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05-15-2023, 07:11 AM #1
FF 200 after 50 hours on new rebuild
We rebuilt this FF 200 after a major failure on cylinder #6 about 18 months ago for my buddy's 20ft Shadow tunnel bass boat. Two new sleeves, all machine work, all new components. Rebuilt the carbs after this failure as well, along with new fuel hoses and filters. Even cleaned out the fuel tank and added a water separator.
Well yesterday on a straight run cruising about 45-50mph, 4,000 rpm or so it lost all power and stalled out. Cranked like it lost a few cylinders so we towed it back and pulled the heads. Although I told him which spark plugs to get when he went to service the boat, the auto parts store guy insisted he knew better with his "cross reference guide" It shouldn't have had Iridium's in it, but its too late now I guess lol.
After such a thorough rebuild, my buddy is obviously devastated with the time and money lost. No damage the the cylinder walls, so its repairable but still. Obviously top two went lean, but damn... Any insight on something like this? Mixes 40:1 and it sure seemed like plenty of oil everywhere when we just pulled it apart yesterday. No Hot spots on the rods, bearings look perfect. I guess I am just trying to wrap my head around what went wrong.
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05-15-2023, 11:15 AM #2
Is it a Carb motor?
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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05-15-2023, 11:21 AM #3Screaming And Flying!
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Usually when the electrode goes poof, you have either heat (from wrong plug?) or timing went too high and caused detonation. jm2cts...
83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
Rebuild thread:
http://www.screamandfly.com/showthre...-it&highlight=
http://www.screamandfly.com/showthre...cs.&highlight=
Videos
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05-15-2023, 11:46 AM #4
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05-15-2023, 11:59 AM #5
They do.
Looks like an overheat or too much timing or both.
I saw a 200carb run at 32deg timing for hella long.
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OnPad liked this post
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05-15-2023, 12:02 PM #6
My guesses
1. Black boxes removed?
2. Too much timing, too hot plugs
2. crappy fuel Get some BND automotive ACES fuel additive
3. Jetting to leanHydrostream dreamin
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05-15-2023, 12:04 PM #7
Some carbs have a lean spot aroung 4000rpm , the race carb 245hp motors were always rich to the point of almost 4 strokiing at that rpm to prevet lean burn down. First 225 Pro Max motors had an ECU recall for being lean at that rpm. Also water pressure and volume does a strang thing at that rpm due to poppet opening fully and the water pressure at that speed.
Check timing on all cyl and set max timing on highest cyl. Make sure carbs are real rich at that rpm, replace the poppet.
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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05-15-2023, 01:12 PM #8
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05-15-2023, 01:30 PM #9
That should be a lesson to everyone! no part throttle running! Always WOT!
1973 Viper - sold
1978 Viking - sold
1995 XB02
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05-15-2023, 01:33 PM #10
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05-15-2023, 01:35 PM #11
Those look like long reach plugs, heat range is one thing and it looks like a hot plug but also sticking the whole end of the plug into the chamber is a recipie for diaster... I would think he noticed that plug was much longer than the originals.
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KIRCHNER thanked for this post
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05-15-2023, 01:36 PM #12
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OnPad liked this post
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05-15-2023, 01:39 PM #13
Very possible
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05-15-2023, 03:14 PM #14
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rgsauger thanked for this post
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05-15-2023, 05:58 PM #155000 RPM
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That Trash Can Do It..
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FAST RALLY SPORT liked this post
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