ok ive heard that u only want buy a jet kit if your always going fast like racing. if i get one for trail riding will it mess anything up or was i just told a lie

 

jet kits are sometimes needed for a variety of reasons. well, basically just one reason, and that's to provide the correct fuel-to-air ratio. the reasons this needs correcting is varied, but most companys provide vehicles jetted lean for economy and emissions reasons. then, higher altitude and any performance mods (even an aftermarket air cleaner) will often require changing jets. the bottom line is, look at your spark plugs and if the part that goes into the cyllinder head is some shade of brown and you are satisfied with the performance, leave it alone. if the plugs are white on the business end, it is running too lean. this has to be corrected. the lean condition is very hard on the engine. if the plugs are black, it is running rich or burning oil that has blown by the rings. the black plugs, if they do not foul often, are not cause for alarm. just an indicator that your jetting is not right for best performance.

this is the quick and dirty method of checking your jetting, and while easy and fairly accurate, it not as good as having your quad ran on a dyno with sensors hooked up. most of don't have access to a dyno so the plug color and seat of the pants is what we have to use.

changing jets is hit and miss, so once you start, you might get it right the first try, or you might be changing jets four or five times to get it how you want.


BTW this only applies to 4 strokes. i haven't messed with two strokes enough to have any advice.

monty

 

It doesn't matter if you race or ride trails. The correct air/fuel ratio will benefit both applications. Most of the jet "kits" I have seen are performance upgrades made for bikes that have been piped, bored etc. They usually come with a range of main jets, a "richer" needle and if the carb is a CV type, a lighter diaphram spring. If you put one of these in your bike and the ratio is correct it isn't going to hurt anything.

 

About all I do is Trail ride,I have a cam and a power module and a jet kit in my BF750.It does nothing but help.You wont mess anything up.