The 2 86' LT230E's I bought are still on stock bore and they smoked last time the previous owner had em' running.  So I was wondering if I could bore it out to make it a 250cc.  Is it possible to bore it that much?  Also my "MECHANIC" took the carb off it tonight to clean it and ended up breaking the choke part or parts in the carburetor.  So I took off the other carb from the donor quad... he tried to get its choke out in order to fix the other carb...guess what? He effing broke the choke in both carbs.   Now I'm wondering if I should buy a bigger carb since I want to bore it.  I'm a collector by nature and I usually try to keep things as original as possible, but I'm 230lb's.  I don't think a 230 has enough power to make it up these steep hills in the Ozarks, MO.  Which is why I want to bore it out.  I have been very busy swapping all the good parts off of the donor and using them parts on the other one.  Is there an aftermarket exhaust for an 86'?  The stock one will do for now but I want more power so the stock one will eventually need replaced.  Also, there is a bolted on plate behind the front sprocket.  Can I take that plate off and be good to go or will transmission parts come out when I remove the plate?  It's held on by 4 bolts.  The plate is broken and needs replaced with the one off my donor 230.  Thing is, I'm having trouble getting the front sprocket retaining nut off so I can remove the plate behind it.  I put the bike in gear held the back brake lever down while I tried turning the sprocket nut, but it just turned the motor over. Do I need to break out my torch and heat that nut up to get it off?  Do I turn the front sprocket nut clockwise or counter clockwise to get it off?  The donor quad has a different spark plug than the other 230.  The donor has a D8EA spark plug and the good 230 has a D7EA.  What spark plug do I need?  I changed the oil and boy was it thick and black as hell.  Once I get the carb installed, I plan on pull starting it to fire up the engine for the first time in a long time.   The question I have is... do I need a battery installed to pull start it?