1989 Yamaha 130 was running fine when last used 3 months ago, had some work done to lower unit, put it back together, and when first tried to crank it, it was locked up. after some elbow grease manually turning flywheel, it will turn some, but wont freespin. Does this sound like a tight piston, or maybe a rod bearing? Was hoping to fish this weekend, but looks like that’s out now:frowning_face:
22 Seminole CC
130 Yamaha
Bill Daniels
What did you do to the lower unit? You might have something wrong and its binding up. It would be easy to pull the foot and see if it turns easily then.
Hydra-Sports 22 Bay Sport
225 Rude
That was the first thing i thought of, immediately removed the lower unit, and removed spark plugs and tried to turn the crank. Being ignorant to exactly how a 2 stroke works, versus a car engine, I’m wondering exactly how the rod bearings and the journal bearings get lubrication
22 Seminole CC
130 Yamaha
Bill Daniels
The two stroke oil is the lubricant. The oil is mixed with the gas and this mixture goes from the carburator through a reed valve into the crankcase. This lubricates the moving parts before it gets sucked, via a port in the cylinder, into the combustion chamber, then ignited and finally exhausted.
Sounds like you may have a head gasket leaking water into the cylinder allowing some surface rust to build up over the downtime? Try spraying Marvel Mystery Oil into the plug holes, then spin by hand to see if it frees up.
…Politicians aren’t the “Oldest Profession”, but the results are still the same!!!
quote:Thanks, that sounds like alot easier fix than tearing the whole motor down, and if it is the crank itself, I would be concerned that it is not getting oil correctly and would have to be torn down and rebuilt anyhow. I can handle replacing the head gaskets. That's why I like this site, most everybody is so helpful and don't talk down to people just because they're not as knowledgeable as others.
Originally posted by Mixed NutzThe two stroke oil is the lubricant. The oil is mixed with the gas and this mixture goes from the carburator through a reed valve into the crankcase. This lubricates the moving parts before it gets sucked, via a port in the cylinder, into the combustion chamber, then ignited and finally exhausted.
Sounds like you may have a head gasket leaking water into the cylinder allowing some surface rust to build up over the downtime? Try spraying Marvel Mystery Oil into the plug holes, then spin by hand to see if it frees up.…Politicians aren’t the “Oldest Profession”, but the results are still the same!!!
22 Seminole CC
130 Yamaha
Bill Daniels
quote:
Originally posted by Mixed NutzThe two stroke oil is the lubricant. The oil is mixed with the gas and this mixture goes from the carburator through a reed valve into the crankcase. This lubricates the moving parts before it gets sucked, via a port in the cylinder, into the combustion chamber, then ignited and finally exhausted.
Sounds like you may have a head gasket leaking water into the cylinder allowing some surface rust to build up over the downtime? Try spraying Marvel Mystery Oil into the plug holes, then spin by hand to see if it frees up.…Politicians aren’t the “Oldest Profession”, but the results are still the same!!!
What mixed nutz said. If it does free up, you may get lucky and it run for years more or if as mixed suggested it got water in it may have pitted cyl walls and you may lose compression. Lot’s of auto parts stores have a rental program or will let you borrow a compression tester. Make sure all cyl are pretty much equal and one not way less than the others.
If you had a bown headgasket and it had been sitting, most likely you could pull plugs and see a “rusty” water stained plug.
Rick
23 Center Console
Twin 140s
“Dirty Money”
quote:Thank you so very much, pulled the heads, and exactly as you said, port side cylinders were the culprit. Didnt look too bad, new head gaskets on order, motor spinning freely now, will post in offshore reports as soon as I get a good weather window
Originally posted by Mixed NutzThe two stroke oil is the lubricant. The oil is mixed with the gas and this mixture goes from the carburator through a reed valve into the crankcase. This lubricates the moving parts before it gets sucked, via a port in the cylinder, into the combustion chamber, then ignited and finally exhausted.
Sounds like you may have a head gasket leaking water into the cylinder allowing some surface rust to build up over the downtime? Try spraying Marvel Mystery Oil into the plug holes, then spin by hand to see if it frees up.…Politicians aren’t the “Oldest Profession”, but the results are still the same!!!
22 Seminole CC
130 Yamaha
Bill Daniels
Happy to hear that!!
…Politicians aren’t the “Oldest Profession”, but the results are still the same!!!
Make sure to clean out the water jackets while the heads are off. Clean the carbon off the tops of the pistons too.
Scout 185
quote:Yes sir, gonna clean everything up good and make sure it's right
Originally posted by loopervetMake sure to clean out the water jackets while the heads are off. Clean the carbon off the tops of the pistons too.
Scout 185
22 Seminole CC
130 Yamaha
Bill Daniels