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  1. 9

    2006 DF115 Stuck valves?

    good news so far. did cylinder walls look OK now pull the valve covers and check valve clearances, maybe too tight . or if bent too loose., I cannot think of much that would cause all cylinders to have low compression. if valves are good, all rings stuck maybe that one 5375 pic bottom right...
  2. 9

    2006 DF115 Stuck valves?

    bore scope would be a good tool to look in the cylinders. Should see if pistons hit the valves
  3. 9

    2006 DF115 Stuck valves?

    have you looked into the cylinders when you had the plugs out?
  4. 9

    Interchangeable lower units??

    running shallow with motor jacked up would be my guess
  5. 9

    2008 F250TXR code 72?

    if there was metal in passages there is a good chance it got into the bearings and oil pump and maybe lots of other places causing damage to them. I do not believe all the oil flows thru the filter before heading on to other parts of motor. but I could be wrong good luck
  6. 9

    2008 F250TXR code 72?

    Not sure what the oil pressure should be reading at certain RPMs, might be too high or too low for the RPM the motor is running. but I would be worried about not having high enough pressure since you lost a bearing before. what bearing was it? and what kind of failure did it have?
  7. 9

    2008 F250 no fire on port side HELP PLEASE

    he asked how
  8. 9

    2008 F250 no fire on port side HELP PLEASE

    then you need to be sure you have good spark at the proper time on all cylinders proper fuel to air is hard to test I am sure compression would say some about the valve timing
  9. 9

    2008 F250 no fire on port side HELP PLEASE

    good compression, good spark at the correct time, and the proper amount of fuel to air is necessary to burn properly, testing it all is the only way to know for sure, sounds like does not cut it
  10. 9

    2018 Yamaha 40 HP that dies after about 20 minutes

    No sensors that will kill the motor. have you tried pumping the primer bulb to see if carbs or VST(if injected) need more fuel? as soon as it dies turn the key off and drain the VST of carb bowls to see if there is still plenty of fuel in them. have you tried loosening the cap to see if a...
  11. 9

    DT50 Suzuki 2 stroke.

    sounds like it is running low on fuel in the carb bowls . not enough fuel to keep up with the high RPM fuel burn . have you tried pumping the primer bulb while the problem is happening to see it that helps? maybe fuel weak pump, restriction in filter or line, or sucking in air at a connection
  12. 9

    Suzuki DT75 ignition switch & non firing

    Sorry , I do not have anything for Suzuki's either, but I never had one of those motors either so why would I have a manual for one
  13. 9

    Suzuki DT75 ignition switch & non firing

    not sure about Suzuki's, but with Yamahas I would measure the input voltages to the CDI and output voltages of CDI to make sure what does and what does not meet specs in your service manual. that should narrow down where to be looking if you have good input but no outputs, I would think the...
  14. 9

    Spark plugs

    on one of his other threaeds on this problem he said it was a 2003 F50 Yamaha
  15. 9

    Spark plugs

    yes, vacuum gauge for syncing the carbs/cylinders. But that is not what he said timing is changed by I guess the CDI/ECU on your 4 stoke motor using inputs it gets from sensors. you have no idea what it is doing while running at idle or above unless you check it. and then compare to the...
  16. 9

    Spark plugs

    as I said in that other thread, you just use a timing light hooked to #1 plug wire to see when the spark is happening, just like on an automotive motor. cam timing is totally different, you just follower the manual making sure the timing marks line up properly. I have no idea how someone...
  17. 9

    Spark plugs

    normally if everything is in spec and clean the settings in manual work. have you made sure the spark timing is in spec like I mentioned before
  18. 9

    Spark plugs

    OP will not show up and post he was all wrong about what he thought
  19. 9

    Spark plugs

    maybe you are confusing Metric and what we use here in the USA
  20. 9

    Gas or oil out of exhaust

    that 2017 should be a 4 stroke motor, so no burning of oil. have you checked levels and condition of motor oil and lower unit lube? also might want to look at your spark plugs to see if you see something different on one or more plugs
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