Question about 2007 Yamaha V Star Custom

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Exhaust basically i wanna know if i need to re-jet the carb if i modify the exhaust to my 2003 yamaha v-star 650 custom, i saw guys online (on youtube) how they put on after-market exhaust to their bikes saying no re-jet. is this true? is it ok to do?

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The best way to do this is buy the aftermarket exhaust and keep the baffles in the exhaust and run it for 50 or so mile then pull out one of the plugs and if its gray you are fine if its white or black you will have to rejet

Posted on Nov 10, 2008

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650 v star runs cold out of exhaust pipe until I pull choke then it acts like it wants to run for a second


Hi, Anonymous and the usual suspects are:
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2. Fuel filter clogged.
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7. Idle adjusting screw set too low.
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1 Answer

My 2002 yamaha v-star 1100 classic is backfireing how do i fix. do i need to jet the carbs if so how????


Is the bike backfiring from the exhaust or the carburetor? Does the bike have stock or aftermarket exhaust?
D.

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2 Answers

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


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)

Sep 09, 2010 | 2003 Yamaha V Star Classic

1 Answer

2003 WR250F, exhaust gets red hot very quickly?


souds like a lean condition,have you rejetted carb or modified the air box ? or changed exhaust,if so you need a larger main and possible pilot jet.If you only notice it at night,maybe normal if you havn't done any mods....

Apr 06, 2010 | 2003 Yamaha WR 250 F

1 Answer

81 xj650lh midnight maxim black exhaust, sooty plugs keep fouling


hi,fairly common problem with modified exhaust,start with the pilot screws,turn right in untill the screws are firm then back out 1 and 3/4 turns,this is a fairly standard rule of thumb that will get most things going,as far as the jets go,the original size would be a good starting point,but you should only need to go up 10-15 sizes to compensate for the exhaust mods(ie stock might be 127 may need to go to138 or 140 etc),the other thing that i would recommend is getting hold of a set of damped carb balancers these will enable you to get the mixtures and carb balance dead right,they are relitively cheap and easy to use and will have paid for themselves the first time you use them.(i regularly get 4-8 sometimes 10-11 extra hp over stock by tuning the carbs up properly).hope this helps

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1 Answer

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First off did you buy it new? Second has it gone through its break in tune up yet?Did you do the re jeting? My guess is it was re jeted wrong & neeeds to be re jeted again or could also need more air(upgraded air kit) or a tfi or power comand fuel mod.My bike also poped untill I did the air & fuel upgrades & them upgrades will also give you a much needed house power needed for this rig.


Bring it to a shop & have it looked at.......


Good luck

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1 Answer

Exhaust getting hotter than normal


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.

Nov 28, 2008 | 2004 Yamaha V Star Classic

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