Topic: CB750 crank

[chris]

Has anyone worked out how to repair damaged primary driver gears on the crank.Also is it true that a CB 750 or 900 DOHC crank will go straight into the SOHC crankcase Thanks Chris

[vfourfreak]

Sorry Chris but I can't answer your first question, but the answer to your second can be found in the "ultimate motor" thread http://forums.sohc4.net/index.php?topic=32541.0 , check lordmoonpie's CR750 build there.  I don't think "Straight in" is the best term, but it can be done.

Kev

[jweeks]

Chris,
     Generally not worth trying to repair a crank gear as replacement crank costs are so little. (Race cranks are an exception) The DOHC Honda cranks are covered in topic "A Bike Is Born....750/1000cc".  Some minor clearancing is required as the topic photos show.

                                                            Jon Weeks

[chris]

Thanks John where will I find that ?

[chris]

Sorry what a dummy I am just found it right in front of me

[lordmoonpie]

Sorry Chris but I can't answer your first question, but the answer to your second can be found in the "ultimate motor" thread http://forums.sohc4.net/index.php?topic=32541.0 , check lordmoonpie's CR750 build there.  I don't think "Straight in" is the best term, but it can be done.

Kev

It wasn't easy that's for sure and with the scarcity of the hy-vo primary chains, I'd seriously look at a 750-automatic crank, You get the benefit of the hy-vo cam chain and none of the hassles of the hy-vo primary sourcing as you can use standard chains. It's all possible though - just depends how much engineering you want to do and how much $$$ you have ;-)

I'm still developing the DOHC 750 crank solution. It's worked well enough so far but changing ignition has proven difficult as all commercial SOHC solutions relay on an SOHC crank of course and don't have the splined crank end of the DOHC crank....I'm getting around it though slowly...