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Old 08-21-2010, 05:38 AM   #1
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Default help please. flywheel/

Ok. This is going to be hard to describe but i will do my best. I have a new jpx .21. Well, after i tighten the flywheel it has a lot of resistance when i turn it. THe piston is moving up and down, but it's almost like i can feels all the balls in the bearings dragging. Maybe like the flywheel is rubing up against the crank case? It's hard to explain, but its only when i tighten it, and it's alot of jaggy resistance.
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Old 08-21-2010, 05:51 AM   #2
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Ok. This is going to be hard to describe but i will do my best. I have a new jpx .21. Well, after i tighten the flywheel it has a lot of resistance when i turn it. THe piston is moving up and down, but it's almost like i can feels all the balls in the bearings dragging. Maybe like the flywheel is rubing up against the crank case? It's hard to explain, but its only when i tighten it, and it's alot of jaggy resistance.
I'd go with that..Put a different collet on or more shims behind it and see what happens.
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Old 08-21-2010, 05:52 AM   #3
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anyone? Is it the bearings not being seated properly?
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Old 08-21-2010, 05:59 AM   #4
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I'd go with that..Put a different collet on or more shims behind it and see what happens.
+ 2
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Old 08-21-2010, 06:01 AM   #5
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+3.... Put a shim behind the collet
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Old 08-21-2010, 06:12 AM   #6
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that's not it.
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Old 08-21-2010, 06:15 AM   #7
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it's almost like when you tighten the flywheel, the outer edge of the crank is hitting/rubing on the outer cage on the rear bearing. I cannot describe how frustrating this is.
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Old 08-21-2010, 06:23 AM   #8
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so you did try a new collet?
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Old 08-21-2010, 06:27 AM   #9
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bad front bearing.
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Old 08-21-2010, 06:39 AM   #10
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bad front bearing.
really? your NEW engine came with a bad bearing?
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Old 08-21-2010, 06:42 AM   #11
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yup. took the crank out and the balls are catching inside the bearing. I have been looking foward to running this motor for 2 weeks for this weekend and a BAD bearing. UNBELEIVABLE. I thought ITALIAN motors were SO HIGH quality.

What a joke
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Old 08-21-2010, 07:46 AM   #12
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yup. took the crank out and the balls are catching inside the bearing. I have been looking foward to running this motor for 2 weeks for this weekend and a BAD bearing. UNBELEIVABLE. I thought ITALIAN motors were SO HIGH quality.

What a joke
Return to sender,I say, excellent build quality,but use cheap bearings??
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Old 08-21-2010, 07:56 AM   #13
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it's been taken care of. I do agree that picco has really good quality stuff. Better then the o.s. i run. Just one of those things. Just sucks it happened ot me.
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Old 08-21-2010, 02:57 PM   #14
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Tough break dude but it can happen. Bearing manufacturers make millions of the things and a bad one is going to slip through every now and then. Glad to hear it's being taken care of for you.
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Old 08-21-2010, 03:23 PM   #15
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it's almost like when you tighten the flywheel, the outer edge of the crank is hitting/rubing on the outer cage on the rear bearing. I cannot describe how frustrating this is.
try a new collet first , sometimes an improperley angled collet/flywheel will pinch the bearings together and wear them out very very quickly

not all italian mills are the same
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