Carb rejetting

Sigwings wrote:
 > You should be able to adjust the mixture screw to take care of the
 > idle/starting issues.
 >
Such was my thinking. I freely agree that rejetting might add even
more power, but....required???????? I suspect that a LOT of what's
"required" is only required as a jobs program for dealer mechanics.
grin

cheers

bob

 >
 > "bob" <robob68.DeleteThis@earthlink.net> wrote in message
 > news:1117117932.718901.139670@o13g2000cwo.googlegroups.com...
  > > Just how important is it, really, to rejet the carbs when installing
  > > slipons?
  > >
  > > I have spoken to several people with VSTARS (mine's a 650) who've
  > > installed pipes and not rejetted. The only thing they report is some
  > > backfiring...which I already have on my 2002 with stock pipes.
  > >
  > > I'm thinking about trying it along with K & N's new (to me at least)
  > > high flow replacement filter element.....about 50 Bucks vice the $150
  > > it costs to replace the whole assy.
  > >
  > > The dealer tells me (and why do I grab hold of my wallet whenever he
  > > speaks???) that the bike would not idle and be hard to start.........
  > >
  > > cheers
  > >
  > > bob
  > ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Carb rejetting 

I have a 2004 v-star and replaced the exhaust with BUB exhaust. They
were the only exhaust modifications that do not require rejetting per
tech support they offer the same back pressure as the original system.
As far as the backfiring I had the same problem,Try temporarily
disabling the AIS system There's a quick guide at the bottom of the page
it only takes 5 min to disable it

<a style='text-decoration: underline;' href="http://www.star-riders.org/starcruiser/volume4-1/ais_1100.html" target="_blank">http://www.star-riders.org/starcruiser/volume4-1/ais_1100.html</a>





 > You should be able to adjust the mixture screw to take care of the
 > idle/starting issues.
 >
 >
 > "bob" <robob68.DeleteThis@earthlink.net> wrote in message
 > news:1117117932.718901.139670@o13g2000cwo.googlegroups.com...
  >> Just how important is it, really, to rejet the carbs when installing
  >> slipons?
  >>
  >> I have spoken to several people with VSTARS (mine's a 650) who've
  >> installed pipes and not rejetted. The only thing they report is some
  >> backfiring...which I already have on my 2002 with stock pipes.
  >>
  >> I'm thinking about trying it along with K & N's new (to me at least)
  >> high flow replacement filter element.....about 50 Bucks vice the $150
  >> it costs to replace the whole assy.
  >>
  >> The dealer tells me (and why do I grab hold of my wallet whenever he
  >> speaks???) that the bike would not idle and be hard to start.........
  >>
  >> cheers
  >>
  >> bob
  >>
 >
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Carb rejetting 

The only way to know is to put on the exhaust system, drive it and see if
you have any problems and check the plug trouble. You probable won't have
to re-jet for exhaust only changes, but if you free up the intake as well...


"bob" <robob68 DeleteThis @earthlink.net> wrote in message
news:1117201858.217135.146840@g14g2000cwa.googlegroups.com...
 >
 >
 > Sigwings wrote:
  >> You should be able to adjust the mixture screw to take care of the
  >> idle/starting issues.
  >>
 > Such was my thinking. I freely agree that rejetting might add even
 > more power, but....required???????? I suspect that a LOT of what's
 > "required" is only required as a jobs program for dealer mechanics.
 > grin
 >
 > cheers
 >
 > bob
 >
  >>
  >> "bob" <robob68 DeleteThis @earthlink.net> wrote in message
  >> news:1117117932.718901.139670@o13g2000cwo.googlegroups.com...
   >> > Just how important is it, really, to rejet the carbs when installing
   >> > slipons?
   >> >
   >> > I have spoken to several people with VSTARS (mine's a 650) who've
   >> > installed pipes and not rejetted. The only thing they report is some
   >> > backfiring...which I already have on my 2002 with stock pipes.
   >> >
   >> > I'm thinking about trying it along with K & N's new (to me at least)
   >> > high flow replacement filter element.....about 50 Bucks vice the $150
   >> > it costs to replace the whole assy.
   >> >
   >> > The dealer tells me (and why do I grab hold of my wallet whenever he
   >> > speaks???) that the bike would not idle and be hard to start.........
   >> >
   >> > cheers
   >> >
   >> > bob
   >> >
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Carb rejetting 

Sigwings wrote:
 > The only way to know is to put on the exhaust system, drive it and see if
 > you have any problems and check the plug trouble. You probable won't have
 > to re-jet for exhaust only changes, but if you free up the intake as well...
 >
 >
 >
Exactly why would that cause problems?

cheers

bob<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Carb rejetting 

This message is not archived
 >> Stay informed about: Carb rejetting 

If the bike is backfiring, that is a sign that it is running lean and this
is very bad for your engine. It generates more heat and you could end up
cooking a piston or ???

You can try adjusting the idle mixture screw as it will help at lower rpms.
Once you have it 'just right', take it for a highway run, shut it down and
pull the spark plugs. If they are white it is still too lean and you will
need to reject.


"bob" <robob68.TakeThisOut@earthlink.net> wrote in message
news:1117117932.718901.139670@o13g2000cwo.googlegroups.com...
 > Just how important is it, really, to rejet the carbs when installing
 > slipons?
 >
 > I have spoken to several people with VSTARS (mine's a 650) who've
 > installed pipes and not rejetted. The only thing they report is some
 > backfiring...which I already have on my 2002 with stock pipes.
 >
 > I'm thinking about trying it along with K & N's new (to me at least)
 > high flow replacement filter element.....about 50 Bucks vice the $150
 > it costs to replace the whole assy.
 >
 > The dealer tells me (and why do I grab hold of my wallet whenever he
 > speaks???) that the bike would not idle and be hard to start.........
 >
 > cheers
 >
 > bob
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Carb rejetting 

"bob" <robob68.RemoveThis@earthlink.net> wrote in message
news:1117117932.718901.139670@o13g2000cwo.googlegroups.com...
 > Just how important is it, really, to rejet the carbs when installing
 > slipons?
 >
 > I have spoken to several people with VSTARS (mine's a 650) who've
 > installed pipes and not rejetted. The only thing they report is some
 > backfiring...which I already have on my 2002 with stock pipes.
 >
 > I'm thinking about trying it along with K & N's new (to me at least)
 > high flow replacement filter element.....about 50 Bucks vice the $150
 > it costs to replace the whole assy.
 >
 > The dealer tells me (and why do I grab hold of my wallet whenever he
 > speaks???) that the bike would not idle and be hard to start.........
 >
 > cheers
 >
 > bob
 >

It is fairly simple---if you are just opening up the exhaust the intake will
restrict the amount of air that will flow through the carb which keeps it
close to 'stock' so the carb doesn't need changing. Same thing is true if
you only change the air filter, the exhaust will restrict the maximum amount
of air that will flow. BUT if you change BOTH you will be going into a realm
that MamaYama did not allow for in the original carb/jetting setup.
Doing both will give you more available power because the engine doesn't
have to work so hard to suck in air or push it out---leaving more available
horsepower at the rear wheel BUT the increased airflow will be outside the
parameters of the way the engine was set up to begin with which will make it
run lean with all the other problems that go with THAT!
A friend ported his V-Star 1100 engine and intake, put on V&H longshots and
a hypercharger, all at the same time without re-jetting. the bike was
impossible to start, ran like crap when it did and 'blued' his pipes in less
than 300 miles. BUT when he got the jetting done it started better than it
did when new, ran like a striped ass ape AND got better fuel mileage than
stock.
I'd say it is worth the effort.
You can do it yourself, check out <a style='text-decoration: underline;' href="http://www.delphiforums.com" target="_blank">www.delphiforums.com</a> there are forums for
Roadstars and V-stars with very knowledgeable people willing to teach ya
how.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Carb rejetting 

Khutter wrote:
 > "bob" <robob68.RemoveThis@earthlink.net> wrote in message
 > news:1117117932.718901.139670@o13g2000cwo.googlegroups.com...
  > > Just how important is it, really, to rejet the carbs when installing
  > > slipons?
  > >
  > > I have spoken to several people with VSTARS (mine's a 650) who've
  > > installed pipes and not rejetted. The only thing they report is some
  > > backfiring...which I already have on my 2002 with stock pipes.
  > >
  > > I'm thinking about trying it along with K & N's new (to me at least)
  > > high flow replacement filter element.....about 50 Bucks vice the $150
  > > it costs to replace the whole assy.
  > >
  > > The dealer tells me (and why do I grab hold of my wallet whenever he
  > > speaks???) that the bike would not idle and be hard to start.........
  > >
  > > cheers
  > >
  > > bob
  > >
 >
 > It is fairly simple---if you are just opening up the exhaust the intake will
 > restrict the amount of air that will flow through the carb which keeps it
 > close to 'stock' so the carb doesn't need changing. Same thing is true if
 > you only change the air filter, the exhaust will restrict the maximum amount
 > of air that will flow. BUT if you change BOTH you will be going into a realm
 > that MamaYama did not allow for in the original carb/jetting setup.
 > Doing both will give you more available power because the engine doesn't
 > have to work so hard to suck in air or push it out---leaving more available
 > horsepower at the rear wheel BUT the increased airflow will be outside the
 > parameters of the way the engine was set up to begin with which will make it
 > run lean with all the other problems that go with THAT!
 > A friend ported his V-Star 1100 engine and intake, put on V&H longshots and
 > a hypercharger, all at the same time without re-jetting. the bike was
 > impossible to start, ran like crap when it did and 'blued' his pipes in less
 > than 300 miles. BUT when he got the jetting done it started better than it
 > did when new, ran like a striped ass ape AND got better fuel mileage than
 > stock.
 > I'd say it is worth the effort.
 > You can do it yourself, check out <a style='text-decoration: underline;' href="http://www.delphiforums.com" target="_blank">www.delphiforums.com</a> there are forums for
 > Roadstars and V-stars with very knowledgeable people willing to teach ya
 > how.

OK, tnx. That was what I needed to know. Guess I'll rejet.

cheers

bob<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Carb rejetting