B&S 5hp Engine

[Snype2live]

I have a B&S 5hp, I have removed the govenor and put a three horsepower flywheel on it and a custom exhaust of of a mini crotch rocket and Im just looking for some suggestions on building this and making it faster.

 

[solomon]

swap your 5hp flywheel back on it for torque. You will need a custom bracket for the coil to work with that flywheel. Remove that exhaust a 3/4" straight pipe about 14" should be good. Did you pull the internal governor and washer?

 

[Kaptain Krunch]

Doubt a mini crotch rocket would need the extra torque, i would just use the 3hp one.

 

[solomon]

Doubt a mini crotch rocket would need the extra torque, i would just use the 3hp one.

He said he used the exhaust off a mini bike, probably a 47cc and thats a 2 stroke pipe, it will make the motor lose power, by reducing flow.

 

[Snype2live]

yea it is a much smaller pipe and i didnt get a custom bracket for the coil i just customized the coil and how much would the 3/4" 14" pipe affect the engine

 

[Snype2live]

Oh yea, i removed internal gov and washer

 

[solomon]

you can gain somewhere around .75 HP from a straight pipe, you can get that at the hardware store for like $7

 

[Snype2live]

awesome...anymore suggestions ...they are greatly apprciated..i think im going to get some pics and post them on this thread so you all can actually see to judge and make suggestions

 

[solomon]

you should really use the 5hp flywheel for the extra torque. Port the intake valve slightly, shave the eyebrows, eliminate the head gasket.

 

[Snype2live]

explain the shaving the eyebrows, i just got into this not really sure what that means sorry.. but i been in mechanics for two years so im great with tools and engines just not the lingo yet ...and i heard that the 3hp fly wheel will advance the timing 6+degrees and will increase the torque?

 

[solomon]

the 5hp flywheel will produce better torque, if you want to advance the timing just shave the flywheel key a bit. The eyebrows refers to the metal between the valves and the piston.
http://www.diygokarts.com/vb/showthread.php?t=1583
http://www.diygokarts.com/vb/showthread.php?t=7358

Those are the 2 BEST guides around for the engines. I would recommend you get a ARC billet connecting rod ($60) as well

 

[Snype2live]

alright thank you ill get some pics of the frame so i can get some suggestions on that

 

[solomon]

yea no problem. And pics would be great!

 

[Snype2live]

ok will get u some ...ugghhhhhh!!!!!!!!!! i broke a bolt of in the pto side of the crank shaft

 

[solomon]

Bummer, use a drill bit and tap it to the next size, or leave it, and use set screws on a clutch

 

[Snype2live]

could i just use a clutch with set screws? and where would i get one cause all i had was a torque converter and its belt driven

 

[Snype2live]

or i could could just get a new crankshaft

 

[solomon]

Drilling and re tapping isn't that hard. Does your motor use the starter cup or starter clutch? If its the cup style starter, I have a crank i would let go of for cheap.

 

[Snype2live]

it is a cup style and yea i know it isnt that hard but i dunno if i have a drill bit hard enough to cut it

 

[Snype2live]

OK so besides the cheap project im doing im actually thinking about investing the money and buying a good block and building an actual racing engine so where and what would u recomend starting