I recently added new hines pipes to my 2005 650 v-star classic and did as recommended and bought the hines jet kit to accompany it also. pipes work great but when i put the jets in it would idle fine but once i would ask for power it would cut to 1 piston.
Pull the breather cover off and see how it does it sounds like you need more air going in when you go up on jet size it will change the air fuel ratio thus making it lack power or just run absolutely funny
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Just an air filter then no jets but with a full exhaust straight through I would definitely do it. If you don't you might get the odd small flat spot. I can't recommend the jet kit but rolling road tune would be beneficial and eek out all possible power . Nick.
Your right about the fuel injection versus the carborater and your also advised right to go to the open pipes and ait inlet the jeting or the computer will have to be adjusted to reset the mixture so the engine dowes'nt back fire and hesatate. and generally run ratty. Your star is likly to have a carb and it's also likly to be jetted OK for the open pipes already. It'll likly run even if it's off just how bad is yet to be seen. Most of the time it'll idel but after that the problems start as you open the gas. Sputter and stall right off idel are common, even hi cruise ( steady fast idel) will back fire and even set the carb on fire as it stalls. If this happens restart the bike right away as the fire will be scucked rright back inside the engine. A stage 1 or even stage II jet kit can be bought from bikebandit.com. Following the instructions that com with the kit you can tune out all these bad trates that the loud itake and loud exhaust cause. If you've never ridden a loud bike before and I'd advise rinning one first as the excessive load on your ears and your tictet level at the pay window at the police station may have you wishing you never fooled with it.. The loud pipes will give you the impression of more power but it really gives you an uneven power brand that the V-Star makers worked so hard to get and pass exhaust rules. I also noticed a loud piped 1100 star tried to gun me down the road the other day and with all my camping gear and my wife on the back of my 650 Suzuki I managed to run right with him as he ran his bike as hard as he could. If the mufflers were right he'd have run off and left me. Before I would ( fix )this bike this way I'd make some timed runs with it to see just how fast it is now. Get someone holding the clock to start you at one pole and have him at the next pole to stop the clock. Make a few runns so you can get your best time.. You might have to run it a few times to find the best way to go the fastestest. If you can get times about the same ( inside of 1 /10 sec. Then after you (work) on it make sure the ( repairs) did'nt kill the speed. Top speed at the second pole will also work but it's not as good of an indication on whats happening. Do your test at a place where you know you can come back ti it later, and nor get arrested for running as fast as you can. 0-60 is also a good test except it's hard to clock it good and or the distance to get there as expensive equipment is needed to get meaningful results. A little off in recording the results is alot of performance difference. bikebandit.com and cheapcycleparts.com can both sell you a repair manual by Clymer ( aftermarket publishing co.) that'll give you ideas and pictures of the repair procedures to help you work on your bike. Pay attention to the speciel tools and workshop work areas they recommend as their right ( for sure). Any job you get into and you can't finish it put it all the way back together. as it does'nt save any time at all as parts get misplaced and your memoery may not remenber just how it goes and the next thing you know your having to hire the work done and I charge alot more if it's been took apart not by me.
The jets are for increased performance but the jets installed must be in relation to the pipe used. An open pipe would require larger jets. If the jets came with the pipe when the previous owner purchased it, then it should work. My advise would be to tune it up, sync the carbs, and time the sparks.
If all else fail, ask the previous owner to provide the stock jets and replace it. Stock jets along with the stock pipe will almost always run the first time. Sync the carbs and tune timing. If you have it all running smooth, from there you can do upgrades like stage 1 jet kit or purchase a performance exhaust.
Please do let me know if any of this was helpful, I'll follow it up should my suggestions fail,
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)
Well, yes it is somewhat normal, you have hot rodded it up. What happens is a bit of unused gas now gets buy the cylinder and explodes in the pipe instead of the cylinder. It happens due to scavenging, the new shorter pipes and the better filter allow more fuel to move quicker. If she has a carburetor it will need to be re-jetted but still may shoot flames. If fuel injected she will need dealer help.
general rule of thumb is to go up about 10 jet sizes,unfortunately it is a bit of trial and error,and you may have to swap out diferrent sizes to get the bike running right,(jets are quite cheap though)but first step about 10 sizes from standard,your local dealer should be able to tell you what jets are in it and supply replacements,if you change to a hgh flow aftermarket air filter you may have to change jet sizes again as changing the filter may effect the mixture ratio in the carbs,,hope this helps