describe your starting process. you should not need to use ether
however in warmer temperatures, the fuel will evaporate from the carburetor thru the open vents and require the carb bowls to be refilled by cranking the engine over a few times to get fuel back in the carb
with the boat in the water, the motor running. look for a leak from the raw water pump, the circulating pump, or other locations.
use a flashlight, a mirror on a stick, or even your cell phone in selfie mode to look where you cant get your head.
for copywrite reasons, links to manuals can not be posted.
if you need a manual for a yamaha. see your local yamaha dealer or buy direct from yamaha, or buy a used one off of ebay or marketplace.
https://www.yamahapubs.com/
why did you replace the carb. hopefully you didnt buy one of the amazon special carbs.
did you service the points? what was the dwell before you set timing?
If you have the flusher before the pump, you need to have the motor running to be able to flush it
That means your garden hose MUST supply a lot more water than the raw water pump is moving, and hoses on the dock simply do not have that flow or much pressure. You need to have about 10 GPM of...
the cam could be toast.
do a leak-down test. that will tell you if the issue is valves, rings, head gasket, or washed out cam.
with the valve cover off, do all the rockers move the same amount (use a ruler or dial indicator)
based on those pictures, the inflatable was stored outside in the sunlight and degraded by UV. the base material of the skin has deteriorated. the bladder may be OK. most reputable inflatable companies offer new skins and bladders.
I would get a new inflatable.
I ran a superflush system on my last searay. it was the SF-400 https://www.superflushsystems.com/
simply hook up a garden hose, turn it on, and you can flush while in the water.
The other system I have used is the Neutra-Salt system developed for volvo pentas. it injects a salt-neutralizing...
Welcome aboard.
go thru the TB ignition troubleshooting tree in the stickies at the top of the sub-forum.
if you have the older 2-wire ignition trigger, that design was replaced nearly 20 years ago with the updated 3-wire design.
check that.
Spend the $18 on the right fitting. Or get the upgraded plastic one. That fitting is a replace ever 2 year deal
A thru - hull fitting for a live well does not work well for a motor supply
