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Discussion Starter #1
Hi ! I’m new. First post here.
Is it a good idea too do both of this modification on a brute 650i 2007.
(Open exause / 12 holes air box) and adding a (electric fuel pump /ms mod)
I know i will have too rejet.
I have à dynatech box and
Vfj clutch kit.
 

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Nope...not unless you want to go up 6-8 jet main jet sizes. These were made to have some restriction on the air boxes for EPA requirements. Even the carbs..the CV-K series was made to have a certain level of vacuum on the horn side of the carb. You take that away and it won't run for sh*t....unlike the Vs. You can increase the main jet sizes to make up for part of it...like we did to the Vs..but these still won't run right. A low pressure..ie 3.5psi or less...is always a good idea. Be sure to leave the selector on PRI.
 

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Discussion Starter #3
Ok thank’s, both mod is not a good set-up.
So Which option will be the best.
I open the exause all ready. ( i still have a stock one)
12 holes air box.
Or
Adding a electric pump and keep stock air box.
 

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Super Moderator
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13,702 Posts
Ok thank’s, both mod is not a good set-up.
So Which option will be the best.
I open the exause all ready. ( i still have a stock one)
12 holes air box.
Or
Adding a electric pump and keep stock air box.
None realy. The 12-hole box mod is out 100%. Opening up the exhaust will drop the engine's ability to scavenge which will effect the bottom end. And the electric fuel pump is only needed if the stock pump fails. Just tune it properly...with the proper jets for your altitude is the best thing you can do.
 
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