Forum Donations
Search
VTF Google Search
 Click Here

Float level adjusting - simplified

Virago Help Tech and user submitted articles.
  • Advertisement

Topic locked

Float level adjusting - simplified

PostAuthor: lassesand » Thu Jun 23, 2005 2:45 am

When adjusting the float levels in the carbs it's quite frustrating to pull the carbs and put them on a number of times. I measured the distance from the floats underside to the main (& pilot) jets with a ruler. When it was too low I read about 16 mm. Added 2-3 mm to rise the level. Got the #1 carb spot on in the first attemt! #2 was done in 4 more "pulls"...
Perhaps this can be of any help - at least to know where to start adjusting an how much.
You do not have the required permissions to view the files attached to this post.
Lasse S
User avatar
lassesand
Mod
Mod
 
Posts: 864
Images: 16
Joined: Mon Feb 09, 2004 3:36 am
Location: Sweden Flag
Bike year & model: 1981 TR1., 1982 TR1., 1982 TR1. 1982 XZ550, 1984 XVZ1200, 1987 TT600, 1984 VF1000F
Sex: Male

PostAuthor: raptorredhawk » Mon Aug 22, 2005 8:22 pm

Thanks for that bit of expertise. What carbs are those? I have Hitachi HSC40 on an 85 700. Are your measurements still going to work for me? It would be a big help to have that "starting point". JL
Always thankful for another day! JL - on my '85 XV700
User avatar
raptorredhawk
Junior Membership
Junior Membership
 
Posts: 58
Images: 4
Joined: Fri Jul 08, 2005 6:14 pm
Location: Cincinnati, OH Flag

PostAuthor: Matthew » Tue Aug 23, 2005 10:40 pm

81-85 / 86ish used the same carbs.
thoes are hsc-40 in the pics.
User avatar
Matthew
Silver Membership
Silver Membership
 
Posts: 12877
Images: 15
Joined: Thu Apr 03, 2003 4:55 pm
Location: Toledo, Ohio Flag

Re: Float level adjusting - simplified

PostAuthor: Savager » Tue Oct 18, 2005 3:29 pm

To anyone who has ever done this: Might I assume this measurement is taken with the floats pushed down as far as possible (as oriented in the picture), fully closing the float valve? Thanks.
User avatar
Savager
Junior Membership
Junior Membership
 
Posts: 97
Images: 3
Joined: Tue Oct 18, 2005 12:47 pm
Location: Savage, MN Flag

Re: Float level adjusting - simplified

PostAuthor: cerm78 » Wed Oct 19, 2005 5:41 pm

I'm adjusting my carbfloats by this procedure... I think that the setting is read with the floats just resting into the needle springs and I'll confirm that in a couple of days...

I think that, because my hardest air push trough the carb feed tubes is stopped just by flicking the carbs upside down...

I'll inform when confirmed!

Regards...
Yamaha XV1000'84 "Mili"
Suzuki GS450L'81 "Zuki"
User avatar
cerm78
Junior Membership
Junior Membership
 
Posts: 65
Images: 6
Joined: Fri Aug 12, 2005 12:27 pm
Location: Costa Rica Flag

Re: Float level adjusting - simplified

PostAuthor: Savager » Thu Oct 20, 2005 7:09 am

Cerm78 - Yes, please keep us informed. I adjusted mine to that spec with the float pushed all the way down, not just resting on the float spring. I got the carbs installed last night, and it fired up. Only running on one cylinder however, the other just blowing gas out the exhaust. I didn't have time to check float heights with the tubing yet. Maybe tonight. I'll keep you informed here...
Thanks!
User avatar
Savager
Junior Membership
Junior Membership
 
Posts: 97
Images: 3
Joined: Tue Oct 18, 2005 12:47 pm
Location: Savage, MN Flag

Re: Float level adjusting - simplified

PostAuthor: cerm78 » Fri Oct 21, 2005 5:08 pm

I measured the actual fuel level in my workbench and it was exaclty at the 0mm mark (actually, 1/10th of a mm over it)... So I think that the correct way to adjust the floats is with them just resting over the shutoff needle valve.

Now I have to mount them in the bike and test them in reallity!

Regards!
Yamaha XV1000'84 "Mili"
Suzuki GS450L'81 "Zuki"
User avatar
cerm78
Junior Membership
Junior Membership
 
Posts: 65
Images: 6
Joined: Fri Aug 12, 2005 12:27 pm
Location: Costa Rica Flag

PostAuthor: Backroads » Thu May 11, 2006 5:46 pm

Never put pressure on the floats to close the valve. You can and most liely will damage the valve seat or needle if you do. Measurements are taken with the weight of the float only. This applies to just about all carbs as far as I know.
User avatar
Backroads
Silver Membership
Silver Membership
 
Posts: 1041
Images: 4
Joined: Thu Aug 04, 2005 4:20 pm
Location: Baltimore, Maryland Flag

Re: Float level adjusting - simplified

PostAuthor: lassesand » Fri May 12, 2006 12:06 pm

No pressure, just gravity!
Good to hear that it worked for you cerm 78! :beer:
Lasse S
User avatar
lassesand
Mod
Mod
 
Posts: 864
Images: 16
Joined: Mon Feb 09, 2004 3:36 am
Location: Sweden Flag
Bike year & model: 1981 TR1., 1982 TR1., 1982 TR1. 1982 XZ550, 1984 XVZ1200, 1987 TT600, 1984 VF1000F
Sex: Male

Re: Float level adjusting - simplified

PostAuthor: pachakutek » Fri Nov 10, 2006 4:50 am

can somebody explain me the first picture (carb#1)? I don't get what's being mesured there, also what's the tubing for?... the other pic is clear enough.
EDIT: I found the page on clymer (130), where it explains the procedure... now it make sense the 19mm... It must be a pain if they are far off, since bending the tang is very subjective...
User avatar
pachakutek
Mod
Mod
 
Posts: 776
Images: 33
Joined: Sun Aug 06, 2006 11:37 pm
Location: San Mateo, CA Flag

Re: Float level adjusting - simplified

PostAuthor: lassesand » Fri Nov 10, 2006 5:12 am

The tube is attached to the bottom of the carb and is showing the fuel level. It should be 1 mm above the floatbowl-joint. I had the level much to low ( 2-3 mm under) resulting in the engine stoppin if braking hard etc.
Lasse S
User avatar
lassesand
Mod
Mod
 
Posts: 864
Images: 16
Joined: Mon Feb 09, 2004 3:36 am
Location: Sweden Flag
Bike year & model: 1981 TR1., 1982 TR1., 1982 TR1. 1982 XZ550, 1984 XVZ1200, 1987 TT600, 1984 VF1000F
Sex: Male

PostAuthor: pachakutek » Fri Nov 10, 2006 5:18 am

clymer says to measure the level of fuel on the line, and that it should be 1mm (left) and 2mm(rigth) from the bowl partline.. but it's not clear if the fuel level line should be above this partline or below?...
1982 XV920J
1995 XV750GC
1984 XV1000(RIP)
1985 XV700 Soon to be parted, stay tuned
User avatar
pachakutek
Mod
Mod
 
Posts: 776
Images: 33
Joined: Sun Aug 06, 2006 11:37 pm
Location: San Mateo, CA Flag

Re: Float level adjusting - simplified

PostAuthor: lassesand » Fri Nov 10, 2006 5:24 am

It's above. I've read it in the OEM manuals.
Lasse S
User avatar
lassesand
Mod
Mod
 
Posts: 864
Images: 16
Joined: Mon Feb 09, 2004 3:36 am
Location: Sweden Flag
Bike year & model: 1981 TR1., 1982 TR1., 1982 TR1. 1982 XZ550, 1984 XVZ1200, 1987 TT600, 1984 VF1000F
Sex: Male

PostAuthor: pachakutek » Fri Nov 10, 2006 5:31 am

Thanks... that was fast... this thread should be sticky.
1982 XV920J
1995 XV750GC
1984 XV1000(RIP)
1985 XV700 Soon to be parted, stay tuned
User avatar
pachakutek
Mod
Mod
 
Posts: 776
Images: 33
Joined: Sun Aug 06, 2006 11:37 pm
Location: San Mateo, CA Flag

Re: Float level adjusting - simplified

PostAuthor: lassesand » Fri Nov 10, 2006 5:57 am

OK. Here in Sweden the clock is 12 (noon), isn't it in the middel of the night in Canada??
Lasse S
User avatar
lassesand
Mod
Mod
 
Posts: 864
Images: 16
Joined: Mon Feb 09, 2004 3:36 am
Location: Sweden Flag
Bike year & model: 1981 TR1., 1982 TR1., 1982 TR1. 1982 XZ550, 1984 XVZ1200, 1987 TT600, 1984 VF1000F
Sex: Male

Re: Float level adjusting - simplified

PostAuthor: pachakutek » Fri Nov 10, 2006 1:02 pm

Yes.. it was about 2:30am (PT)when I went to bed :roll: I got carried away with the carbs info .... I'm in California-USA and the flag on my profile is Peruvian though... :grin: They look similar, but Peru's has the national shield in the middle instead of the Maple Leaf.
Image

Thanks again for the great info, I'll let you know how it goes.
User avatar
pachakutek
Mod
Mod
 
Posts: 776
Images: 33
Joined: Sun Aug 06, 2006 11:37 pm
Location: San Mateo, CA Flag

Re: Float level adjusting - simplified

PostAuthor: MDawdy » Fri Dec 29, 2006 9:43 pm

lassesand";p="10119 wrote: ... I measured the distance from the floats underside to the main (& pilot) jets with a ruler ...


Precisely, did you measure to the top of the main jet, or to the top of the main jet boss [the tall thing that the m jet is screwed into]? In the pic it looks like you measured to the boss. Thanx.

Mick
User avatar
MDawdy
Junior Membership
Junior Membership
 
Posts: 24
Images: 8
Joined: Fri Dec 29, 2006 9:35 pm
Location: London, ON Flag

PostAuthor: steven s. wardlaw » Sun Dec 31, 2006 10:14 am

hello! just wanted to tell my side of the carb story.my 82 920 had all kinds of carb trouble when purchased. after buying a couple of manuals and carb kits i went to work. i have rebuilt hundreds auto carbs(quadrojets). these virago carbs are as touchy as any of them. i set my carbs float height measured off the gasket surface. i used the 19mm height i read off another web sight. one carb was spot on the other had to be moved slightly. to make adjustments easy i replaced the float bowl screws with allen head screws and use a ball ended allen wrench to remove screws. you want have to remove crbs to make fine adjustments. i also cut off an allen wrench to make a short reach for a couple of the screws. you can now do all your adjusting without removing carbs. happy new year!

steven s. wardlaw
Junior Membership
Junior Membership
 
Posts: 41
Joined: Sat Dec 23, 2006 10:12 am
Location: greenville s.c. Flag

Re: Float level adjusting - simplified

PostAuthor: guest » Thu Apr 26, 2007 12:28 pm

Here try this
You do not have the required permissions to view the files attached to this post.

guest
Junior Membership
Junior Membership
 
Posts: 5
Joined: Thu Apr 26, 2007 12:09 pm
  Flag

Re: Float level adjusting - simplified

PostAuthor: lassesand » Thu Apr 26, 2007 1:49 pm

MDawdy";p="48549 wrote:
lassesand";p="10119 wrote: ... I measured the distance from the floats underside to the main (& pilot) jets with a ruler ...


Precisely, did you measure to the top of the main jet, or to the top of the main jet boss [the tall thing that the m jet is screwed into]? In the pic it looks like you measured to the boss. Thanx.

Mick


The main jet boss. X-scuse for a late answer.
I'll probably tear down my carbs this weekend. Seems like there is something blocking one of the pilot jets from time to time. Today was a lovely day (summer 20 deg Celcius and sunny) for being in the end of April (in Sweden). Had a very nice trip driving my TR1. home from work! :grin:
Lasse S
User avatar
lassesand
Mod
Mod
 
Posts: 864
Images: 16
Joined: Mon Feb 09, 2004 3:36 am
Location: Sweden Flag
Bike year & model: 1981 TR1., 1982 TR1., 1982 TR1. 1982 XZ550, 1984 XVZ1200, 1987 TT600, 1984 VF1000F
Sex: Male


Next

Topic locked


  • Advertisement

Return to Virago Help - Tech Articles

Who is online

Registered users: Baidu [Spider], bstig60, drainplug, Google [Bot], Hellgate, oikopedo, sbrbot