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Lawnmower runs extremely rich after carb rebuild?

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The jets need setting up. As a guide, screw the tickover jet in completely and unscrew by 2 1/4 turns. You will be somewhere near it.

Posted on May 05, 2017


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I have a cub cadet lawnmower and gas is coming out of exhaust

Which model and when did the problem start? It is either running extremely rich (carb or timing maybe) or you have an exhaust valve leak. Either way, it should seriously affect performance. Is it running well otherwise? Does its idle fluctuate wildly? Does it keep happening even after it is warmed up? Also, make sure you are actually seeing fuel and not water from condensation.

Jul 10, 2018 | Cub Cadet Garden

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Craftman silver lawnmower starts runs 30 seconds stop mt gas tank refilled cheched oil cleaned air filter whats next

Sounds like you have an issue with carb main jet. Latter needs cleaning or carb rebuild or replacement.

Sep 05, 2017 | Garden

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Carb is running rich and dont want to rebuild the carb 4bbl dynaflow

you should be able to adjust the idle screw a quarter turn at a time until it runs

Mar 27, 2012 | Cars & Trucks

1 Answer

I have 1994 fxdl the plugs keep getting caked with black soot and fauling out which makes me believe its running to rich, its also backfiring,thru carb and exhaust, i want to know how to lean it out

Before I can tell you how to lean your carburetor out, I need to know what kind of carb you have. But, there are other possible causes for your problem. The factory usually jets the original Keihin CV carb too lean to meet EPA emission requirements. The most probable cause is running the enricher too long while warming the engine up. The enricher on any carburetor provides an extremely rich mixture. So rich that it will foul plugs if allowed to run for too long. You should only use the enricher long enough to warm the engine to the point to where you can keep the engine running with the throttle grip. Once the engine will run with the throttle grip, simply idle the engine up and use the throttle grip lock to hold the throttle at this setting and push the enricher knob in. Other causes could be that the needle is not seating properly and allowing the carb to load up with fuel. If this is the case, you should have noticed that the engine is idling extremely rich and poorly. In this case, you'll have to at least drop the float bowl off and replace the needle and check the float setting with the new needle. The Kiehin CV must be positioned on an angle to set the float properly. If you still have reason to think that you need to change your carb's jetting, re-post telling me exactly what carb is on your engine.

Good Luck

Jul 06, 2011 | Harley Davidson FXDL Dyna Low Rider...

1 Answer

Apparent carb problem.

carb sync problem.. check online for some really easy to make carb sync tools from home..

the tubing with liquid fill worked well for me


Sep 17, 2009 | 1984 Yamaha FJ 1100

1 Answer

Lawnmower cuts out on fast idle + runs rough

REBUIld carb it is dirty jet is clogged

May 25, 2009 | Echo Garden

1 Answer

1985 300 runs to rich

Is it a Holly carburator? If it is and the choke operating correctly, then you have a warped metering plate in the carb allowing too much gas to go into the engine. Rebuild the carb abd check the plates for warpage before reinstalling them. There is also a power valve in the carburator that some times goes bad. Good Luck,

Apr 12, 2009 | 1985 Ford F150

1 Answer

Gmc vandura 1996, 3500 running rich

There could be all kinds of reasons your vehicle runs rich. It should be fuel injected not carborated. It could have a bad injector, bad air filter, o2 sensors etc. Have it scaned for the reason.

May 18, 2008 | 1987 GMC VanDura

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