problem with chainsaw engine crankshaft

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  #1  
Old 06-17-06, 03:09 PM
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problem with chainsaw engine crankshaft

hi all,
i build a motorized scooter with a Stihl chainsaw engine, i put a wrong ratio without a cluch and what happen is the end of the crank shaft was broke .
what should i do to put a pulley on the crankshaft ?

friend was tell me to take a tube that "sit" good on the broke crank shaft, take the tube heated (not on the engine) and spray on the crankshaft fire extinguisher and put the hot tube quickly on the crank and that make the crank longer.

what do you think about this idea ?
ther is any idea that good and easy of that idea ?

the picture of the engine

thanks alot,
avi .
 
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  #2  
Old 06-18-06, 06:23 PM
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why not get a new crank and put it in? putting something "over" it will probably end up slipping sooner or later.
 
  #3  
Old 06-19-06, 12:25 AM
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I try to find new or used crank and i didn't find one for my model (fs200AV), also i see other models cranks and their really expensive.
if all u can try to help me find details about this engine it can realy help me .
 
  #4  
Old 06-19-06, 08:42 AM
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Hi, All is not lost with this crankshaft. I had repairs made like this but I only did it because the old 2 stoke I had was so old I couldn't find parts. The job wasn't cheap. Have a machinist cut a shaft on a lathe the right OD. Have a welder weld your new shaft to the crankshaft. Then find a engine building machine shop and have the crankshaft balanced. Bring the new pulley when you have it balanced.

Best regards, Jeff Z.
 
  #5  
Old 06-19-06, 11:00 AM
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looks like my problem...
i heard to weld somthing to the shaft i need a special electrode for casting or i can use a regular electrode ?

thanks about the helping guys!!!
 
  #6  
Old 06-19-06, 11:32 PM
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if you speak german you can get a whole weedeater here:
http://cgi.ebay.de/Motorsense-Stihl-...QQcmdZViewItem

sounds like it would be easier/cheaper/better to buy a new motor. lots of them on ebay pretty cheap.
 
  #7  
Old 06-20-06, 05:22 AM
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Yes, There is a wire for cast.
Best regards, Jeff Z.
 
  #8  
Old 06-22-06, 12:04 PM
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dude my engine is from chain saw as you see in the picture .
what about my question about the electrode ?

avi .
 
  #9  
Old 06-22-06, 02:56 PM
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dude...if you looked at the picture you would see it's the same motor. And...you can get a ready to run 49cc new engine on ebay for around 60 bucks, why not switch?
 
  #10  
Old 06-22-06, 08:07 PM
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There are electrodes and or wire you can buy for welding cast.
Best regards, Jeff Z.
 
  #11  
Old 06-22-06, 10:03 PM
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thanks but what should i use for the engine ? cast or regular electrodes ?
 
  #12  
Old 06-23-06, 05:27 AM
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Hi, That depends on what kind of welder is going to be used. A stick welder or a wire welder.
Best regards, Jeff Z.
 
  #13  
Old 06-23-06, 07:17 AM
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my welder is a stick welder.
 
  #14  
Old 07-01-06, 10:17 PM
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HI, Then you need electrodes for cast. Ask your welding supplier for them.
Best regards, Jeff Z.
 
  #15  
Old 07-11-06, 06:48 AM
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Tae, that weedeater is going for over 600 Euros. Is that reasonable?
 
  #16  
Old 07-11-06, 08:57 PM
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looks like it ended at about $500.00 . Thats kinda high, even compared to others selling on there. About twice as much. It had 31 bids, and 2 people wanted it pretty bad, looking at the bids. Over 700 views! Wow.
That other one(new still in box is at 600 euros, around $760.00. I think i need to start selling weed eaters over there!
 
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