[ReturnoftheReal]

I have an 87 250R. Bike runs great just riding around. If I run it through the gears and hold it pined it acts like it runs out of gas. Bike will almost just kill and if I stop it wont idle without pumping the throttle. After 30+ seconds it recovers and is ready to go again. I have went through the obviose to me. Float level is great plug looks great. Carb is clean. Float bowl fills right up with fuel. Cleaned in tank filter. Compresion is great. Tried new plug and coil. Air filter is clean. Just looking for ideas. Any help would be appreciated.

 

[chad350r]

I have an 87 250R. Bike runs great just riding around. If I run it through the gears and hold it pined it acts like it runs out of gas. Bike will almost just kill and if I stop it wont idle without pumping the throttle. After 30+ seconds it recovers and is ready to go again. I have went through the obviose to me. Float level is great plug looks great. Carb is clean. Float bowl fills right up with fuel. Cleaned in tank filter. Compresion is great. Tried new plug and coil. Air filter is clean. Just looking for ideas. Any help would be appreciated.

make sure your petcock is letting enough fuel delivery.

 

[2R's]

1 easy check is make sure the gas tank is venting properly

 

[ReturnoftheReal]

1 easy check is make sure the gas tank is venting properly

I guess if I run it up the road without a gas cap that will answer that question?

 

[RebelBanshee]

cracking the gas cap would probably do the same thing. You might end up with gas on your lap with it off.

 

[mstohner]

have you played with the carb adjustment to see if it will run better. if the carb is not adjusted right it will run like carp.

 

[ReturnoftheReal]

have you played with the carb adjustment to see if it will run better. if the carb is not adjusted right it will run like carp.

I have jetted, played around with needle location, checked float levels and cleaned. Cant think of anything else on the carb side. im going to give it a try with the vent tube removed or the cap cracked and see what happens. If not I guess Ill throw a carb off another bike on it and see if that changes the problem. Just getting frustrated.

 

[mstohner]

make sure lines to the petcock are not kinked or pinched.

 

[ReturnoftheReal]

make sure lines to the petcock are not kinked or pinched.

Just went and tried the vent tube. Same thing with cap on or off.
Checked lines to petcock yesterday all looks good.

 

[ReturnoftheReal]

When it cuts out the fuel line to the carb (its clear) appears to still be full of fuel.

 

[mstohner]

when you look at the plug is it after riding just around or after it when its fells like it is out of gas. when i do my plug readings i do them in 4th. just hold 4th wide open as long as i can then kill and come to a stop and pull the plug.

 

[mstohner]

what color is the plug when you looked at it?

 

[ReturnoftheReal]

what color is the plug when you looked at it?

When it quits I shut it off coast to a stop and pull the plug. Slightly lean but not real bad. Light brown mostly.

 

[mstohner]

try uping a jet size i run my plugs so they are a dark brown nice and rich.

 

[ReturnoftheReal]

try uping a jet size i run my plugs so they are a dark brown nice and rich.

Well that verifies she must be running out of fuel. Went from a 150 to a 170 main jet. Plug still looks the same.

 

[ReturnoftheReal]

I believe the fuel is getting from the tank to the carb efficiantly. As stated earlier I went through the petcock and filter in side the tank. Tested the floats by setting them and then attaching fuel line and filling the bowl to verify fuel level. Driven me crazy.

 

[Teddy250R]

Sounds like you are wayy to lean on the top end and it is running out of fuel.

This means that their is no fuel in the bowl when it is cutting out and won't go.

So when it takes about 30 seconds to get back to running fine again is when the bowl is filling itself back up with fuel. Need to go fatter.

Teddy

 

[ReturnoftheReal]

Sounds like you are wayy to lean on the top end and it is running out of fuel.

This means that their is no fuel in the bowl when it is cutting out and won't go.

So when it takes about 30 seconds to get back to running fine again is when the bowl is filling itself back up with fuel. Need to go fatter.

Teddy

The only thing I dont get is I have ran it at the dunes multiple times with the current set up. Seems if it would have been that lean Id have blown her up long ago. I did change reeds when the problem started could that effect my jetting that far?

 

[mstohner]

is the temp different now than before that can play a role in jetting

 

[ReturnoftheReal]

is the temp different now than before that can play a role in jetting

It sure is colder. 32 degrees for a high.