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  • #1

    Two Strokes

    i have a jlo rockwell 400 cc in my attex, i'm pretty sure its the 399 LR but the problem is i don't know anything about two strokes. i'm pretty familiar with four strokes but no idea about the two strokes. i'm getting close to putting the engine back into my attex i've been restoring and see if it runs. when i bought it the guy said it ran a few years back, so i'm sure it's been sitting for quite a while. i thought about buying a manual for it since i havn't been able to find one for it online but don't want to buy the manual if the engine is no good. my question is, is there anything i need to check before i hook everything up and try to fire it up? i know you can't run then without an exhaust but other than that dk what else mechanically i need to do to it before turning it over....also the dash sticker said to mix the fuel 20:1, is this the correct fuel to two stroke oil mixture ratio?

    Thanks
    Nate
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  • #2
    get some good modern Synthetic oil, i use Spectro Oils of America - 2 Stroke Engine Oils and mix it at 40:1. it is almost smokeless once the engine gets up to temp.

    you'll probably need to clean/ rebuild the carb. most people don't take any care to run them dry before parking a machine and the fuel in the bowl turns to varnish. you also want to check for spark and compression before you drop the engine in. remove the spark plugs and spray some penetrating oil or engine fogging oil in each cylinder before you turn it over. i also spray some in the intake. turn the crank by hand a few turns to feel for any binding. then put a spark tester on one of the wires... ground the tester and spin the engine over... then repeat for the other side. my jlo had great spark at first (after sitting 15+ years) but the part of the points that runs on the flywheel cam to actuate the points wore out really fast. i could adjust them and they would be out of spec again in no time. i replaced the points and haven't had the issue again.
    A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

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    • #3
      On the points thing.....you may want to save yourself the trouble of doing it later.....clean the points with very fine paper (like greater than 400) and clean with solvent (I use lacquer thinner), then set the point gap. There is also a pc of felt that lubes the contact between the crank cam and points....wet it with light machine oil.

      That attex should go like hell with the 400 in it!!

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      • #4
        I would also add that if the engine is already out with an older engine I would replace the crank seals. It may be a bit of a pain but not as bad as having to pull the engine again because the old seals are dry rotted cracked or leak.
        "Don't worry my Dad's a TV repairman, he has an excellent set of tools..I can fix It"

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        • #5
          ok, well i have the carb off and took to lower bowl off when i first took it out. the card had some varnish where the filter mounts to it and the bowl was full of varnish. i have them both soaking in the parts washer right now. i also have the fuel pump as well cause im sure it's full of varnish too, anyways thanks for a starting point before i put it back in and any other suggests are welcome as well. i would like to know what the compression should be though? because i can turn it over by hand pretty easily....but you can tell that there's some pressure there as well.....

          Thanks
          Nate

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          • #6
            Originally posted by nate52 View Post
            ok, well i have the carb off and took to lower bowl off when i first took it out. the card had some varnish where the filter mounts to it and the bowl was full of varnish. i have them both soaking in the parts washer right now. i also have the fuel pump as well cause im sure it's full of varnish too, anyways thanks for a starting point before i put it back in and any other suggests are welcome as well. i would like to know what the compression should be though? because i can turn it over by hand pretty easily....but you can tell that there's some pressure there as well.....



            Thanks
            Nate
            compression can be a lot lower if the cylinder walls/ pistons are really dry (like an engine that has sat for a long time) ... get some oil in there and see if it hasn't improved. not sure on compression 155 sticks in my head but i could be wrong. check it, if one is way lower than the other that would be a good indication of a problem
            A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

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            • #7
              ok, thanks racerone3 i appreciate the help.

              Nate

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