its a piston ported engine, looks the same as the one on my cateye, except just a bit different at the exhaust side of the motor. Ill go out and get some pics of the motor now.
i havnt decided what to do with the motor yet. i bought the 4wheeler mainly to get the motor and parts. When santa brings me a mig welder for xmas then i can start thinking about custom toys. i wanna make something fancy. got any ideas?
the motors piston has a dome shaped top, does anybody do anything to the pistons to mod the motor? anybody got a pic of a scalloped piston, someone mentioned they used to do it to old macs but i couldnt quite understand what the process to doing it was. lets just say the guy was no Cam2, when it comes to explaining motors to dummy's
LOL.....Thanks............As far as a fancy project.....Id take that mini quad add a lil stretch to the rear and refine the seat height/riding position......add kart wheels all the way around,,horstman axle clutch and slap a 80cc twin carbbed methanol huffer in it.........
One of my ideas one time was to take an old tube gokart frame and weld a pocketbike frame onto it together to change the riding position
The engine is the same as the one on my stand-up scooter in the pic...I ported the snot put of it and chopped the top to get the squish extremely tight to where I gotta run 112 VP racegas
As for the piston the scallopping he does is to a flattop piston to keep the flame kernel centerized to the piston to keep as much heat deflected away from the rings...
You want to index the pocketquad engine piston...Heres what I do to my pistons.....I start with a stock head where the exhaust port and intake ports have been widened 1/8" on each side with the exhaust raised 1/8".
I remove the rings from the piston....
I clean the pistontop......
I place the piston back onto the rod,,reinstall the head without a basegasket and roll piston to bottom dead center....youll notice the piston is like a speedbump....
Put thepiston to TDC and make sure that theres no piston skirt impinging on the intake port...if so mark that with a sharpie or scribe the port top shape
Also get a theoretical baseline squish calculation by adding two base screws and using 3/32" diameter soft solder...some heads are within .028"-.033" when the basegasket is removed..If so then indexing the piston wont matter too much......
Take a sharpie or sharp scribe and mark the piston side where it sticks up from port side width above the top ring groove...This material must be removed and reshaped to ease the speedbump
I take a dime and balance it on the dome and take notice how high the dime sits above the crown..Thats about how much gets grinded down.When done the piston is almost flattopped.........
I draw a round circle,,When connected to the scribe lines forms a keyhole shape
Beltsand the center flat and dremel in the channel.......sand the top kind of flat with 150 grit aluminum oxide emery paper,,polish the top.......
stick the piston back in the cylinder and recheck pistontop at BDC....It should impinge less......If so recalculate actual squish
After all checks out I widen the ring grooves 1/64" and deepen them 1/64" too
I bevel the piston skirt edges 45 degrees,,add 4 purge windows in the piston sides facing the fuel transfer ports,,chamfer the holes and reshaped the sideskirts
Then youll want to blueprint the rest of the assembly..........
