xtetra Posted June 7, 2008 Share Posted June 7, 2008 I have a 1981 Seca (XJ750RH) which is in need of new exhaust system. I've met Seca owners who replaced the OEM 4 into 2 systems with MAC's 4 into 1 on their Secas and were quite happy. What I didn't think to ask them was whether or not they had to change the size of the carb jets and or adjust/balance the carbs. If anyone has had any experience with this replacement/modification I'd appreciate hearing what you have to say. ie, Did you have to re-jet? Did you like the performance? How did it sound afterwards compared to the 4 into 2 etc? Thanks in advance for any input. John Link to comment Share on other sites More sharing options...
Dave C Posted June 8, 2008 Share Posted June 8, 2008 I have the xj650 with 4-1 but it was on when i got it, jets are standard and has no flat spots. I think rejetting only becomes an issue if you fit pods aswell. Link to comment Share on other sites More sharing options...
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