Tommygunn Posted February 28, 2014 Report Share Posted February 28, 2014 I went from Pro Circuit Pipes to Shearer SB in frame drags. Should I rejet? I'm guessing bump up the mains if so? I'm running 36mm carbs. Quote Link to comment Share on other sites More sharing options...
RadarRacing Posted February 28, 2014 Report Share Posted February 28, 2014 It really depends on your motor , timing , dome , porting etc. Topend pipes stuff the fuel air mixture back into the cylinders more at upper rpms and maybe less so in the midrange. Thats why it is necessary to check plugchops with a pipe swap. Make sure you check half throttle as well as full throttle totally wound out. It could be richer or leaner and definately make sure it isnt lean at part throttle and rpms to be safe. Quote Link to comment Share on other sites More sharing options...
Nightmare Posted February 28, 2014 Report Share Posted February 28, 2014 I went up 2 sizes when I switched from t5 but yes it depends on the motor and what not. Sent from my XT1080 using Tapatalk Quote Link to comment Share on other sites More sharing options...
bluebanshee98 Posted February 28, 2014 Report Share Posted February 28, 2014 Usually up 1 or 2 sizes but plug chop will confirm that Quote Link to comment Share on other sites More sharing options...
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