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  1. 9

    97 Outboard C90 Water on Plugs

    I am confused on what a spark arrester is on a premix 2 stroke motor
  2. 9

    slight gas in oil 2009 yamaha 4 stroke

    do a search for Yamaha performance bulletins and find a boat and motor like yours to see what they used
  3. 9

    Power Trim

    hook a voltmeter to the incoming and out going terminals of the T&T repay to see what kind of voltage is getting to the T&T motor, would not hurt to check the voltage is on the battery itself to compare to that the T&T relay and motor is getting. maybe just burnt contacts in the TT&T relay not...
  4. 9

    97 Outboard C90 Water on Plugs

    do a leak down test with compressed air and see where air leaks to. but if all 3 have water signs I would guess the exhaust plate corroded thru. time to open it up and look
  5. 9

    97 Outboard C90 Water on Plugs

    are we supposed to guess what the compression #s were?
  6. 9

    2003 Yamaha 50 hp 2 stroke

    I guess your flux capacitor in the pic is a plugged-up pilot jet on #1 carb
  7. 9

    Will not pee

    why worry about that. check to see if it is stuck open I just reread your other post, I have no idea how air would be coming out of the pisser, maybe it is exhaust gases from a blown head gasket letting exhaust into the cooling passages
  8. 9

    Will not pee

    if the PRV is stuck open it will dump too much water to fill the block at low RPM
  9. 9

    Will not pee

    exactly what would block the water from coming out of the stat opening with it out? if water does not get up to the top of the head/block it is ot pumping properly
  10. 9

    Will not pee

    I thought the same thing, but he said he was not getting water to the stat, so blocked tell tail would not cause that
  11. 9

    Will not pee

    why was it replaced? did you have a overheat problem? if the housing has a problem it needs to replaced also
  12. 9

    Will not pee

    drop it into the water and try it, sometimes they have trouble on a hose. did you use a Yamaha water pump kit or after market?
  13. 9

    2003 Yamaha 50 hp 2 stroke

    have you put a timing light on the motor to see exactly what the idle timing is when cold and after the motor has warmed up? also when at high RPM. good compression, good spark at the correct time, and proper fuel to air. test what you can and then chase the fuel to air my 1999 C40 had a bad...
  14. 9

    2003 Yamaha 50 hp 2 stroke

    did the new middle carb come with a new prime start assembly?
  15. 9

    Suzuki 2007 DF115 Cranks But Won't Fire

    30 hours in 17 years is not good for a motor. I am not sure what 100% gas is now a days. seems that motor has spent it's life sitting and not having much fresh fuel fed to it. good luck with it from now on, but you need to run it more often
  16. 9

    Cant find the year of my mot

    1987 https://www.boats.net/catalog/yamaha/outboard/1987/40hp/40sh?msclkid=ea86595ff8841b3160a83fb4247bc583&utm_source=bing&utm_medium=cpc&utm_campaign=TNT_Text%20-%20DSA%20-%20OEM%20Parts&utm_term=yamaha&utm_content=Yamaha
  17. 9

    Cant find the year of my mot

    what country are you and your motor in? can you post that letters are after the 40S
  18. 9

    slight gas in oil 2009 yamaha 4 stroke

    only way to know if you have the motor propped right is to run it WOT to see what RPM it gets too. you do not have to keep running it hard tho
  19. 9

    15HP Yamaha overtemp light

    service manual for your motor will have the specs. I would think most motors would be the same, but I cannot say that is true
  20. 9

    15HP Yamaha overtemp light

    all I can think of is to do a chemical clean of the motor, good chance there is a buildup in the cooling passages. WOT burns more fuel and creates more heat. and it is not a good idea to keep running a motor that is overheated . the motor lets you know there is a problem, so you need to shut...
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