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VM float height - 24mm?

  • Thread starter Thread starter Pendulum
  • Start date Start date
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Pendulum

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I've searched Google and the forums, as well as read over Nessisms guide and I've found varying answers about float height on my VM carbs from my 79 550. I'm leaning towards trusting Nessisms guide, which states 24mm for float height but my overflows were pouring gas very rapidly at that float height. Can anyone with a GS550 running VM carbs confirm this as the correct float height?
 
Pendulum said:
I've searched Google and the forums, as well as read over Nessisms guide and I've found varying answers about float height on my VM carbs from my 79 550. I'm leaning towards trusting Nessisms guide, which states 24mm for float height but my overflows were pouring gas very rapidly at that float height. Can anyone with a GS550 running VM carbs confirm this as the correct float height?
Click to expand...

I believe 24mm is correct, at least it is for larger models. I think it is plus or minus 1mm, so you shouldn't be spilling fuel. Probably a bit of crud causing float system to stick, or worn seats/needle valve? Ray
 
chuck hahn said:
http://members.dslextreme.com/users/bikecliff/
Click to expand...

That's about as helpful as this link. Like my OP says, I've Googled, searched here, and read the Nessism guide for the VM carbs.

Ghostgs1 said:
I believe 24mm is correct, at least it is for larger models. I think it is plus or minus 1mm, so you shouldn't be spilling fuel. Probably a bit of crud causing float system to stick, or worn seats/needle valve? Ray
Click to expand...

I foolishly used the needle from the rebuild kits, so I'll put the OEM ones back in. That was my next assumption once I verified the height. Also, I previously had the floats at 22mm and had overflow at that height so I'm really leaning towards the float valve needles. I assumed that it was the one part of the rebuild kits that "couldn't possibly be made wrong." I guess I was mistaken lol.

cowboyup3371 said:
Have you looked in the Suzuki service manual on Basscliff's site? It has that setting in there.
Click to expand...

I had previously looked through the manual, and was unable to find the info. I just went through it again and found it under the GS550L section, page 182. 24mm +/- 1mm it is! Thanks for the heads up.

Looks like I'll be swapping the needles tonight. How the hell did K&L mess them up? It's a spring inside a piece of metal!!! :confused:

Any other ideas, assuming I swap the needles and they still leak?
 
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You bet its usefull smartazz..your bike is like the 4th or 5th one down in the service manuals list...read the service manual and youll have your friggin answer!!!!!!
 
I just rebuilt the carbs on my '77 GS750. I used the clear plastic tube attached to the bowl drain to show the fuel level as I adjusted the levels.

In order to get a fuel level of 2.5-3mm below the bowl mating surface I had to set the floats at 26-27mm above the bowl surface with gasket in place.

Brian
 
chuck hahn said:
You bet its usefull smartazz..your bike is like the 4th or 5th one down in the service manuals list...read the service manual and youll have your friggin answer!!!!!!
Click to expand...


Considering the fact that I had mentioned, in my 1st post, that I'd already taken a look at the carb rebuild guide found on that site, one could reasonably assume that I was well aware of Cliffs site. Instead of giving an extremely vague and cryptic answer, you could have suggested that I try the service manual or you could have just not answered.

Also, if you had read the rest of my post where I responded to the other posts in this thread, you'll see that I had already looked through that manual. In fact, I've looked it over at least 10 times now. I found the info I needed by looking in the "L" portion of the manual, which I had previously skipped over because I don't have a GS550L. Based on the suggestion by cowboyup, I looked over the manual closer and found my answer.

I wasn't trying to p|ss in anyones Cheerios, but your response to my question seemed like a smartass response.

gssuzukixxx said:
I just rebuilt the carbs on my '77 GS750. I used the clear plastic tube attached to the bowl drain to show the fuel level as I adjusted the levels.

In order to get a fuel level of 2.5-3mm below the bowl mating surface I had to set the floats at 26-27mm above the bowl surface with gasket in place.

Brian
Click to expand...

Thanks. I'm assuming you used a fitting that threads into the bowl and has a barb for a hose on the other end?
 
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gssuzukixxx said:
I just rebuilt the carbs on my '77 GS750. I used the clear plastic tube attached to the bowl drain to show the fuel level as I adjusted the levels.

In order to get a fuel level of 2.5-3mm below the bowl mating surface I had to set the floats at 26-27mm above the bowl surface with gasket in place.

Brian
Click to expand...

The above statement may not be applicable because I am running float needles and seats from a rebuild kit...not stock Suzuki.

At any rate I highly recommend setting the actual fuel level using the clear tubing method rather than depending on float height setting.
 
gssuzukixxx said:
The above statement may not be applicable because I am running float needles and seats from a rebuild kit...not stock Suzuki.

At any rate I highly recommend setting the actual fuel level using the clear tubing method rather than depending on float height setting.
Click to expand...

I'm going to pick up some clear tubing tomorrow or maybe tonight. Thanks for the heads up. Your measurement of 26-27 seems about right, since the gasket is going to be 1-2mm thick.
 
The manual says to measure from the raised ridge on the carb body..WITHOUT A GASKET in place.
 
Hi,

If you don't want to read the manual, you'll find the number you need in this chart.

GS_carb_specs_v1.3.jpg



Thank you for your indulgence,

BassCliff
 
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Yanno, it's increasingly irritating to me when people who have obviously searched, perhaps not in the correct way or using the right terminology or what have you, but have obviously looked through the manual and made a reasonable effort to find the info they're looking for, and then turn to the board for help (I mean that's wtf this place is here for) and are met with smart assed answers or read the manual posts or the like by people who not too long ago posted the same damn questions and couldn't tell a float needle from a pilot jet.

It really sucks.
 
And it equally sucks when someone posts a link and are told its as useless as whatever else...try and help and its thrown back in the guys face.
 
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chuck hahn said:
The manual says to measure from the raised ridge on the carb body..WITHOUT A GASKET in place.
Click to expand...

I've been measuring without a gasket, but was measuring from the non-raised spot. Everything I read said "gasket mating surface." Thanks for clearing that up, I'll adjust accordingly in a few minutes.

BassCliff said:
Hi,

If you don't want to read the manual, you'll find the number you need in this chart.




Thank you for your indulgence,

BassCliff
Click to expand...

Thanks Cliff. It's not that I didn't want to read, it's just that I was looking in the wrong spot in the manual. I found it thanks to a suggestion on pg 1.

TheCafeKid said:
Yanno, it's increasingly irritating to me when people who have obviously searched, perhaps not in the correct way or using the right terminology or what have you, but have obviously looked through the manual and made a reasonable effort to find the info they're looking for, and then turn to the board for help (I mean that's wtf this place is here for) and are met with smart assed answers or read the manual posts or the like by people who not too long ago posted the same damn questions and couldn't tell a float needle from a pilot jet.

It really sucks.
Click to expand...

It is what it is. I'm grateful for the knowledge and help, and understand why people don't like spoon-feeding info. Hell, I don't even like spoon-feeding info. My only gripe is that sometimes it seems like people don't read anything but the 1st post, and assume that I haven't searched.

chuck hahn said:
And it equally sucks when someone posts a link and are told its as useless as whatever else...try and help and its thrown back in the guys face.
Click to expand...

I thought we cleared that up. Like I said in my other post: To me, you put off a smart ass vibe be posting a link to a site that I have obviously already looked to for info. If that wasn't your attention, then I apologize. The reason I compared Cliffs site to Google in terms of usefulness was because I'd already looked over both extensively, and was unable to find the info. Both sites are great tools and full of info. However, unless you know EXACTLY where to look, it can be very hard to find certain pieces of information. A 4 character piece of text, in a PDF that's hundreds of pages long and unsearchable, is kinda hard to find. If you want to discuss this further, please PM me.


BACK ON TOPIC:

I pulled all 4 bowls, and I guess I did use the stock/Mikuni needles because the needles are still in the carb kit baggies. It's been a few weeks since I rebuilt these so I was mistaken. The needles have a bit of surface rust that wasn't present before the initial tear down, and I just tested the floats in a pan of water. All 4 float perfectly. Something I did notice was that if I put one of needles from the rebuild kits in, the float sat at a way different angle. I'm at a loss for what could cause this, and I'm going to readjust float height by measuring from the raised rib on the carb body as Chuck suggested, and go from there.
 
Thanks! I'm going to reset the floats using the raised rib to measure form and try again. If they're still overflowing, I'm shipping them to chef. fml.
 
Hi,

Yes, just because I've answered the same question hundreds of times doesn't mean I should smart off to someone who has asked it for the first time. I'm sorry. :o

Here's a page on my little website that might have some helpful information.

Carb Specs:
Float Height/Jetting/Tuning



Thank you for your indulgence,


BassCliff​
 
Pen, check the new float needles against the old ones.
The VMcarbs and BScarbs used different length needles, and because of that your float levels will be incorrect if you swap them out and don't adjust, or if you mix and match. If somehow you've been sent the wrong ones (very likely, those kits aren't the best quality honestly..) or whatever, that could be part of if not all of your issue.
 
Me and you are fine..I was responding to Joshs poke in my ribs..I know what he was referring to..anyways, this is how you should measure..from that little raised rib inside the carb body to the tops of the floats..

 
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