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Thread: Hemi head

  1. #41
    ole4's Avatar
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    No compression height is distance from top of wrist pin hole to top of piston. Hemi piston is .020 shorter than non hemi piston.
    Ole

  2. #42
    JBeasty's Avatar
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    Great I wonder if I increased my compression at all...

  3. #43
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    After thinking about it (I need to think more, post less...), I realized the +0.020 rod makes me even, and with the stock dished piston, the recessed portion is 0.050 lower than the flat top. So I did gain some compression.
    Last edited by JBeasty; 02-15-2018 at 02:36 PM.

  4. #44
    Senior Member DeadPixel's Avatar
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    Part # 212FTPISTON570 from NR Racing will put your piston back up it's about $17 and is a flat top. It comes with the rings. Make sure you run the correct rings with the piston you use. There is I believe 3 different ring sets for the predator.

  5. #45
    Senior Member DeadPixel's Avatar
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    If you do swap the piston the top and second ring are the same on the predator. 550 and dished piston but the oil ring is different. The predator .570 flat top uses different rings on all 3.

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  7. #46
    JBeasty's Avatar
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    Thanks, good to know. Fortunately, my piston came with all the rings. I'm gonna leave it as is for now and see how it runs. It's all buttoned up and ready to start. All I need to do is get some oil in it, rig up a temporary gas tank, and cross my fingers

  8. #47
    JBeasty's Avatar
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    Started on 4th pull. A few putts with the choke on, then took choke off and it fired right up. No adjustments to the carb other than a 1/2 turn on the idle adjustment screw. Seams to run really well. Idles fine and revs up quickly. Hi-tech test stand:

  9. #48
    Senior Member DeadPixel's Avatar
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    Nice good to see things went well.

  10. #49
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    Took it out for a test run today. Good God, I'm glad I didn't shoot for more power. This thing wheelies without trying, and is faster than I'm comfortable going - at least til I get used to riding it. I'm used to the weight and stability of motorcycles. This thing is squirrely!

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  12. #50
    Senior Member DeadPixel's Avatar
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    Lol before I got in to mini bikes my goal was to build a bike that would do 60. My new goal is 40. I have only had mine up to 28 so far. They definitely feel different than motorcycles. The sketches thing for me about these things is only having a back brake. I would feel a lot better at high speed if I knew I could stop in a reasonable distance. A lot funner than any ATV in my opinion though. I could have got a nice dirt bike or quad but have this instead.

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