1st time out, boggy?

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floater212

Petty Officer 2nd Class
Joined
Nov 27, 2013
Messages
146
put boat in yesterday at the marina, went to slip to get the gang, idles smooth but got onto river and gave it some gas little bog, ran down stream for 3 miles, way to windy the white cap were going across river not with the river, turned around and gunned it took forever to get on plane and only hit 30mph on my speedo. I'm hoping it was just leftover gas from last season, thought i used stabil but not sure. It has a 42 gallon tank and it took 20 to 27 gallons to fill, so ratio of good gas to bad gas is 2/1, going to try the enzyme treatment, used before and seemed to help. then next fill up all should be fine. what do you think??
 
ukstu

ukstu

Seaman
Joined
Nov 25, 2018
Messages
50
I had this just recently. Had put one of the plug leads on the wrong plug by mistake when I fogged the cylinders. Ran fine on idle when running up, only showed a problem when trying to put power on under load.
Maybe worth a check..??
 
F

floater212

Petty Officer 2nd Class
Joined
Nov 27, 2013
Messages
146
ukstu said:
I had this just recently. Had put one of the plug leads on the wrong plug by mistake when I fogged the cylinders. Ran fine on idle when running up, only showed a problem when trying to put power on under load.
Maybe worth a check..??
Click to expand...
i'll check but i haven't bought the new plugs yet! lol
 
F

floater212

Petty Officer 2nd Class
Joined
Nov 27, 2013
Messages
146
OOPS! sorry, it's a 350 mpi 300hp 2005 in a rinker cativa 212 rx1, engine serial # 0W037384.
 
79Invader

79Invader

Seaman Apprentice
Joined
Apr 23, 2019
Messages
45
Do you use ethanol fuel (regular gas station) or the 100% gasoline fuel (pump at the marina)? If ethanol fuel was left in all winter I'm sure its gone bad by now (assuming you forgot stabil..), has a shelf life for 3 months.

Topping off with fresh should have helped though. You may have to have it scanned for codes.
 
Q

QBhoy

Fleet Admiral
Joined
Mar 10, 2016
Messages
8,342
Hi.
about the spark plug gap. Good idea to remember that this engine absolutely needs the iridium plugs and they don’t get gapped.
but more crucial...without doubt, you are seeing what 99% of mpi owners do after winter or storage...the infamous trademark mpi Diz cap issue.
 
F

floater212

Petty Officer 2nd Class
Joined
Nov 27, 2013
Messages
146
just bought plugs and looking for new cap and rotor now. Thanks. plug are the mr43lts, next season iridiums, what's the brand and number?
 
Q

QBhoy

Fleet Admiral
Joined
Mar 10, 2016
Messages
8,342
floater212 said:
just bought plugs and looking for new cap and rotor now. Thanks. plug are the mr43lts, next season iridiums, what's the brand and number?
Click to expand...
Ngk 5599 usually. Just check though. Not cheap. But no doubt they are the right plugs. Don’t settle for platinum ones.
 
J

Jersey941

Cadet
Joined
Aug 8, 2018
Messages
6
I had a 1990 yamaha 200 that sat for 12 years. Fresh plugs and fresh gas and it ran fine for a few weeks but then ran sluggish. I then ran a separate 3 gal spare fuel tank to a y valve for emergency fuel. I ran 1 can of sea foam with 1 gal of fuel. I let it run for 5 min then sit for 5 min so the sea foam could sit in the Jets to clean them. Repeat that 3 times but run the throttle (in neutral of course) up and down so it cleans all the ports. The third time it'll spit, smoke and sputter as the old varnish spits out. Then it'll run great.
 
F

floater212

Petty Officer 2nd Class
Joined
Nov 27, 2013
Messages
146
update. replaced spark plugs, i guess it's been longer than I thought when I changed them last, they were ac delco's 41-993 with the fine tip, not so fine tip, they were burnt wider than a .045 gap, more like a .095 gap. just ordered new cap and rotor just to make sure thing are up-to-date!!! WAY TOO LONG SINCE LAST TUNE-UP! haha!
 
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