are there after-market exhaust that do not need rejet carb for 2003 yamaha v-star 650 custom?

by Hello Mails
Posted February 17th, 2010 at 5:01 pm

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?

5 ResponsesLeave a comment

Maddog S
February 17, 2010 at 5:08 pm

if the new ones supply about the same amount of back pressure etc. no problem,just check with your supplier

[Translate]
Tom B
February 17, 2010 at 5:13 pm

NO, you don’t have to re-jet the carb when you install a aftermarket exhaust
install the new exhaust pipes and IF the bike backfires under deceleration then you need to re-jet it, but if it don’t backfire, don’t jet it.
re-jetting only works when you open the air box up and give it more intake air
if you do re-jet it, its easy, just change the main jet to size ‘115″ and leave the pilot jet alone and don’t buy an expensive re-jet kit, just go to the dealer and spend a few dollars on 2 size “115″ jets
I know many people that leave the jetting alone with loud pipes and have no problems, re-jetting will give you more power and less gas mileage

[Translate]
greybeard
February 17, 2010 at 5:33 pm

follow the exhaust makers recommendations some do some don’t

[Translate]
rodnocker1959
February 17, 2010 at 6:30 pm

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

[Translate]
double o
February 17, 2010 at 6:31 pm

V & H Cruzers exhaust sound great on a XVS650 and run well without rejetting.

[Translate]

Add a commentGet a Gravatar

M	T	W	T	F	S	S
« Apr
		1	2	3	4	5
6	7	8	9	10	11	12
13	14	15	16	17	18	19
20	21	22	23	24	25	26
27	28	29	30	31