2007-06-19 16:24:13 · 8 answers · asked by fokker_triplane 1 in Cars & Transportation ➔ Motorcycles
The answer to this one depends on the exhaust. There are some on the marker which do not require rejetting, they may sound a bit different than stock but the airflow is the same. Most do need it, as they flow more air, and will lean out the fuel mixture, which, especially on an air cooled bike, will certainly damage the engine. When you install the pipe, take a ride, try to stay away from heavy traffic, so you can pay some attention to the bike,a nd the way it runs/sounds. See if the throttle response is the same or better than before.
or if it runs any hotter. Come to think of it, you should have a look at the plugs before start of the trip, if they are not medium tan, replace them before the trip. Put some miles/time in this ride, come home and pull the spark plugs. If they are very clean, and whitish, you are too lean. A medium tan, you are good to go. Black, you are too rich, maybe the new pipe is not as good as the stock exhaust??? If they are whitish, go one or two jet sizes larger, and place one or two small steel washers under the head of th eneedle, to raise it a bit. These washers should be 0.015 > 0.020 in. thick. This will do a very good job of what expensive kits are supposed to do.
Tomcotexas
2007-06-19 17:06:45 · answer #1 · answered by tomcotexas 4 · 2⤊ 0⤋
After market exhaust systems reduce weight and therefore do improve handleing. After market exhausts reduce back presure. Which has the effect of raising the power band. It will lower low rpm power while increasing mid and upper rpm power. So, many people replace the stock system because of sound. I happen to like quiet motorcycles and I really enjoy being able to ride through residential areas after midnight. But, many people want a bad boy sound. The facts are that aftermarket exhausts at most give you a 5% gain in power and typically a 5% loss in fuel economy. The weight they take off the bike is only noticable to people that time lap times. When you install an aftermarket exhaust you will need to either re jet the carbs or re map the fuel injection.
2016-04-01 06:34:26 · answer #2 · answered by Anonymous · 0⤊ 0⤋
tomcotex has a good answer.
Improving exhaust flow makes the bike run leaner (more air than fuel) because there is more air going in. However, the engine will also run somewhat cooler because there is less exhaust restriction and that compensates a bit for the lean condition.
2007-06-19 17:28:20 · answer #3 · answered by Deckard2020 5 · 0⤊ 0⤋
It may not be necessary, but most likely. Check your plugs and see if it's running rich or lean, after you rip the engine on a good straight away. You may have to rejet it accordingly.
2007-06-19 18:09:19 · answer #4 · answered by Anonymous · 0⤊ 0⤋
99 percent of the time, YES!
A freer flowing exhaust will run lean unless you rejet the carb/remap the injection system.
2007-06-19 22:45:49 · answer #5 · answered by strech 7 · 0⤊ 1⤋
NO, only if you change the air intake do you need to rejet.
Most bikes are set lean from the factory for emisions so it will help, but not manditory.
2007-06-19 16:39:56 · answer #6 · answered by Chad F 5 · 0⤊ 1⤋
is all about the right air fuel mixture, you dont have to get the jet kit or power commander but it wont run smooth and will backfire often. get it and youll be glad you did.
2007-06-19 20:31:58 · answer #7 · answered by ROBERT G 3 · 0⤊ 1⤋
yes if not you may over heat the motor.
2007-06-19 16:36:25 · answer #8 · answered by Anonymous · 0⤊ 0⤋