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lawn boy tecumseh to briggs swap? #4679150
02/26/18 09:04 PM
02/26/18 09:04 PM
Joined: Dec 2012
Posts: 605
Washington for now
WhyMe Offline OP
WhyMe  Offline OP
Joined: Dec 2012
Posts: 605
Washington for now
i have a 1994 silver series lawn boy . it has a 4 cycle 5.5 hp tecumseh engine in it. after all these years the engine died. the body and drive is still in good shape.

my neighbor has a mower with a briggs 6 hp engine on it. the drive is shot, but the engine runs.

so i am wondering if i can swap that engine into the lawn boy. anyone do a tecumseh to briggs swap? do they use the same bolt pattern?

Re: lawn boy tecumseh to briggs swap? [Re: WhyMe] #4679170
02/26/18 09:20 PM
02/26/18 09:20 PM
Joined: Sep 2004
Posts: 7,518
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,518
Marshfield , MA
That's why God invented the 3/8 drill grin2


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: lawn boy tecumseh to briggs swap? [Re: WhyMe] #4679220
02/26/18 09:58 PM
02/26/18 09:58 PM
Joined: Dec 2016
Posts: 6,226
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,226
Waco, TX
Get a Harbor freight vertical shaft engine instead.

Only: $119.99 (Compared to $369.99, Honda GXV160)

https://www.harborfreight.com/55-hp-173cc-ohv-vertical-shaft-gas-engine-carb-69731.html


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: lawn boy tecumseh to briggs swap? [Re: WhyMe] #4679227
02/26/18 10:01 PM
02/26/18 10:01 PM
Joined: Dec 2016
Posts: 6,226
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,226
Waco, TX


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: lawn boy tecumseh to briggs swap? [Re: WhyMe] #4679231
02/26/18 10:07 PM
02/26/18 10:07 PM
Joined: Dec 2016
Posts: 6,226
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,226
Waco, TX
Hmmmmm......

.

https://www.ebay.com/itm/271932531668

NEW 140cc OVERHEAD VALVE VERTICAL SHAFT GAS ENGINE MOTOR 7/8"



"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: lawn boy tecumseh to briggs swap? [Re: WhyMe] #4679235
02/26/18 10:09 PM
02/26/18 10:09 PM
Joined: Dec 2016
Posts: 6,226
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,226
Waco, TX
Even cheaper!

https://www.ebay.com/itm/5HP-140cc-Press...ft/282632524952

5HP 140cc Pressure Washer Tiller Log Splitter Engine DJ1P65F 7/8" Shaft



"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: lawn boy tecumseh to briggs swap? [Re: WhyMe] #4679239
02/26/18 10:11 PM
02/26/18 10:11 PM
Joined: Dec 2016
Posts: 6,226
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,226
Waco, TX
HEY!!
Here's a Honda!!

The price is RIGHT!!!
.

https://www.ebay.com/itm/GCV-190-Honda-6...e-/281880370047

GCV 190 Honda 6hp Over Head Cam Motor 7/8" x 1-7/8" Vertical Shaft Engine



"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: lawn boy tecumseh to briggs swap? [Re: WhyMe] #4679241
02/26/18 10:12 PM
02/26/18 10:12 PM
Joined: Dec 2016
Posts: 6,226
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,226
Waco, TX
This Honda is cheaper yet!

GCV 190 Honda 6hp Over Head Cam Motor 7/8" x 1-7/8" Vertical Shaft Engine

https://www.ebay.com/itm/GCV-190-Honda-6...e-/282316203043


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: lawn boy tecumseh to briggs swap? [Re: WhyMe] #4679242
02/26/18 10:14 PM
02/26/18 10:14 PM
Joined: Aug 2008
Posts: 3,155
USA
Reddy45 Offline
Reddy45  Offline
Joined: Aug 2008
Posts: 3,155
USA
The HF Predator engine can be bought for even cheaper if you use a 20% off coupon.

I installed one on an old Craftsman 22" push mower and it fit right on. Started on the 1st pull too, every time.

Re: lawn boy tecumseh to briggs swap? [Re: WhyMe] #4679249
02/26/18 10:21 PM
02/26/18 10:21 PM
Joined: Jul 2013
Posts: 1,668
Ottumwa, Iowa
jhellwig Offline
jhellwig  Offline
Joined: Jul 2013
Posts: 1,668
Ottumwa, Iowa
They guy asked if he could swap the engines not where to get a new one.


If the holes aren't there drill them. It will work with a little work.


Sparks fly from my fingers.

1995 Chevy K2500 Suburban lt 5.7
2014 Toyota Sienna
1983 Chevy K5 350
Re: lawn boy tecumseh to briggs swap? [Re: WhyMe] #4679256
02/26/18 10:30 PM
02/26/18 10:30 PM
Joined: Sep 2015
Posts: 1,523
USA
mk378 Online content
mk378  Online Content
Joined: Sep 2015
Posts: 1,523
USA
It's probably the same mounting bolt pattern. The bigger question is the shaft size.

I have had a lot of trouble with the mounting bolts being stuck in the engine and breaking off trying to remove old Briggs engines. Also blade adapters rusted onto the shaft.

Re: lawn boy tecumseh to briggs swap? [Re: WhyMe] #4679293
02/26/18 11:16 PM
02/26/18 11:16 PM
Joined: Mar 2008
Posts: 5,840
South Florida
bubbatime Offline
bubbatime  Offline
Joined: Mar 2008
Posts: 5,840
South Florida
It will bolt right on. The shafts have to be the same length, otherwise you will never find the proper adapter to get the blade in the right spot. If the shafts are not the same size, forget it.

Shaft diameter is either 7/8 or 25mm. Length of shaft is usually 3 5/8, but not always.

Getting the rusted blade adapter off can be impossible.

It might be easier/cheaper to rebuild the drive components on your neighbors mower. Or buy a used mower off Craigslist.

And almost every one of those engines posted above by a well intentioned poster would not even come close to working.


17 Chrysler Pacifica Mobil 1 5W30
13 Yamaha XT250 Valv MC 10W40
12 Suzuki S40 Rotella 15W40
10 Acura TSX 2.4 PZL Plat 5W30
06 GMC Sierra Nextgen 10W30


Re: lawn boy tecumseh to briggs swap? [Re: bubbatime] #4679305
02/26/18 11:51 PM
02/26/18 11:51 PM
Joined: Dec 2012
Posts: 605
Washington for now
WhyMe Offline OP
WhyMe  Offline OP
Joined: Dec 2012
Posts: 605
Washington for now
Originally Posted By: bubbatime
It will bolt right on. The shafts have to be the same length, otherwise you will never find the proper adapter to get the blade in the right spot. If the shafts are not the same size, forget it.

Shaft diameter is either 7/8 or 25mm. Length of shaft is usually 3 5/8, but not always.

Getting the rusted blade adapter off can be impossible.

It might be easier/cheaper to rebuild the drive components on your neighbors mower. Or buy a used mower off Craigslist.

And almost every one of those engines posted above by a well intentioned poster would not even come close to working.


it actually died at the end of the summer last year. i was able to to find a 2000 toro super recycler for $60 that i will use this year. i really just want to do this as a fun project. i am hoping that i can use the engine and if possible the pulleys from the other mower to work the drive on the LB. i don't plan to throw too much money at it . if it does work i might give to someone in need .

these offset wheel Lawn boys seem to have a collector following .

Last edited by WhyMe; 02/26/18 11:52 PM.
Re: lawn boy tecumseh to briggs swap? [Re: WhyMe] #4679310
02/27/18 12:03 AM
02/27/18 12:03 AM
Joined: Jan 2018
Posts: 534
San Antonio, TX
das_peikko Offline
das_peikko  Offline
Joined: Jan 2018
Posts: 534
San Antonio, TX
To answer the original question: As long as the bolt pattern and crankshaft length are the same, it'll work.

Re: lawn boy tecumseh to briggs swap? [Re: WhyMe] #4679331
02/27/18 12:36 AM
02/27/18 12:36 AM
Joined: Dec 2012
Posts: 556
Cave City KY
jakewells Offline
jakewells  Offline
Joined: Dec 2012
Posts: 556
Cave City KY
Briggs engine will fit the deck just make sure that shaft isn't to long or you got to shim the engine with round washers. You will also have to use a universal 21'' blade.


1994 Ford F150 302 4R70
Chevron Delo SAE 30 CF/SL Fram XG8A

1978 Chevy Nova 250 I6 Borg Warner T5
Rotella 10W40 Fram XG5

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