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Carburetor heaters

PostAuthor: sbrbot » Sat Mar 10, 2018 4:40 pm

Are that carb heaters (connected with these wires to carbs):

on this picture

Image

or on this video

www.youtube.com Video from : www.youtube.com


I cannot find them on carb diagrams on sites like Partzilla.

Since when Yamaha Viragos have carbs with heaters?
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Re: Carburetor heaters

PostAuthor: XV535 » Mon Mar 12, 2018 2:43 pm

I think since 1994 when they changed to loom to accommodate a single Crank Sensor Coil and a different Igniter Unit. I know that a 1990 UK spec bike does not have carb heaters whilst a 1994 UK spec bike does. I do not think there were any loom changes in between these dates. I have used the 1990 bike in harsh UK winter conditions and never had carb icing. The biggest problem is driving winter rain on the coils, which a can of WD40 keeps at bay.

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Re: Carburetor heaters

PostAuthor: sbrbot » Tue Mar 13, 2018 9:04 am

XV535 wrote:I think since 1994 when they changed to loom to accommodate a single Crank Sensor Coil and a different Igniter Unit.


You mean about pickup coils and corresponding TCIs - when they changed from two pickup coils (one per each cylinder) to only one pickup coil and then changed TCI to accommodate this. I think this happend in 1991. However, what does it have to do with carb heaters!?

Two pickup coil assembly - 2GV-81670-20-00 and corresponding TCI 2GV-82305-20-00 (from 1987-1990 for Virago xv500/xv535)
One pickup coil assembly - 3BT-81670-00-00 and corresponding TCI 3BT-82305-00-00 (from 1991-2001 for Virago xv400/xv500/xv535)
One pickup coil assembly - 4TR-81670-00-00 and corresponding TCI 3BT-82305-00-00 (from 1997-2003 for Dragstar xvs400/xvs650)

XV535 wrote:I know that a 1990 UK spec bike does not have carb heaters whilst a 1994 UK spec bike does. I do not think there were any loom changes in between these dates. I have used the 1990 bike in harsh UK winter conditions and never had carb icing. The biggest problem is driving winter rain on the coils, which a can of WD40 keeps at bay.


What you mean by "carb icing"? Fuel will never freeze but one can have a lot of trouble trying to start engine on low temps although everything is fine with bike's electricity and mechanics.
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Re: Carburetor heaters

PostAuthor: Flyingdog » Tue Mar 13, 2018 10:04 am

Without going on monologuing, it's mainly an aviation thing. But some motorcycle(s) have been know to get some frozen moisture droplets in their carbs. Usually from the venturi getting blocked. So the combination of the rushing fuel and lack of warm air, will freeze these droplets. Very rare, here in the states, but over there..yea. Remember..their toilets flush counterclockwise, so anything is possible.
Last edited by Flyingdog on Tue Mar 13, 2018 10:31 am, edited 1 time in total.
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Re: Carburetor heaters

PostAuthor: Bern » Tue Mar 13, 2018 10:08 am

What Flyingdog said ^^^

sbrbot wrote:
What you mean by "carb icing"? Fuel will never freeze but one can have a lot of trouble trying to start engine on low temps although everything is fine with bike's electricity and mechanics.


Not the fuel but the carb' body freezes due to rapid flow of cold air, bit of an explanation here >>>>>> https://en.wikipedia.org/wiki/Carburetor_icing

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Re: Carburetor heaters

PostAuthor: Bern » Tue Mar 13, 2018 10:15 am

Flyingdog wrote: So the combination of the rushing fuel and lack of warm air, will freeze these droplets.


Yep, I got it in my hill climb car once, twin barrel downdraught carb's on heated maniflod but with a 'free breathing' wire mesh air filter, foot firmly planted & 2/3rds up the hill it petered out, opened the bonnet/hood & the carb body was white, had to sit & wait for radiated heat to thaw it before it would restart.

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Re: Carburetor heaters

PostAuthor: sbrbot » Wed Mar 14, 2018 12:08 pm

Hm, the problem is that I cannot find this xv535's carburetor with heaters on any diagram!?
What is part number of it and how these heaters are controlled?
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Re: Carburetor heaters

PostAuthor: Flyingdog » Wed Mar 14, 2018 12:42 pm

You read German?

https://www.neubert-racing.com/search/r ... U-83790-20

http://viragotechforum.com/viewtopic.php?f=5&t=43896

I THINK that is for the screw-in type. I've just never paid any mind to that stuff. Just give'n ya an avenue that might help. Not entirely sure if I'm looking at your pic correctly. Take 'one' carb..is the heater the left or right connector? Kinda looks like it's on the right. Maybe someone more familiar with that yr. carb could help.

Edit: :error: Oh duh..was doing something on the bike..then it just dawned on me..those connectors on the left are grounds. Carbs are rubber mounted, so they need grounding somehow....oh duh/again. :doh: Told ya I don't mess with heaters. :bg:
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Re: Carburetor heaters

PostAuthor: sbrbot » Wed Mar 14, 2018 5:29 pm

Thanks Flyingdog, that helps. This is Heater Assy (30W).

I found part numbers: 3BT-83790-00-00 (seems for Virago xv535 models from 1995) and later heater model 5FU-83790-20-00 for non xv535 model but newer bikes like xvs650.

Left wire (connector) on first picture could be ground (but what for, heater has ground through housing) and right red wire is positive connector from (probably) thermal switch (3BT-82560-00-00).
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Re: Carburetor heaters

PostAuthor: Flyingdog » Wed Mar 14, 2018 5:54 pm

Like I said in previous post..the left wire (on each carb) is the ground. The carb bodies can't be grounded as is, cuz of the rubber carb joints (air intake & A/F intake). That green/white corrosion is a good tip-off. Just like a car battery's ground. Usually the first to get that crap. Ground is always a separate ground wire to the firewall, cuz of the rubber motor/tranny/exhaust mounts.
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Re: Carburetor heaters

PostAuthor: sbrbot » Thu Mar 15, 2018 4:24 am

Flyingdog wrote:Like I said in previous post..the left wire (on each carb) is the ground. The carb bodies can't be grounded as is, cuz of the rubber carb joints (air intake & A/F intake). That green/white corrosion is a good tip-off. Just like a car battery's ground. Usually the first to get that crap. Ground is always a separate ground wire to the firewall, cuz of the rubber motor/tranny/exhaust mounts.


Yeah, sorry, you said it but I did not notice it. Carbs are isolated from the rest of motorcycle because its rubber mounts so it needs own grounding.

However, are these heaters on place of carb drain screws!? or they are next to them? One cannot see this from picture above.
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Re: Carburetor heaters

PostAuthor: Flyingdog » Thu Mar 15, 2018 10:17 am

sbrbot wrote:However, are these heaters on place of carb drain screws!? or they are next to them? One cannot see this from picture above.


I think (guess) they are those larger philips' head screws. Lower left, above the brace. Don't know...don't have to carbs infront of me.
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Re: Carburetor heaters

PostAuthor: Bern » Thu Mar 15, 2018 11:15 am

The angle of the photo is wrong for viewing the float chamber drain screws, look horizontally above the brace, about 40mm further in you will see the drain screws on the right side of each carb, it's a small brass crosshead screw (I guess about 5-6mm diameter)

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Re: Carburetor heaters

PostAuthor: sbrbot » Thu Mar 15, 2018 11:56 am

Flyingdog wrote:I think (guess) they are those larger philips' head screws. Lower left, above the brace. Don't know...don't have to carbs infront of me.
No, those phillips head screws left are not drain screws. Drain screws must be on right side.
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Re: Carburetor heaters

PostAuthor: Bern » Thu Mar 15, 2018 12:05 pm

Here you go bud .......

Image
Last edited by Bern on Thu Mar 15, 2018 12:23 pm, edited 1 time in total.

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Re: Carburetor heaters

PostAuthor: sbrbot » Thu Mar 15, 2018 12:21 pm

[quote="Bern"]Here you go bud .......

Yap, thanks, that's it!

20180315_162801_2.jpg
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Re: Carburetor heaters

PostAuthor: sbrbot » Thu Mar 15, 2018 12:23 pm

BTW, what is this phillips screw on left side!? (which we detected is not drain screw).
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Re: Carburetor heaters

PostAuthor: Flyingdog » Thu Mar 15, 2018 12:38 pm

Oops..thanks guys...I even answered that while back ago, with the correct location, to someone. Muffed this one. :doh: Don't know bout those other screws. The angle of them seems more than a set or fastener screw or somthing. Hey..got an idea..take it out, see what happens. :bg:
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Re: Carburetor heaters

PostAuthor: sbrbot » Thu Mar 15, 2018 5:10 pm

This is picture of my carburetor on xv500 (1992):

20180315_195809.jpg


Blue circles => drain screws
Yellow circles => idle screws
Green circles => some screws (?) here go carb heaters
Red circles => behind is something (what?), if one removes carb cap there's a hole and small O-ring behind (!?)

In place of screws (green) maybe one could put carb heaters afterwards?
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Re: Carburetor heaters

PostAuthor: Jaycyorkshire » Mon Jun 04, 2018 3:56 pm

Sorry to hijack this but I have a 91 H reg Uk 535 nothing has been connected to the carbs but I have two plugs near by that gave been joined which are black and yellow which say in the book they are carb heaters ??


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