Cam Swap '80 750CBF SS

[Cemoto]

Hi Guys - Happy New Year everyone.

After reading where it is a somewhat easy swap, I think I'll do it during the down time this winter.

  So what am I up against please?  Other than the cams themselves ( and gaskets, of course) are there any other parts needed? a pretty much, bolt on job? need to make any timing changes, etc? I don't expect a huge difference, but every little bit helps.

I've already installed a Yoshi 4-1. I like the idea of running something a little older and meaner ( a lot like myself :-))  While I'm stopped, lots of people come up and ask about the bike.  

Thank you.

[OTTODOCTOR]

The 900 cams are a great upgrade from the stock 750 cams . The big improvement is in the 3000 to 8000 rpm range , and it will pull better to the rpm limit as well . Starts running out of steam above 10000 , but you're not supposed to be there anyway . -- As far as problems with the install go , it's really a simple job for anybody with mechanical abilities . -- Set timing like the manual says to , and be sure to use the cam gears that go with the cam chains you intend to use . Be sure to set the valve clearance as well . -- Like I've said before , it goes from yup , it's a a 750 , to OOOOHHHH YEAAAHHH , now THAT'S a 750 . -- Your exhaust upgrade will do a bit better than the stocker as well , so sit back and FEEL the power . -- You will NOT be disappointed .

[Cemoto]

Hey! - Thanks for the reply.  

I was curious though, other than the cams what else would I need to change?

1. Can I use the same cam chain that is installed now?
2. Do I use the same cam gears from my present cam? do they just bolt on to the "new" 900 cam?
3. Ignition timing stays the same, right?
4. Valve lash set for 750 or 900?

BTW, I plan on doing the Dynajet kit at the same time, hoping to eliminate hard starting when cold.

THANK YOU!

[pickandpray]

nothing to change except maybe shims to get her back in spec afterward.  shoot for .005mm on the valve clearance

I've heard you should keep the existing cam gear and swap only the cam.  For my bike I swapped the exhaust cam gear and kept my cam gear on the intake.  They looked fairly similiar in wear patterns so I thought it should be ok.

you may need new  VC gasket and grommets if your existing ones are original.

I just finished my install. Still need to find a small torque wrench for the cam bolts.  only had to buy 3 shims to bring her back to spec.

The swap should only take about 3 or 4 hours... I'm taking it slow and it's already 3 weekends, but I'm not really working continuosly.

Chi
1980 cb750c with 900 cams

[Cemoto]

Thank you - hello Ebay?

Regards,

[woodsrider250-2]

Keep your stock airbox, and jets.  Well, richening the primary main from a 68 to 72 will help a lot, but had nothing to do with starting.  If your bike has the vacuum-operated safety petcock, that's generally what makes starting hard.

[Cemoto]

OK - Thanks!