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Thread: 10.25:1 piston in 200s.Will it be much harder to pullstart?

  1. #1
    Join Date
    Dec 2015
    Location
    Port Robinson
    --
    7

    10.25:1 piston in 200s.Will it be much harder to pullstart?

    I have a jug freshly bored and a 10.25:1 piston. Will it be hard to pull over?The de compression cable is missing from the pull starter.Also have a stock xr 200 carburetor. Would it be worth installing or would the engine lose torque?Any response appreciated

  2. #2
    Join Date
    Apr 2011
    Location
    Mexico
    --
    9,003
    Can’t speak on the carb, but replacing your decompression cable and making sure it works properly would be highly recommended. Makes a huge difference and your starter assembly and your arm will will thank you for it.
    It sucks to get old

  3. #3
    Join Date
    Jul 2005
    Location
    Manheim, PA
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    5,742
    I build one years ago no one could start it. Pull start low compression, kick start high compression

  4. #4
    Join Date
    Jul 2010
    Location
    Arkansas
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    2,196
    Will it be hard to pull over?

    It'll be harder than stock and even a stock eninge can rip the handle out of your hand when things aren't right.


    If too many parts are missing from the recoil assembly to economically get the automatic system working again, you could use a manual setup with a handlebar mounted lever. That's the same basic system many dirt bikes use. It's just a miniature lever mounted on the left side of the handlebar and a cable run to the decomp lever on the head.

    There are advantages to using a manual decomp instead of auto, like being able to hold the exhaust valve open to more easily clear a flooded engine, and if it hasn't been started in a while just holding it open and spinning the engine over a few easy times to splash some oil around before starting and clear out the cylinder.


    Having any type of decompression mechanism slows wear on the recoil parts too. Even if you can start it, it's still better to have a functional decomp.
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  5. #5
    Join Date
    Nov 2019
    Location
    Florida
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    1,044
    I have read that there is very minimal HP gains from a high compression piston, you may be better off, with some porting and exhaust work.
    Just a suggestion.
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  6. #6
    Join Date
    Apr 2014
    Location
    Edmond, KS
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    2,531
    The XR200 carb would depend on how you ride it. When I put one on my AutoX, all I did was swap over the jets. I could feel a small loss of low end power and a slightly bigger gain in high RPM power. It felt like it revs out farther/longer.

  7. #7
    Join Date
    Apr 2019
    Location
    South Dakota
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    248
    I have dealt with an engine built nearly identical to what you described. started easy! it's now got a 12.5 to 1 piston and a super aggressive cam, just utilize the decompression system.
    Currently : trx400fw, ct70, 250es,200x, xl80s, 350x, 350x, 225DX, trx300

  8. #8
    Join Date
    Mar 2007
    Location
    Texas
    --
    5,046
    you can use the decom lever off a 185 on the head assembly. it slides right in and BAM you got a manual lever to start it. next, the compression is not that much more than stock. stock is 9:1 on that motor. so not a lot of difference. you should be fine. i would use a new rope on the pull start.
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