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post #1 of 18 Old 05-19-2012, 05:12 AM Thread Starter
 
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Stroker

Long time I have been here!

Trying to find out the xx conrod spec vs the xr650r, trying to know if I can build a short rod stroker. Hotrods seems to be unvailable yet, I ordered it in december.....

Also maybe I can find another brand conrod to fit, the goal is to keep stock wrist pin location.

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post #2 of 18 Old 05-19-2012, 04:41 PM
 
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Quote:
Originally Posted by Brokenbones View Post
Long time I have been here!

Trying to find out the xx conrod spec vs the xr650r, trying to know if I can build a short rod stroker. Hotrods seems to be unvailable yet, I ordered it in december.....

Also maybe I can find another brand conrod to fit, the goal is to keep stock wrist pin location.
The XR650r conrod is smaller big end bearing, smaller little end bearing and alot longer than the xx conrod eye to eye. I have the specs somewhere. Just can't find them at the moment.
I contacted Falicon and they said it would be a custom built rod or you may need to build a spacer plate for the cylinder.

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post #3 of 18 Old 09-23-2012, 06:40 AM Thread Starter
 
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I just got the 3mm stroker crank!!!! Anyone know how this would affect the compression ratio.

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post #4 of 18 Old 09-23-2012, 06:45 AM
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i dont know how it will effect the comp ,is it an hot rod crank?


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post #5 of 18 Old 09-23-2012, 07:11 PM
 
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I just got the 3mm stroker crank!!!! Anyone know how this would affect the compression ratio.
Who built it and where can I get one ?

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post #6 of 18 Old 09-25-2012, 12:29 PM
 
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you can get strokers built from several they just are not cheap if you did a 3 mil stroke you could run that with a .060 base stack up and a oe length rod or run a 4 mil with a offset piston and a larger base stack

generally looking at about a grand for a new rod/bearings stroke and balance + piston if needed

broke you would have to do the math but i would guess a half point ish nothing major

the longer the better on the rod imo as long as it fits and you dont lose skirt coverage


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post #7 of 18 Old 09-25-2012, 07:36 PM
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i had a crankworks 350x stroker that absolutely RIPPED. they pressed the rod and smooshed it to fit with no spacer plate. maybe they could do the same with XX?

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post #8 of 18 Old 09-26-2012, 09:30 AM
 
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when you stroke it you have to make it up some place either a shorter rod, or longer rod or same size with the cylinder spaced up. off set piston etc there is a bunch of ways to do it. if you have 84mm of travel and you change it to 88 90 etc its going to move an extra 2-3mm down and 2-3mm up.

there needs to be clearence in the cases for the rod end to travel, the piston needs to withhold its skirt coverage from coming down further and you need room up top so it dont wack the head

when you start adding stroke with a shorter rod you start changing the rod angle as well which is when the piston travels to bdc the rod will be more horizontal the further you go. this adds to the side load of skirt pressure which creates drag.


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post #9 of 18 Old 09-27-2012, 07:39 PM
 
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post #10 of 18 Old 09-27-2012, 09:29 PM
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sweet stuff man. i like!


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