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447 engine?

Discussion in 'The Garage' started by racerdave, Jul 4, 2011.

  1. racerdave

    racerdave ^ Gone not forgotten ^

    What is meant by this term? I did a search for 447 and nothing comes up.
    Last edited: Jul 4, 2011
  2. gggGary

    gggGary Stop that! Top Contributor XS650.com Supporter

    There are three general engine groups

    Paraphrased from some MikesXS engine items.

    256 1970-73
    447 (USA) & 533 type (European) engines - 1974-84
    I am not sure if Australia NZ got the 553s or 447s

    Note: 447 type Rings interchange with European 533 Rings but pistons do not.
    447 rings do not interchange with original 256 rings used on 1970-73 models.
    Last edited: Jul 4, 2011
  3. jayel

    jayel #9 Guru 74 TX650A

    just a engine model code, 70, 71's were 256 engines 72's were 306's 73's 366 74's begain the 447 series, but 3 basic types 256 447 533

    Attached Files:

  4. xstra

    xstra just a phase

    Three basic crankshafts.

    256-no e.start
    306-with e.start............Both these have conrods @ 135mm labelled 256

    447-with e.start............Conrods are 130mm labelled 447

    533-with e.start............Conrods are 140mm labelled 533

    Crankshafts are interchangeable as complete units only: Crank, rods and pistons
  5. sreimer

    sreimer XS650 Addict

    Quiz time. What characterisics will change when you change the rods lengths?
  6. racerdave

    racerdave ^ Gone not forgotten ^

  7. racerdave

    racerdave ^ Gone not forgotten ^

    Do I get a cookie?
  8. Patches

    Patches XS650 Junkie

    It has been said that the 256 motors should have more low end torque due to the longer connecting rods. Also, they have possibly stronger and larger pins. I believe 22mm instead of the 447 20 mm. All cranks are exchangeable but you need a matching cam due to different cam gear tooth numbers. A 447 crank needs a 447 cam and a 256 needs a 256. But you can exchange a 447 crank and cam for a 256 crank and cam if you are looking to run the 447 big bore kit in a 256 case. Also, the 256 and 447 cranks and cams use different pitch cam chains. Also, on a side note all jugs are interchangeable, but beware, the XS1 has an extra casting brace between cylinders that will not allow you to remove you the cam chain without separating (breaking it) it.

    553 motors were for Europe and other countries, but not for the US.

    Heads are interchangeable, but you should run the factory matching rocker box with it (apparently the are matched at the factory, but I have used a non matching rocker box and head in the past and didn't have problem The XS1 head has 4 triangular tappet covers, XS2 and some TX (if not all) have compression release on the one square tappet, and after that it is just a regular square cover, no compression release.

    Some of the advantages of the 447 is there are more aftermarket parts being that is was the most used motor, you can rephase it (I don't thing anyone is doing a 256 rephase (yet)), and there is a bolt on big bore kit for it. I have seen a bolt on big bore kit for the 256, but I don't believe it is available in the US (yet).

    Somebody please correct me if I'm wrong.

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