Briggs & Stratton 42A707 starting issues

12 years ago

Hi all!, this is my first time posting on this site. I hope someone can help me.

Briggs & Stratton Model - 42A707, Type - 2238 E1, Code - 9707115B

I have just inheaited a starting problem for a couple of hundred bucks and I would like to repair it quickly. I have the same starting issues as a posting by "ladysasha" on 6-1-09. I have a new battery, starter, and good cables. The motor will turn over very slowly or not at all. It usually only spins until compression if created in one of the cylinders. I am going to try and adjust the valves and see where that takes me. Can anyone send me the valve specs, and a link to a exploded view of the engine. Hopefully this will take care of the starter issues, but I have another problem.

I can jump the starter from another battery (truck battery) and use the key and make the starter spin the engine over very well (two batteries, one starter). However, the engine acts like it is trying to start, (as if it were flooded out). then I release the choke and it will almost start, then nothing happens. Kind of acting like a car when it is out of time. It is getting gas, smoke from the exhaust, spark plugs warm up, heads warm up, but the engine just will not catch and start. Does briggs still use the aluminum ket in the flywheel, I new that this was a problem years age, but I am not into the newer engines like this one. I like the older ones from the 60's and 70's. The plugs are new B&S plugs, the engine is getting gas, the plugs are firing, the air cleaner is off. Maybe the throttle assembly is off adjustment or something. I do not have a manual to repair this engine and adjust the linkages to the carb or govenor. Can anyone direct me to a (free) repair manual site where I can get this information.

Thanks

Ken

989-326-0327

klm.inc@charter.net

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Comments (2)

mownie
12 years ago
My suspicion is that the carburetor needs a thorough cleaning.
As a test to determine if the engine is being deprived of sufficient fuel to run, do the following.
With the air cleaner removed, spray about a 2 second burst of CARBURETOR CLEANER (DO NOT use ether starting fluid) directly into the open throat of the carb.
Immediately try to start the engine.
If the engine seems to eagerly want to run.....for about 2 seconds before dying, there is a problem in the carburetor (most likely clogged jets).
Try this and if you get a positive response, we will need to proceed to carb cleaout (a basic clean out can be done without removing the carb from engine).
Post back and we will go from there.
Did you receive the manuals I sent?
chysm60
Original Author
12 years ago
Hi again! I have repaired the problem mostly. There were multiple problems, and one still exist.

First, the flywheel key was sheared. I found that the flywheel was not torqued down properely. When I removed it, there was also a build-up of gunk on the tappered shaft and the flywheel tapper. I cleaned it all and installed a new key.

Second, the starter had one negative brush wire burned off. I purchased a new set of brushes for $18 and this took care of the problem.

It starts now, stil a little hard (turns over hard) but it runs very nice. There is some lifter/valve clatter, very little, but I know that it is to much. Later I will grind the valves and reset the valve lash. I wish they were adjustable like the older kohlers are.

I want to thank everyone for the advice and for the exploded view of the engine and repair manual! I made copies and put them into a folder for future use.

Thanks everyone!

Ken
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