kjh Posted March 12, 2011 Report Share Posted March 12, 2011 I am considering upgrading my banshee by buying a trimmed out 7 mill 420 stroker and exchanging motors and other parts. I have two concerns, one is I am not familiar with the 7 mill. Mostly hear of 4 mills, pros and cons? Second, I will be exchanging motors from a J arm frame to an A frame any hang ups here? Very familiar with the basics of whats needed to upgrade to a 7 mill. carbs swing arm etc. What I want to know is what are the characteristics of a 7 mill and why do most seem to do 4mill? Currently I run a stock motor with porting, cool head and all the bolt ons. +4 swing arm(moving to 6), T5 pipes(moving to in frame CPI's) Thanks for reading. Quote Link to comment Share on other sites More sharing options...
STINKYDELUXE Posted March 12, 2011 Report Share Posted March 12, 2011 Unless you are getting a really good deal on a 7mil i would just go with a 10 mil. Quote Link to comment Share on other sites More sharing options...
kodie Posted March 12, 2011 Report Share Posted March 12, 2011 I am considering upgrading my banshee by buying a trimmed out 7 mill 420 stroker and exchanging motors and other parts. I have two concerns, one is I am not familiar with the 7 mill. Mostly hear of 4 mills, pros and cons? Second, I will be exchanging motors from a J arm frame to an A frame any hang ups here? Very familiar with the basics of whats needed to upgrade to a 7 mill. carbs swing arm etc. What I want to know is what are the characteristics of a 7 mill and why do most seem to do 4mill? Currently I run a stock motor with porting, cool head and all the bolt ons. +4 swing arm(moving to 6), T5 pipes(moving to in frame CPI's) Thanks for reading. People do 4 mils over 7's because you don't need to modify your cases for 4 mils. 7 mils and over you need to have your cases trenched for the crank to fit. Doesn't matter what arms you use j or a's. Are you buying a motor already put together? Or are you doing the 7 mil modification. If you are doing it your self might as well go 10 mil pretty much the same cost and both cranks require case trenching. Quote Link to comment Share on other sites More sharing options...
kjh Posted March 13, 2011 Author Report Share Posted March 13, 2011 People do 4 mils over 7's because you don't need to modify your cases for 4 mils. 7 mils and over you need to have your cases trenched for the crank to fit. Doesn't matter what arms you use j or a's. Are you buying a motor already put together? Or are you doing the 7 mil modification. If you are doing it your self might as well go 10 mil pretty much the same cost and both cranks require case trenching. Thanks for the info, I am buying one already done and its a 7 mill. It has all the upgrade parts I need. Motor, CPI pipes, full bore plastics, +6 swing arm. I figure this will be a lot cheaper than buying all the parts new. I can sell the bike with my old parts for the same or maybe a little less. Quote Link to comment Share on other sites More sharing options...
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