Cylinder lost

[Reel magic]

Guys if you have a 1995 200 salt water series carb engine and it loses a cylinder will the engine still idle smooth?smooth as idle the same rpm as the other in or out of gear?I have a pair of 1995 200 yamaha's Salt Water series engines.I have noticed lately that both crank up easy cold with 1 click of the electric choke idle at 7/8 in nuetral 550-600 in gear.But when I go to plain off with the binnacle controls being pushed evenly I have to give the port engine a little more throttle to get it up to the same rpm as the strd engine.Once up on plain its not as noticable they even out .But I have noticed that the port engine tends to lose rpm faster than the str like a 100 rpm drop at times in current etc.Could I be losing a cylinder?Or more of a ignition problem?I can tie the boat up to the dock and in neutral reeve up each engine different times and the strboard engine seams to be more crisper and quicker to the trhottle than the port?But if I was losing a cylinder shouldn t the engine lose rpm or idle rough? oir satll?at idle?<br />Thanks for any help

 

[gov2mod]

Re: Cylinder lost

I'd look at the fuel first. Just a few drops of water in a carb will make a difference. Do you use any drygas or other water remover additive? That's the first thing I would do. You can take the drain plug from the carbs on the engine in question as the water settles to the bottom but I would use the drygas on a regular basis.

 

[rodbolt]

Re: Cylinder lost

also check the fuel pumps. it may just be time for new ones. may be time to clean the carbs as well. a compression test is cheap and easy. the tester is about 20 dollars or so at wally world.

 

[31900]

Re: Cylinder lost

Another do first check for me would be spark plugs.

 

[Reel magic]

Re: Cylinder lost

Hello Guys I d like to say thanks to everyone whom replyed to my ??.I did do a compression test and all 6 cylinders are 120 lbs.I did notice that the 3- spark plugs that I removed from the port bank was a nice chocolate brown,looked like they were burning nice.But the 3 plugs that I removed from the starboard bank was white and looked like they have never really changed much in color from being new?? By the plugs reading like this.Would the starboard bank be running with water? in the fuel?Why are they kinda clean looking not much color change from new but the port bank is burning what I would say is great a chocolate brown color.Could I have a head gasket leaking on that bank? or maybe a air leak?Any help would be certainly appreciated.Thanks In Advance

 

[rodbolt]

Re: Cylinder lost

I would look at fuel as well. cyl's in two strokes dont fail over time. they fail all of a sudden. also inspect the fuel pumps. or just replace them as maint every 3 years. never saw a pump failure on a 2.6L motor on thet schedule, all bets are off on the 3.1. may just be time for a carb cleaning. I dont reccomend dry gas much cause it can be hard on the thin rubber parts and aluminium tanks.

 

[Reel magic]

Re: Cylinder lost

Rodbolt thanks for a quick reply.I did have the carbs cleaned and new kits installed with floats back in january this year.The boat does have 2 seperate fuel tanks.I did think about water in the fuel on that tank but would that make the 1,3,5, plugs burn a white color? not chocolate brown like the other bank 2,4,6?Correct me if I'm wrong but if it was carburation why 3 plugs burn correct color and the other 3 does not?By the way this engine has 2- fuel pumps is one fuel pump for starboard cylinders and the other fuel pump for port cylinders?Isn't it kinda odd that the starboard plugs burn nice color and the port is white?.Thanks

 

[Ray Neudecker]

Re: Cylinder lost

It is not normal for one bank to be that much leaner than the other. Some of those models required different jetting on one bank than the other. It is possible they were swapped to the wrong bank when the carbs were torn down.