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I have a 02 pro x 440 and befor it would do 90 95 easy but now it only does 70 and I changed both pulgs so I dont know what it is does any one know if you do please help me out thanks alot !!!
 

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check your belt       other than the plugs fouling thats the only other thing that can wear out      also, did it just all of a sudden do this(like one day it was running good the next ....)   or was it a slow process?
 

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prox440  make sure you are getting good gas, and it is always a good idea to use isopropyl alcohol in your gas.  
wow you say you are getting 90 to 95 miles per hour out of a 440 fan? i find this a little high because my 2000xcsp600 with 23/40 gear ratio @ 8250 rpm only gets 96 miles per.
 
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