Question about 2004 Yamaha YZ 250 F

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A no start when hot starts and runs good when just warm or cold no start when fully warm

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There is a sequence to follow when these bikes are hot to get them started.But first.Does the bike start easily when hot if it is push started? If the answer is yes,you need to use the hot start pull switch on the carby and the get the motor in compression before you pull in the small compression lever and slowly push on the kickstarter halfway down.Release lever and fully kick the motor over from the top of the kickstarter.Don't let these bikes sit around idling.They will overheat because they need air to get through the radiator.Hope this helps

Posted on Sep 27, 2009

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Posted on Jan 02, 2017

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I have a 2007 gsxr 1000. When i start it up and its cold it runs fineas soon as it heats up to temp it starts sputtering and loses power and it dosent idle very well like its missing bad pls help thx


Plugs leads or coils breaking down when warm. Or it could be tight valves when the motor warms everything expands abe if there is not enough clearance in the valves they don't close fully and allow combustion pressure to leak out. To test this do a compression test when hot and cold and compare.

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2001 sunfire start good cold but not when engine is hot


It sounds like you have a "flooding" problem, where you are getting too much fuel on the warm start. It takes more fuel to start a cold engine than a warm one. By holding the pedal the pedal to the floor, you are telling the computer to do a "clear flood" operation, and that lets you start the car. The culprit is probably the Coolant Temperature Sensor. If this is faulty, it will tell the computer that that the coolant (thus the engine) is much cooler than it really is. This results in the engine flooding when warm. It may also run rough at idle after warm start since it is still getting too much fuel. You will also notice a massive loss of fuel economy. Replace the coolant temperature sensor.

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1 Answer

2000 malibu runs hot if not warmed up


How do you know it gets hot? Are you going by the temperature gauge on the dash? Or have you checked under the hood and found out the engine really is running hot? ...Reason I ask is, something just doesn't sound right in your description. After just 5 minutes from starting and driving away, the engine would not yet be at normal operating temperature. That would explain the heater not yet warm. But the temp. gauge says hot?
If so, I would replace the temperature sending unit on the engine. the one for the dash gauge, and see if that was the problem-not reading the temp. accurately.
Couple of other things: Are you sure you got all the air out of the coolant system? Start the car with the radiator cap off and let it run until the engine is warmed up fully, then shut it off and install the cap. Does your reservoir tank stay about half full where it should be, between the full-hot and full-cold marks?
If your problem persists. I would have the coolant system pressure tested, and see if you could get a true temperature reading of the coolant when it seems to be running hot.
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Mar 05, 2012 | Cars & Trucks

1 Answer

When my buick century 1995 is cold it will start but won't rev up. once it is hot it runs okay


Number of possibilities. See if you have any diagnostic codes stored. Could be throttle position sensor, coolant temp. sensor, hard to say. I would start with the codes. Does it start easy when warmed up, and run good? Boy, I just don't know.

Oct 30, 2011 | 1995 Buick Century

1 Answer

84 chevy running rough


Check the choke when cold. When its hot take notice that its opened. Upon starting next time when its cold look at the choke and see if its closed fully. It should be. If not push the throttle all the way open and let it retract closed. The choke should close when the engine is cold. If it does not the vacuum break is shot which should be the rear one that controls the choke. Yours may be on the front since some are but very few are made on the front

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On my wifes 2004 yukon, the engine warms up and the blower works fine, but it takes forever for the air to finally blow warmly. when it finally does, if we switch it to another location (floor or defrost),...


iwould check the selector motor,and also replace the thermostant,start with the stant first,the selector motor is what runs the door for hot or cold the motor is a common problem,if the temp gauge is showing a quick warm up temp then its the selector motor, if it takes a while to reach operating temp then replace the t-stant,also make sure the coolant is full in radiator,check when cold or warm,dont open when hot, hope this is helpful.

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1 Answer

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You might be too rich on the pilot jet. (Too large)
Run it for a minute with the choke on, then shut the choke off, and let it run with just a little thrttle till it's warm. If it doesn't "clear" up, your jetting may be off. (The pilot does idle) Pull the plug to see what color it is. Black is too rich. (Too large of a jet)

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I would replace the coil. and condenser.

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