I had a GP40 last Year, Sachs 504/2A(Manual 2 Speed, Short Block, 44mm instead of 42mm Stroke crank, 3 plate cluch) swap, got it up to 93kmh(58mph) with the stock cylinder, crashed it into a tree at about 20-25 in the woods last autumn…
Now i want to do it again!
Well, not the crashing part, but the going over 90(55mph) with a modified stock cylinder, sadly back then i didn't get it over 100(62mph) but now i would like to do it, this time with more compression, and pre-compression and better everything.
I would like to chop the head of a Sachs 535 cylinder, put a puch head on top of it, and use a puch piston, why a puch piston? well, its about 4 or 5mm shorter on the piston crown, wich i am hoping will get me more pre Compression, of course i will probably need to remove a couple of milimeters from the cylinder base, and sealing surface for the head. Mabe make a ZME(Zylindermembraneinlass, or in english cylinderreedvalve) and some Boostports.
What would you Guys(and girls) think about doing something like that?
Friends told me to get a 70ccm or 80ccm kit, but i dont want that, i think there is not much fun in putting on a Cylinder, Exhaust, gearing and carb, tuning the carb and Ignition and going 90(55mph) with that, there is more fun in testing, trial and error ang etting power out of a stock cylinder. Also, my gp40 could Blow the (non existing)
doors of Puchs with e50 engines and 70ccm Athena and airsal kits with a Little shorter gearing.