"Sorry for the long story. Pi
"Sorry for the long story. Picked up a used boat and motor (16' Lund Chellenger and 40hp Merc s/n: 0C159693) last fall. Ran great last year (about 15 hours). My buddy the boat guy pulled it out of the Winnipeg river and winterised it for me. Ran it with muffs this spring and was running rough. Swapped out the plugs and ran like a dream. We put the boat back in the really cold water late may. Ran for an hour before losing top end. Was running at WOT and suddenly had no RPMs. I thought the trottle cable slipped. We checked all the linkages and such and it looked good. Took it in to a highly recommended, very reputable rapist, sorry, meant to say boat shop.
Their report: spark and compression - ok. removed and replaced water jacket gasket, inspected pistons, block had water in top end. Ran up ok.
$425 labour, $75 parts.
Put it back in the water and ran like new for an hour and then same problem. only 300 yards from where it happened the first time. Starts great, runs smooth, no RPMs.
Back in the shop. They say with all the work they've done the motor's running so good that the rev limiter is kicking in. Recommended changing prop to a courser pitch. Was running an 11 they suggested a 13.
$65 Labour.
Guy at the prop shop looked at me like I had three heads when I asked for a 13 pitch prop for my setup. Said a 12 was the most he'd put an it. Laughed at my prop. Was supposed to be an 11 but absolutly no cupping on the blades. Picked an 11 and a 12. Tried them both out with no improvement.
Question: Does the rev limiter need to be manually reset and if so, how? Any other theories to the root cause of my power loss? Should I expect any other problems with the motor? (Normally a good runner?)
Thanks
Ron"
"Sorry for the long story. Picked up a used boat and motor (16' Lund Chellenger and 40hp Merc s/n: 0C159693) last fall. Ran great last year (about 15 hours). My buddy the boat guy pulled it out of the Winnipeg river and winterised it for me. Ran it with muffs this spring and was running rough. Swapped out the plugs and ran like a dream. We put the boat back in the really cold water late may. Ran for an hour before losing top end. Was running at WOT and suddenly had no RPMs. I thought the trottle cable slipped. We checked all the linkages and such and it looked good. Took it in to a highly recommended, very reputable rapist, sorry, meant to say boat shop.
Their report: spark and compression - ok. removed and replaced water jacket gasket, inspected pistons, block had water in top end. Ran up ok.
$425 labour, $75 parts.
Put it back in the water and ran like new for an hour and then same problem. only 300 yards from where it happened the first time. Starts great, runs smooth, no RPMs.
Back in the shop. They say with all the work they've done the motor's running so good that the rev limiter is kicking in. Recommended changing prop to a courser pitch. Was running an 11 they suggested a 13.
$65 Labour.
Guy at the prop shop looked at me like I had three heads when I asked for a 13 pitch prop for my setup. Said a 12 was the most he'd put an it. Laughed at my prop. Was supposed to be an 11 but absolutly no cupping on the blades. Picked an 11 and a 12. Tried them both out with no improvement.
Question: Does the rev limiter need to be manually reset and if so, how? Any other theories to the root cause of my power loss? Should I expect any other problems with the motor? (Normally a good runner?)
Thanks
Ron"