Briggs and Stratton 5hp mods

[kawicat]

what are popular mods for a Briggs and Stratton 5hp Flathead?

any help/suggestions are appreciated thanks.

P.S. no i do not want to put a bigger motor in the kart.

 

[Zombient]

Bored out cylinder, cam, rod, shaved head, shaved eyebrows, port/polish intake/exhaust, jet carb, whole new carb, muffler.

 

[kawicat]

how much power could i make with that setup? what about supercharging it? is that an option?

 

[Poboy kartman]

Bored shaved head, shaved eyebrows,

Those are the only mods I can afford!

 

[Denny]

The cheapest mod would be to bolt on a Predator.


Denny

 

[kawicat]

I know a predator would be a quick solution. I dont mind doing some work to the motor i already have. What carb should i put on? Should i leave the governer how it is? Or should i remove it? What needs to be removed for the motor to function properly?

thanks again.

 

[Zombient]

I know a predator would be a quick solution. I dont mind doing some work to the motor i already have. What carb should i put on? Should i leave the governer how it is? Or should i remove it? What needs to be removed for the motor to function properly?

thanks again.

That's going to take a little bit of info. What model is the Briggs? Is it a flathead or OHV?

Carb? Well, you can be creative with that. I've seen Honda carbs on flathead Briggs engines. Removing the governor will help with the RPM, but that also brings a few risks, like throwing a rod. I doubt you'll shatter the Briggs cast flywheel, but you can easily throw a rod. Removing the gov means fully removing it. Not just disconnecting it. There's hundreds of videos on YT for that.

Which I forgot to add that too. You can get a lighter flywheel too.

 

[landuse]

Briggs modifications
http://www.diygokarts.com/vb/showthread.php?t=2776
http://www.diygokarts.com/vb/showthread.php?t=1450
http://www.diygokarts.com/vb/showthread.php?t=1454
http://www.diygokarts.com/vb/showthread.php?t=1583

 

[OzFab]

How much power do you want = how deep are your pockets...

Jr dragsters manage to drag 50hp (no, that's not a typo) from a 5hp B&S engine, it all depends on what you want it to do & how much you're willing to spend...

 

[kawicat]

Id like to have 8-12 hp. I milled the head flat today and installed a thinner gasket. Tomorrow i will shave the eyebrows and maybe remove the governer

---------- Post added at 10:42 PM ---------- Previous post was at 10:40 PM ----------

Would a mikuni 30mm slide carb work or would that be too big?

 

[kawicat]

So i pulled the governer but i havent done the eyebrows. Do i need to pull everything from the block to do so? also i have a 30m mikuni from a snowmobile that i was wondering if i could use

 

[OzFab]

IMO, a 30mm carb may be a bit much...

 

[kawicat]

Do i need to strip everything down to do the eyebrows or can i just put a rag down the bore?

 

[landuse]

Do i need to strip everything down to do the eyebrows or can i just put a rag down the bore?

You would probably want to strip it down. The chance of getting metal into the engine is too great to take the chance

 

[KartFab]

Do i need to strip everything down to do the eyebrows or can i just put a rag down the bore?

I would use a rag dipped in some solvent, clean the head off, then put painters tape over the piston to seal the bore.

 

[kawicat]

Picked up a sled motor to put in my kart so wont be doing anything more with the flathead. Thanks to those who helped. Mods can close thread now. Thanks again.

 

[rocketkart]

well ok than !!!