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2002 JOHNSON 150'S - Eating Carb Bowls Yearly

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2002 JOHNSON 150'S - Eating Carb Bowls Yearly

Old 06-15-2019, 07:52 AM
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Default 2002 JOHNSON 150'S - Eating Carb Bowls Yearly

Motors have been maintained through 2 owners and have under 700 hours. Problem is the low grade plastic carb bowls that constantly warp and crack. Extremely frustrating and unfortunately a repower or power head upgrade is not in the budget. I've researched the heck out of this problem and know it is a known issue with these motors. I also know several guys that have them and they have had their share of problems too.

Is there anyone out there that has experienced the same problem with the Johnson 150's around the same year ? Has anyone ever found a source for a better quality fuel bowl, a fabricated bowl or come up with a fix that may last for more than a few months ? Saw a video with glass and sandpaper etc
I'm not particularly optimistic but figured throwing out there couldn't hurt. Thanks in advance.

Happy Father's Day to all of the Dad's out there
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Old 06-15-2019, 07:57 AM
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I have similar-aged motor (2005) and I have had to replace the plastic carb bowls twice, including just last season. For mine, there is no after-market metal option. Really sucks. I consider it a maintenance item now, unfortunately.

But having yours only last a few months seems unusual for sure. Does your motor sit for long periods of time in between use?
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Old 06-15-2019, 11:18 AM
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the plate of glass and sandpaper trick has been around since about 1986 during the early years of using "plastic" bowls.It is actually a nylon polymer.

Many of the warpage cases are due to over-torquing the fasteners which contributes to the warpage as the engine's underhood temperature changes.

single barrel carb bowls - Torque screws in sequence 18-24 in. Ibs.
2-barrel carb bowls - Torque screws in an "x" pattern to 24-36 in. Ibs.

If you use an inch-pound torque wrench or a torque screwdriver, you will notice that at those specifications there is not much effort required to reach the proper torque values.
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Old 06-15-2019, 12:58 PM
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Default didn't you say.....

Originally Posted by seahorse View Post
the plate of glass and sandpaper trick has been around since about 1986 during the early years of using "plastic" bowls.It is actually a nylon polymer.

Many of the warpage cases are due to over-torquing the fasteners which contributes to the warpage as the engine's underhood temperature changes.

single barrel carb bowls - Torque screws in sequence 18-24 in. Ibs.
2-barrel carb bowls - Torque screws in an "x" pattern to 24-36 in. Ibs.

If you use an inch-pound torque wrench or a torque screwdriver, you will notice that at those specifications there is not much effort required to reach the proper torque values.

.... there was somebody that was making them for sale out of aluminum? if not you, not sure where I read that.....

Are they all the same from 1986 on?
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Old 06-15-2019, 12:59 PM
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On that low of a torque value I don't use a clicker type torque wrench. All too easy to miss the clicking and blow right on past it. Beam type is better for that application.

99.999% of all mechanics will over torque a fastener if not using a calibrated torque wrench, and even then if not having been properly trained in the use thereof.

Then it is somebody else's fault.
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Old 06-15-2019, 01:08 PM
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Originally Posted by alloyboy View Post
On that low of a torque value I don't use a clicker type torque wrench. All too easy to miss the clicking and blow right on past it. Beam type is better for that application.

99.999% of all mechanics will over torque a fastener if not using a calibrated torque wrench, and even then if not having been properly trained in the use thereof.

Then it is somebody else's fault.

Not only that but I'll bet most used a Phillips screwdriver on the PoziDriv screws and complain that they "cam out" or strip out the + shaped slots. A shade-tree torque procedure for those Minlon carbs is to use only the thumb and 2 fingers on the screwdriver handle.

phillips-vs-pozidriv
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Old 06-17-2019, 09:06 AM
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Originally Posted by SweetD View Post
I have similar-aged motor (2005) and I have had to replace the plastic carb bowls twice, including just last season. For mine, there is no after-market metal option. Really sucks. I consider it a maintenance item now, unfortunately.

But having yours only last a few months seems unusual for sure. Does your motor sit for long periods of time in between use?
Motors are run 3 to 5 times a week in season.
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Old 06-17-2019, 09:08 AM
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Originally Posted by cfauvel View Post
.... there was somebody that was making them for sale out of aluminum? if not you, not sure where I read that.....

Are they all the same from 1986 on?
I seem to remember that somewhere, someone had fabricated aluminum replacements with great success but of course I can't remember where I got the info from.
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