Re: 750 DOHC question

Posted by d9canada on
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/750-DOHC-question-tp4058610p4058645.html

Yes the cam swap is worthwhile to get rid of the flat midrange that is common to all the vintage Hondas. 

You don't have to rejet or anything, just be sure when you swap the cams into place that you don't drop anything into the bottom of the motor, and make sure you time the cams as noted in the FSM. 

Once you have the cams in place, pull the plugs out, leave the ignition off and turn the motor over by hand with a wrench on the rotor center bolt.  Turn it clockwise a couple revs and then check the cam timing marks again.  You may find it's slipped. 

This is usually because the A chain can get an extra couple of links caught up on the crank gear with all the fooling around.  You pull up on the chain and figure it's tight but as I say, it may have trapped a few links.  So double checking it can really make a difference before you get it all bolted into the bike.  Don't forget to adjust the cam chain tensioners and check the valves too.  Then, if it runs OK and the carbs are clean & working well, you can go on and do the vacuum carb sync.

On Thu, Sep 24, 2015 at 7:32 AM, Truck [via Honda CB750'S] <[hidden email]> wrote:

I'm planning the same build. Didn't think of a cam swap though, does it make a noticeable difference?

It's only illegal if you get caught.

If at first you don't succeed, use more lighter fluid

95% of Harley Davidsons ever made are still on the road... The other 5% made it home.

New Baltimore, Va '82 CB900c, 1980 CB985F/K 'Mutt"

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