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Author Topic: Small amount of play in crankshaft  (Read 1151 times)

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Small amount of play in crankshaft
« on: May 07, 2017, 08:56:57 pm »
Bought a 86 has new topend already installed. He said it was sucking cc oil into the cylinder. I pulled the stator off and can just barely move the crank up and down. I know that is a sign of worn crank bearing. Guessing probably why the cc oil seals are bad. Does this mean my crank is also bad? Or can i just replace the crank bearings and seals, that is if the connecting rod is in good shape to the crank. The guy i bought it from said it was ok. Lol
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1992 lt250r
1985 sx250
2003 250ex
2015 ranger900xp

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Re: Small amount of play in crankshaft
« Reply #1 on: May 08, 2017, 08:15:33 am »
Typically it's just the bearings but it's worth inspecting since you're splitting the cases.
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Re: Small amount of play in crankshaft
« Reply #2 on: May 08, 2017, 04:10:46 pm »
Ok, thank you Q. Do you recommend a particular brand of bearings and seals. I have a cc seal kit already. Not sure of the brand, its definitely not suzuki. And what brand of gaskets. Just trying to fix right and flip it.
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2015 ranger900xp

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Re: Small amount of play in crankshaft
« Reply #3 on: May 08, 2017, 04:33:40 pm »
The complete oil seal kit i have is a k&s. Are these any good and worth using?
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1985 sx250
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2015 ranger900xp

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Re: Small amount of play in crankshaft
« Reply #4 on: May 09, 2017, 06:25:18 am »
usually go with OEM for seals, gaskets, and bearings.

I've used all balls and cometic and had good luck too.

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Re: Small amount of play in crankshaft
« Reply #5 on: May 09, 2017, 06:48:55 pm »
Its bored .030 over. Do i need a 71 or 72mm cometic gasket kit? Its shows different sizes.
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1985 sx250
2003 250ex
2015 ranger900xp

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Re: Small amount of play in crankshaft
« Reply #6 on: May 10, 2017, 01:54:09 pm »
.030" = .762mm

So you're at 70.762.

The 71mm gaskets should be fine.

grab a 71mm piston.  (it will be +/- 71mm so be sure to give the piston to the machinist to bore too)
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Re: Small amount of play in crankshaft
« Reply #7 on: May 11, 2017, 11:21:39 am »
I ordered the cometic c7070 top end gasket set. It says its a 72mm according to the cometic website. Its all they sell I think for the 85/86.  Will this be a problem? I got All Ballz crank bearings and a complete cometic gasket kit c7070 and c3363. I also got 3 different types of crank seal seals. I got cometic, all ballz, and s&k.  Which ones would you use?
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1992 lt250r
1985 sx250
2003 250ex
2015 ranger900xp
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