foureasy
New Member
appearently i cant post pics yet so you are going to have to use your imagination.
the motor i am building right now is a 66cc or an "80" if you are bad at math, the first thing in order was a pipe. so i built one out of stainless. i was amazed at the difference, i'm mostly a 4 stroke (harley) kinda guy, so i was expecting the first version to barely run. anyways the primary pipe is 1"d and the chamber is 3"d for 3" and the ends of the chamber taper from 3" to 1" in 2".(a picture would be worth at least this many words) now is when i ordered the dellorto 16/16, more on that soon.
next on the agenda was a little more compression and reshaping the combustion chamber. i took 1.5mm (about .060) off the top of the cylinder, and squared it up at the same time (it was almost a half degree off square). now the head needed a nice bevel around the combustion chamber so the piston won't hit. with this done the midrange picked up considerably, it made a bigger difference than the pipe.
last but not least was the carb. it finally came in yesterday, (after more than a week) 73 dollars to your door. anyways, bolted it on to establish a baseline and get a plug reading. total crap! way too rich. pulled the air cleaner off, now it's rich but it runs. took out the main jet (82) and matched it up to some holley air bleeds. everyone on here keeps talking about buying all kinds of jets, well i'll let you in on one of my secrets. SOLDER!! go buy some resin core solder and a lighter, and some super tiny drill bits. anyways, i ended up with a .025" hole in the main and gained about 5 mph. wow what a difference, it just keeps pulling.
keep a look out for my updates, on the menu is a full port job specifically for high rpms and top speed and a new pipe design once the motor is done. clay
the motor i am building right now is a 66cc or an "80" if you are bad at math, the first thing in order was a pipe. so i built one out of stainless. i was amazed at the difference, i'm mostly a 4 stroke (harley) kinda guy, so i was expecting the first version to barely run. anyways the primary pipe is 1"d and the chamber is 3"d for 3" and the ends of the chamber taper from 3" to 1" in 2".(a picture would be worth at least this many words) now is when i ordered the dellorto 16/16, more on that soon.
next on the agenda was a little more compression and reshaping the combustion chamber. i took 1.5mm (about .060) off the top of the cylinder, and squared it up at the same time (it was almost a half degree off square). now the head needed a nice bevel around the combustion chamber so the piston won't hit. with this done the midrange picked up considerably, it made a bigger difference than the pipe.
last but not least was the carb. it finally came in yesterday, (after more than a week) 73 dollars to your door. anyways, bolted it on to establish a baseline and get a plug reading. total crap! way too rich. pulled the air cleaner off, now it's rich but it runs. took out the main jet (82) and matched it up to some holley air bleeds. everyone on here keeps talking about buying all kinds of jets, well i'll let you in on one of my secrets. SOLDER!! go buy some resin core solder and a lighter, and some super tiny drill bits. anyways, i ended up with a .025" hole in the main and gained about 5 mph. wow what a difference, it just keeps pulling.
keep a look out for my updates, on the menu is a full port job specifically for high rpms and top speed and a new pipe design once the motor is done. clay
but I do need help with nt carb jets, what size is the origional? .I had an expansion chamber but it was one of those with the rubber joints and copper pipe fittings for connectors what a pos that was for $75.00
