98 cr 250 troubleshoot

codyc1993
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codyc1993
Completely rebuilt top and bottom end. Had the cylinder and piston sent of to be replated. After I got the cylinder on I hand cranked it over by hand. Everything was silky smooth, but after I got the head on and the motor back on the bike. Ready to crank the motor won’t even turn over. Not by kickstart or flywheel. It was never kicked only turned by hand when it was on the table. I’ve pulled the head off, but still no luck. Absolutely out of ideas.
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FGR01
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FGR01 8/22/2020 3:08pm
8/22/2020 3:08pm
Sounds like the crank is not centered or one of the main bearings is not fully seated in the cases.
DynoDan22
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DynoDan22 8/22/2020 4:10pm
8/22/2020 4:10pm
Did you accidentally put a domed piston in instead of a flat top? If everything was smooth until you out the head on something seems off like the piston is contacting the head.
Paul_Pitzonka
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Paul_Pitzonka 8/22/2020 4:15pm
8/22/2020 4:15pm
FGR01 wrote:
Sounds like the crank is not centered or one of the main bearings is not fully seated in the cases.
This is a definite possibility... I’d start by removing the primary gear and see if the crank is still bound...
codyc1993
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codyc1993 8/22/2020 7:36pm
8/22/2020 7:36pm
FGR01 wrote:
Sounds like the crank is not centered or one of the main bearings is not fully seated in the cases.
It’s very possible will the it may not be centered the bearings went in as should. I will definitely be checking it. I loosened the stud bolt and it immediately freed the piston up

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codyc1993
Profile picture for user codyc1993
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7
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Flint, TX US
codyc1993 8/22/2020 7:37pm
8/22/2020 7:37pm
FGR01 wrote:
Sounds like the crank is not centered or one of the main bearings is not fully seated in the cases.
Paul_Pitzonka wrote:
This is a definite possibility... I’d start by removing the primary gear and see if the crank is still bound...
Ok will check it for sure!

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