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  1. #11

    Join Date
    Sep 2007
    Location
    houston, tx
    Posts
    22

    comp

    lol 110 is a tick low my 01 1200r is running about 96 in cylinder#2 115 in cylinders #1-3 my plan is to run it till it goes out the its time for shortblock exchange


  2. #12

    Join Date
    Mar 2010
    Location
    Holland PA
    Posts
    239
    +1
    2
    you can buy a compression kit at sears there only 60 bucks. then insert it into the spark plug hole and crank the motor

  3. #13

    Join Date
    Mar 2010
    Location
    Holland PA
    Posts
    239
    +1
    2
    110 isn't to bad i know the 1300r has 120-125 lbs in each cylinder. 96 is a little low though

  4. #14
    I have a question about the Yamaha XL 1200. Does this model have a power valve? Why do I need to hold the throttle wide open? Do the remaining spark plugs need to be tighten down or can they be loose fitting? I ran a compression test and the readings are extremley low but the ski runs great. Only has 58 hours on it.

  5. #15
    agsbill's Avatar
    Join Date
    Jun 2010
    Location
    Gainesville, Ga.. Lake Lanier ....... 2006 FXHO Cruiser
    Posts
    270
    Quote Originally Posted by 2fast4u View Post
    When testing compression : Cold engine: Be sure your battery is good and fully charged to max befor testing, Remove all 3 plug wires and store them safely away from the engine area and be sure there is no gas or fumes in hull, remove only on sprakplug at a time ( leave the other two in when testing ) Un plug electrical power valve servo motor, be sure power valves are closed, hold throttle full open when testing, record gauge reading, repete test again on same cyl. just to get a good reading, then do the same on the other two cyls. If you battery seams to slow down during testing re charge battery between each cyl. test , This is the only way to do a good compression test IMO, Tommy Jordan
    Is that the elec connection just below the steering column inside the hull? The one near the two cables?

    What difference does it make to have 2 of 3 plugs installed? The reason I ask is say..your compression is 100-100-150.
    If you check #1 it will be turning against 250
    If you check #2 it will be turning against 250
    If you check #3 it will only be against 200.....

    Bill

  6. #16

    Join Date
    Aug 2010
    Location
    Willis, TX
    Posts
    10
    Thanks for the detailed info on this

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