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Thread: Bravo Compression

  1. #1
    Junior Member Mini
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    Default Bravo Compression

    So now that I've got my little bravo starting, running and idling again (I also found a track for it!) I'm slowly going through it mechanically while we ride it around the property before I actually take it anywhere.

    I put a compression tester on it the other night and I see I'm getting just under 120lbs of compression. Now, I'm way less familiar with 2 stroke motors compared to 4 strokes, but is this considered low?

    A set of rings and top end gaskets for this thing are super cheap so I don't mind doing a top end overhaul but I don't want to waste my time if that kind of compression is considered fine.

  2. #2
    Senior Member Mod Vincent's Avatar
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    Default

    120 psi is excellent!!!! I wouldn't touch the motor with numbers like that!

    Generally 100 psi or less indicates time for a rebuild.
    Last edited by Vincent; 02-11-2020 at 10:08 AM.
    2000 Venture 700

    -Head gasket thinned
    -Stainless reed stoppers notched
    -Cobra 1.35 x 136" track
    -Home made transfer rod
    -Boss Seat
    -Apex helix, 8ch weights, +2.8g per tip, wpw spring, 8dn belt, green sec @ 70
    -22-39 gears with reverse
    -Rox 3" risers
    -Plastic skis
    -Drilled can
    -Electric start system and ring gear removed.
    -LED headlight and tale light

  3. #3
    Junior Member Mini
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    Default

    Good to know! I had no idea what I should have been looking for, I have literally never compression tested an air-cooled 2 stroke and being a single lung, it's not like I could compare two cylinders! I knew high performance liquid sleds are usually above 130psi somewhere and dirt bikes can get as high as 150-170 so I thought it might be low, but wasn't really sure.

    She seems to be running great and starts perfectly, as Bravo's tend to do.

    I might take the clutches apart and check them out, it feels a little weird when accelerating sometimes, hard to describe but they could probably use a good cleaning anyways!

  4. #4
    Senior Member Mod Vincent's Avatar
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    Dude these are 20 hp air cooled tractors. There's nothing remotely comparable to high performance liquid cooled dirt bike engines....lol


    Yes, go threw your Clutches, very likely the need a good cleaning and maybe a few parts.
    Last edited by Vincent; 02-11-2020 at 12:55 PM.
    2000 Venture 700

    -Head gasket thinned
    -Stainless reed stoppers notched
    -Cobra 1.35 x 136" track
    -Home made transfer rod
    -Boss Seat
    -Apex helix, 8ch weights, +2.8g per tip, wpw spring, 8dn belt, green sec @ 70
    -22-39 gears with reverse
    -Rox 3" risers
    -Plastic skis
    -Drilled can
    -Electric start system and ring gear removed.
    -LED headlight and tale light

  5. #5
    Junior Member Mini
    Join Date
    Jan 2020
    Location
    Ontario, Canada
    Posts
    16


    Default

    Lol, thats why I figured I should reach out and see what I should be looking for because you are right, if there is the snowmobile equivelent of a tractor, the Bravo certainly fits the bill.

    I also might be one of those people who has a habit of taking rebuild/repair projects far, far further than any rational person.

    I'll inspect those clutches and see how they look!

  6. #6
    Senior Member Stock
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    Jan 2018
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    Saskatchewan
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    Welcome to the "too far club."

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