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Tool Talk Discussion Forum

Compression relief-small engine

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Don L C

02-25-2006 18:01:29




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I am old and disabled...I need to be able to start small engines, like on pressure washer (Honda);Lawn mower (Briggs):rotatiller(Brigs)....

I have a snow blower 8HP with 110v starter works great...but I can not get this starter for the smaller engines....

Do you think I could bore and tap a 1/8"pipe niple with a small ball valve I could adjust some compression release until it is running then turn valae off....what do you think?

Don SW Ohio

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woodache

02-26-2006 17:36:32




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 Why go to all the trouble When Re: Compression rel in reply to Don L C, 02-25-2006 18:01:29  
Why go to all the trouble When if you can easly access
the spark plug, just remove a squrit of starting fluid then pull should start on first pull.
I too am disabled (nursing a broken back) but I still got to split wood in the winter at below zero temps and have a 9 hp Hyd splitter no electric start and at "0" or less just plain pulls hard. But a squrit in the cyl no more than 2 pulls on the rope off se goes!;))

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Jim@concordfarms.

02-26-2006 15:07:59




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 Re: Compression relief-small engine in reply to Don L C, 02-25-2006 18:01:29  
Take the head off and take it to a machine shop. They can put it in a milling machine and mill away a small area of the cooling fins an inch or so from the spark plug. After milling away the fins, drill and tap the head thru with a 1/8" NTP pipe tap. Then thread a small quarter turn valve into the tapped hole and you'll have a compression relief like the 2 cyl. JD tractors. Jim.



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jeffcat

02-26-2006 00:21:47




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 Re: Compression relief-small engine in reply to Don L C, 02-25-2006 18:01:29  
Check with anyone who collects spark plugs. They used to make "Primmer" plugs for just what you want. There is someone who advertisses on Gravely and small engine sites to adapt new plugs to old plug sizes. It is kind of an addapter collar for you plug. The guy might make these too. This might be better idea. A "REAL" DSP or de stroke port, is cast into the side of the cylinder and allows only about 2/3 of the compression stroke to occure. Most heads are not thick enough to allow the drill and tap deal. Some old engines had internal linkage to partial open the exhaust valve to allow you to get it spinnin. I would fire but with very little power till you reset the linkage. Starters can be put on darn near any Brigs or Tacumsy made if you can go for about $80-100 for the flywheel and add about 125 for the starter. Find your local junkyard and have a look around. Township junk days are PRIME time for this stuff. Lots of machines to pick from. PS Vertical and Horizontal machines take different flywheels. Jeffcat

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Arizona Bob

02-25-2006 21:35:47




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 Re: Compression relief-small engine in reply to Don L C, 02-25-2006 18:01:29  
The pulley and foot pedal adaptation was in Farm Show newpaper. The Drill thing can be purchased through Northern Tools.



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Bob

02-25-2006 20:21:46




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 Re: Compression relief-small engine in reply to Don L C, 02-25-2006 18:01:29  
Somewhere, back in another century, Popular Science or Popular Mechanics had plans to build a starter using a 1/2" drill, with a cone-shaped piece of oak on a mandrel chucked in the drill.

You jammed the piece of oak in the exposed cup for the rope start, that was attached to the flywheel, and pulled the trigger on the drill.

It should be possible to rig up something like that.



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IA Roy

02-25-2006 19:58:54




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 Re: Compression relief-small engine in reply to Don L C, 02-25-2006 18:01:29  
Somewhere I saw that someone rigged up a pulley and foot pedal and longer starter rope for a lawnmower that allowed the operator to use a foot operated kick starter. The leg muscles are so much stronger than the arm muscles, this is something I will try when I get into your situation. You notice I said when, not if. I think that is the same motion used to start the old Maytag washer engies.



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KEB

02-25-2006 19:12:32




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 Re: Compression relief-small engine in reply to Don L C, 02-25-2006 18:01:29  
I've seen ads for adapters to use a cordless drill to start small engines. Never tried it myself, but might be worth looking into.

Keith



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Ryan - WI

02-25-2006 18:30:22




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 Re: Compression relief-small engine in reply to Don L C, 02-25-2006 18:01:29  
Not sure if you want to go to the trouble but I rigged up a system on a wooden column for my mom that worked well. I used some pulleys and a couple old window weights. She pulled the weights up as high as they could go then hooked a rope from the weights onto the pull rope and when she let go the weights fell and pulled the engine over for her.



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ldj

02-25-2006 21:03:08




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 Re: Compression relief-small engine in reply to Ryan - WI, 02-25-2006 18:30:22  
Don, Yes you can do that. I have done it and it worked good. I drilled and taped a 1/8" hole for a brass cut off. Don't drill all the way through because that hole will be too big. Drill rest of the way through with small, maybe 1/16", I can't remember for sure. Then drill out larger if needed a little at a time till you can turn it over easy enough and still have enough compression to start.
L.D.

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