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DIY Home Built Motorized Bicycle (non kit) Post all about your home built rides here. Weedwacker motors, lawn mower engines ect. This area is for non kit builds

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  #1  
Old 10-16-2011, 09:31 AM
crowley1027 crowley1027 is offline
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Location: Westerly, RI
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Default Lawn Mower Engine?

I have a 148cc Briggs&Stratton motor on my lawn mower, was wondering if I could use it for my coast to coast trip? Is it the right kind of motor? The gas tank and air cleaner are set so it looks like I would have to mount the engine in the same direction as it sits now on the lawnmower -- Is there any way that you know of that I can remove the gastank/air cleaner, mount the engine sideways, and connect a gas tank and new air cleaner?

I don't know, I'm new to this world. Thanks for all your help.
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  #2  
Old 10-16-2011, 11:34 AM
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SJN SJN is offline
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Default Re: Lawn Mower Engine?

Dont get too attached to that engine. I Think once you look into what it will take to turn it on its side and have it run right you will find it a far better choice to start with a horizontal shaft engine.
Two things you will need is a flywheel from a horizontal shaft eng and mods to the oiling system.
That said, another eng can be found for next to nothing. The 8 hp briggs that I got for my push trailer was free! i know, I lucked out on that one. lol
One more thing to look for is a motor with a charging system to run a battery and lights.
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Old 10-16-2011, 05:14 PM
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NormO NormO is offline
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Default Re: Lawn Mower Engine?

I personally wouldn't use any B&S or Tecumseh engine at all. At least not for that distance. Unless you spend the extra bucks for a commercial engine. Most of these engines only have a rating of 50 hours. That's not much. It's fine on a lawnmower, snowblower or other occasional use equipment. On those they can last 10 years or longer. I would have no trouble myself paying the price for a Honda engine though. That's JMO though and you don't have to listen to anything i've just said at all.
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  #4  
Old 10-16-2011, 06:10 PM
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MotorBicycleRacing MotorBicycleRacing is offline
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Default Re: Lawn Mower Engine?

Quote:
Originally Posted by crowley1027 View Post
I have a 148cc Briggs&Stratton motor on my lawn mower, was wondering if I could use it for my coast to coast trip? Is it the right kind of motor? .
Here are a couple of 5 hp Briggs powered bikes that might be able to make
it coast to coast.

The Briggs pictured are horizontal shaft motors.

The bikes were 1st and 2nd at the Willow Springs race last June and are
going to be at the SoCal race Oct 22nd at Grange in 5 days.

Built by a long time master builder msrfan


Last edited by MotorBicycleRacing; 10-16-2011 at 06:16 PM.
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  #5  
Old 10-16-2011, 06:28 PM
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harry76 harry76 is offline
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Default Re: Lawn Mower Engine?

I love MSRFAN's bikes, didnt realise his bikes placed 1st and 2nd..... nice work!!!!
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Old 10-16-2011, 06:51 PM
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MotorBicycleRacing MotorBicycleRacing is offline
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Default Re: Lawn Mower Engine?

Quote:
Originally Posted by harry76 View Post
I love MSRFAN's bikes, didnt realise his bikes placed 1st and 2nd..... nice work!!!!
Ist and 2nd in the 4 stroke class with msrfan's grandson first.

#8 magrider on a 66 cc 2 stroke China girl beat both msrfan and his
grandson in the Ultimate race so they also got 2nd and 3rd in the big race.

Going to be 5 Briggs bikes racing in just 5 days.
All of them have build threads on this forum.
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  #7  
Old 10-16-2011, 08:12 PM
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professor professor is offline
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Default Re: Lawn Mower Engine?

I totally disagree with the longevity of the mower engines unless you disregard the engine oil and air filter. But DO forget the vertical types.
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Old 10-16-2011, 10:47 PM
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harry76 harry76 is offline
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Default Re: Lawn Mower Engine?

Quote:
Originally Posted by MotorBicycleRacing View Post
Ist and 2nd in the 4 stroke class with msrfan's grandson first.

#8 magrider on a 66 cc 2 stroke China girl beat both msrfan and his
grandson in the Ultimate race so they also got 2nd and 3rd in the big race.

Going to be 5 Briggs bikes racing in just 5 days.
All of them have build threads on this forum.
Very very cool. MSRFAN know his Briggs and very helpful on this forum.

Being Australian i dont know much of the races you have over there (i know im jealous i cant attend LOL), but what is "the ultimate race" and how did a 66cc China girl win? Must be a fast 66cc or just light and nimble, or multiple gears/jackshaft?????

Sorry to hijack the thread..... but then again i guess it is relevant as its showing the reliability in race conditions of different engines and setups
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Old 10-16-2011, 10:50 PM
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Wm Holden Wm Holden is offline
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Default Re: Lawn Mower Engine?

I'm sure a briggs can be made to last countless more hours then the design rating...but...it would take a sensitivity to heat and stress on the aluminum few most likely possess....
a judicious mid throttle breakin period followed by $10 quart synthetic for the life cycle and most likely 3/4 throttle being max output for its life...it may never fail....
but over heat that aluminum once and you are done.
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Old 10-16-2011, 10:52 PM
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harry76 harry76 is offline
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Default Re: Lawn Mower Engine?

Quote:
Originally Posted by professor View Post
I totally disagree with the longevity of the mower engines unless you disregard the engine oil and air filter. But DO forget the vertical types.
Yeah i was thinking the same, how many vintage mowers do you see that are still running? A lot and i think thats proof enough.

Sure we may run the engines for longer periods of time, but we are also travelling at speed thus cooling the engine and also the engine isnt covered in grass and crud, and when used in a bike the engine will most likely be well maintained which wouldnt be true with 99% of mowers that despite this still run just fine.
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