Author Topic: Everything you ever wanted to know about modifying a 3 hp Briggs..here..  (Read 14889 times)

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Offline offroadwhatever8

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Are 3 and 5 hp carbs the same? from what i know they are, but i want to make sure before i buy a 5 hp carb kit off ebay and when it gets here its the wrong one. Thanks John

Offline offroadwhatever8

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Everything you ever wanted to know about modifying a 3 hp Briggs..here..
« Reply #1 on: February 02, 2007, 06:06:13 pm »
I would like to port my 3 hp briggs, i do not have a die grinder, but i do have a dremel 400 xpr. I just need to know which is the best grinding wheel for when i do it  :confused: Thanks, John

Offline offroadwhatever8

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Re: Best Dremel Grinding Wheel for Porting
« Reply #2 on: February 02, 2007, 07:11:21 pm »
Randy, Rocky, George Any one  :confused:

Offline sr71mopar

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Re: Best Dremel Grinding Wheel for Porting
« Reply #3 on: February 02, 2007, 07:26:38 pm »
For mild blending on aluminum, I like to use cartridge rolls like these:

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Offline mightymowe

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Re: Best Dremel Grinding Wheel for Porting
« Reply #4 on: February 02, 2007, 07:52:38 pm »
The sandpaper is probably the best unless you can find burr's that are for nonferrous metals the burr's that are for ferrous metals like to plug up in aluminum unless you use some lubricant
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Offline offroadwhatever8

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Re: Best Dremel Grinding Wheel for Porting
« Reply #5 on: February 03, 2007, 11:07:18 am »
Thanks  :)

Offline offroadwhatever8

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more questions
« Reply #6 on: February 04, 2007, 09:27:58 pm »
If i shave the head, and port my 3 hp, how much of a power gain would that be? I just dont really wont to spend a hole lot of money on billet fly wheels and such becuase i could just get a 5 hp with that amount of money, so im limited down to just shaving the head and porting.

Offline offroadwhatever8

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Tecumseh carb on 3 hp briggs
« Reply #7 on: February 04, 2007, 09:46:52 pm »
I dunno if this would work and if it did i don't know if it would increase power. If i made a special adapter to fit a 6 or a 8 Tecumseh carb to my 3 hp Briggs, would this work? I came up with this idea literally 2 seconds ago, so tell me if i just made a complete idiot out of my self

I also found this, just look at the adapter and carb, thats kinda what I'm thinking about... Thanks John



NOTE: THIS IS BASED ON THE MOTOR NOT THE MINI BIKE


Offline money89tractors

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Re: Tecumseh carb on 3 hp briggs
« Reply #8 on: February 04, 2007, 10:14:47 pm »
ive seen many adaptors to put briggs carbs on tecumseh engines, and vise versa. but the big question to me is why would you want to? tecumseh engines (stock) seem to have many problems with their carbs. if you are wishing to put a bigger carb in  your little 3 hp engine, why go to a different manufacturer?

if the 6 or 7 hp carb will work on t he 3 hp, without flooding it like i would think it would, you could just as easily to adapt a 5, 6, or 7 hp briggs carb onto it.

if you build up the 3hp with a good cam, lighter flywheel, stiffer valve springs, lighter piston, billet rod, offset flywheel key and possibly a bore over then i could see a reason to use something like a 8hp carb, maybe, due to the extremely high rpm's you could/would turn.

if you really just want to but a slightly larger carb on the 3 hp, to see if it helps with power any, get a 5hp carb, and make an adapter.

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Offline allen minaker

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Re: Tecumseh carb on 3 hp briggs
« Reply #9 on: February 05, 2007, 11:33:29 am »
 .

Offroad - I would think with some mods and a custom intake you should be able to run any type of carb . just make sure it's not overkill .
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Offline crocco58

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Re: Tecumseh carb on 3 hp briggs
« Reply #10 on: February 05, 2007, 11:39:56 am »
Have you ever checked out this place: http://4cycle.com/ ?
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Offline allen minaker

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Re: Tecumseh carb on 3 hp briggs
« Reply #11 on: February 05, 2007, 11:52:08 am »
Cool site !!!!!!!! THANKS
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Offline TheMowinCuban

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Re: Best Dremel Grinding Wheel for Porting
« Reply #12 on: February 05, 2007, 12:32:22 pm »
i didnt even use a dremel on my carb, i just put sand paper on the end of my finger and worked away at it!
Gotta love a good 'ol Briggs Flathead! :thumbsup:

Offline TheMowinCuban

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Re: more questions
« Reply #13 on: February 05, 2007, 12:35:05 pm »
after porting your carb, you should notice A LOT more power on top end, but to get low end power, you'll have to supercharge it kind of like i did, also grind up 1 moth ball and add it to your gas, it increases your octane in your gas, and you will get even more power, and you'll start to notice some pretty big flames comin from your exhaust!!
Gotta love a good 'ol Briggs Flathead! :thumbsup:

Offline offroadwhatever8

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Re: more questions
« Reply #14 on: February 05, 2007, 12:38:23 pm »
cool, thanks dude

Isnt adding moth balls bad for the engine? I herd they can give you more power but they can harm the motor. But ill have to give it a try  :)