. I take it . It's not for pump gas.
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  12. 08-29-2018, 08:55 AM #12
    iwallace
    iwallace is offline First Time Rider Arm chair racerNew to the board
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    I only filled the inner dome piece. ..should I fill it to the first edge. Inner o ring....think I've answered my own question
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  13. 08-29-2018, 09:41 AM #13
    iwallace
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    I should of looked more closely befor I asked the question...just found a number stamped on it..25. Cheers for all your help anyway.ian
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  14. 09-09-2018, 06:04 AM #14
    iwallace
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    Quote Originally Posted by iwallace View Post
    I should of looked more closely befor I asked the question...just found a number stamped on it..25. Cheers for all your help anyway.ian
    Am i right thinking my 25cc dome wont be no good for my standard engine, also can i still buy the sprock domes anywhere ,if so what size should i go for.
    Willbe giving the engine a rebuild soon. Its still on its original piston and rings. Thanks ian
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  15. 09-09-2018, 07:36 AM #15
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    El Camexican
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    Try Off-road Innovations for any Sprock products you’re looking for. If anyone has parts it will be them.

    Do you have the stock head? Just shaving .020” or .030” of it might be your best option if you want to run pump gas.
    It sucks to get old
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