Forum Donations
Search
VTF Google Search
 Click Here

Float level adjusting - simplified

Virago Help Tech and user submitted articles.
  • Advertisement

Topic locked

PostAuthor: RusVirago » Mon Feb 02, 2009 11:17 am

Vyrus";p="130503 wrote:Rus, how did you bench test? with a gravity feed of fuel to simulate the petcock being on prime?


Yes exactly just get the carbs as level as you can and make sure that the floats and needle stop the fuel without it over filling. ALso I pulled the bowls off a couple time to see the amount of fuel in them. Make sure when you install them, install them full of fuel! so the needle wont get stuck and not stop fuel!
Image
1985 Virago XV700-My bike
1986 virago Xv1100- Brother's bike
1988 Gold edition virago XV1100 MINT- Dad's bike


Also own
2002Suzuki GSX-R750
1984 Kawasaki GPZ550
1992 mitsubishi 3000gt VR-4- two of them
1993 Mitsubishi 3000gt SL
1998 Wrangler 4.0L
User avatar
RusVirago
Senior Membership
Senior Membership
 
Posts: 385
Joined: Tue Dec 02, 2008 5:44 pm
Location: M.A Flag

PostAuthor: Vyrus » Mon Feb 16, 2009 10:40 am

so what is it that would cause the carbs to overflow when the height is set correctly.... the needle getting stuck.. etc???

Vyrus
Senior Membership
Senior Membership
 
Posts: 312
Images: 38
Joined: Tue Aug 07, 2007 8:05 pm
Location: Tucson, AZ Flag

PostAuthor: grazingazer » Mon Feb 16, 2009 10:45 am

loose needle seat...dirt under needle...worn or incorrect needle...needle seat installed without a washer...
if you're asking for help please include the year and model of the bike in your signature
then turn your signature on

my bike is a modified 1981 virago xv75012927the rockabilly rat
User avatar
grazingazer
Mod
Mod
 
Posts: 16725
Images: 19
Joined: Sun Jan 07, 2007 1:07 pm
Location: georgia Flag
Bike year & model: modified 1981 xv750 virago...1975 650 xsb
Sex: Male

Re: Float level adjusting - simplified

PostAuthor: toohightodie » Mon Mar 02, 2009 3:25 pm

Here's from the Clymer, for anyone who doesn't have it


10. Adjust the float tang on the affected carburetor(s). Adjust by carefully bending the tang on the float arm. Bend the float tang upward very slightly to lower the fuel level; bend the float tang downward to raise the fuel level. If the float level is set too high, the result will be a rich air-fuel mixture. If it is set too low the mixture will be too lean.

Fuel level specs (TABLE 2)
1981-1983
NO 1. CARB (left) 1.0mm +- 1.0mm
NO 2. CARB (right) 2.0mm +- 1.0mm

1984-1987 0mm +- 1.0mm
1988-on 1.5mm-2.5mm

toohightodie
Junior Membership
Junior Membership
 
Posts: 68
Images: 1
Joined: Wed Mar 12, 2008 8:05 pm
Location: Central New Mexico Flag

Re: Float level adjusting - simplified

PostAuthor: Delmeister » Wed Mar 11, 2009 10:06 pm

So for my bike it should be 2.0 +/- 0.5 mm above the line right?

Haven't taken my carbs apart so am having troubles with some pictures and descriptions referring to jet bosses etc. With carbs turned upside down, and taking the flat surface as reference, how far to the top(bottom) of the floats for my bike?
1998 XV1100
Image

Delmeister
Senior Membership
Senior Membership
 
Posts: 132
Images: 2
Joined: Sat Dec 20, 2008 1:19 pm
Location: Eastern Ontario Flag
Bike year & model: 1998 xv1100 Virago
Sex: Male

Re: Float level adjusting - simplified

PostAuthor: toohightodie » Wed Mar 11, 2009 10:44 pm

this jap sh!t can be a sure pain in the nuts sometimes.
The translation again is --> 19MM from the top of the (xv1100=="orange") floats to the top of the pilot jet. Both of my carbs were set at this height but the front one needed an adjustment down.

The fuel line measurement is taken from the float bowl parting line. It doesn't necessarily HAVE to be 2.0mm +/- .5 mm but I think that should work.

Don't be scared to take your carbs off, just sit down and do it. The removal of everything inside it is pretty basic.
What kind of forks are on your Virago? Do you have a bigger picture? Did you rake your neck?

toohightodie
Junior Membership
Junior Membership
 
Posts: 68
Images: 1
Joined: Wed Mar 12, 2008 8:05 pm
Location: Central New Mexico Flag

Re: Float level adjusting - simplified

PostAuthor: Delmeister » Wed Mar 11, 2009 10:57 pm

What do you mean it does not necessarily have to be, after all the fuss that's been made about the accuracy required.

I just got the bike so I can't really answer you question about the origin of the forks or the rake. I'll let you know later when I find out. Here's a larger picture if that helps.
You do not have the required permissions to view the files attached to this post.

Delmeister
Senior Membership
Senior Membership
 
Posts: 132
Images: 2
Joined: Sat Dec 20, 2008 1:19 pm
Location: Eastern Ontario Flag
Bike year & model: 1998 xv1100 Virago
Sex: Male

Re: Float level adjusting - simplified

PostAuthor: toohightodie » Wed Mar 11, 2009 11:42 pm

All I'm saying is that tolerance is optimal but not necessary for riding.

Your bike will probably run, albeit :banned: :rules: .. it'll still putt at settings outside of that range.
Last edited by Jake on Mon Sep 04, 2017 4:12 pm, edited 1 time in total.
Reason: Vulgarity removed. http://viragotechforum.com/viewtopic.php?f=208&t=29942&sid=1b80e037920acc49fb879fa2d1496874

toohightodie
Junior Membership
Junior Membership
 
Posts: 68
Images: 1
Joined: Wed Mar 12, 2008 8:05 pm
Location: Central New Mexico Flag

Re: Float level adjusting - simplified

PostAuthor: scootermcq » Thu Mar 12, 2009 4:12 am

I'd say it is fairly important to set them close to spec.

One time I was set a little too low and thought, "what the heck, I am not starving it for fuel" and ran it like that.

One day I was waiting to make a left out of a store onto a busy provincial highway and ended up honking on the throttle to get out and up to speed quickly.

Well, that pretty much drained the fuel in the bowl with it being lower, and with the bike leaning as well to make the corner I ending up hanging my float as the bowl refilled. Flooded that carb, fouled the plugs and lost that jug.

There I am pulled over in a cemetery with a "dead" jug (how appropriate) changing plugs, draining carb bowls and trying to get the float to quit hanging.

Moral of the story, they have specifications for a reason...
Image
2000 Suzuki VS1400 Intruder
Jardine Pipes
Mustang Seat
Crash Bar & Highway Pegs
Lightbar
User avatar
scootermcq
Mod
Mod
 
Posts: 1846
Images: 17
Joined: Sun May 11, 2008 9:39 am
Location: Oshawa, Ontario Flag
Bike year & model: 2000 Suzuki Intruder
VS1400
Sex: Male

Re: Float level adjusting - simplified

PostAuthor: Delmeister » Fri Mar 13, 2009 10:53 am

The Clymer manual does not say weather the level should be above or below the line, but it seems everyone is assuming above. However the 1987 supplement to the Yamaha service manual says the level should be 1.5-2.5 mm below the line.

Furthermore, the 1983 manual makes no distinction between the carburetors. It states the level should be 0.0 +- 1.0 mm above the line (make sense of that).

Can anyone clarify this?
1998 XV1100
Image

Delmeister
Senior Membership
Senior Membership
 
Posts: 132
Images: 2
Joined: Sat Dec 20, 2008 1:19 pm
Location: Eastern Ontario Flag
Bike year & model: 1998 xv1100 Virago
Sex: Male

Re: Float level adjusting - simplified

PostAuthor: scootermcq » Fri Mar 13, 2009 11:26 am

Could it be Mikuni vs Hitachi carbs? In 1983 they had no way of knowing they would be using mikuni down the road
Image
2000 Suzuki VS1400 Intruder
Jardine Pipes
Mustang Seat
Crash Bar & Highway Pegs
Lightbar
User avatar
scootermcq
Mod
Mod
 
Posts: 1846
Images: 17
Joined: Sun May 11, 2008 9:39 am
Location: Oshawa, Ontario Flag
Bike year & model: 2000 Suzuki Intruder
VS1400
Sex: Male

PostAuthor: grazingazer » Fri Mar 13, 2009 11:31 am

i would recommend trusting the yamaha factory manual over clymer's on float measurements for your bike
if you're asking for help please include the year and model of the bike in your signature
then turn your signature on

my bike is a modified 1981 virago xv75012927the rockabilly rat
User avatar
grazingazer
Mod
Mod
 
Posts: 16725
Images: 19
Joined: Sun Jan 07, 2007 1:07 pm
Location: georgia Flag
Bike year & model: modified 1981 xv750 virago...1975 650 xsb
Sex: Male

Re: Float level adjusting - simplified

PostAuthor: Scotty_357 » Tue Mar 17, 2009 1:14 am

greetings from fort Worth Tx.I have a 1985 XV1000 with after market pipes.Has 30k miles. I just got done overhauling hatich carbs on my XV1000. It was not by choice mind you, the reason for the overhaul was due pilot screw on the right side completely fallen out.- while driving down the interstate) I'd had backed it out attempting to reduce the backfireing problem some months earlier, only to find out that elimiting air induction system would only solve the backfiring. Any way...I bought carb rebuild kits and installed them. Ive done more carb and injection systems over last 20 years than I to think about.. I'am also lics. Airframe&PowerPlant Tech......But these damn things drove me nuts!!
After on going ordeal of about oh say 2 days, did I find this web sight.
Obviuosly I dont know everything about motorcycles and found a lot of info helpful. I sycro the baffle plates on the bench, by dropping both idle screw completly out. Then screwed in the center sych screw taking up all free play between at cable connection side of carb. This did the trick as far as sycroing the carbrs. I had fuel coming up through the fuel nozzle
on the right carb...I assume my foat level is to high. I reduced a lot of it by turning pilot screw in. I did check the level with the clear tube process
and it seems a little high (motor not running) Flaot level was set by level
the floats by level with air horn base. Done with the carb upside down gravity pressure only. Here's the deal... I tried going by spec's along with twin vacume gauges all that. Dont get me wrong,this stuff was design a certin way for a certin reason. I did it thier way and it seem to make things worse. Any comeback this subject would welcome. I love my Virago, I got her running half desent now.

Scotty_357
Junior Membership
Junior Membership
 
Posts: 8
Joined: Sun Mar 15, 2009 12:02 am
Location: Fort Worth ,Texas Flag

Re: Float level adjusting - simplified

PostAuthor: scootermcq » Tue Mar 17, 2009 6:07 am

Setting them to spec is great if everything is yamaha / hitachi. Problem is aftermarket floats needles and seats may not be the exact same size. So while 15mm may work for one guy, another may have to be 17 or 13 mm to get the fuel level right when you do the clear tube test. No matter what the measurements are, you want the fuel at the seam where the bowl meets the body.

Adjusting pilot screw will not change float levels. It only adjusts the amount of fuel coming out of the idle jet. You need to bend the tang on the floats to change the level of fuel in the bowls. If the floats are wrong, you will flood that cylinder (or starve it under exceleration). The pilot screws are about right at 2.5 turns out from soft seat and then you can tweak from there by plug reading etc.
Image
2000 Suzuki VS1400 Intruder
Jardine Pipes
Mustang Seat
Crash Bar & Highway Pegs
Lightbar
User avatar
scootermcq
Mod
Mod
 
Posts: 1846
Images: 17
Joined: Sun May 11, 2008 9:39 am
Location: Oshawa, Ontario Flag
Bike year & model: 2000 Suzuki Intruder
VS1400
Sex: Male

Re: Float level adjusting - simplified

PostAuthor: aball755 » Tue Mar 17, 2009 5:19 pm

question sounds supid but here it go's. pushing tab down meens more fule and pulling tab up meens less?

aball755
Junior Membership
Junior Membership
 
Posts: 89
Images: 5
Joined: Thu Apr 10, 2008 2:58 pm
Location: chilhowie Va Flag

Re: Float level adjusting - simplified

PostAuthor: scootermcq » Wed Mar 18, 2009 5:56 am

Not a stupid question... I had to look at my own picture for a second to think about the answer myself.

Remember you are working upside down...

When you push the tang down, you are lowering the floats.... less fuel

When you pull the tang up, you are raising the floats... more fuel.
You do not have the required permissions to view the files attached to this post.
Image
2000 Suzuki VS1400 Intruder
Jardine Pipes
Mustang Seat
Crash Bar & Highway Pegs
Lightbar
User avatar
scootermcq
Mod
Mod
 
Posts: 1846
Images: 17
Joined: Sun May 11, 2008 9:39 am
Location: Oshawa, Ontario Flag
Bike year & model: 2000 Suzuki Intruder
VS1400
Sex: Male

Re: Float level adjusting - simplified

PostAuthor: scootermcq » Wed Mar 18, 2009 1:06 pm

scootermcq";p="137041 wrote: When you push the tank down, you are lowering the floats.... less fuel


I mean't tang not tank.... saw the typo, but could not edit my own post.
Image
2000 Suzuki VS1400 Intruder
Jardine Pipes
Mustang Seat
Crash Bar & Highway Pegs
Lightbar
User avatar
scootermcq
Mod
Mod
 
Posts: 1846
Images: 17
Joined: Sun May 11, 2008 9:39 am
Location: Oshawa, Ontario Flag
Bike year & model: 2000 Suzuki Intruder
VS1400
Sex: Male

PostAuthor: grazingazer » Wed Mar 18, 2009 3:26 pm

if you click edit at the top right of your post you should be able to edit it...i do it all of the time
if you're asking for help please include the year and model of the bike in your signature
then turn your signature on

my bike is a modified 1981 virago xv75012927the rockabilly rat
User avatar
grazingazer
Mod
Mod
 
Posts: 16725
Images: 19
Joined: Sun Jan 07, 2007 1:07 pm
Location: georgia Flag
Bike year & model: modified 1981 xv750 virago...1975 650 xsb
Sex: Male

Re: Float level adjusting - simplified

PostAuthor: scootermcq » Wed Mar 18, 2009 4:19 pm

Yeah GG... it's kinda wierd. In any other thread, I can edit. For some reason on this thread the only button there is the quote button. Can't figure that one out.
Image
2000 Suzuki VS1400 Intruder
Jardine Pipes
Mustang Seat
Crash Bar & Highway Pegs
Lightbar
User avatar
scootermcq
Mod
Mod
 
Posts: 1846
Images: 17
Joined: Sun May 11, 2008 9:39 am
Location: Oshawa, Ontario Flag
Bike year & model: 2000 Suzuki Intruder
VS1400
Sex: Male

PostAuthor: grazingazer » Wed Mar 18, 2009 4:42 pm

next time you errr i'll try to edit it for ya skooter
if you're asking for help please include the year and model of the bike in your signature
then turn your signature on

my bike is a modified 1981 virago xv75012927the rockabilly rat
User avatar
grazingazer
Mod
Mod
 
Posts: 16725
Images: 19
Joined: Sun Jan 07, 2007 1:07 pm
Location: georgia Flag
Bike year & model: modified 1981 xv750 virago...1975 650 xsb
Sex: Male


PreviousNext

Topic locked


  • Advertisement

Return to Virago Help - Tech Articles

Who is online

Registered users: Baidu [Spider], fricks, Google [Bot], jonno51, Majestic-12 [Bot], RupertC, Steve_White88