my engine is blowing up....

[catfish charlie]

guys my 78 merc is falling apart. the engine has been sitting for a little over 1 year. it cranked right up and i ran it for maybe 1 hour. then it just quit. it will not start.. compression is good on all cylinders.. except one which has 30.. the carbs are leaking gas from the bottom..and i found out that the number 5 and 6 cylinder is not firing.. what else will happen.. where do i start with the firing issue? also i want to find out if the rings are stuck n number 4 cylinder.. anyway how can ido that? any helpwould be appreciated. i never had mercury before just yamaha so im a little lost on this one..

 

[Barnacle_Bill]

Re: my engine is blowing up....

You can try a decarb (see FAQs) to see if you can get that compression up. Until that is done the rest of the problems are not worth worrying about.

 

[catfish charlie]

Re: my engine is blowing up....

ok since motor will not crank how do i use sea foam..how long do ilet it stand and how much do iuse in each cylinder..