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Re:Checking Float Level
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TOPIC: Re:Checking Float Level
#726873
RRSRoadstar1700 (User)
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Checking Float Level 4 Years, 1 Month ago  
Since I had my carb off for jetting (see Jetting By Dyno) I decided to check my float level. I decide to do this mainly because I saw signs that the bike may have been running to rich. This bike was bought in Sept 2013 with 10.5k miles. The bike ran fine as bought, but I decided to add some breathing by adding holes in filter housing and porting manifold. When I first took carb off I was surprised that it didn't have the stock 182.5 mainjet, the guy before put in a DJ 160 main. The exhaust also looked sooty at end indicating it may have been running rich. After my modifications you could tell it was too lean. Here's a reference for a static look at float level from link, see 2 lower pictures for 1600 and 1700:

http://weislake.com/sig/mucker/carb/carbfloat/carbfloat.htm

Here's pictures of my testing setup. I took pictures of the float from both sides to see where my float was relative to the reference point from Weislake link. Than I made a setup using the pump to actually measure the level with gasoline. I want to point out that in a link from Weislake, Odo gives a procedure to check level on bench using water. DO NOT use water, it will give you a false level, the SG of gasoline is 0.73, water is SG 1.0. I filled and drained the bowl a couple of times to see if the level came back to the same point each time. I also moved tubing around to try to get best measurement.

http://s743.photobucket.com/user/rs900c/slideshow/Roadstar%20Midnight%20Siverado/Carb

After I finished, I thought that my fuel level was within the manual specifications, 4-5mm (0.16-0.20". But after thinking about it more I'm not sure. The RS manual illustration doesn't make it clear where the reference point is and their wording says that the "fuel level should be above the float chamber mating surface". The manuals illustration shows the carb in the normal position it would be on bike, but it looks like they are referencing the level lower than the machined body. If you were to follow this the fuel level would be about even with the surface that the bowl screws seat. Look at the pictures above, there is a pointer @ 295mm where the actual bowl sealing surface is. My fuel level is at the 300mm, but I'm questioning if the level should be at the 290mm in this picture. Note this picture is positioned as it would be on bike.

Odo's float bench check: http://weislake.com/sig/mucker/carb/carbfloat/float.pdf
 
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Last Edit: 2014/01/12 19:02 By RRSRoadstar1700.
 
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#726877
RRSRoadstar1700 (User)
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Re:Checking Float Level 4 Years, 1 Month ago  
Sorry this the last thread wasn't completed, I will follow up soon, got I distracted.
 
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#726958
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Re:Checking Float Level 4 Years, 1 Month ago  
After I finished, I thought that my fuel level was within the manual specifications, 4-5mm (0.16-0.20". But after thinking about it more I'm not sure. The RS manual illustration doesn't make it clear where the reference point is and their wording says that the "fuel level should be above the float chamber mating surface". The manuals illustration shows the carb in the normal position it would be on bike, but it looks like they are referencing the level lower than the machined body. If you were to follow this the fuel level would be about even with the surface that the bowl screws seat. Look at the pictures above, there is a pointer @ 295mm where the actual bowl sealing surface is. My fuel level is at the 300mm, but I'm questioning if the level should be at the 290mm in this picture. Note this picture is positioned as it would be on bike.


I've been looking more for my answer, I believe this is it:

http://roadstarclinic.com/component/option,com_fireboard/Itemid,187/func,view/catid,51/id,469889/#452982

If this is true, my current fuel level is correct, agreed?

 
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#726962
ultrastar (Moderator)
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#726965
GreenMachine (User)
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Re:Checking Float Level 4 Years, 1 Month ago  
I believe that you are measuring from the wrong side of the carb.
 
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#726967
SKWEARpeg (User)
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Re:Checking Float Level 4 Years, 1 Month ago  
Your good as long as that is the manifold side of the carb(looks like it). If the bike is sitting upright, and not leaning on the side stand, your fine.
 
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#726971
GreenMachine (User)
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Re:Checking Float Level 4 Years, 1 Month ago  
^^^ what SKWEARpeg said. If you are on the manifold side, then it looks to me like you are right on the money.
 
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#726976
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Re:Checking Float Level 4 Years, 1 Month ago  
GreenMachine wrote:
^^^ what SKWEARpeg said. If you are on the manifold side, then it looks to me like you are right on the money.

I think he must have slid his phone in there. It's a great picture. I'll have to save this to the link file. That one photo, has all the right ingredients .
 
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Last Edit: 2014/01/12 21:14 By SKWEARpeg.
 
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#726980
RRSRoadstar1700 (User)
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Re:Checking Float Level 4 Years, 1 Month ago  
The carb is on a stand and leveled, level measured from manifold side. See the Photo bucket link in fist post, it shows the setup and other pictures of level measurement.



 
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Last Edit: 2014/01/12 21:36 By RRSRoadstar1700.
 
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#726983
SKWEARpeg (User)
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Re:Checking Float Level 4 Years, 1 Month ago  
Know wonder the pic was so good

I'm not sure if the carb sits exactly level when it is mounted on the bike, and the bike is upright or not. You might double check that when you put it back, unless what you got going there is considered to be the same, in one of the links. I was thinking Texasscott had mentioned something about it once or twice.
 
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