Pocket Bike Engines Tutorial

sprocket

The one I'm about to make is almost to simple, kinda like the guy building it!!?!!FPRIVATE "TYPE=PICT;ALT="



k pic 1
is a jackaxle! well its gonna be. what it was was a pocket bike rim until i cut the hub out of the middle . I'm using it because I had it . It has races, bearings, an axle. and even has threaded holes for our drive sprocket which incidently, came off same pb.
You can use rear of front wheel , backs wider but fits and has holes on both ends ,one for sprocket , the other side for disk brake which can be used as an engine brake now that your wheel. has migrated into a jackaxle. The one I'm using is the narrower front axle and the disk brake and rear sprocket have icendtical bolt pattern so bolts right up

pic 2
is a stock 68t pocketbike sprocket


pic 3 is a sprocket that a garnered from a cluster off a mountain bike. Itsa little light duty but will work if you havent anything better


pic 4

shows the drive sprocket bolted onto jackaxle and the secondary drive sprocket sitting inside. this sprocket will be substituted for a pully in a vbelt build. You have to cut the centre out of pulley to slide over jack axle and once we get the engine and rear final drive sprocket attached, we'll know how much of a spacer we'll need between the sprockets on the jack axle.
We'll get back to that later.


pic 5

is a front sprocket of a mountain bike woth a rock ring


pic 6

same sprocket attached to flatstock i cut out of some stuff i got laying around . the inner holes will be used to attach assemble to spokes in same manner as happy time sprokets. I should mention I bolted the rock ring to the steel ring, not the sprocket itself!!??!!
belt drives wil use a 10 or an 11'' pulley instead. I have a couple happy time rear sprockets that I'll be using but if you havent one , this will get you rolling.


Remember everything I show you here is not an idea but a tryed and proven system however they are all my own designs and by no means are they state of the art or are they the best way of doing it. If you think you have a better way of doing something , youre probably right and thats the way you should do it.


You'll be needing some materials to build the motor mounting plate , the rack etc.
Apiece of fairly heavy plate that wont bend from torque to bolt the engine down. try find something that has a second side you can use just to make it more sturdy. will post a pic inna bit. also some angle iron. I use 1 1/2'' angle iron .I get it free from old steel bedframes that are everywheres. the metal folding ones . They work exc. use what you got or what you can get. And unless you're a welder, a bunch of nuts and bolts. I dont weld. I bolt everything. I use 3/4' and 1'' long 1/4'' bolts. for virtually the whole build. don't forgot lock washers.
__________________
~There's nothing left on the right side of my brain~
~And nothing right on the left~

OK my question is the pocket bike engine I have has a 6 tooth sprocket. Now can I replace it or get a new engine or weld a bigger one on it?
 
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