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Author Topic: How do I check if a motor is free/frozen if not on a bike?  (Read 1178 times)

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Offline OneWheelDrive

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How do I check if a motor is free/frozen if not on a bike?
« on: November 05, 2010, 08:16:29 AM »
Going to check out a basket case 550 tomorrow that comes with an extra motor.  How do I check if the motor isn't seized if the kick start and shift levers have been removed?
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Offline Duke McDukiedook

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Re: How do I check if a motor is free/frozen if not on a bike?
« Reply #1 on: November 05, 2010, 08:20:55 AM »
Try and rotate the big nut to the crankshaft on the points side (you'll have to take the points plate off) clockwise.
If it rotates, the engine is not seized.
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Offline OneWheelDrive

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Re: How do I check if a motor is free/frozen if not on a bike?
« Reply #2 on: November 05, 2010, 08:29:00 AM »
Does it matter which gear it is in?
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1975 CB550 cafe
1971 CB500 stocker
2008 Ducati Hypermotard 1100S *sold*
1973 CB350F *sold*
1975 CB550K Project "Keeper" *sold*
2010 Ducati Monster S4RS *sold*
1976 CB360T *sold*
1974 CB550K *sold*
1973 CB750K *sold*
1978 CB550K *sold*
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Offline GammaFlat

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Re: How do I check if a motor is free/frozen if not on a bike?
« Reply #3 on: November 05, 2010, 08:30:50 AM »
Take a battery and some jumper cables with you.  Clamp one side to the case (negative) and the positive side to the starter wire.  This is how I got an engine "un-frozen" after wrestling with the kick starter.  The kick starter should turn over the engine.  It's a little cumbersome if the engine is on the floor.  
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Offline GammaFlat

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Re: How do I check if a motor is free/frozen if not on a bike?
« Reply #4 on: November 05, 2010, 08:32:25 AM »
Quote from: OneWheelDrive on November 05, 2010, 08:29:00 AM
Does it matter which gear it is in?

If the sprocket is not attached to anything (a chain, for example), it kinda doesn't matter.  The exception is if you have a locked transmission.  For that reason, put it in any gear to ensure the tranny isn't locked up.  You want to see the sprocket turn :) 
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Offline MCRider

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Re: How do I check if a motor is free/frozen if not on a bike?
« Reply #5 on: November 05, 2010, 08:35:50 AM »
Quote from: OneWheelDrive on November 05, 2010, 08:29:00 AM
Does it matter which gear it is in?
No without the chain attached, the trans is irrelevant to turning the engine. It would be nice to shift it thru all the gears which could involve rocking the engine crankshaft back and forth (with that crank nut) so the gears will mesh.
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Offline OneWheelDrive

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Re: How do I check if a motor is free/frozen if not on a bike?
« Reply #6 on: November 05, 2010, 09:00:47 AM »
Excellent, I'll keep ya posted!
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1975 CB550 cafe
1971 CB500 stocker
2008 Ducati Hypermotard 1100S *sold*
1973 CB350F *sold*
1975 CB550K Project "Keeper" *sold*
2010 Ducati Monster S4RS *sold*
1976 CB360T *sold*
1974 CB550K *sold*
1973 CB750K *sold*
1978 CB550K *sold*
2007 Vespa LX150 *sold*
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