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Terrible Gas Mileage (Read 1240 times)
Kulisz
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Re: Terrible Gas Mileage
Reply #45 - 09/05/08 at 15:06:42
 
Sorry its taken me so long to get back but with school and work its hard to find time to eat much less get the tools out.

I tried the idea with putting a hose underneath the carb to see if the fuel would rise above the level of the carb bowl and after 4 trials and severl ounces of gas all over me my results seem unclear. 3 times the level stayed pretty constant with the level of the top of the bowl but one trial the gas came shooting out the top of the hose that was several inches higher than the bowl.

I'm about to use some part numbers from the carb diagram on http://www.bikebandit.com/houseofmotorcycles/suzuki-motorcycle-ls650pv-savage... page.

I remember when I was cleaning the carb I thought that the filter (20) that goes with the float needle was also metal so i through it in the carb cleaner for good measure.

I dont entirely know how the whole float needle system works at all so im just grasping at air for hope in getting my bike working again, but if this filter (part 20) isnt metal and the carb cleaner ruined it somehow, is this a possible reason for the bike to idle like a champ and yet die when revved or primed?

Also a side note you all might find funny. The first container i used to catch the gas that came out of the bowl when i first undid its screw was a plastic cup. I set the cup down on a wooden table that i cover with newspaper as a tiny portable workbench. so i went to pick up the cup to poor the gas back in and the gas had eaten away the bottom of the cop so when i lifted it all came out the bottom like and old school bugs bunny episode. gotta find the good in the bad.
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Yonuh Adisi FSO
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Re: Terrible Gas Mileage
Reply #46 - 09/05/08 at 17:46:19
 
Kulisz wrote on 09/05/08 at 15:06:42:
Also a side note you all might find funny. The first container i used to catch the gas that came out of the bowl when i first undid its screw was a plastic cup. I set the cup down on a wooden table that i cover with newspaper as a tiny portable workbench. so i went to pick up the cup to poor the gas back in and the gas had eaten away the bottom of the cop so when i lifted it all came out the bottom like and old school bugs bunny episode. gotta find the good in the bad.


That is why I always tear an aluminum can in half and use it for tests like that.  Wink Wink
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Check out Flight of Destiny http://www.amazon.com/dp/B00H9130XC
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Re: Terrible Gas Mileage
Reply #47 - 09/05/08 at 18:50:25
 
Quote:
I dont entirely know how the whole float needle system works at all so im just grasping at air for hope in getting my bike working again, but if this filter (part 20) isnt metal and the carb cleaner ruined it somehow, is this a possible reason for the bike to idle like a champ and yet die when revved or primed?


Im pretty sure part 20 is like a metal mesh type screen. However part 21 is an o-ring that slides on the valve and fits in a groove. It it was soaked in carb spray it could cause it to leak with gas comming from around the valve instead of up through it. Im not sure if this would be whats causing it to die when u give it gas though.
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Kulisz
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Re: Terrible Gas Mileage
Reply #48 - 09/05/08 at 19:19:12
 
Yeah I learned at a young age playing paintball to take care of the O-rings. So no worries friend, I took that baby off before they took the dip.
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Re: Terrible Gas Mileage
Reply #49 - 09/06/08 at 06:46:36
 
The float system in a carburetor works just exactly like the float valve in a toilet tank, except for being smaller. It has a float, which floats in the fuel in the bowl. That float is linked to a needle valve which controls fuel flow. If the fuel is low in the bowl, the float drops and allows the fuel valve to open. The open valve allows fuel to flow into the bowl. When the fuel rises high enough the float rises and shuts off the flow. The overall effect is to control the fuel level in the bowl fairly closely. The fuel level in the bowl is important, because if it is wrong the rest of the carburetor won't work correctly.

Problems arise when:
The needle valve is worn and cannot control the fuel correctly.
The float is damaged and no longer floats at the right level.
Dirt particles get caught in the needle valve and hold it open.
Water or dirt gets into the bowl.
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Eschew obfuscation.

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Kulisz
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Re: Terrible Gas Mileage
Reply #50 - 09/08/08 at 21:25:48
 
I took off the bowl again and took a closer look at the float and needle valve. everything looks perfect there and i checked the clymer to make sure the float isnt upside down or anything silly like that.  I read about adjusting the little flap on the float to change richness of the fuel and i tried that and the bike wouldnt idle well and still died on rev. so i put it back to where it started and we are back to the same old problem.

I found another carb on ebay for $85 with shipping.... do I dare? I figure giving this bike to a mechanic would cost at least that much in labor to identify the problem.

help =)
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We don't expect kittens to fight wildcats and win, we merely expect them to try.

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justin_o_guy2
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Re: Terrible Gas Mileage
Reply #51 - 09/08/08 at 23:49:54
 
The flap on the float is to set the level of the fuel in the bowl. The idea is to fil the bowl without flooding the bike. Setting the float a bit lower than the book calls for may be fine, but higher invites allowing too much fuel in. A piece of tubing on the nipple on the carb bowl, with the bike sitting upright, will allow you to see where the fluid level is in the bowl.
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Re: Terrible Gas Mileage
Reply #52 - 09/09/08 at 00:14:31
 
Kulisz wrote on 09/05/08 at 15:06:42:
Also a side note,gas had eaten away the bottom of the cop so when i lifted it all came out the bottom like and old school bugs bunny episode. gotta find the good in the bad.


LOL!...hate it when that happens.....

Use to have an old dog "Shandy", she always liked to help...I'm pulling weeds, she pulls weeds too. When I'm working on the car/bike,...every time I turn my back, she's taken parts I've removed...and removed them....
Rigged a speaker magnet to a pole so I could comb the yard for lugnuts etc. when I was done.....she meant well...
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Ludicrous Speed !... ... Huh...
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Kulisz
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Re: Terrible Gas Mileage
Reply #53 - 09/14/08 at 01:12:58
 
Just when I thought I had the answer. I bought another carb and the problem remains. the bike idles like a champ and dies when revved up. I know you have been with this thread for a while and i really do appreciate all of your support but does anyone have any ideas?
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Re: Terrible Gas Mileage
Reply #54 - 09/14/08 at 06:59:23
 
Did you ever pull the spark plug out?  If so, what did it look like?  If not, that's the next place I'd go if it were mine.

Also, where do you have your valves set?
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Savage: (adj)1. Wild 2. Uncivilized : Primitive 3. Ferocious 4. Cruel or merciless : Brutal --- Webster's. (n.) 1. A motorcycle named for its seat.--- Sandy's unabridged
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Kulisz
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Re: Terrible Gas Mileage
Reply #55 - 09/14/08 at 09:56:29
 
I never found a socket that would fit down in there but i talked to the guy who sold me the bike and he told me that he did change the spark plug just days before selling it. as far as valves, im afraid youve lost me...
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Sandy Koocanusa
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Re: Terrible Gas Mileage
Reply #56 - 09/14/08 at 10:45:05
 
Well, you have fuel flow from the tank, and two carburetors are not likely to have the same exact problem (although it wouldn't be unheard of).  So let's assume the problem is not fuel related for the moment...

The three requirements for combustion of any kind are: fuel, oxygen, and heat.  Fuel and air are covered already, so I'm thinking heat (spark) is a likely candidate.  


When you rev the engine and it dies, does it go softly?  Does it backfire?  Does it stop suddenly, like it would if you dropped the clutch with the brake on?  Does it cough and sputter and try to run, but then just give up?
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Savage: (adj)1. Wild 2. Uncivilized : Primitive 3. Ferocious 4. Cruel or merciless : Brutal --- Webster's. (n.) 1. A motorcycle named for its seat.--- Sandy's unabridged
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Kulisz
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Re: Terrible Gas Mileage
Reply #57 - 09/14/08 at 11:24:47
 
It is a very soft death of the engine, there is no backfire. it doesnt sputter. i guess it would be like letting the clutch out with the break on. I went to another 3 stores and finally hit up sears which now that i have finally seen the inside of might be a first stop from now on. i have the right socket and im about to get a new spark plug. i will let you know.
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Re: Terrible Gas Mileage
Reply #58 - 09/14/08 at 12:45:18
 
Alright one deep drive thin walled 18mm socket and spark plug later... same problem? This is confusing. I made a video of it dying and I will have it on youtube shortly.

Air+Gas+Spark= nothing? so confusing!!!!
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We don't expect kittens to fight wildcats and win, we merely expect them to try.

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Kulisz
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Re: Terrible Gas Mileage
Reply #59 - 09/14/08 at 12:58:06
 
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We don't expect kittens to fight wildcats and win, we merely expect them to try.

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