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Hello, I have a XR80r that I have had since it first came out. Now as I am older I am getting into working on bikes and have heard that a cheap way to increase power to a 80 is to replace the carb with a XR100 carb. I took apart the bike and did a complete cleaning of it and it still seems to run a bit rough when I open the throttle all the way, it cuts off when its full open. I hear that its mostly the needle or carb, and since its the original carb I think its probably it as well. So instead of digging in and replacing parts I am just going to throw on a XR100 carb to fix it and give it a upper hand. So my question is what are the steps needed for this. I know I need a xr100 airboot and throttle cable. Ive been all over eBay and have seen xr100 carbs for $20-$80. My stock carb and cylinder head has a 22mm intake opening and the xr100 carbs range from 25-30mm intake openings. So there is a 3-8mm difference. What do I need to do here? can I just install them as is, buy a intake manifold converter or do I need to mod the cylinder head. Also is there a preferred carb? I have seen Mikunis (with a 25 or a 30mm intake opening) which I know are awesome as I have one on my harley, but have also seen aftermarket and OEM carbs (which range from 24-28mm openings). Also do the years of the Carbs play any performance difference, I.E a 1986-2000 XR100 carb to a 2001-2011 XR100 carb. Please advise...also I am curious on a bbr or other rev box as mine is a stock one and really bogs my bike down.
 
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