re-jetting?

[dennis]

I bought some after market slash cut pipes by Jardine for my 07 Rebel 250. Will I need to have the carb re-jetted? If I don't have it re-jetted what risks do I take? Also how does one re-jet a carb? Any advise would be most helpful!

[GearJammer]

As far as I know, the only complete aftermarket pipes offerred for the 250 Reb were the Jardines & the Mac's.....(one or the other may have been discontinued, altho' probably still available if one can find a used set)

Someone please correct me if I'm wrong, but I believe that these aftermarket pipes are/were advertised as "requiring NO re-jet" & as long as you're keeping the stock airbox in place, you should probably be O.K. Just please keep an eye on your spark plugs reads for awhile to insure that they're lookin' to be in the safe range: Light tan being ideal, any signs of "white" indicating a need for a re-jet as "white" indicates TOO lean.

The risks of altering pipes, removing stock airbox, etc. are that the motor, which is already set factory lean, might get pushed over the edge into the dangerously "too lean" area, but again, just changing the pipes alone might not be a problem in this way.

[b4v4]

I've seen, with other motorcycles, anyway, that too often when they say, "No jetting necessary", they should still be jetted. It's not a big deal, at all. Especially on a single carb, like your 250 has. I would go online to either Jardine's website, or maybe Dynojet's website, and see what they have to say. If there is a phone# available, all the better. Jets are cheap, and other than pulling the carb (not tough) easy to install. The combination of the pipes AND the jet kit will give you a noticeable horsepower improvement. Just changing the pipes will sound cool, and give you the illusion of more power, but, as Gearjammer said, you run the risk of running lean, and burning a hole in the piston.