Question about 2004 Honda CRF 150 F

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My 70cc has spark air going into the carbarater it is 4 stroke and i put starting fluid into the carbarater and it did not even jump and then i tried running with it and popped it up into 1st gear and it kind of started up but died so and i dont know what to do can you please help me oh and it is an automattic and it just wont start

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  • Anonymous Mar 14, 2009

    the first thing i checked was if it had spark and it did oh and the spark plug is clean and there is fuel in the cylinder and it just wont start

  • Anonymous Mar 15, 2009

    it has spark and the sparkplug is clean and there is fuel going into the cylinder but it just wont start and i sprayed starting fluid into the cylinder while my dad kicked it and he said that it should fire right up bur it didnt so i need help so i can get it running but it wont fire it is a

    xr70cc it is pretty old but i need a bigger bike so i ride a little 70cc

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What does the spark plug look like? Make sure you are getting spark.

Posted on Mar 09, 2009

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1 Answer

How do I fix a Stihl ts420 that won't start?


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probably because the third component to make an engine run is missing and that is compression
If it is 4 stroke then it will be a valve problem or rings--if 2 stroke it will be crank shaft seals or rings
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How much oil would i put in my 70cc 4 stroke sunl


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What is spark plug gap on 4 stroke 70cc engine?


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The Honda CRF70F 2003-2005 has a 70cc engine and uses a spark plug gap of .7 mm.

Sep 09, 2011 | 2005 Honda CRF 100 F

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I have spark and getting fuel won't start


if its a 2 stroke then you need fuel spark and air to get the bike to start have you got compression? check it by removing the spark plug and put your finger over the hole air try and start the bike your finger should be pulled into the hole if not then a piston ring is either cracked or broken

open the air box and check the filter then clean the carb thats all you need for a 2 stroke

if its a 4 stroke then again check the air filter and compression remember that a 4 stroke doesnt have the oil with the fuel it goes in a separate chamber

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My 2002 crf450 r workef fine prior to fall storage now I can't get it started. I put a new plug in and it had new oil when it was stored. This is my first 4 stroke I always had 2 stroke bikes are they...


Go easy on twisting the throttle. Every time you twist, a shot of raw gas goes into the carb. The bike will flood easily. Put in a new spark plug, clean the air filter and drain the carb float bowl. Then get a can of starting spray. Spray into the air filter and then try to start it. The gas valve is turned on isn't it? Please rate my answer. Thanks.

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I need a manual for my elnita 250 by elna. It hasn't been used in 20 years so I want to make sure i'm maintaining it properly before I use it.


There are a few things I would recommend; get some Marvel mystery oil, remove spark plug and fill cylinder with the marvel. allow to sit at least overnight before draining and pull the starter a couple times to free up the piston rings. While you are waiting, remove the carb and fuel tank - flush both with starting fluid first then fresh fuel. If you are familiar with carburetors and air / fuel jets, count the turns on each respectively to bottom then remove. Soak in starting fluid for at least an hour and flush out respective ports with starting fluid then carb cleaner then fresh fuel. Use non - lubricated starting fluid as you want the highest concentration of Ether to break loose the varnished fuel.Flush out fuel lines and primer bubble ( if equipped) with fresh fuel and spark plug out. You can best do this by re - installing fuel tank and filling with fresh mixed fuel, adding the fuel stabilizer at double the recommended strength - this will not harm the motor, just help it start and stay running. Place an air hose blow nozzle in the mouth of the tank, wrap with a clean rag and gently blast air into the tank until 1/4 of fuel in tank has passed through. Cap tank and turn saw over to drain the fuel out of the cylinder, giving it at least 10 minutes to drain. Now replace spark plug and follow starting procedures - you should have it running strong now!! If it refuses to start or sputter in the first 5 pulls, remove spark plug and shoot a 2 second blast of lubricated starting fluid into the cylinder. Install plug and start. You may have varnish issues due to the lengthy storage time and you may be better served by getting a rebuild kit for the carb and rebuilding it or even replacing carb. Fortunately 2 stroke carbs are much easier to rebuild than a 4 stroke.
Good luck!!!

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How electronic ignition work.can we put single cylinder electronic ignition in twin cylinder.


Hi sonpmayank
The single coil ignition system works on a twin cyclinder 4 stroke motor by sparking every revolution. In other words, whilst one cyclinder is on a power stroke, the pother has just started an intake stroke, and so both spark plugs can fire together every revolution using a single coil.
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I HAVE A 2000 DERBI MANHATAN 49CC. I JUST REPLACED THE CILINDER AND PISTON NOW MY MOTORCYCLE IS A 70CC WITH THE SAME CARBURATOR BUT IT DOES NOT START. IT HAS SPARCK FUEL BUT THE ENGINE DOES NOT START.COULD...


Who said the swap would work? If it was the dealers shop mechanic then it may work. Anyone else and I would be doubtfull.
The old Yamaha 125 / 175 could swap. The key is the stroke length. You are changing the bore, no big deal. BUT if the stroke is different the swap will not work.

Check with the dealers parts department. Look at the engine specs of the 49cc and the 70cc. If the stroke is the same, then it MAY work. A few unknowns are present. Ignoring the unknowns, did you use new cylinder base and head gaskets? New carb and manifold gaskets? Where is the 70cc carb and manifold? You have 42% more gas/air mix needed but a carb designed for 42% less than now needed. If nothing else, the engine may be starving for fuel. Granted the carb may have the 70cc capacity, but the only way to tell is by compairing the part numbers at the dealers.

One last thought. If the engine is a two stroke, how good are the crank seals? You are increasing the bottom end pressure by the swap. How much pressure is getting past the seals? Lower than needed pressure = no go.

Please rate this solution. Thanks!

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My honda 70cc has spark gas and air going to the carberater


put your hand over the carberatoer to choke it while your dad kicks it and after about 3-4 kicks in the middle of him kicking et go and it should build up enouphg pressure to start it up.ive used this method many times on my 200cc yamaha

Mar 08, 2009 | 2004 Honda CRF 150 F

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