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| | | Forum Newbie
Group: Forum Members
Last Login: 4/14/2007 7:15:02 PM
Posts: 1, Visits: 15 |
| | i'm adding some jardine slip on exhaust to my spirit and i was wondering if anyone had done this without rejetting and with rejetting and what the results were, i've heard alot of people say they rejetted with new pipes and lost alot of fuel milage, well what would happen if you didn't rejet? |
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| | | Forum Newbie
Group: Forum Members
Last Login: 4/19/2007 3:19:31 PM
Posts: 2, Visits: 3 |
| | You won't know till you swap them. Then under heavy deceleration in gear, if you hear backfiring like the fourth of July, you may need to rejet. Sometimes, you can get away with turning the idle screw out to about 3-3.5 turns. If that isn't enough, you will have to rejet. If you don't your running lean and over time, it will hurt your engine. An occasional backfire is normal. Check your plugs after a ride, lean is white, brown is just right. |
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| | | Forum Newbie
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Last Login: 6/6/2007 8:25:44 AM
Posts: 1, Visits: 3 |
| Hi, The factory exhaust, intake air filter and carb jetting are a balanced and tuned setup. If you change any of the three, the other two will most likely need to be changed as well or the engine will suffer. People usually go to the loud pipes because they like the cool sound or they want additional horsepower. And while more ponies can almost always be gained by opening up the exhaust, the increased airflow of the engine (caused by less restrictive exhaust) will require additional fuel for the air-fuel mixture taking place in the carb. Otherwise the engine starves for fuel and creates a lean condition which makes it run much hotter and too much heat will shorten the engine's lifespan and make ugly out of your nice chrome header pipes. You mentioned fuel mileage suffering and it most certainly will. I have a 97 VT1100 (all stock) and I get 46 MPG in mixed driving. I know a guy who has the same exact model and year; he put on Vance-Hines pipes, K&N air filter and re-jetted the carb and he now gets 30 MPG. Sure he can outrun me on the straight aways, but I always pass him at the gas station.  |
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| | | Junior Member
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Last Login: 2/22/2008 9:05:10 PM
Posts: 10, Visits: 130 |
| | Don't rejet or change pipes...Your gas milege goe's to pot and it doe's not sound good....only louder. Suggestion.....Drill a 3/8" hole under the first baffle....this is a pressure point where the exhaust emptys into the muffler. It sounds good and there no need to rejet. Runs a little smoother and the gas milege stays the same. Ride safe....Richard. |
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| | | Forum Newbie
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Last Login: 7/17/2007 9:25:58 AM
Posts: 6, Visits: 33 |
| I recently picked up a used 2002 Shadow Spirit 1100,
it had already had been modded with pipes, jet-kit, K&N etc.
This weekend I checked the mileage with the wife ridding with me and it was only 36mpg... I was thinking, Man that is low.
Now this thread tells me why. He gave me the stock pipes...
if it does not go back up with 93 and just me on it I may put it back to stock seeing I got the bike for daily ridding for fuel savings and weekend riding with the wife.
Red 2002 Honda Shadow Spirit 1100
Vance-Hines pipes, K&N air filter, Jet kit to match pipes,
Memphis Fats 19 inch windshield, crash bar, Saddlebags |
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| | | Forum Newbie
Group: Forum Members
Last Login: 4/13/2008 8:39:23 AM
Posts: 2, Visits: 3 |
| | Sorry, but that's all a load of nonsense. I have a 2004 Spirit 1100 with V&H pipes, K&N air filter and jet kit. Sounds great, runs great, and still consistently get 53 mpg. More power, same fuel economy. If you're getting very low mpg, I'd suggest having your local Honda mechanic investigate. It's not the pipes, jet kit and air filter. Gotta be something else. |
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