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lanier92prostar
04-16-2008, 10:09 PM
I am about to do a tune up for my 92 prostar with the 240HP. I was curious as to what plug wires and spark plugs to get. Also, can I get the distributor and rotor at the auto parts store or do I need to go through a marine dealer? The last time, I got everything from my mastercraft dealer.

trunderw
04-16-2008, 10:12 PM
Gotta get the marine stuff to prevent any unwanted sparks in the engine compartment. As far as the spark plugs go, I just got the cheapies from advance auto parts since I replace them every year anyway. I think the gap is somewhere between 40 and 44. Standard 351 wires will reach fine but mine do say for marine use so likely there's some sort of extra insulation...and apparently a bit longer :)

stuartmcnair
04-16-2008, 10:34 PM
IIRC, the plug wires for the marine engine are a bit longer than the automotive counterparts. Call skidim or your local dealer and they will get you the right parts. Unless you know exactly what you are getting I would avoid an auto parts store.

lanier92prostar
04-16-2008, 11:14 PM
Thanks for the info. I will call either skidim or a dealer for the parts.

JimN
04-16-2008, 11:26 PM
IIRC, the gap is supposed to be .035". If the sticker is still on the valve cover, plug number, gap/dwell and timing are on it, too.

Timing advance is 10 BTDC, points gap is ~.016"-.024" and dwell is in the 26-34 range. That is, if it still has points.

lanier92prostar
04-16-2008, 11:34 PM
IIRC, the gap is supposed to be .035". If the sticker is still on the valve cover, plug number, gap/dwell and timing are on it, too.

Timing advance is 10 BTDC, points gap is ~.016"-.024" and dwell is in the 26-34 range. That is, if it still has points.
Thanks JIMN. I could not find the sticker tonight when I was looking for part numbers. And yes, I still have points. By the way, Happy Belated Birthday!!

JimN
04-17-2008, 12:34 AM
Thanks, yesterday was a bit taxing. :uglyhamme

trunderw
04-17-2008, 11:09 PM
So is the gap on my 1987 prostar supposed to be 35 as well? If that's the case I need to take all mine out and regap them...

lanier92prostar
04-17-2008, 11:12 PM
IIRC, the gap is supposed to be .035". If the sticker is still on the valve cover, plug number, gap/dwell and timing are on it, too.

Timing advance is 10 BTDC, points gap is ~.016"-.024" and dwell is in the 26-34 range. That is, if it still has points.
Thinking about replaicing the points with the electronic ignition. From looking at Brieod thread on that, it looks fairly simple. Do the dealers carry the parts, or do I need to go someplace like Skidim?

JimN
04-18-2008, 07:42 AM
What's the gap now?

TMCNo1
04-18-2008, 08:26 AM
I run Autolite #24's @ .035".

lanier92prostar
04-20-2008, 05:32 PM
Just took my boat out for the first time this year. Ran great, but I have water coming in from the stern somewhere. I wasn't able to take the floor out and look, but I am thinking is coming from 1 of 3 places: drive shaft, rudder and exhaust. I know how to fix the drive shaft, but but what are the solutions to the rudder and exhaust?

defender1009
04-20-2008, 06:46 PM
I spoke to the guys at Ski DIM about this last week.

According to them, it's .35 on the 351 (non-HO) if you're using points, and .45 if you replaced it with electronic ignition.

TMCNo1
04-21-2008, 11:11 AM
I spoke to the guys at Ski DIM about this last week.

According to them, it's .35 on the 351 (non-HO) if you're using points, and .45 if you replaced it with electronic ignition.

Sorry, but I just talked to Richard while ordering some stuff and he said, "Plug gap is .035" on 351's, any horsepower, with points or with electronic ignition including Pertronics and Prestolite Electronic Ignition conversions. The .045 gap is for plugs in a 351 with the PCM Pro Tech Electronic Ignition on the engine with the coil pack.

6ballsisall
04-21-2008, 11:13 AM
Just took my boat out for the first time this year. Ran great, but I have water coming in from the stern somewhere. I wasn't able to take the floor out and look, but I am thinking is coming from 1 of 3 places: drive shaft, rudder and exhaust. I know how to fix the drive shaft, but but what are the solutions to the rudder and exhaust?


Did you try greasing the zerks around the rudder shaft?