Noob to Boats/Outboards needs help.

malc30

Recruit
Thread starter
Joined
Sep 9, 2007
Messages
3
Hi Guys it's my first post here so Hi to All. I have been reading the boards for the last few days so it is my Complete Noobness to Boats that makes me ask the following stupid questions not my lack of reading.
I have bought my first boat :D Nowt special at all just an old starter boat for myself & my dog to have a mess about on. I know nothing about this boat apart from the following, It's wooden & 22ft long & has a Mariner 15 outboard on the back. It was previously kept on a River but is now on my local canal.
I can strip & rebuild a car engine but this outboard is strange to me. Initially i had starting problems which i have rectified with decent fuel lines, secure jubilee clips & a new squeezy pump thingy. It starts as soon as you look at it now needing full choke which is immediately pushed in to about 25% once she fires. Engine sounds great & by manually tweaking the carb it sings perfect. My problem is at slow revs it would rather die than tick over. Now after reading the superb info on these boards (Thanks) I am lead to believe it is the Idle jet ? I took the carb off & used some carb cleaner which has improved it somewhat but still not ideal. The trouble i am having is on the canal it's a low speed route so gently chugging along is what i need rather than full on nose up rorting :D
Now as i look at the mechanism working on the top of the carb linkage under what appears to me to be the flywheel (?) there is a little black roller type thingy that is pushed round to open the butterfly. When in low rev position it seems to drop back to a notch which is obviously where it is cutting out for me. Now i can see that by releasing two nuts i can adjust this so it doesn't drop into the notch & maintains a higher rev but something just doesn't feel right in my head so i am asking here.
The problem on a river or lake would be non existent as i can maintain any speed comfortably above the pace i need, ****** typical a.

So basically i think i need to strip down my carb to release the idle & high speed jets to get better running. My problem is that i really don't want to take the jets out as it will mean me having to re-seat them. In my mind i am confident but as it all looks so Alien to me i ask here before i make a complete balls up of it & end up with a dead motor.
What would really help is if someone could point me in the direction of a schematics diagram on my carb. I need some reassurance through pics that i will be able to do it rather than kill it.

Also any links to posts you feel i Must read would be appreciate as is any other help/suggestions.
Cheers for reading.
 

Silvertip

Honorary Supreme Mariner
Joined
Sep 22, 2003
Messages
28,772
Re: Noob to Boats/Outboards needs help.

Until you have a service manual for the engine you are very wise not messing with the cam and roller assembly you mentioned. On a two stroke engine you will note that the ignition timing and carb opening are synchronized. Get that relationship out of whack and you have a poorly running engine. Until the carb(s) are thoroughly cleaned don't muck with the linkages. That process is called "Link and Sync". Too detailed to go into here but check the FAQ, seems to me the process is detailed there.
 

kenmyfam

Supreme Mariner
Joined
Aug 10, 2006
Messages
14,398
Re: Noob to Boats/Outboards needs help.

4 things to do.

1) Get a manual
2) Rebuild the carb (s)
3) Do a link and synch
4) Enjoy your new found low speed running.
 
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