hey guys, I have a question for our forum journeymen I'm struggling to figure out the best head and carburetor to use. I'll post the specific class rules, pretty much stock clone leaving a lot of stuff optional.
Stock carburetor only:
Choke must be installed and working.
Choke bore .810" no-go.
Venture .615" no-go.
Rear carburetor bore .751" no-go.
No Fuel Injection.
No pressurized systems.
No fuel pumps.
Jetting is allowed, including adjustable jets.
No aftermarket carburetor or intake may be used.
Aftermarket air filter is allowed.
I was wondering if this carburetor would fit this bill:
https://www.OldMiniBikes.com/Pro-_615-Blueprinted-Carburetor.html?category_id=1623
and for the head I was here's the rules on the engine:
All engines shall remain stock with the following exceptions:
Piston must be dished.
Advancement of timing is allowed.
Camshaft CL-1 by DynoCam (Keep Spec card for Tech).
Intake duration at .050 lift 218.4 degrees and at .200 lift 85.6 degrees. Peak lift .223".
Exhaust duration at .050 lift 221.4 degrees and at .200 lift 96.9 degrees. Peak lift .230".
Flywheel:
Should be SFI certified fixed timing steel or aluminum flywheel. SFI certified flywheel will be mandatory for 2016.
Stock rockers with maximum lift measured at valve of .245".
Valve spring maximum wire diameter .698"
Valve spring pressure of 10.8 lbs maximum at .850".
does a gx 140 or 160 head suit these rules? Or basically my question is, which clone head has the most compression and the biggest valves/intake/exhaust ports?
Stock carburetor only:
Choke must be installed and working.
Choke bore .810" no-go.
Venture .615" no-go.
Rear carburetor bore .751" no-go.
No Fuel Injection.
No pressurized systems.
No fuel pumps.
Jetting is allowed, including adjustable jets.
No aftermarket carburetor or intake may be used.
Aftermarket air filter is allowed.
I was wondering if this carburetor would fit this bill:
https://www.OldMiniBikes.com/Pro-_615-Blueprinted-Carburetor.html?category_id=1623
and for the head I was here's the rules on the engine:
All engines shall remain stock with the following exceptions:
Piston must be dished.
Advancement of timing is allowed.
Camshaft CL-1 by DynoCam (Keep Spec card for Tech).
Intake duration at .050 lift 218.4 degrees and at .200 lift 85.6 degrees. Peak lift .223".
Exhaust duration at .050 lift 221.4 degrees and at .200 lift 96.9 degrees. Peak lift .230".
Flywheel:
Should be SFI certified fixed timing steel or aluminum flywheel. SFI certified flywheel will be mandatory for 2016.
Stock rockers with maximum lift measured at valve of .245".
Valve spring maximum wire diameter .698"
Valve spring pressure of 10.8 lbs maximum at .850".
does a gx 140 or 160 head suit these rules? Or basically my question is, which clone head has the most compression and the biggest valves/intake/exhaust ports?