missing and boggy after running for 20 min

[ccraig]

I just bought this 84 doral 19foot bow rider , it has been sitting for a 1 1/2 , I have got it running but tried it on the water and after running for 20 - 25 min it starts to really bog and miss , i'v checked tank for dirt , repaced coil , plugs,wires points condensor, fuel pump , cleaned carb and installed carb kit and replaced all fuel lines .this is a mecruiser 140 Any suggestions thanks

 

[oops!]

Re: missing and boggy after running for 20 min

i had a 140 with a bad dist cap....and an improperly installed set of points...that did somewhat the same.....

but it sounds like you have a vaccum leak devoloping when the motor gets warm....

but lets get this moved to the right forum so our gurus can see it....

this is the forum for reporting problems with the actual website

\cheers
oops

 

[oops!]

Re: missing and boggy after running for 20 min

btw.....have you pulled the plugs to see if they are wet .....(when it starts bogging......it could be a cracked manifold problem