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stacey brett wiltshire Posted on May 31, 2014
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Why wont my bike start when it gets hot ?....

It usually turns over after 3 or 4 kicks. Blows a heap of white smoke for a while but runs and idles spot on but if i stall it hot she dont want to go. The spark isn't what i would call great but there is spark

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5 Related Answers

Anonymous

  • 46 Answers
  • Posted on Mar 05, 2009

SOURCE: 2005 CRF450R Hard to start and wont idle

Hi
I would suggest that you have the valve clearances checked.

Also, check that the carb is clean. Pay particular attention to the PILOT JET as this opperates the idle circuit.

Jon

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Anonymous

  • 12 Answers
  • Posted on Mar 21, 2009

SOURCE: 1974 honda cb550 will not run?

• The first thing to do with ANY engine that has sat for any longer than a couple of months is to dump ALL the fuel in the tank and carb(s). ALL OF IT !! You'll want to refill with some high priced fuel that has fuel system cleaners (Like Chevron with Techron) not becasue you need high-test fuel, but because you need the cleaners. It's ether that or disassemble the carbs and clean out jets you can't find much less see. Your choice. The carb kits alone will cost you about $50 so a tank of high-test is looking pretty good, huh?

• Now the fact that you tried to crank the engine with old fuel has fouled the sparkplugs. All of them. Go buy all new sparkplugs.

tombones

  • 3567 Answers
  • Posted on Apr 15, 2009

SOURCE: stalling/hesitating during acceleration

Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road. If not, then remove the slide from the carb and move the clip on the jet needle one notch lower.

Please rate this solution. Thanks hanoidan2005!

tombones

  • 3567 Answers
  • Posted on Apr 19, 2009

SOURCE: bike wont start

Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Clean the air filter. Install a new stock NGK spark plug.

Please rate this solution. Thanks!

Anonymous

  • 2 Answers
  • Posted on Apr 21, 2009

SOURCE: my 2005 crf250r wont start by kicking it

your starter jet is plugged...u must have left the bike sit for a while with out draining the gas

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This may help you determine the problem.
1. is sprkplug oil fouled? wet? dry? superhot and white electrode?
A sparkplug will always tell you whats going on.
if its too wet then its not burning all the fuel and oil and flooding out.
if its extremely hot and white, then its running lean , and needs more fuel.
also make sure your running 50:1 fuel oil mix.
a hot two stroke is hard to start.
if plug is dry, then its not getting enough fuel.

2. make sure your fuel oil mixture is 50:1.
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way to much oil will oil foul the plug and plug will have oil on it.
to little oil will make the bike run hot and start damaging the bottom end crank bearings as well as your rings , then piston and cylinder walls.
the plug will be whitish and hot.

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a coil that is going bad will work cold but may not when it gets warmed up

to sum it up check to make sure you have correct fuel mixture
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if you have good spark, good fuel, good compression, then it should start within 2 kicks everytime.
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I have a 1998 hyundai excel running rough as if only on 2 or 3 cylinders starts 1st time but running realy bad and blows heaps of white smoke I can drive it and you can feel it not running on all cylinders...
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ALWAYS have a fire extinguisher on hand when working on carburetors.
Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Check the jet needle clip on the top of the needle. Put it in mid-range. Put the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine.

I just thought of somthing. You may be creating the rich mix problem yourself. See the following starting instructions.

There is a proper way to start the engine. Four controls are on your bike to assist in starting.
  • The choke, used when the engine is cold. Pull the red knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • The throttle, used to prime the cylinder.
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Now release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. Now give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from the kick lever. This happens in the case of a misfire, aka > backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting.

A “very helpful” rating for this answer? Thanks!
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