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Old 01-22-2010, 02:03 PM   #1
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Default Help please : Bearing replacement on JPX.21

What is the easiest and best way to replace front and rear bearings on the Jammin JPX .21???
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Old 01-22-2010, 02:07 PM   #2
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remove everything from the engine put it in the oven set to 400 wait 15 to 20mins and very lightly tap the case on a piece of lumber i use a six inch piece of quarter round drop right out hope this helps
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Old 01-22-2010, 02:15 PM   #3
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Thats what I did, but how do you get the new ones in?
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Old 01-22-2010, 02:17 PM   #4
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I place the new bearing in the freezer 30 minutes prior so it will shrink enough to go in easy.
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Old 01-22-2010, 02:18 PM   #5
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reheat the case they should drop right in Ive also heard you can put the bearing in the freezer while the engine is heating up then put the cold bearings in the hot case never had to do hope this helps
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Old 01-22-2010, 02:20 PM   #6
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mthird beat me to it
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Old 01-22-2010, 06:29 PM   #7
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You must have the bearing on the crank to keep it straight while installing the rear bearing.

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Old 01-22-2010, 07:05 PM   #8
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Thank's 22racer, that I didn't know, So that's how I screwed up my first crankcase.
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