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Old 12-15-2005, 09:45 PM   #1
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Default Crank Question

I have a JP X12, when I took the engine apart I noticed that the bore thru the crank is the same size all the way thru it except for the end right where the counter weight is. It looks to be something in the casting of the crankshaft. The hole that the fuel comes thru gets smaller by about 1mm. Does this sound normal? If not can I smooth it out with a dremel? Anyone have any thoughts on this one?
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Old 12-15-2005, 10:22 PM   #2
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I have a JP X12, when I took the engine apart I noticed that the bore thru the crank is the same size all the way thru it except for the end right where the counter weight is. It looks to be something in the casting of the crankshaft. The hole that the fuel comes thru gets smaller by about 1mm. Does this sound normal? If not can I smooth it out with a dremel? Anyone have any thoughts on this one?
Can you take a picture, I don't think that's normal.
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Old 12-15-2005, 11:23 PM   #3
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it is absolutly normal-it is EFRA cranck. Main bore is 8 mm and to meet EFRA ruls they ade on exit 6.95 mm. If you are able to bore with dremel it will help on performance slightly, but make sure you don't touch cranck pin with dremel's bit-then it will be ruined.
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Old 12-16-2005, 05:28 AM   #4
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Can you take a picture, I don't think that's normal.

Not right now but at Christmas I can because that is one of the presents.
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Old 12-16-2005, 06:53 AM   #5
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Not right now but at Christmas I can because that is one of the presents.
Thats cheating Doc. Your not supposed to know what you're getting for Christmas.
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Old 12-16-2005, 08:52 AM   #6
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Thats cheating Doc. Your not supposed to know what you're getting for Christmas.

No it's one that I am giving to my wife. But it's like a community thing after that.
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Old 12-16-2005, 11:06 AM   #7
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No it's one that I am giving to my wife. But it's like a community thing after that.
Oh! Like the Playstation 2 that I got for my wife last year.
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Old 12-16-2005, 11:18 AM   #8
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Oh! Like the Playstation 2 that I got for my wife last year.



Yea like that but I think that she will use this alot more then me.

I can't play those game anymore. Give me a Atari game and joystick and let me at them. Woops showing my age again.
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Old 12-18-2005, 12:38 PM   #9
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I was hoping Grinder or Motorman would give their thoughts.
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Old 12-24-2005, 05:20 PM   #10
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Yep,, EFRA Crank. Kind of like a restrictor plate in Nascar.
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