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Group: Forum Members
Last Login: 3/5/2007 10:44:31 AM
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| I am looking at a used bike after over 20 years. It will be a cruiser (probably a Kawasaki 800 classic, Suzuki 800 Volusia, or Yamaha 1100 Custom). Most of the ads I see state they have custom pipes like Vance & Hines or Cobras. Some say they have been rejetted and some do not. What does rejetted mean and is there any correlation between the pipes and rejetting? I saw a comment on this website from a rider that said something about the back-pressure from different pipes damaging the engine if it was not tuned correctly and I would like to know if this is true when I look at used bikes.
Any advice is appreciated.
Alan Frazier |
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Group: Forum Members
Last Login: 3/5/2007 10:44:31 AM
Posts: -1,167, Visits: 2 |
| | We have an 800 Classic, 2001. Love it. We did rejet the carborator when we added cobra pipes. Necessary to do so you do not have damage. Also added a hypoercharger to add some hp. We love it alot and are now selling to upgrade to a 1500 classic. We began riding again after 20 year off time and now think we would like bigger bike with bigger saddle bags, etc. for longer travel. |
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Group: Forum Members
Last Login: 3/5/2007 10:44:31 AM
Posts: -1,167, Visits: 2 |
| All new bikes are set to run very lean to pass EPA standards. If you put aftermarket pipes on your bike you will alter this setting. If you don't rejet the carb it can burble or backfire when decelerating. By rejetting the carburator you are adding a bigger jet for more fuel. It will run better and sound great. The performance of my 800 classic got much better and the engine felt smoother and freer running. It did lose some gas milage though. It went from 49mpg to 45mpg, but it was worth it. It installed muzzy drag pipes and a cobra jet ket for around $300.
Bill |
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Group: Forum Members
Last Login: 3/5/2007 10:44:31 AM
Posts: -1,167, Visits: 2 |
| Aftermarket pipes allow the exhaust gases to pass quicker, more easliy from the engine, this reduces the backpressure to the engine. By doing this you are affecting the fuel air mixture coming into the engine, it will go leaner, more air into the engine but not more fuel. This will cause the combustion chamber temperatures to go up and can cause damage to the engine, burnt valvles or even pistons. Rejetting the engine is replacing the stock carb jets with larger ones, this allows more fuel to flow and gets the fuel air mix back where it belongs, reducing the combustion chambers temps back to a normal range. You can see the temp in the combustion chamber by examining the spark plugs. Black or very dark brown, too rich. White is too lean. You are looking for a tan.
Hope this helps.
Doc Thompson |
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