Trouble with Power Clear Briggs R Tek 141cc - Snowblower Forum : Snow Blower Forums
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post #1 of 17 Old 12-29-2013, 05:42 PM Thread Starter
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Trouble with Power Clear Briggs R Tek 141cc

I'm messing with my brother in law's Toro Power Clear with Briggs R Tek 141cc two stroke motor. Build date June 2008. Symptoms are it wants to rev very high in idle but when you put it under load and try to throw some snow it bogs and just spits a little bit of snow. I have completely taken the carb apart and cleaned passages with carb cleaner and compressed air and replaced the gaskets. Is there any adjustment to this carb besides the silver limiting screw in the pic below and bending the little tab on the mounting plate to increase butterfly return spring tension? It seems very simple. I guess the next step would be to replace the carb but they are around $100 (part 801396) and if that isn't the problem I will look like a dufus. I did check the compression and it is about 120 psi cold. I did verify I have the linkage hooked up correctly. I have focused mostly on the carb, but is there anything else I could be missing?

Carb looks like this


Rob

Last edited by rdlsz24; 12-29-2013 at 05:51 PM.
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post #2 of 17 Old 12-29-2013, 06:04 PM
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Welcome to the forum Rob! I'm not much of a carb guy, but someone will be along who will be able to help you out.


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Larry
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post #3 of 17 Old 12-29-2013, 06:26 PM
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Welcome, and did you by chance move the silver screw?

Or,

Has anyone else touched it before you got a hold of it?

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MTD....2 stage(modern 8.5 HP) not my favorite
Honda HS622 TA-B - acquired at an auction- nice machine for it's size.
Toro S-140- Picked it up on trash day... it runs, sort of.
Yamaha YS 240 TB "Ricky" latest Craigslist find- on the bench now.
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post #4 of 17 Old 12-29-2013, 09:02 PM
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Garage
Are the symptoms you describe the same as the reason you took it apart to clean or is there any difference in how it runs now compared to before you cleaned it

I know you said you checked the linkage but maybe when you did the governor you didn't get it back in the same hole it came out of and it's not pulling the throttle open as it needs to when you put it under load.
My best guess.


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post #5 of 17 Old 12-29-2013, 09:53 PM Thread Starter
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I did notice the screw had been turned in all the way. I tried it like that and turned it out some. And yes the reason I took it apart was because of this issue. After cleaning and reassembling there is no improvement. I thought that at first about the linkage but there is only 1 hole on either end so you can't mess it up

Rob
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post #6 of 17 Old 12-29-2013, 10:34 PM
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Does the governor move freely? Is there any oil seeping out of the out put shaft?

Scott
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post #7 of 17 Old 12-29-2013, 11:07 PM Thread Starter
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The gov does move freely. I thought for sure that was going to be the issue, that it would be hung up on the metal recoil housing. When the motor runs the vane lifts up, closing the butterfly in the carb. Seems backwards to me but from what I have read online that is how it should be.

How does the motor "know" it's supposed to increase rpms under load? These auto govs confuse me. Give me a throttle lever any day of the week.

I will have to check the output shaft.

Rob

Last edited by rdlsz24; 12-29-2013 at 11:14 PM.
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post #8 of 17 Old 12-30-2013, 05:10 AM
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Well, the vane works on airflow. If the the demanded throttle position is higher than the prescribed governor position, then it pulls the the throttle open. If on the other hand, it is lower, then the governor relaxes and the throttle closes accordingly.

I understand your frustration, turn the silver screw in all the way, and back it out one and half turns. It's not going to be right on 3600 rpm, but it will get you in the ball park. The position that was shown in the picture was just shy of self destructing wide open. And unless you have a tach, there is really no way to determine that.

That type of carb should set into another fixture that those plastic guides allow for the control of the engine. Unless you took the fixture apart, then things should bolt right in.

Garage:
MTD....2 stage(modern 8.5 HP) not my favorite
Honda HS622 TA-B - acquired at an auction- nice machine for it's size.
Toro S-140- Picked it up on trash day... it runs, sort of.
Yamaha YS 240 TB "Ricky" latest Craigslist find- on the bench now.
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post #9 of 17 Old 12-30-2013, 06:37 AM Thread Starter
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Is the 3600 rpm the max under load? What should idle rpm be? I do have a Tiny Tach I can hook up

Also, how much of a role does the governor return spring play in how these things run? The one on here looks worn out

Rob

Last edited by rdlsz24; 12-30-2013 at 09:02 AM.
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post #10 of 17 Old 12-30-2013, 09:56 AM
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Here is a link to a service manual that should help. Carb and governor linkage is on pages 27-29. I hope this helps.

http://dl.dropboxusercontent.com/u/1...SnowEngine.pdf
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