Page 2 of 2 FirstFirst 12
Results 11 to 13 of 13
  1. #11

    Join Date
    Jan 2019
    Location
    Parrish, FL
    Posts
    7
    Quote Originally Posted by jeffg426690 View Post
    Reach under the plastic cover to turn motor by hand (plugs need to be out to be able to do this), doesn't matter on a 2-stroke which way you manually turn the crankshaft.
    Don't over think it in speculation:

    Charge battery to full.
    Pull plugs and attempt a compression test. (assuming it turns over freely)
    If it wont spin freely w plugs out you have a piston issue, time to pull the motor and get wrenching.
    If it turns over freely by hand but not w starter: electrical issue.
    If compression is good, remove carbs and rebuild them, go through the fuel system from the tank back (inspect fuel pickup, vent check valve, fuel selector, all fuel lines).
    Rebuild carbs regardless, even if you are rebuilding top end as well.

    Just my 2 cents Let us know what you find!

    Thanks for your explanation! I can turn the engine with my hand, but it is very difficult. I could see the top of the piston was about 3 inches from the spark plug hole and now it is about 6 inches. It is really tough to move though. The part of the crank shaft that i was holding on to was very rusty and the part that it connects to that goes out of the hull is pretty corroded. I think its called the intermediate housing? I was able to get better leverage using the the part protruding from the engine to turn the shaft. I'm preparing to start taking apart the top and may get the starter tested while im at it.

    Heres a picture:


  2. #12
    Yamaha artisan Cutlass's Avatar
    Join Date
    Oct 2010
    Location
    Madison, WI, USA
    Posts
    2,541
    +1
    62
    Before you open the engine up, you might want to do a 2 stroke pressure test to make sure there arenít any air leaks in the engine. If there is, then youíre going to need to reseal the whole engine.

  3. #13

    Join Date
    Jan 2019
    Location
    Parrish, FL
    Posts
    7
    Quote Originally Posted by Cutlass View Post
    Before you open the engine up, you might want to do a 2 stroke pressure test to make sure there aren’t any air leaks in the engine. If there is, then you’re going to need to reseal the whole engine.
    Thats perfect because if I want to pull out the starter, I’ll have to remove the exhaust anyways. Thanks a lot for the advice!

    An air leak could be contributing to the lean condition you mentioned on post 9.


Page 2 of 2 FirstFirst 12

Thread Information

Users Browsing this Thread

There are currently 2 users browsing this thread. (0 members and 2 guests)

Similar Threads

  1. Yamaha SUV low rpm vibration
    By mgonzo700 in forum Yamaha PWC Performance (2-stroke)
    Replies: 4
    Last Post: 09-24-2015, 06:15 AM
  2. Replies: 0
    Last Post: 04-23-2014, 12:30 PM
  3. Yamaha SUV 1200; No speed but has RPM's. Impeller looks good?
    By BombThreat in forum Yamaha Open Discussion
    Replies: 4
    Last Post: 10-15-2013, 08:39 AM
  4. 2001 yamaha xlt 1200 problems reaching high rpm in water
    By jimmy1173 in forum Yamaha PWC Performance (2-stroke)
    Replies: 4
    Last Post: 04-10-2012, 01:19 PM
  5. Yamaha SUV / pretty much any yamaha 1200 non-power valve questions and tripple Mikuni
    By macGruber in forum Yamaha PWC Performance (2-stroke)
    Replies: 6
    Last Post: 03-28-2012, 03:25 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •