62mm stroke crank

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carlos fandango
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Tue Jul 14, 2009 7:34 pm

I was going to get an rb250 but now im worried about the reliability of the kits, re. the exhaust bridges being the same as the rb225.
So i have plan B, involving a 62mm crank. ;)
Does the crankcase need any mod. to fit a 62mm? I think ive heard about it needing a clearance groove machining in the crankcase for the con rod big end ? if so what size?
Thanks Russell
When i was young my Mom said "if you haven't got anything nice to say, say nothing at all " ..................... and people wonder why I'm quiet around them !

ricalnic
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Tue Jul 14, 2009 8:03 pm

CF I think it is only the RB22 that has the additional exhaust ports. RB20 and 25 have single port.

rgds

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drunkmunkey6969
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Tue Jul 14, 2009 8:52 pm

ricalnic wrote:CF I think it is only the RB22 that has the additional exhaust ports. RB20 and 25 have single port.

rgds

Only RB20 has single port, RB20 & 25 have bridges.

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drunkmunkey6969
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Tue Jul 14, 2009 8:54 pm


ricalnic
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Tue Jul 14, 2009 9:49 pm

I stand corrected, sorry. tks DM

DJ 240
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Wed Jul 15, 2009 6:22 am

HI yes you do have to mill out engine casing I am just building mine now, but dont go to mad because the casing becomes thin ?
my mate Vinnie has this set up with a few more mods and it is a quick bike very Iam using a long rod in mine as suggested to me
buy Dave Webster

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