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Anybody buy anything from www.motopowersport.com ? I was looking at a CDI there- tried ordering, then calling- then I noticed the http instead of https

Well, not exactly. What he mean't to say was Volumetric Efficiency exceeding 100%. This means drawing in more volume of Air/Fuel than the engine displacement (200cc in this case). When you supercharge an engine by a 2-stroke pipe, turbocharger, or supercharger, you can exceed 100% volumetric...

It's typical for engine builders to raise the piston window ports about 1/8" and not widen it. You want to always limit cutting pistons if it will compromise the integrity (WTF does that mean?) beyond what 1) You know 2) Are willing to spend re-building the engine including...

Wheeler Piston Scallop Mod (WS Mod) Here is a 2-stroke modification to increase the blow-down time and increase the exhaust pulse signal strength to the pipe. This modification is not for beginners and can be done by hand, machine, or CNC. The summary of the mod is to modify your piston dome...

Bigger is Better?

Documents of Wheeler Scallop Modification

I am thinking of making my UCCR more like 12/1 when running on methanol.

I would have to agree with others when they say porting (by someone who knows what they are doing) would be first, then a pipe that MATCHES the increased RPM setting of the porting, and then V-force reeds with a larger carb

Seems the squish angle should be related to the piston dome angle at the outer edge where the squish is- however, as we all know, the piston top is spherical in shape (rounded), so just about any reasonable angle you choose is going to be closer to the piston in the middle of the squish band. I...

PORT TIMING VALUES FOR RPM RANGE. THE FIRST DURATION IN THE XXX-XXX FORMAT IS THE MIN FOR THAT RPM. EXAMPLE: TO GET TO 9000 RPM YOU HAVE TO HAVE AT LEAST 184 EXHAUST AND 125 INTAKE EXHAUST TIMING 7500 RPM 176-178 8000 RPM 180-182 8500 RPM 183-185 9000 RPM 184-186 9500...

Blaster Compression Ratio Calculations Bore = 68mm Stroke = 57mm Displacement = 207cc Formula CR=D+H/H :where D=Displacement, H=Head Volume(total) Formula H=D/(CR-1) Altitude = 4900 ft. Positive Wave Pressure (approx.) = 7 Psi Compression Ratio, Total Head Volume...

I'm going to try about 12/1 for now.

Hmmmm. 15/1 CR seems a bit too high for the pipe I'm running.

Is the gas in the tank old gas? Is the carb gummed up with old gas residue?