Model #40H777-0241-E1 BRIGGS & STRATTON Engine

  • Cylinder/crankshaft
    3 Results
  • Cylinder-head/carburetor
    3 Results
  • Short Block / Motor-starter
    3 Results
Find part by diagram >

Question and Answers

Q:

Briggs and Stratton 2 cylinder engine misfires 917276051 Craftsman Tractor

A:

Thanks for the inquiry and for using SearsPartsDirect.com.
Sorry to hear of the issue you're having with the twin cylinder Briggs. I know how frustrating it is to have these types of issues.

Since you've already replaced the plugs and checked for spark with no avail, I recommend accessing the ignition coil. Remove the kill wire from the ignition coil. The kill wire is the small wire going to the ignition coil. Once it is removed, recheck for spark. If you do not have spark, check the magnet on the flywheel to make sure it's not rusted and is secure. If it's slightly rusted, give a slight sanding to remove surface rust. From there, also check the air gap. The coil on the engine has to have an air gap of .010" to .012" between the coil and the magnet on the flywheel.
If all this checks out and you still don't have spark, I would recommend replacing the coil. The part number for the coil is 592846.
For convenience, I have provided a blue link below that you may click on to be directed to the SearsParts site to view and purchase when needed.

Ignition Coil for Briggs 40H777-0241-E1

Hope this helps and thanks for using SearsPartsDirect.com. We appreciate your business. 

Read More
Jeff Wallace Sr -
Sears Technician
June 17, 2014
A:

Thanks for the reply. I do have spark, but it is still misfiring. It pops at the carburetor, like a valve is open when it fires or the timing for that cylinder is off or something. If I disconnect that coil wire it doesn't pop out the carb and the other cylinder seems to be ok.

Read More
Darryl -
June 21, 2014
A:

Thanks for the reply. I do have spark, but it is still misfiring. It pops at the carburetor, like a valve is open when it fires or the timing for that cylinder is off or something. If I disconnect that coil wire it doesn't pop out the carb and the other cylinder seems to be ok.

Read More
Darryl -
June 21, 2014
A:

Usually when the engine backfires through the carburetor when starting, something is wrong in the valve and rocker arm area.
To adjust the valves on the engine, remove the 4 screws in the valve cover and remove the valve cover. Remove the spark plug(s) from the engine.
Put a clean small screwdriver into the spark plug opening so you can tell when the piston is at the top of the stroke. 
Rotate the flywheel until the piston is at top dead center and neither valve has any pressure on them. The push rods will be loose in the rocker arm. If one push rod has pressure on it, rotate the engine again and when it comes back to the top of the stroke neither push rod should have any pressure.
Use a feeler gauge to measure the clearance between the end of the push rod and the rocker arm. 
The clearance for both the intake and exhaust valves should be between .004" to .006". 
If adjustment is required, loosen the allen set screw in the center of the nut on the rocker arm and adjust the nut to obtain the proper clearance. When you are through adjusting the clearance, tighten the set screw tight.

Read More
Jeff Wallace Sr -
Sears Technician
June 23, 2014
A:

The gap was only .007-.008. I adjusted the gap on the side that misfires and it still backfires at the carburetor. The valve springs seem very weak to me. Is that normal? Could there be something holding a valve open?

Read More
Darryl -
June 27, 2014
A:

Weak valve springs can cause engine misfires, and that may be your issue. To help you out with inspecting the valves and springs, I have attached a very informative article from Briggs. Just keep in mind that the exhaust valve spring may use thicker wire than the intake valve spring.

Valve Servicing

Read More
Jeff Wallace Sr -
Sears Technician
June 28, 2014
See more answers
Q:

i have a 22.0 hp dose it have afuel pump on it 917275970 Craftsman Tractor

A:

Thanks for the inquiry and for using SearsPartsDirect.com.
Based upon tractor model 917275970, I see this tractor is equipped with a Briggs & Stratton engine with model 40H777-0241-E1. 
Based upon that engine model, I do see it uses a fuel pump. The part number is 808656. For convenience, I have included a blue link below that you may click on to be directed to the SearsParts site so you can view and purchase the fuel pump if needed.

Fuel Pump for Model 40H777-0241-E1

Hope this helps and thanks for using SearsPartsDirect.com. 

Read More
Jeff Wallace Sr -
Sears Technician
April 23, 2014
Q:

Regulator and alternator coil 917276221 Craftsman Garden tractor

A:

Thank You for choosing Sears PartsDirect.com. I regret to hear that you are having issues with your mower and do understand your frustration. Glad to help out. Im looking at your model number 917276221 and engine model number 40H777-0241-E1. The alternator coil is located at the top of the engine. You will need to remove the rotating screen and flywheel fan and the flywheel. You will need a flywheel puller to remove the flywheel. The regulator will be mounted to the side of the engine. Here is a link for some videosthat will help testing. I have included a link to our PartsDirect page where you can purchase the part you need to complete your repair. Just click the blue link above to be taken to the page. If you have further questions please resubmit your question for further information.

 
Thank you for choosing Sears PartsDirect.com. 

Read More
Sherman_G_Wallace -
Sears Technician
April 10, 2014