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Best thing I ever hacked off a Briggs

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9NJoe

10-13-2007 12:20:14

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I recently replaced my woosie 12 horse engine in my garden tractor with a new 18 horse OHV engine. The thing was a bear to start, usually ran down the battery and required me to hook up the charger to get it going. It was driving me nuts and took a long time to figure out what the problem was. Turned out to be that darn fuel solenoid, when I turned on the key, there was a good 12 volts there and it clicked open. But, when cranking the engine, the battery voltage dropped enough to let the solenoid close. Best thing I ever did was to rip that thing off there and put in a screw to hold the bowl on. Now it starts right up every time like a charm!

Joe

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9NJoe

10-14-2007 11:19:41

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Re: Best thing I ever hacked off a Briggs in reply to 9NJoe, 10-13-2007 12:20:14

Hi Guys thanks to all for weighing in. I use a motorcycle battery on my tractor because it is home made. I figure if it can turn over a big V-twin, it should be able to crank over a one lunger briggs.

The old 12 horse I took off used to backfire like a shotgun every time I shut it off, never blew off the muffler.

Yep I do have an inline manual valve to shut off the gas when I am done for the day. Since I took the solenoid off, I have not had a problem starting her up and she has not backfired yet. I suspect as it gets carboned up a lil, it might backfire. I think most of this junk they put on these engines are to make them more PC rather than more reliable. I remember a few years ago, they wanted us to put catylitic converters on our lawnmowers. This stinks of something like that.

Joe

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Kentb of SWMO

10-14-2007 07:45:03

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Re: Best thing I ever hacked off a Briggs in reply to 9NJoe, 10-13-2007 12:20:14

You need a bigger battery. The 18 V-Twin OHV is a harder crank then the 12 HP flat head. You need at least a 250 cranking amp battery. Over 400 would be better. The ONLY L/G battery I used is one AUTO-ZONE stores sell. It has a 425 cold cranking amp rating.

Kent

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Gary from Muleshoe

10-13-2007 19:46:24

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Re: Best thing I ever hacked off a Briggs in reply to 9NJoe, 10-13-2007 12:20:14

I have a JD 112 with a 10hp Tecumseh, and Miller welder with a 12 hp Kohler, both back fire sometime when shutting down. Neither has blown off the muffler. For many years the fuel solenoid was never used on these engines so i don't see why people say it is so critical now??
Good luck with the new engine.

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10-15-2007 11:25:16

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Re: Best thing I ever hacked off a Briggs in reply to Gary from Muleshoe, 10-13-2007 19:46:24

Because the new engines run so lean and the tolerances on the engine are so close, and the engines run so much hotter that te old ones did, if you do not have the solenoid to shut off the fuel supply, it will keep pulling fule into the engine and try to keep on running, and it will wash the cylinder down with gas and cause premature engine failure, it works kinda like the anti-deiseling solenoids they used on cars several years ago, except they shut off the gas flow to the high speed jet instead of lowering the idle. And for you who say it will not blow a muffler apart, yes it will, I have seen it happen a lot of times in 30 years I been doing this. In fast even with the solenoid, if you try to shut the engine off at idle, it will backfire also.

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tom1

10-13-2007 18:44:36

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Re: Best thing I ever hacked off a Briggs in reply to 9NJoe, 10-13-2007 12:20:14

Backfires do not blow mufflers off, all the old briggs engines don't have that solenoid crap on them and when they back fire it is loud as heck and they've never blown the muffler off!!!

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cmonSTART

10-13-2007 19:03:47

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Re: Best thing I ever hacked off a Briggs in reply to tom1, 10-13-2007 18:44:36

They have their place, but I've taken them off before when they failed and didn't suffer any ill effects. Good luck with it. I have an old Bolens tractor which backfires like a shotgun every time. It's pretty funny.

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9NJoe

10-13-2007 16:05:26

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Re: Best thing I ever hacked off a Briggs in reply to 9NJoe, 10-13-2007 12:20:14

Well guys, I am sure not worried about the muffler blowing off on a backfire because I made it out of 1/8 wall DOM tubing welded to a tractor muffler. As far as the battery goes, when cranking the engine it drops to about 9 volts and I guess that is enough to close the solenoid. Now, I think it is reasonable for a battery to drop to 9 volts when cranking so I don't think I am going to change it out. Without the solenoid, it cranks right up on the second or third turn. Even when cold so the fuel solenoid is history! My old engine did not have that and a backfire never blew off that muffler either.

I have read quite a few posts here about problems with the solenoid so I stand by my recommendation to remove that sucker and save the grief.

Joe

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cmonSTART

10-13-2007 13:24:44

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Re: Best thing I ever hacked off a Briggs in reply to 9NJoe, 10-13-2007 12:20:14

While I agree that fuel solenoids can sometimes be a pain, I actually think you may have either an old battery that's on it's way out, or your battery is too small (too few CCA) to turn over your new larger engine. Those solenoids don't take many volts to actuate and if there's that much of a voltage drop, you may have a battery related issue.

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Bob

10-13-2007 13:09:11

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Re: Best thing I ever hacked off a Briggs in reply to 9NJoe, 10-13-2007 12:20:14

Wait 'til conditions are right at shutdown, and it backfires, and almost blows the muffler off! That'll make you rethink the situation!

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JoeK(WI)

10-14-2007 08:29:09

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Re: Best thing I ever hacked off a Briggs in reply to Bob, 10-13-2007 13:09:11

As I see it,the fuel cutoff solenoid serves 2 purposes.With the leaner burning modern engines it is"supposed" to immediately cut off fuel flow when key is switched off,or safety circuits activated.Secondly,as majority of mowers are stored inside residential garages,it prevents"dripping carb" which "can" vaporize a couple of gallons of gas into the surrounding air,creating an explosive atmosphere.IF you remove this expensive little widget,PLEASE install a manual inline fuel valve and USE IT.The potential of a mower tankful of gas vaporized in a garage/shed is equal to several sticks of dynamite.

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