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  1. No start

    02-03 R1 Mechanical Help
    Run the bike briefly with no airbox to see if the injectors are firing. If the issue is fuel you can start the bike with the air box removed from the throttle bodies to see if there's fuel spraying. Once you verify that's there some fuel reaching the intake, you can move forward from there. On...
  2. 04 R1 erratic temperature readings

    04-06 R1 Mechanical Help
    Lol and I’m a Rocket a scientist. I’m glad you solved your problem.
  3. 04 R1 erratic temperature readings

    04-06 R1 Mechanical Help
    After you ohm out the component you then move to power and ground, which would then be the harness which you can also ohm out. This is standard testing procedure taught at trade school, not my personal method. I would bet that the faulty harness had an abnormal resistance. And if you wanted to...
  4. R1 wont start please advise

    02-03 R1 Mechanical Help
    Low voltage can cause a few codes to show. But the ckp code can be an AC voltage signal that does not match the signal that was generated before the tear down. I would delete the codes and see what pops up after you fix the battery. If the battery wasn't properly charged before use, even if new...
  5. R1 wont start please advise

    02-03 R1 Mechanical Help
    The reason the solenoid was clicking was most likely due to low voltage in the battery. The battery may be able to handle the amperage of the primary side of the solenoid alone, but when the secondary side closes and sends power to the starter motor, the battery cannot handle the amperage and...
  6. 04 R1 erratic temperature readings

    04-06 R1 Mechanical Help
    So you are telling me that you are having bad readings of a temp sensor. You bought a piece of junk aftermarket sensor to replace the one you thought was bad, and you never did a resistance test to verify the problem. Beautiful. A resistance test can tell you if something shorted and damaged...
  7. 04 R1 erratic temperature readings

    04-06 R1 Mechanical Help
    Is heating the sensor not a dynamic environment? This testing procedure is straight from the service manual.
  8. 04 R1 erratic temperature readings

    04-06 R1 Mechanical Help
    If you’ve been doing this as long as I you would realize no resistance test is static, the wire heats up as you send voltage through it and that itself can change resistance of circuits by .1ohms or more. Never say impossible my friend. You can heat the coolant to 200 degrees or whatever...
  9. 05 start but won’t hold an idle

    04-06 R1 Mechanical Help
    Check first for air, fuel and spark. Do you mean turn over or idle? An idle would be 1000rpms and the starter typically turns the crank at only a few hundred rpms. A faulty cylinder identification sensor on most bikes will just put it into limp mode but it will still run. However a faulty...
  10. 05 R1 please identify this part

    04-06 R1 Mechanical Help
    Most likely the air injection system or SLS valve as BMW likes to call it. The hoses typically connect the 4 reed valves to a control valve and then the Airbox, so on overlap the expelling exhaust gas will pull clean air from the airbox through the control valve, reed valves and into exhaust...
  11. 04 R1 erratic temperature readings

    04-06 R1 Mechanical Help
    A simple resistance test can tell you if the sensor is in specification. Put the coolant temp sensor in a suitable container filled with coolant, ensuring the terminals do not get wet. Connect multi-meter leads to each terminal (02-03 r1 is green/white and black/blue). Using a thermometer and...
  12. 16 R1 will not stay on

    15-19 R1 Mechanical Help
    Check the air box also while you’re in there. I’ve had a buddy leave a towel in his rm250 airbox and we went 2+ hours up north to ride and we couldn’t figure it out at the trail lol.
  13. 16 R1 will not stay on

    15-19 R1 Mechanical Help
    That’s a good place to start! The best way to test for spark is to use an inline spark tester and set the gap to the factory setting, usually around 6mm. The tester must be grounded and if you see spark at 6mm then you know the coils are functioning. A spark plug will typically be visibly...
  14. 16 R1 will not stay on

    15-19 R1 Mechanical Help
    When you say run, do you mean it will idle? Or that it just turns over? I would check for spark, fuel and air, in addition to voltage testing the battery while it is cranking to ensure it can handle the amperage of the starter in addition to the TCI and fuel injection systems. Even if new, the...
  15. Clutch won't disengage

    02-03 R1 Mechanical Help
    First check for proper free play in the clutch lever, 10-15mm at the end of the lever. if that is in spec, you can try taking the freeplay out in order to disengage the clutch, but you risk slipping the clutch without enough freeplay in the cable. I would disassemble the clutch for inspection...
  16. racetech fork spring problem

    Appearance & Mods
    If you hear rattling, the tech may have neglected to use a proper spacer for the new spring, or if you hear it coil binding too soon, they may have installed the spring upside down which can cause premature coil binding in progressive rate springs. If the noise is just kind of a squish or...
  17. Exhaust

    Appearance & Mods
    Do a cold start, spray exhaust joints with warm soapy water and look/listen for bubbling. If you re-used gaskets for the headers there may be a leak. Recheck all connections for proper fitment first if you can.
  18. R1 2003 stock correct valve timing which is which??

    02-03 R1 Mechanical Help
    If the compression test was done correctly, all spark plugs removed and throttle held wide open to maximize air flow. And compression was the same with or without oil, you can rule out worn pistons rings. If you want to narrow down where air is leaking from, perform a leak down test for each...
  19. 2002 engine rebuild

    02-03 R1 Mechanical Help
    At the end of the day metal is metal as long as it fits correctly and is made of the proper alloy
  20. 2002 engine rebuild

    02-03 R1 Mechanical Help
    You can use OEM rings as long as you are sticking to the stock bore/service limits and the ring side clearance in addition to the end gap is the same. It would be easiest if you had the thickness of rings and the size of the groove of your piston, then you could subtract to figure a theoretical...
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