91 Merc 200hp hard to start (warm and cold)

jayj

Recruit
Joined
Aug 1, 2002
Messages
2
Hi, I have a 200hp carb'd with about 500 hrs. on the engine (new to me though) and it is extremely hard to start when it is cold or and stubborn to start when it is hot. When it is cold, I have to choke it and play with the throttle setting. This goes on for several trys until it fires. When it does fire-up, it smokes like heck for several seconds and then settles down (probably needs to be a very rich mixture to start). After it is warmed up...<br />It seems to run great from idle to WOT, without hesitation. The idle seems a bit rough, engine shakes and shutters, but not too much smoke. The part that is a little annoying is that when the engine is warm and has been shutdown and I try to restarted, 2 times out of 3 requires me to give it part to full throttle to start it so it won't stall, otherwise it will fail to idle. It will then puff more fuel laden smoke for a couple of seconds. Sorry it took so long, but my question is: Is this normal for this engine or should it be easier to start when warm?<br />Thanks in Advance.
 

bryanredfish

Petty Officer 2nd Class
Joined
Apr 22, 2002
Messages
182
Re: 91 Merc 200hp hard to start (warm and cold)

I just recently had the EXACT same problem with at 2002 Mercury. Turns out that it was a piece of aluminum in the low idle pick-up. Took it to the shop, and they blew out the pick-ups, and it runs like a dream! Huge difference. I now REALLY like this motor.
 

jayj

Recruit
Joined
Aug 1, 2002
Messages
2
Re: 91 Merc 200hp hard to start (warm and cold)

bryanredfish,<br />Thank you for the reply and I'm glad to hear that your proplem was cleared up! I just didn't want to mess with something if it wasn't broke. Now I'll dive into the carburetors and do a full tear down and clean them up!<br />It was obvious that the previous owner had problems because he had a can of starting fluid hidden behind the seat (kind of a scary thought but there appears to be no apparent damage). I promise to NEVER use starting fluid because I know the kind of damage it can do to an engine!!! I've seen too many holes in pistons and bent rods from friends and family...the starting fluid as been removed from the boat. <br />Regards,<br />avenger20
 
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