Topic: 19.5 single ohv briggs - simple motor upgrades

[Hoonigan]

So.... I have a 19.5 single ohv briggs, and looking for some info as to what I can do to the motor to increase hp with out buing parts! Thanks!

[cycloneracer]

If you don't want to spend any money leave it stock. 

Building more power will require purchasing parts.  The first thing you need is a billet flywheel.

[Hoonigan]

The class i race in is stock internals but looking for little tricks to turn out a few more hp from the motor

[Kokamo]

A free flowing air filter (but cost $$$), a small timing advancement with a timing advance keyway (but cost $$$), custom built exhaust, but to do it right, you must research how to do it to make power (but yet again, cost $$$)....use a thinner oil perhaps? Use 100 octane race fuel ($$$)....use a thinner head gasket to bump up compression a bit ($$$)....

Not really much can be done to make more power without spending any sort of money. Leave it stock and work on getting the chassis right.

~Joe

[cycloneracer]

The class i race in is stock internals but looking for little tricks to turn out a few more hp from the motor

Soooo. Your looking to cheat. 


Seat time will win more races.   

[Hoonigan]

Thanks for the input! Those are the kinda things i was looking for! I should have worded my first post better, when i said with out spending money i was refuring to not buying any internal up grades like crank pistons flywhell etc...! And no i wouldnt call it cheating lol just increasing the hp with out having to get a bigger motor,

[Hoonigan]

Also what oil should i be using? Im using castrol SA30 right now

[Kokamo]

Also what oil should i be using? Im using castrol SA30 right now

Correct. I use 10-30 full synthetic in my race motors.

~Joe

[Michaelgc7]

Mill the head, disconnect governor (aluminum flywheel needed), advance timing, gas port the piston, polish the crank to remove windage, olish the rod, stiffen valve springs, ......... there are a few shade tree tricks