1990 Yamaha SRV 540 - HCS Snowmobile Forums

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Old 05-20-2019, 09:12 PM   #1 (permalink)
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Default 1990 Yamaha SRV 540

Holy smokes guys, I'm at the end of my wits and I know it's just me being stupid.

Picked up an ultra clean SRV540 at a garage sale for $250. 4700 original miles, immaculate. Only catch: it didn't run. Guy said he put gas in the plugs and it fired.

So that means: fuel problem. Ok, got it. Pull the carb and there's gunk in there almost like a squirrel was chewing up nuts. Vacuum out the carb, the airbox, clean the carb three separate times with carb cleaner and compressed air. Pull reeds, inspect, clean out manifold. Has compression. Reassemble, pull and pull and pull, nothing.

Must be the fuel pump, right. Pull the gas line from the carb, put the end in a water bottle and pull, shoots gas with every pull. Not the pump. Pull the carb, full of gas. Pull the plugs: dry. Not an OUNCE of gas getting to the cylinders. Poured some gas down the holes and pull, fired on the first one. Pull carb, clean again, ensure everything secure, reassemble. Pull pull pull pull nothing, full carb and DRY cylinders. Not a drop of fuel reaching the plugs.

WTF? This just cannot be that complicated. A 1990 SRV isn't space age technology. Somebody, for the love of god, tell me what i'm forgetting. Im going insane.

Thanks
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Old 05-20-2019, 09:28 PM   #2 (permalink)
cfm
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Did you work hr float and see if air came out of there when you blew air in thru the inlet ?

How about the air bleeds ? If they are plugged fully or partia;y fuel won't flow correctly out of carb . I've seen mouse piss corrode bleeds shut,

Just asking because one persons carb cleanings can be very different from the others,,,,like my old man's vs mine. He;s just spray everything on the exterior and call it cleaned. LOL,
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Last edited by cfm; 05-20-2019 at 09:30 PM.
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Old 05-20-2019, 09:37 PM   #3 (permalink)
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Join Date: Aug 2014
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Current Sled(s): 2015 Ski-Doo Renegade X 800 ETEC
Previous Sled(s): 2000 Polaris 700 SKS, 2010 Polaris IQ Turbo Dragon
Location: Wisconsin
Favorite Riding Area: Turtle Flambeau Flowage
19-20 Mileage:
18-19 Mileage: 2143
17-18 Mileage: 1565
16-17 Mileage: 1980
Age: 21
Riding Since: 2007
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Originally Posted by cfm View Post
Did you work hr float and see if air came out of there when you blew air in thru the inlet ?

How about the air bleeds ? If they are plugged fully or partia;y fuel won't flow correctly out of carb . I've seen mouse piss corrode bleeds shut,

Just asking because one persons carb cleanings can be very different from the others,,,,like my old man's vs mine. He;s just spray everything on the exterior and call it cleaned. LOL,
Haha yeah i get you. I pulled ever single piece out of the carb, sprayed with cleaner and air. All jets, idle screw, float and valve, etc. Blew air and cleaner through any and every channel in the carb, including breather hoses. I also just verified the exhaust is free from obstruction. My blood pressure continues to rise
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Old 05-20-2019, 09:44 PM   #4 (permalink)
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calm down. you are not missing a big trip this week-end over it.
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Old 05-20-2019, 10:07 PM   #5 (permalink)
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Check to see if the fuel pick up fell off in the tank. I have seen many sleds get sold or parted out because it won't get gas, and won't run, and it's the fuel pick up that sends the gas from the tank to the fuel pump. The clue is it runs if you put gas in the cylinder and it pops off, but won't stay running.
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Old 05-20-2019, 10:14 PM   #6 (permalink)
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Join Date: Aug 2014
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Current Sled(s): 2015 Ski-Doo Renegade X 800 ETEC
Previous Sled(s): 2000 Polaris 700 SKS, 2010 Polaris IQ Turbo Dragon
Location: Wisconsin
Favorite Riding Area: Turtle Flambeau Flowage
19-20 Mileage:
18-19 Mileage: 2143
17-18 Mileage: 1565
16-17 Mileage: 1980
Age: 21
Riding Since: 2007
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Originally Posted by Frankie406 View Post
Check to see if the fuel pick up fell off in the tank. I have seen many sleds get sold or parted out because it won't get gas, and won't run, and it's the fuel pick up that sends the gas from the tank to the fuel pump. The clue is it runs if you put gas in the cylinder and it pops off, but won't stay running.
But if the carb is getting gas it should be good, right? With every pull of the cord a significant amount of gas sprays out of the line. The carb fills very quickly.
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Old 05-20-2019, 10:25 PM   #7 (permalink)
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Can you keep it running on a spray bottle through the carburetor after you pour some in the holes? I wonder if something could be in the base causing a blockage. Rag, mouse nest....anything is possible. Bad crank seal maybe? Maybe it pulls enough vacuum to run the pump but not pull it to cylinder. Sounds unlikely once I get it typed...
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Old 05-20-2019, 10:33 PM   #8 (permalink)
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Join Date: Aug 2014
Posts: 250
Current Sled(s): 2015 Ski-Doo Renegade X 800 ETEC
Previous Sled(s): 2000 Polaris 700 SKS, 2010 Polaris IQ Turbo Dragon
Location: Wisconsin
Favorite Riding Area: Turtle Flambeau Flowage
19-20 Mileage:
18-19 Mileage: 2143
17-18 Mileage: 1565
16-17 Mileage: 1980
Age: 21
Riding Since: 2007
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Originally Posted by fourh-ds View Post
Can you keep it running on a spray bottle through the carburetor after you pour some in the holes? I wonder if something could be in the base causing a blockage. Rag, mouse nest....anything is possible. Bad crank seal maybe? Maybe it pulls enough vacuum to run the pump but not pull it to cylinder. Sounds unlikely once I get it typed...
By in the base do you mean in the crank case? I considered that also, but it runs if i dump some in the plugs. And I know, ive been running these same potentials through my head...seems so unlikely that it has enough draw to fill the carb quickly but not get it to the cylinder.
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Old 05-20-2019, 10:38 PM   #9 (permalink)
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how old is all the fuel ?
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Old 05-20-2019, 10:47 PM   #10 (permalink)
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Join Date: Aug 2014
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Current Sled(s): 2015 Ski-Doo Renegade X 800 ETEC
Previous Sled(s): 2000 Polaris 700 SKS, 2010 Polaris IQ Turbo Dragon
Location: Wisconsin
Favorite Riding Area: Turtle Flambeau Flowage
19-20 Mileage:
18-19 Mileage: 2143
17-18 Mileage: 1565
16-17 Mileage: 1980
Age: 21
Riding Since: 2007
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how old is all the fuel ?
Brand new. Drained all the old crap and put fresh stuff in.
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