gogittum
Well-known member
I have a 2000 Tohatsu 50 hp LPDI engine with about ~800 hours that sat for a couple of years off the boat. When I went to start it, I sprayed some light oil into the spark plug holes and figured it'd crank for a while and spread the oil. I got a surprise - it fired almost instantly and the throttle connection inside the cowling had gotten moved. The motor screamed into full throttle and I hit the switch to kill it.
I felt sick. I was sure the instant start and revving would've burned the rings at the very least, so I did a compression test on it. All 3 cylinders were right square on 90 psi, which to me seems very low, but they were at least even.
I looked online and found a site that said something to the effect that Tohatsu's have some kind of setup that limits cranking pressure and that 90 psi is normal for those engines - it's not full running compression. Sounds a bit odd to me, but of course I can't find that site again - has anyone had any experience with this ?? I plan to put the motor back into use in a couple of months and not sure if I'll need to re-ring it.
I felt sick. I was sure the instant start and revving would've burned the rings at the very least, so I did a compression test on it. All 3 cylinders were right square on 90 psi, which to me seems very low, but they were at least even.
I looked online and found a site that said something to the effect that Tohatsu's have some kind of setup that limits cranking pressure and that 90 psi is normal for those engines - it's not full running compression. Sounds a bit odd to me, but of course I can't find that site again - has anyone had any experience with this ?? I plan to put the motor back into use in a couple of months and not sure if I'll need to re-ring it.