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Message started by Thithib on 08/17/19 at 02:49:36

Title: Exhaust pipe spit out gasoline when starting
Post by Thithib on 08/17/19 at 02:49:36

Hello! I have a 1993 Savage which i turned into a bobber. I changed the tank, the tap and the carburetor has been cleaned up. Petcock is now blocked. New air filter (cone)
I did first tests yesterday.

When i let the tap open for a moment (engine off) and then i start the engine it spit out gasoline through the exhaust. Once all the gasoline has been removed it start and run normally.
Any guess?
(float issue? tap not adapted?)

Tell me if you need more informations on the bike.

Title: Re: Exhaust pipe spit out gasoline when starting
Post by justin_o_guy2 on 08/17/19 at 03:34:42

I'd be checking out the oil. If you're getting gas in the exhaust, it's not good.
You say
Petcock blocked
Is that the vacuum line that is blocked?

Title: Re: Exhaust pipe spit out gasoline when starting
Post by Thithib on 08/17/19 at 03:39:57

I replaced oil couple days ago. 2 liters.

Yes the vacum line. I putted a plug on it.

Title: Re: Exhaust pipe spit out gasoline when starting
Post by justin_o_guy2 on 08/17/19 at 05:37:14

Gas is probably still getting in the oil.
If you have not been in the carburetor
It's time.
Those are not number two Philips head, they are J.I.S.,

I'm too tired to be helpful.
Gotta get to the er today.

Title: Re: Exhaust pipe spit out gasoline when starting
Post by batman on 08/17/19 at 06:48:49

The last thing the fuel goes through to get to the bowl is the float valve, either the float level is set wrong, the float has a leak and fuel got inside making it sink ( shake it ), the float valve is worn (look for a ring around the tip), or fuel is leaking around the float valve seat ( the seat pulls out and there is an O- ring seal {fuel resistant } around the outside ). You'll need to check all of these things, and keep an eye on your oil level ,if it's going up you'll need to change it again ,but find the problem first. Good Luck.

Title: Re: Exhaust pipe spit out gasoline when starting
Post by Ed L. on 08/17/19 at 06:55:00

I'm with batman on the float being the problem. Could be some dirt sticking the float needle open or a bad float. Usually with a bad float the bike runs on choke but stalls without the choke. Drop the bowel and see what's going on to start with. Let us know what you find.

Title: Re: Exhaust pipe spit out gasoline when starting
Post by Thithib on 08/18/19 at 02:09:39

Thank you for your help. I will check that. I need to understand the carb anyway :). Probably a missing gasket.
Im wondering how could the fuel rich the oil?? Which path?
To me there is a leak somehow in the carb, this leak flow to the explotion chamber and when i try to start the engine, compression push it out in the exhaust. And as soon as all extra fuel as been removed, it start and run normally.

Title: Re: Exhaust pipe spit out gasoline when starting
Post by justin_o_guy2 on 08/18/19 at 03:59:13

And while it's in the cylinder, it's washing oil off the cylinder walls and rings. Very much not good.
And working its way down between the piston and cylinder wall, draining into the oil,
Another
Very much not good
Event.

As was stated above
The float valve isn't closing.
Solve the problem
Then change the oil
And just because you can get it to run and can ride , doesn't mean you should.
I'd suggest not even starting it again until you have worked out the problem with the carburetor.
Then dump the oil and put fresh in.

Title: Re: Exhaust pipe spit out gasoline when starting
Post by batman on 08/18/19 at 08:36:23

fuel path, if the float valve doesn't hold , the float bowl over fills , gas comes up into the carb throat , it can run two ways, into the cylinder(explosion chamber) or into the air filter box, OR BOTH ( check and drain the box- there's a hose with a plug ,under the swing arm , replace the plug when done). If it runs into the cylinder it runs past the piston rings into the oil in the bottom of the motor.