30+ year old briggs 4 horse on tiller

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John *.?-!.* cub owner
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30+ year old briggs 4 horse on tiller

Postby John *.?-!.* cub owner » Fri Nov 20, 2015 12:31 pm

I have 2 questions.

1 - recoil starter, ball bearing type. It occasionally, but getting more frequent, will while running make a squealing noise and the rope will unwind an inch or two. Will a drop or two of turbine oil where the outer shell goes into the ball bearing housing to lubricate that bushing help it?

2 - pointless ignition, it will on occasion kick back severely. Not all the time, but on an average of 1 out of 3 times. I know of no way to set the timing, but did notice the legs of the coil assembly were very close to the flywheel compared to the older point type engines I am familiar with. .005 in (.15mm) by my feeler gauge. Could that be causing it to fire too soon and kickback?
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Re: 30+ year old briggs 4 horse on tiller

Postby Eugene » Fri Nov 20, 2015 1:35 pm

The Briggs starter drive or starter drive assembly is still available at your auto parts store. There are currently 4 different starter drive or starter clutches listed. Take your old one in for comparison.

I don't know on the ignition/kick back problem.

Edit. Thinking. If you replace the starter drive/clutch go ahead and pull the flywheel. Check the woodruff key to see it's not partially sheared, even just a bit.
I have an excuse. CRS.

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John *.?-!.* cub owner
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Re: 30+ year old briggs 4 horse on tiller

Postby John *.?-!.* cub owner » Fri Nov 20, 2015 6:42 pm

Looks like I will definitely be replacing The ball bearing starter assembly, when I took the screws out that held the screen on the flywheel the ratchet assembly fell apart. I did not even bother to look for the balls out of it, I will just sweep them up when I am done. No sign of anything wrong with the flywheel key, not even a mark on it, so I can forget about that being the kickback problem.
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Re: 30+ year old briggs 4 horse on tiller

Postby SONNY » Fri Nov 20, 2015 8:09 pm

John!!---they told me to set my ign. to 10 thousands on the legs!---turn the engine over so its sitting on the magnets and slide a business card under the legs and tighten down, remove card and you should be close!---I have a b & s 6 hp on my weed eater and it will kick 1 out 50 times and has new ignition modual on it!---just a suggestion!---there is no other external setting on the sealed units! thanks; sonny
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Re: 30+ year old briggs 4 horse on tiller

Postby Eugene » Fri Nov 20, 2015 8:10 pm

Take two sheets of copy paper. Set the paper on the flywheel under the magneto pickup. Loosen the pickup screws and let the pickup get pulled into the magnets on the flywheel. Then try to wiggle the pickup clockwise, the fly wheel rotation direction. Tighten down the pickup screws.

A sheet of copy paper is around .004" to .005". This should elevate the pickup.

If you can move the pickup just a bit, even a smidgen, perhaps 1 degree in the spark of crankshaft rotation, this may help with the kickback when starting.

Edit. Reading some of my small engine books. Says the air gap may be incorrect, the gap between the module and the flywheel magnets. No where in the books does it say what the air gap should be.
I have an excuse. CRS.

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Re: 30+ year old briggs 4 horse on tiller

Postby twotone » Fri Nov 20, 2015 8:35 pm

We always used an index card to set the air gap.
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Re: 30+ year old briggs 4 horse on tiller

Postby Eugene » Fri Nov 20, 2015 9:19 pm

http://www.briggsandstratton.com/eu/en/ ... e-ignition

Above link has two different air gaps.
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Re: 30+ year old briggs 4 horse on tiller

Postby Jim Becker » Fri Nov 20, 2015 11:32 pm

Eugene wrote:http://www.briggsandstratton.com/eu/en/support/faqs/replacing-the-ignition

Above link has two different air gaps.

That page has a pointer to an "Engine Check Chart" that has the proper gap by engine model number.

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Re: 30+ year old briggs 4 horse on tiller

Postby danovercash » Fri Nov 20, 2015 11:37 pm

I need to replace or service all of my Briggs starter clutches. Thinking open them up, clean real good, then coat with PTFE. Spray some behind the plastic spring hub too. Spray Teflon is a good thing.
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Re: 30+ year old briggs 4 horse on tiller

Postby Eugene » Sat Nov 21, 2015 9:20 am

NAPA lists the common starter clutch for $16.49. Part number 703451. Might be less expensive from other sources.

I haven't purchased the starter clutch in many years. Use to pay around $4- at the auto parts store for one. For $16.49 plus tax I would take the clutch apart and see if I could clean it up.
I have an excuse. CRS.

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John *.?-!.* cub owner
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Re: 30+ year old briggs 4 horse on tiller

Postby John *.?-!.* cub owner » Sat Nov 21, 2015 10:58 am

according to parts list my starter clutch number is 399671. Best price I found once shipping was factored in was Amazon of $21.39. My flywheel key appeared to be ok, but I ordered a package of replacements any way along with the clutch.

I see every model number on the chart Jim pointed to has 2 numbers in the armature setting, I assume (bad thing, I know) those are minimum-maximum numbers. With mine being only .005, it is tighter than the minimum, a .006 would not go in. That was tested with the magnet directly under the armature. guess that while flywheel is of might be a good time to check for up and down play in crankshaft bushing.
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Re: 30+ year old briggs 4 horse on tiller

Postby Jim Becker » Sat Nov 21, 2015 11:18 am

John *.?-!.* cub owner wrote:I see every model number on the chart Jim pointed to has 2 numbers in the armature setting, I assume (bad thing, I know) those are minimum-maximum numbers. . . .

That is my interpretation as well. The first page that Eugene pointed at strongly suggested that was the case.

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Re: 30+ year old briggs 4 horse on tiller

Postby Eugene » Sat Nov 21, 2015 11:20 am

John *.?-!.* cub owner wrote:My starter clutch number is 399671.
Part number 399671 is the same as NAPA and Federated Auto Parts part number 703451.
I have an excuse. CRS.


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