Sooo. I sucessfully put a honda gx200 carb on my briggs 5 hp flathead that I hopped up. I made a custom intake, welded my own stainless exhaust (about .85"ID 1"OD 2X 45 deg bends in it) It runs like a dream. Direct throttle custom made by myself bolted to a pivot point on the head.
The only problem now is that i cant seem to break some RPM thresholds, and I have been told prior to putting this carb on there that it is going to be pretty restrictive. So here's my setup, and I am looking for advice on a nice carb.
NOS cast sleeve briggs engine with the large dual bearings on crank. broke in with ZDDP break in oil amsoil,
raptor piston with raptor rings
shaved eyebrows
mild port/polish
stock appearing springs
94ss cam
stock length billet rod
flywheel set to cam card, arc billet. (iirc 28-30 btdc)
High flow intake/high flow exhaust with 1"ID RLV muffler.
put on baja heat mini bike with comet 30 series torque converter, 8t jackshaft, and stock rear axle sprocket. Geared correctly. Pops wheelies on start.
Governor gone
stock appearing valves
valve lash set to cam card specs, lapped valves
.029" or .030" copper head gasket
indexed stock plug
gx200 carb with 140 e tube and #36 jet
Seems like the engine just planes out at around 3800 rpms. Makes me kinda sad. So i think ill do a little better port job focusing on upper inside corners, and then shave a little more from eyebrows. I almost want to just take it to my friend with a mill and deck the block while i'm there.
Also, the carb has got to to be too restrictive I think. Im wanting to put a mikuni 22mm in there. Is this the one to fully take advantage of the hop ups?
I am having issues though with breaking any rpm thresholds. It revs up to 4k rpm real fast, then the torque converter takes over and i get to about 38-3900 rpm before it kind of just planes out.
The only problem now is that i cant seem to break some RPM thresholds, and I have been told prior to putting this carb on there that it is going to be pretty restrictive. So here's my setup, and I am looking for advice on a nice carb.
NOS cast sleeve briggs engine with the large dual bearings on crank. broke in with ZDDP break in oil amsoil,
raptor piston with raptor rings
shaved eyebrows
mild port/polish
stock appearing springs
94ss cam
stock length billet rod
flywheel set to cam card, arc billet. (iirc 28-30 btdc)
High flow intake/high flow exhaust with 1"ID RLV muffler.
put on baja heat mini bike with comet 30 series torque converter, 8t jackshaft, and stock rear axle sprocket. Geared correctly. Pops wheelies on start.
Governor gone
stock appearing valves
valve lash set to cam card specs, lapped valves
.029" or .030" copper head gasket
indexed stock plug
gx200 carb with 140 e tube and #36 jet
Seems like the engine just planes out at around 3800 rpms. Makes me kinda sad. So i think ill do a little better port job focusing on upper inside corners, and then shave a little more from eyebrows. I almost want to just take it to my friend with a mill and deck the block while i'm there.
Also, the carb has got to to be too restrictive I think. Im wanting to put a mikuni 22mm in there. Is this the one to fully take advantage of the hop ups?
I am having issues though with breaking any rpm thresholds. It revs up to 4k rpm real fast, then the torque converter takes over and i get to about 38-3900 rpm before it kind of just planes out.
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