Mercury 40hp battling to start and dies

by Nik
(Groote Eylandt)

I have a 2005 40 hp Mercury 2 stroke 3 cylinder. I am battling to get it started. Eventually after opening the throttle and about a hundred pulls it fires. It run fine in open throttle but dies as soon as I drop the throttle back. I have serviced the carbs, replaced the coils, stato, Cdi box and plugs but I can't get it right. I have had another exact engine side by side and adjusted the timing to exactly the same on the running engine. The only thing I haven't done are the reed valves. Could this be the problem? It also backfires whilst I'm trying to get it started. Please, any help would be much appreciated

Click here to post comments

Join in and write your own page! It's easy to do. How? Simply click here to return to Mercury Forum.