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

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I have spark and getting fuel won't start

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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...

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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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Mar 08, 2009 | 2004 Honda CRF 150 F

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