I recently bought this boat from a friend, good price, some deferred maintenance, etc.... He only owned it for a year or two and didn’t do much to it.
My buddy stated he had trouble getting the boat to stay running. His neighbor/ mechanic told him the carb needed a rebuild. I looked at the receipts from the prior owner and found a local shop had replaced the original carb with a used carb they had. There are no numbers or tags on the carb, but after a little research I believe this one is a Rochester 2bbl with 2 idle mix screws. The carb looked pretty bad and wouldn’t stay running for me with the boat on the garden hose. it would start right away and die after a few seconds even after adding throttle. I replaced the fuel filter, new fuel, etc... sounds like the float might need attention. Tried a little to find somewhere to have the carb rebuilt and found dead ends.
so I did a little research and found the boat came with a Nikki 2 bbl part number 856845. I found a reman carb online for $400 and put that on. Boat started and ran fine, until the choke kicked off, them the rpms rise to 2500 - 3000. I disconnected the throttle linkage completely and no change.
I did a vacuum leak test and believe I found a leak in the intake manifold gasket on the 1,3,5 bank about midway. I pulled the intake and sure enough the gasket was compromised there. Replaced the gaskets, RTV,d the front and rear where there is no gasket, spreading the rtv up 1/2” up the gasket tabs on each end.
put it all back together and same thing, can’t seem to dial down the rpm’s at all. Could there be a vacuum leak within the new carb? Thinking I should send it back and try to have the old carb rebuilt? Can’t afford too many more $400 hits with no success.
Any help would be appreciated.
My buddy stated he had trouble getting the boat to stay running. His neighbor/ mechanic told him the carb needed a rebuild. I looked at the receipts from the prior owner and found a local shop had replaced the original carb with a used carb they had. There are no numbers or tags on the carb, but after a little research I believe this one is a Rochester 2bbl with 2 idle mix screws. The carb looked pretty bad and wouldn’t stay running for me with the boat on the garden hose. it would start right away and die after a few seconds even after adding throttle. I replaced the fuel filter, new fuel, etc... sounds like the float might need attention. Tried a little to find somewhere to have the carb rebuilt and found dead ends.
so I did a little research and found the boat came with a Nikki 2 bbl part number 856845. I found a reman carb online for $400 and put that on. Boat started and ran fine, until the choke kicked off, them the rpms rise to 2500 - 3000. I disconnected the throttle linkage completely and no change.
I did a vacuum leak test and believe I found a leak in the intake manifold gasket on the 1,3,5 bank about midway. I pulled the intake and sure enough the gasket was compromised there. Replaced the gaskets, RTV,d the front and rear where there is no gasket, spreading the rtv up 1/2” up the gasket tabs on each end.
put it all back together and same thing, can’t seem to dial down the rpm’s at all. Could there be a vacuum leak within the new carb? Thinking I should send it back and try to have the old carb rebuilt? Can’t afford too many more $400 hits with no success.
Any help would be appreciated.
