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Multi-Problems (not my year)


mr_sma_jr's Avatar
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Join Date: Jan 2007
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05-10-09, 12:07 PM   #1  
Multi-Problems (not my year)

1. Yard Machine lawnmower 4.5HP, 21" cut = The bolt that holds down the air filter does no tighen up. I cleaned out the bottom, changed bolts, and still bad. Is the threads in the top of the gas tank or the carb assembly ???

2. Yard Machine lawnmower 3.75HP, 20" cut = This lawnmower starts fine but within a minute, it starts knocking and oinging, and the idle drops to low. New plug and air filter, changed out the gas and cleaned the carb - Still no go ???

3. Craftman Power Washer with Briggs & Straton 3.75HP = I push the primer bulb and it starts, then dies. It will continue to run so long as I push the primer bulb. Carb also ???

I had a three carbs off, cleaned... Cleaned plugs, air filters... Dumped out old gas and filled with new, and topped of oil levels - and they still are bad...

Any and all help is highly appreciated...

TY, J.R.

 
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05-10-09, 12:31 PM   #2  
1. Threads are in the tank.
2. What kind of engine is #2.
3. Below;
You need to install a new diaphram kit, it is Briggs part # 795083 or old # 495770 also Lowe's has a kit #5083 which has the same parts.

Here we go;
Remove air cleaner, there are 2 bolts that hold things together, one on the front of the tank 3/8" and one into the block 1/2", remove these bolts, now "slowly" slide the carb/tank off the intake tube and breather tube, now tilt the tank in to release the throttle linkage and waalaa the carb/tank is removed. Remove the 5 screws from the carb/tank remove carb(don't loose the spring) now spray all holes, cracks and crevases in both the carb and tank surface with brake parts cleaner, remove the main screen(looks like a thimble) with a small screwdriver pry out the main jet(carefully) and clean it, reinstall the jet, it can be difficult some times to get it to snap back in place(I use the rounded end of a screwdriver handle). Remove and clean the fuel pickup stem. Clean any junk/rust from the tank. Install the diaphram on the tank then the gasket(no goo or sealer) now carefully replace the carb(the spring will try to misalign the diaphram), tighten all screws a little at a time so as not to crimp the diaphram until they are all tight. Install the carb/tank in reverse order and you are done. If I missed something one of the real mechanics will correct me. Have a good one. Geo

 
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05-10-09, 03:42 PM   #3  
Thank you...

#1 - I did that once... All in pieces and used a toothpick to clean it out... I will try again... I also noticed that this was blowing smoke and cutting in/out... But cleared up... Maybe when I have it 1/2 apart, I'll put on a new head gasket...

#2 - Briggs & Straton (all 3 engine are B&S)

#3 - TY... I will replace the diaphram on it... Maybe I will do all 3 for S&G... I was going to swap one of the other tank/carb combo and see if that clear the problem - BUT, they all went south on me in the same week...

Thought I had bad gas at first...

Thanks again...

 
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05-10-09, 07:28 PM   #4  
If they are all the same type engines, replacing the diaphrams will probably fix them all, except the stripped threads on #1. Have a good one. Geo

 
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