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Float adjustment for a 1995 150hp Johnson

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Float adjustment for a 1995 150hp Johnson

Old 06-20-2019, 06:13 PM
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Unhappy Float adjustment for a 1995 150hp Johnson

Does anyone know the float height, degree pitch and float drop specs for this motor. I rebuilt my carbs and adjusted the float parallel with the housing when upside down. Arghhh, wrong move. Boggs down to nothing when I try to go to WOT. Now learn about heights degrees and drops but don't know where to find the specs for 95 150hp Johnson. Thanks in advance!
Old 06-20-2019, 06:30 PM
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that IS about it....most, actually do a little less than even with the bowl's edge.

Now do you have one of the bowls off right now? If so remove one of the float's seat. Does it have a raised edge? Did you use a nylon washer under the seat so that it goes Float Seat, Nylon Washer, raised edge?

If so remove the nylon washer....the kits provide the washer in case you don't have the raised lip....ask me how I know.....ok don't.....just know that having the washer and the raised edge will not allow enough fuel into the bowl if you set the float height as normal.
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Old 06-20-2019, 06:33 PM
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Quilty, yes I installed the washer under the seat because it was there. Thought the last guy overlooked it. I'll bite though.. how do you know? Been down the same path?
Old 06-20-2019, 06:34 PM
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Originally Posted by JCBDUX View Post
Quilty, yes I installed the washer under the seat because it was there. Thought the last guy overlooked it. I'll bite though.. how do you know? Been down the same path?
Those washers need to be removed.
Old 06-20-2019, 06:43 PM
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R'gr that. It's late now tonight. Will do tomorrow and report back. Thx
Old 06-20-2019, 07:37 PM
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Originally Posted by JCBDUX View Post
I'll bite though.. how do you know? Been down the same path?
installed the washer, set the floats and got a lean sneeze at idle that was worse than I started from.
Old 06-26-2019, 04:26 PM
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Well, finally was able to get back to my carbs... Kids!! Anyway, it improved. Instead of running entirely bogged down at WOT it now Cycles from full rpms to bogged down, then back up again. When I removed the nylon washer the float height became as suggested, slightly below level, which gives me about a 7/8" drop from float being closed to all the way open. Any other technical suggestions?

JCB
Old 06-26-2019, 07:43 PM
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Closer :-)


How is from idle to the rpm where you start having troubles and at what rpm do your troubles start?
Old 06-26-2019, 07:58 PM
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The setting according to the shop manual for the carb is:

With the carb body inverted the float must be level with the gasket surface +/- 1/32 inch.

Adjust the float drop with the carb body in the normal position. The drop dimension to the bottom od the float should be between 11/16 to 1 1/8 inch.
Old 06-26-2019, 07:59 PM
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Good question. I'm throttling it at the engine. If I give it a quick snap boost she signs like she used to. If i push it up and hold is where it will spin well for a few seconds then it cycles down for 5-10 seconds then boosts back up. I'd venture to says it begins to suck from 2000rpm and up
Old 06-26-2019, 08:04 PM
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Thanks MudRunner
Old 06-26-2019, 08:05 PM
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Originally Posted by JCBDUX View Post
Good question. I'm throttling it at the engine. If I give it a quick snap boost she signs like she used to. If i push it up and hold is where it will spin well for a few seconds then it cycles down for 5-10 seconds then boosts back up. I'd venture to says it begins to suck from 2000rpm and up
I assume you are doing that on water muffs then?

pushing the throttle plates open at the engine via the butterflies' linkage is not going to advance the motor 's timing properly.

You have to do it with the throttle handle at the control for the advance linkage to kick in.

and don't throttle up pass 2000 - 2500 rpm on water muffs...it is not good.

Try again tomorrow via the throttle handle...maybe a video too
Old 06-26-2019, 09:45 PM
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Testing the engine acceleration and adjusting the carbs has to be done in the water. On a flusher there is no exhaust backpressure for which the motor is calibrated for and it will run lean and often idle at a higher rpm.
Old 06-27-2019, 05:43 AM
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Interesting, interesting.. Before changing the gaskets and needle it was never an issue testing it on the muffs before. I don't do it long. I know it the hum it used to have well and its now deficient. Will calibrate float tonight and report back. Thx all
Old 06-27-2019, 06:33 AM
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8. Invert the carburetor and place a new float bowl gasket onto the
carburetor main body. With the carburetor inverted, check the float closed
height. The top of the float must be level with the bowl gasket give or take
1132 in. (0.08 mm). Do not exert pressure on the needle valve when making
adjustments. Bend the float arm to make closed height adjustments.

9. Turn the carburetor upright and check the float drop. Measure from
the bowl gasket to the bottom of the float assembly with a machinist scale or
ruler; the float drop should be between 11116-1 118 in. (17-28 mm). Bend the
tab on the float next to the needle seat for drop height adjustment.

10. Lower the float bowl over the float and onto the carburetor main
body. Note the float bowl does not fit flush on the carburetor main body
at this time. The rubber gasket on the nozzle well has to be slightly
compressed by squeezing the float bowl and carburetor base together.
Install the 4 self-tapping Phillips head screws. Tighten the 4 screws in a
crossing pattern to 18-24 inch Ibs. (2-3 Nm).


Old 06-27-2019, 06:44 AM
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^^^^ I believe he has plastic bowls like mine...the float is on the bowl......^^^^
Old 06-30-2019, 07:34 PM
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Silver Bullet- that was exactly what I was looking for!

Full disclosure, this problem started off as a fuel pump issue. Engine was starving for fuel at WOT and only was I could satisfy it was to pump the ball during flight. Had the fuel pump rebuild, twice, (no charge second time) and it no longer starved the motor for fuel. In the meantime, I noticed significant warping on my carbs bowls and it was weeping fuel. So I ordered new bowls and gaskets wondering if that was compound the fuel pump issue. The gasket kit included a full carb rebuild so I replaced my set screws. needles, pins, etc. When I put that nylon washer under the set screw (didn't originally have it) it offset the float a little so I just bent it down, of course pressure right on the needle. The motor no longer is starved from fuel, but I've had the obvious problems since.

I think you guys have me on the right track. Each adjustment has made it a little better each time. S-Bullet, I used a micrometer on the last adjustment, some of the drop on the floats was only 15mm. Most were 17mm but I set them all at 23mm. Seemed like a nice halfway point to the allotted tolerances However, at this point I don't know if I'm good enough on my close float position at .08mm. Pretty tough to measure, and.... again, I didn't read step 8 close enough. I eyeballed float level, gasket out. with a pub hair gap between the float and carb body, but level. Still better, but it's no the hum she used had and it doesn't go straight up on its rpms. Still slightly sluggish- almost like it would like to back fire but not quite enough to do so. Anyway, wanted to update you on the progress and give you full disclosure incase there's anything that jumps out at you guys for me to consider further. Thanks for all the input.

JCB
Old 07-02-2019, 05:46 AM
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Well, I spent a couple hours last nigh doing the dead nuts adjustments. I even use a torch tip cleaner to rake through the high speed jets just to make sure there wasn't any tough varnish build ups

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Still having problems. On the original, original time I worked on the carbs I wasn't aware the the carb bowls wouldn't fit snug as indicated in step #10 so I tapped the jets down thinking that was causing the indifference, but since have raised the jet stems back up. My mechanic, who has been stumped by much of this as well, just found out from another mechanic that this can create too much of an air leak and be a problem. Those buggers are set in there snug. Is this true?
Old 06-26-2020, 04:58 PM
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Hey JCB. I just stumbled on this thread from a year ago and I'm having a nearly the exact identical problem with my 150 Ocean Pro. Did you ever resolve your issue? What was the problem?
Old 06-26-2020, 07:59 PM
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Originally Posted by polo35m View Post
Hey JCB. I just stumbled on this thread from a year ago and I'm having a nearly the exact identical problem with my 150 Ocean Pro. Did you ever resolve your issue? What was the problem?
Float reservoir adjustment for a 1995 150hp Johnson

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