fouled plugs on 92 Pro V 200

[Connley Ho]

My PRO V 200

Hey bud...huge issues this year with my 91 ProV
Change your plugs from the NGK BR9HS10 to Champion equivilent...I'm back navigating my Rocket again! The torque out of the hole and the over all power is 20yrs new again!
Give it a try....cheap enough fix!
Connley

[StevoH2O]

One other "heating" event occurred. Thremostats are still removed. Idling at the dock for 5 min and the heat buzzer goes off. I can see the water coming out of the outsource spout. Take off the cover and find the left bank of cylinders are at 109 degrees but the right side is running 181 to 184 degrees! Revved the engine to speed up the pump for a few seconds and shut it off. turned the key back to "on" without starting and the heat indicator was off. right bank was down to 153 degrees. No problems the rest of the day. Is this screaming water pump or what???

It was interesting to hear about the fouled plugs with only 1 of the 2 fuel pumps operating. Is there any good test for that? Or is it just replacing both and see what happens? What do those run? How was the engine performing at idle, mid range/acceleration, and top end when you were down to one out of two?

[99yam40]

Water cooled motors need the thermostats in place to add a restriction into the system to make the water circulate properly through all parts of the motor. Put new ones back in, check the PRV, and replace the water pump

[Connley Ho]

Hey there Stevo, the long and short of problems with my 91PRO V200 are rough idle, stalling out, sneezing, and it wouldn't go into gear without stalling.
I changed the fuel pumps first-no change. I cleaned all three carbs individually-no change. I checked the reed valves-all good. I changed the fuel hose and even took gas from a separate fresh source-no change. Finally took it to a mechanic and he identified two of the spark plug caps were arching. I changed all six plug caps (the screw in kind) it ran great..until I ran out of gas. Back to square one!!! Upon advice from some dude while looking at plugs, I swapped the NGK's for Champion's (i forgot to mention that I had gone through 4 sets of NGK plugs in this whole process) I've left out a lot of little things that I've done to get to the plugs, but the Champion plugs have my PRO V running like it was 20 years ago! Unbelievable torque and HP..in short, it's ALL BACK!
NGK does have a plug cap that are about 5bucks/cap up here in Canada. But my advice to you is to change the plug caps and the plugs to Champion.
Been there buddy!
Connley

[dilb1229]

In reference to how it ran with 1 of 2 fuel pumps working (at least that's what we think was going on): Mostly it ran OK, but it didn't have the 'oomph' that I remembered. This was at a time when I wasn't using the boat very often (it's a Malibu Flightcraft, set up for barefoot water skiing) and simply didn't have the time and schedule to get it out to the lake. Running so seldom, I had forgotten just how much acceleration it used to have. We kept attributing any problems to the fouled plugs, but was probably more likely fuel starvation or a combination of the two. Probably depends a great deal on just how bad the pump(s) fail.
Fuel pumps are pretty cheap. I think the last ones I got through a local dealer were under $50 each. Very easy to replace. Two bolts and a few cable ties each.
Meanwhile, rebuild or at least throughly clean the carbs. I wasn't a believer in this, but when I was having some problems several years before the fuel pump problems, people on this site kept saying to re-build. I had removed them and they 'looked' pristine, but continued to have problems. Finally, I broke down and got some kits and a friend and I rebuilt them. Back to running like new.

[Connley Ho]

You've just joined?
Why?
....That's how it's possible!

[StevoH2O]

Connley and Dilb:

Thanks for the suggestions. I have a Mastercraft BF 200 so it is rigged to be run like your FlightCraft, Dilb. After looking at the fuel lines out of the 2 pumps, I can see how the engine can be partially served by 1 functioning fuel pump. I have a unique issue where I can not settle into a speed between 25 and 32 MPH it is one or the other. Is that gas starvation from only 1 pump? Mechanic says if my carbs are fouled and floats stuck, I would have black smoke at restarts with a warm engine. Instead I have blue smoke which is excessive oil.

Does anyone know of an easy test for Fuel Pumps that I can do at home?

For $100 I can replace both but obviously 1 if not 2 are working. Hate to waste $100 if there is an easy test.

I will look into a new waterpump replacement along with thermostats for the temp issue.

Thanks all for continued coaching and sugestions.

StevoH2O

[Sydney Skier]

You could always switch to an electric fuel pump. Thats how mines rigged up and it works a treat. although you will need a regulator to be able to control the pressure.