Fouling plugs? Update 9/2/08

bassarama · #1 08-19-2008, 09:50 PM

Hey guys, long time no talk...

Finally I took the boat out for a shake down cruise and a little water skiing with the kids. For the first few runs the motor ran top shape topping of at 42 MPH on the GPS. After many stops and take offs and lots of idling, the motor started to idle a little rough and ended up losing top speed. I believe I fouled one plug and for a while it ran on 5 pistons only.
My hope is that I just fouled one plug due to all the excessive idling, after all, I pre-mix my gas at 40:1 ratio which may be a little to much.
When I first got the boat, (Fall of 2006) I did a decarburization using the “Seafoam” method and the motor ran perfectly fine for the entire 2007 season. Have any of you experienced problems similar to these, pre-mixing at 40:1 ratio?

Thanks

Joe

macojoe · #2 08-20-2008, 11:33 AM

I mix 50:1 never had a problem.

bassarama · #3 08-20-2008, 02:10 PM

Thank MJ

I'm going to do a compression test and a decarb job using seafoam. Will report back.

Thanks

bassarama · #4 08-26-2008, 08:33 PM

After repairing the ground cable for the starter motor, I proceeded with my plan of decarburization the motor with Seafoam. This is the second time I’ve done this since I bought the boat and once again I became amazed with the amount of white/grayish smoke it came out of that exhaust, that Seafoam stuff really works. I have a new set of Champions in and she’s running like a champ. All I need now is to find time to go fishing.

THEFERMANATOR · #5 08-26-2008, 09:59 PM

That 150 looper you have WILL foul plugs on 40:1 at low RPM's, not much you can do about it. The VRO ran them at 100:1-150:1 at idle to prevent plug fouling, but they would go to 50:1 at around 2000 RPM's and then to 40:1 above around 5000 RPM's. I would use a semi synthetic like PENNZOIL offers and mix it at 50:1. A regular dino oil at 50:1 will still foul plugs more frequently than a synthetic blend or a pure synthetic.

spareparts · #6 08-27-2008, 06:25 AM

i used to use 100-1 amsoil synthetic blend in an old cross flow. Amsoil designed it to replace a 50-1. It worked real good, the engine idled good, but it didn't smoke enough for me, I always wondered if I had mixed the oil with the gas, or had mixed it correctly. Engine never had any issues from running it.

steplift20 · #7 12-31-2008, 02:01 PM

hey mac is that your eye?

macojoe · #8 01-01-2009, 09:27 AM

only the shadow knows

Joker2 · #9 07-20-2011, 01:48 PM

Is there any way to tell how much oil your VRO is sending the engine, and can you adjust in any way besides disconnecting altogether and mixing manually?