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Old 07-17-2007, 08:49 PM   #1
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JP FX 21 R-03

Anyone know which nova rossi p/r/s/ kit will fit this motor?
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Old 07-18-2007, 07:00 AM   #2
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I think the novarossi R1 fits, after the JP case is nova based.
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Old 07-19-2007, 10:09 AM   #3
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any of the 321 will do
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Old 07-19-2007, 07:59 PM   #4
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Originally Posted by michael 1 View Post
any of the 321 will do
The jp fx R-03 engine is based on a novarossi rx321p only difrence from the later novarossi 321p engines is rear bearing size the jp fx R-03 has a 25.4x14x6 mm bearing and the later nova 321p engines used a 25.8x14x6mm rear main bearing. Outher than that there almost identical. I am not shore if the very latest jp fx R-03 engine uses the latest size bearing 25.8x14x6mm. If some one has a recsent production date jp r03 Please let me know. Regards Jeremy.
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Old 08-05-2007, 02:22 AM   #5
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hi sirio2127,

you're right, the new version of rx-03 is using the bearing 14x25.8x6 (part no. 16800). the crankcase and backplate are also different with the former version.

wm :-)
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