You can see how much I hogged out the Pirate Cycle intake in the last photo. Stock the hole is the same size as a Chinese intake. Clamped it onto my drill press and opened it up massivly and radiused the entry and port matched to the block. It has to flow twice a good as stock.
I can't tell you how much power that Puch head adds but it's a bunch. Bike went from about 6:1 compression to around 11.5:1 . Made it harder to get spinning but when it started it wanted to wheelie with my 225 lbs. on it.. mapbike's clutch pads really helped with this build. The stock pads were glazed and just not wanting to spin the motor on startup but the pads solved that problem. One more thing about the head. For some reason carbon was not building up in the combustion chamber at all. I don't know if it's the machineing or silicone in the alloy or what. The combustion chamber was as clean after riding for a month as it was when I bolted it on.
Some have gone on to say that the cooling fins on the side are block from airflow, not true. ANY airflow is good and as long as the bike is moving there is air exchange. Plus I think that having this head even with the compression boost it runs cooler just sitting there.
One last tip: when you go to start back up the bike with the clutch engaged to where you can feel the compression trying to stop the turning. Then ride foreward drop the clutch. That way the motor gets a running start at turning over. If you try to start it up against the compression the back tire just drags but then again I use a fairly slick tire.
Daneil, I think those parts would be best on that motor you rebuild. They would help to unlock all the power your mods made
