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17.5hp single cylinder B&S intek, recent engine swap. After swap engine ran fine for about 20 minutes, then quit, unable to restart. Have since replaced the fuel filter, air filter, spark plug, has compression of 90si, replaced head gasket, valves adjusted to .003 for int and .005 exh, has fresh battery and gas, and is getting both fuel and spark. Was able to get it started but it only idles, moving throttle cable has no response and manually moving throttle gets no response, governor does not seem to move? Any suggestions? Thanks.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 78 Answers

SOURCE: craftsman riding lawnmower shuts off after 15 - 20 mins.

I have a Troy-Bilt push mower that does the same.

Try this - Run the mower until the point of quitting. Keep the hood up and be ready to remove the gas cap. As soon as you feel it start to stutter like it's going to quit, unscrew the gas cap and see if it comes back to life and doesn't quit.

If that works, then what is happening is that the gas in the carburetor bowl is getting depleted faster than the tank can provide it, possibly because of a clogged vent that's supposed to allow air back into the gas tank as gas is used.

You can try running with the gas cap not quite tight, to let some air seep in that way, but that's more prone to sloshing leaks. You could also try drilling a hole in the gas cap - about 3/16" is plenty, and stuffing a piece of natural sponge in to keep the gas in and dirt out. Synthetic sponge will deteriorate in gas.

Posted on Jun 09, 2009

smartr10U
  • 1305 Answers

SOURCE: Craftsman mower with 20hp B&S Intek won't start/run

That throttle cable issue sounds like it may be the culprit. the cable housing (the outer casing for the wire throttle cable) may not be anchored correctly. Which may be allowing you to move the throttle without any change at the butterfly control on the carb. make sure the cable housing is anchored at both ends.. by the throttle control and at the carb area.. That may be your problem... hope it is that simple...
K

Posted on Jul 23, 2009

  • 1 Answer

SOURCE: Popping out exhaust, loss of power, wont run at full throttle.

I had the same problem. If it is a 2 cylinder, remove the valve covers. On one side, the rocker arm had slipped off of the push rod. It was real loose. Put the rocker arm back on the push rod and tighten it down. I think this will do the trick.

Posted on Sep 01, 2009

backwoodsctr
  • 169 Answers

SOURCE: DLT 3000 Intek 18.5 Carb Float Stuck?

If it starts cold and runs for 10 min then it sounds like the fuel cap is not venting properly, try runnin engine with fuel cap loose and see if it dies. 9 times out of 10 the fuel cap is the culprit. Let me know

Posted on Nov 30, 2009

ginko
  • 19396 Answers

SOURCE: Husqvarna riding mower w/20 hp

Hi.

There is gas smell in the carburetor because the engine is not starting and carburetor is flooding.

As first thing ensure that there is spark, pull the spark plug wire and put the end near to engine block while cranking. You will see the spark. If there is no spark, check distribution coil and wires.

If there is spark, check if there is fuel pressure, if there is smell from carb, then the fuel pressure should be Ok.
Once you are sure that the pump is doing its job, and that there is pressure, check the carburetor settings. The mixture is probably too rich or too lean, and for that reason it is not igniting.
If it is not a matter of carburetor settings, then the carb must be taken apart to check carburetor filter.

To get parts and diagrams see: Outdoor Distributors - Lawn Mower Parts

Posted on Sep 26, 2010

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