hi just wondering if anyone might have a rough idea about whats going on with my 1999 rrx. i done a full service with new k&n air filter and changed the standard exhaust for a mtc gp race can. now the bike accelerates perfect but if you let off the throttle and then twist back on the throttle the bike stutters a bit almost like running out of fuel just for a second then pulls like a train until i let off the throttle again and back on and little stutter. i am thinking may need a set of jets i know the bike was completely standard when i bought it. any one else have any idea what might be causing this before i go spend £120 on jets cheers all in advance.

 

If the problem started right after you installed the K&n and exhaust, I would assume that air to fuel ratio is off a bit. I would install some new jets (just one size up) and see if that helps!

 

This is most likely a jet issue. Your airfilter and zorst upgrades have pretty much made your jets insufficient. Try installing a stage 1 Dynajet kit. This should smoothen things out a lot...