Riverrunner58
Cadet
- Joined
- Jul 25, 2016
- Messages
- 9
Wise ones:
I am currently trialing a Merc 15 hp 2 stroke (1998) SN: [FONT="]0G597656
When I first checked out this motor from the seller, he had trouble starting it, but got it going after 15 pulls or so. I tested compression (110 in both cylinders), spark plugs OK and everything else seemed to look OK, besides the top end not being super shiny and clean under the cowling.
This motor had been serviced "a year or two ago" and had only been run 2-3 times in the past few years. Definitely had old gas in it, not stored properly, etc, but at least kept indoors. Obvious that this guy knew little about maintaining his outboard, but it does seem to start, run and idle well once it's going.
I've taken it out a few times in the past week and have had the same starting issue: takes ~20 pulls to start from cold, but runs well after that for 6+ hours at a time. I did try spraying starting fluid in the carb ONCE from cold start (before reading on this forum that I shouldn't use this method) and it started first pull from cold. This motor has a primer knob that is pulled out to start, but even though it starts reliably after it's warm, it usually will die after shifting into F or R UNLESS I keep the primer knob pulled out until throttling up and then I can push the knob in and it will run with no problem.
What are your suggestions for getting this motor to run or should I "run away"? I figure if I buy it I should rebuild the carb, replace the plugs, probably replace the impeller for good measure. I already changed the lower unit oil.
I don't have a lot of experience re-building/cleaning carbs, but am eager to learn. Here is the parts diagram: [/FONT]http://www.iboats.com/Carburetor-Seapro-Marathon-15-25-Super-15/dm/cart_id.514796973--session_id.785567328--view_id.1695907
What do I buy for the rebuild? Repair kit (#17) or can I just buy new Diaphram/Gasket (#22)?
I've been reading on here about using Dunks Decarb method and, though I know that clean the carb, would it hurt to run it first before changing the plugs/cleaning carb? Any other suggestions?
Thank you for any help!
I am currently trialing a Merc 15 hp 2 stroke (1998) SN: [FONT="]0G597656
When I first checked out this motor from the seller, he had trouble starting it, but got it going after 15 pulls or so. I tested compression (110 in both cylinders), spark plugs OK and everything else seemed to look OK, besides the top end not being super shiny and clean under the cowling.
This motor had been serviced "a year or two ago" and had only been run 2-3 times in the past few years. Definitely had old gas in it, not stored properly, etc, but at least kept indoors. Obvious that this guy knew little about maintaining his outboard, but it does seem to start, run and idle well once it's going.
I've taken it out a few times in the past week and have had the same starting issue: takes ~20 pulls to start from cold, but runs well after that for 6+ hours at a time. I did try spraying starting fluid in the carb ONCE from cold start (before reading on this forum that I shouldn't use this method) and it started first pull from cold. This motor has a primer knob that is pulled out to start, but even though it starts reliably after it's warm, it usually will die after shifting into F or R UNLESS I keep the primer knob pulled out until throttling up and then I can push the knob in and it will run with no problem.
What are your suggestions for getting this motor to run or should I "run away"? I figure if I buy it I should rebuild the carb, replace the plugs, probably replace the impeller for good measure. I already changed the lower unit oil.
I don't have a lot of experience re-building/cleaning carbs, but am eager to learn. Here is the parts diagram: [/FONT]http://www.iboats.com/Carburetor-Seapro-Marathon-15-25-Super-15/dm/cart_id.514796973--session_id.785567328--view_id.1695907
What do I buy for the rebuild? Repair kit (#17) or can I just buy new Diaphram/Gasket (#22)?
I've been reading on here about using Dunks Decarb method and, though I know that clean the carb, would it hurt to run it first before changing the plugs/cleaning carb? Any other suggestions?
Thank you for any help!
