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Problem with a briggs and stratton


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#1 Nitris OFFLINE  

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Posted May 19, 2010 - 10:53 AM

I have a briggs and stratton 8 horse engine on a 1980 troy bilt tiller. Here's my problem, bought a new updraft carburetor for it last year tried to set it best I could but never seem to have gotton it right. Does anyone have instruction on how to adjust the settings to the correct flow on this carburetor? Thanks.

#2 mjodrey OFFLINE  

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Posted May 19, 2010 - 10:57 AM

:welcometogttalk:Nitris

#3 olcowhand OFFLINE  

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Posted May 19, 2010 - 11:16 AM

If it's the same as stock, and not an updated EPA type carb, the air screw initial should be about 1 1/2 to 2 turns out from bottom, and the main jet 1 1/2 turns from bottom. This is the starting point, and fine adjust after engine warms. Valve clearances out of whack or an intake air leak will make it impossible to smooth it out.

#4 Nitris OFFLINE  

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Posted May 19, 2010 - 11:51 AM

Thanks mjodrey and olcowhand, I got it running found the float stuck now will try and adjust with your directions, see if I can smooth it out.

#5 NUTNDUN OFFLINE  

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Posted May 19, 2010 - 01:51 PM

Welcome to the site and let us know how ya make out with your adjustments.

#6 Bolens 1000 OFFLINE  

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Posted May 19, 2010 - 02:32 PM

Welcome to the forum.:welcometogttalk:

Goodluck with your engine, and keep us posted....

#7 tractormike OFFLINE  

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Posted May 19, 2010 - 08:36 PM

:welcome: to the group Nitris! I think you will find this to be a friendly, helpful group. Sit a spell and look around. Glad to have you as a member!

#8 dstaggs OFFLINE  

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Posted May 19, 2010 - 08:55 PM

:welcome:

#9 nra1ifer OFFLINE  

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Posted May 19, 2010 - 09:14 PM

:welcometogttalk:

Welcome to the forum. I also look forward to hear of the outcome. Good luck!

#10 Nitris OFFLINE  

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Posted May 20, 2010 - 07:04 AM

Thank you all, and yes I find everyone here very helpful. Made adjustments, engine runs great. After about 20 minutes it starts cutting out again, make adjustments runs great for about 20 minutes. I think my adjustment screws are moving even with the springs behind them. What do you guys think?

#11 tractormike OFFLINE  

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Posted May 20, 2010 - 07:50 AM

Two things for you to try. You could stretch out the springs to increase the tension and that may hold the settings. Second thing to try, when it is running well shut it off and count how many turns it takes to bottom the screws out and then turn them back to where they were. When it starts running poorly again shut it off, tighten the scews down and see if they take the same amount to tighten them. This may help tell you if the screws are turning on there own. Some engines this will be hard to compare though because a slight turn in the screw setting can make a big difference in how it runs. You might need to note how the slot in the screw is and compare it to when the engine starts running poorly again. Good luck! Mike

#12 Nitris OFFLINE  

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Posted May 20, 2010 - 08:37 AM

Thanks Mike I'll try that next.

#13 murphy OFFLINE  

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Posted May 20, 2010 - 01:59 PM

My first thought would be, something is floating around in tank. I have had that happen before, and took 2 or 3 times before getting it out.

#14 jdslednut ONLINE  

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Posted May 21, 2010 - 02:26 PM

A couple of other things to look at: Did you put on new fuel line? Is the fuel line very close to the muffler (heat)? Is the fuel cap vent clear? Just curious if there may be chance of a partial vapor lock or lack of fuel supply. Good luck!

#15 Nitris OFFLINE  

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Posted May 23, 2010 - 07:45 AM

A couple of other things to look at: Did you put on new fuel line? Is the fuel line very close to the muffler (heat)? Is the fuel cap vent clear? Just curious if there may be chance of a partial vapor lock or lack of fuel supply. Good luck!


I'm going to replace the fuel line and filter, see if this will stop the issues.




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