Question about 2003 Yamaha V Star Classic

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I need to know if i have to re jet my 98 yamaha 650 v star if i put on the vance and hines cruzer exhaust just the exhaust nothing else. and also what type and size of jets to use

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  • ukillmewell Sep 09, 2010

    ahh see that would be bad damaging the pistons.... and i assume that riding it hard even if it is running a little lean would ultimately deteriorate the motor in the long run. probably in my best interest to just **** it up do the intake exhaust and jets all at once that way i wont have to worry about it.... as far as the jets go, i noticed you mentioned a few, is there any kind of specific kit i have to have to just any run of the mill dyno jet stage 1 kit for my bike will do? thanks for all your help heimlich you seem to really know your stuff.

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You can try driving the bike after the install. After you change the exhaust it will run lean. You may want to coat the inside of the mufflers with an anti blu-ing agent or your headers will discolor. If when test driving you notice the bike has developed a flat spot in the acceleration curve you will want to re-jet the carburetors. The easiest way is to buy a jet kit from Cobra, Dyna-jet,etc.($80-$100). Other wise you can just buy several sets of larger jets and change them out till you are happy with the way it runs. Most people that change the mufflers and put in a jet kit, also install a K&N air filter .
More air flow + fuel flow = more exhaust flow (more power)

Posted on Sep 09, 2010

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  • ukillmewell Sep 09, 2010

    thanks for all the info. i guess what i'm really wondering is do i HAVE to. i understand with the increased air flow the bike will run a bit lean. but if the air flow is still restricted at the intake is re jetting really necessary? i know i can monitor the bike look at the plugs see if they turn white or have carbon build up etc. but its really confusing because some people say they don't do it and everything is fine and others say you absolutely have too! i am not really concerned with power i just don't want the bike to sound like a rc toy anymore.

  • David Belcher
    David Belcher Sep 09, 2010

    No you do not have to. But you will definitely blue the exhaust(that is why I recommended coating the inside of the muffler so it stays looking nice). I said to try the bike with out re-jetting( meaning to be careful , like you said , checking the plug color). See you have a flat spot when you twist the throttle. Then you can decide if you can live with it or not by how bad it is. If the bike falls on its face hard when you crack the throttle you can always pony up the money and fix it with a jet kit later. Remember if you are running lean and you push it too hard , you could damage the pistons.

  • ukillmewell Sep 09, 2010

    hh see that would be bad damaging the pistons.... and i assume that riding it hard even if it is running a little lean would ultimately deteriorate the motor in the long run. probably in my best interest to just **** it up do the intake exhaust and jets all at once that way i wont have to worry about it.... as far as the jets go, i noticed you mentioned a few, is there any kind of specific kit i have to have to just any run of the mill dyno jet stage 1 kit for my bike will do? thanks for all your help heimlich you seem to really know your stuff.

  • David Belcher
    David Belcher Sep 09, 2010

    Manufacturers always set up for sea level , De-tune everything, and set it a little rich just so you get a longer life out of the motor. Be sure to use the anti- discolor coating . Original equipment uses double wall pipes , the inner wall blues(you can't see it) , and the outer chrome stays looking nice. After market systems are mostly single wall pipes and are prone to bluing on the ride home from the installer.

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The Simple Answer is NO. You do not HAVE to rejet but you can if you wish.

Posted on Oct 14, 2010

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1 Answer

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No it will not. You probably don't NEED to rejet at all. If the manufacturer suggests it for your bike and pipe combination I would follow their advice. If they do not suggest it I would use a dyno to get the best performance from your new setup. Keep in mine your new exhaust only lowers the back pressure. You haven't changed the intake parameters at all as far as airflow. So any additional air going into the cylinders due to your new exhaust will only be because of the reduced volume in the cylinder while the intake valve is open. This is a rather small amount, so don't get all crazy and jump several jet sizes at once.

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Jan 14, 2009 | 2004 Yamaha V Star Classic

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when you installe new pipes you lost some back pressure this means you engine is now breathing better and so you need to adjust your carbs by rejetting to a richer jet.

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