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  1. #1
    Matrix 200 suparoo's Avatar
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    How much can I plane off my Matrix Head ?

    I was doing a wash check on the Matrix on the weekend and saw some moisture in the cylinder so decided to pull the head off.
    The O rings were in pretty bad shape with a bit off corrosion in the bottom of the oring grooves, which I carefully removed with a scraper and vacum cleaner. But the head has some pitting as well which I think needs to be deal with.
    My plan is to get the head skimmed in the mill and have it re-anodized. The question is how much can it safely be milled down. It has 150psi compression with 3 cylinder base gaskets.
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  2. #2
    PolarisNut's Avatar
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    What is your squish clearance with the current setup? It looks like you only have a little step left from the squish band to the edge of the head, so you can't go past that without re-cutting your squish band. I can't see it taking more than .005" to clean that corrosion up, which won't change your compression by much...maybe 5psi. Also, before you have the head re-annodized, knock the sharp edges around the cooling passages down with a dremel, so the coating is less likely to fail there again.

  3. #3
    Matrix 200 suparoo's Avatar
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    I will put the head back on and measure it.
    Im thinking I should look at sending the head away and have the thing recut anyway as its always had an issue with pump gas and this might be a good time to sort it out. Who would be the best people to send it to, to have it recut into a good shape.

    I see a guy

    Lowell & Emelie Horning
    2-Stroke-Porting
    2565 Caribbean Drive
    Lake Havasu City, AZ 86406

    advertising. Would this be a good option ?

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by suparoo View Post
    ...Who would be the best people to send it to, to have it recut into a good shape...
    If you are going to be shipping the heads to the USA, I would be calling Randy at Watcon or Jay at Sharps Marine

    Contact info for both can be found through my signature links, under Parts Sources.

  5. #5
    PolarisNut's Avatar
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    Lowell's work is immaculate, and his 2 stroke knowledge is amazing...but he doesn't do heads anymore...I thought Randy was done with 2 stroke stuff? Most triple pipe skis out there need a light mix of race gas. My triple Virage and my SL1050 both needed a little race gas when running compression that high. Problem is, if you take out too much compression, the motor starts to get a little sluggish down low, and you lose that "hit" that makes triple pipe boats so much fun. I'd give Jay a call. He's a straight shooter, and he'll tell you exactly what you need to do.

  6. #6

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    If you call Jay you might check into one of there heads that way you can get interchangable domes

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