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Old 04-28-2011, 03:53 AM   #1
CombatM0NKEY
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pipes..

If my bike has straight pipes.. do I HAVE to get a tune? or is tuning only for FI engines? Still new and learning.. anything helps.. thanks.
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Old 04-28-2011, 06:45 AM   #2
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Old 04-28-2011, 06:46 AM   #3
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On a carbed bike you would jet the carbs
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Old 04-28-2011, 10:21 AM   #4
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I think he's on a 750 Shadow. Are your pipes discolored? If so, I'd say you're running lean & need a re-jet. Running lean ==>hotter engine==>hotter exhaust==>heat discoloration. If not, chances are the carbs are already jetted.
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Old 04-28-2011, 10:50 AM   #5
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If you increase exhaust you are really only doing 1/3 of the equation and that's not a good idea. The total equation would be intake, fuel, exhaust.
You need to install an aftermarket air intake (or just a better flowing filter like K&N), re-jet the carb, and install the pipes.

Just opening up the exhaust so it sounds different may or may not cause you to need to re-jet the carb, but it also won't really give you ANY performance gains if you ignore the other 2/3 of the equation.

My advice...save up the cash and do all 3 at one time. NONE of it is difficult and can be accomplished in an hour or 2 in the garage with basic tools.
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Old 04-28-2011, 11:51 AM   #6
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Quote:
Originally Posted by KSims1868 View Post
My advice...save up the cash and do all 3 at one time. NONE of it is difficult and can be accomplished in an hour or 2 in the garage with basic tools.
The carbs on a Honda Shadow are burried pretty deep and should probably be synced. Unless you are really good it will take longer than just 2 hours. Other than that I agree with you.
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Old 04-30-2011, 02:15 AM   #7
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the rejetting.. I've never done.. i have a 600 BTW..
I worked on my car before having a bike.. so the carbs a little different.
Pipes came with the bike, no discoloration. pipes do some pops here and there when decelerating. I've played with the little under the choke to enrich the fuel a bit for the cold starts and lower it down when its' warm. what's "rejetting" the carbs?
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Old 04-30-2011, 02:16 AM   #8
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Quote:
Originally Posted by C.Hern5972 View Post
Year
Make
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1995
honda shadow
600.
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Old 04-30-2011, 08:45 PM   #9
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Aftermarket pipes increase airflow through the motor. Rejetting is replacing the the orifice that control how much fuel goes through the carbs. It is necessary after increasing the airflow to prevent the motor from running lean.

If I'm not mistaken, backfire on decel when the motor is at operating temp means it's running lean. The air mixture screw adjustment can help, but it's not a definitive fix. Honestly, you're probably not going to get much out of a 600. Go to dynojet.com & look at the jet kit for your bike. You will find a before & after dyno sheet. It'll show you the power gains you'll get from jetting & pipes.

Since your bike has straight pipes, it's probably already been re-jetted, but it may not have been jetted properly for the pipes.
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Old 05-02-2011, 09:37 PM   #10
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by you saying I won't get much out of rejetting.. I'm assuming as far as power gain. I'm not really caring much for the power gain as far as rejetting goes but more on the Long run for the life of the bike. I'm not planning on letting the bike go because I'm a sentimental wuss and don't really need to let it go. =P

1. would it pose problems if I don't rejet it?
2. I did see discoloration on the pipes about 6inches out from the connection to the motor.
3. would wrapping help? or is wrapping just for temperature protection so it doesn't melt . IE. skin.
4. you guys are awesome!.
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Old 05-03-2011, 06:12 AM   #11
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I'd venture to say the bike has already been jetted. The discoloration is at the hottest point of the exhaust. Discoloration from improper jetting usually involves more of the pipe (extends further from the motor). Wrapping will keep some of the heat from radiating outward to your legs (keep things from melting), and it will keep more of the heat inside your pipes, so if/when you take off the wrap, more of your pipes will be discolored from heat. I think wrapping pipes is a cool look on the right bike.
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