Take a Stock Honda GX-200...
Take off the gas tank.
Remove the flywheel and fan
Remove all tins.
Remove sidecover
Remove head, valvetrain.
Push out rod and piston
Remove crankshaft.
okay, you got a bare block...nice.
Now, pull the governor gear out, and get the little washer behind the gear. Next pull the governor rod, and cut it off at the bend, and put it back in.
Put the crank back in.
Take some 400 grit sandpaper and carefully polish the stock con rod, making sure to smooth all rough edges..finish it off with some 800 grit. Clean the rod in solvent to remove grit.
Next order these parts..
OEM flat top piston
18lb G200 springs
Billet spring keepers.
1.3:1 rockers
Find a 14cc old style GX-160 cylinder head..Clean up the transition between the port and the bowl, massage the shortside radius and smooth it all out, maintain the D shape. Send it off to a shop and have it milled flat, have Stainless vlaves installed, undercut and swirl Polished, 3 angle valvejob.
Put the rod and piston back in...
Put the head on.
Order a Tillotson HL-314G carb, and an EC honda billet intake with pulse fitting. K&N air filter with Velocity stack.
Put the carb/intake on, and use an EC up-pull throttle kit.
Put the head together, valves, rockers, etc..and put it on the block.
Assemble using Studs, or Grade 10.9 bolts. Set valve lash to 0.002" on both valves.
now put the sidecover on.
Find a GX-160 flywheel, itis set for 4* timing advance. Take the plastic fan, and cut off every other fin.
Put the flywheel and fan on.
Cut the wires off the oil alert.
Set coil gap to 0.015".
Install recoil.
Order a Mikuni Round body pulse fuel pump..
Install it, using 2 bolts to the bottom of the lower cylinder shield, with the pulse side to the fin, and the outlets to the carb side. Inlet to the PTO side.
Now run some thick walled fuel line (transparent) to the pulse fitting, fuel inlet, and run the last one to your remote tank.
install a chainguard/clutch guard.
Lastly, install an RLV 12" Open header.
Run 93 octane fuel...
There you have it...I just built this monster...Hope to run it this weekend on my old Emmick Flat Kart. Ill grab some pics of the engine and Kart when it's all together.
Oh, and run a race oil...Im using Briggs/Valvoline Kart Racing oil.