Camshaft identification

So i got this 76 kz900 about 8 or 10 years ago. From a guy that couldnt ever get it running right so he bought a victory instead.
He told me it had a"performance cam"...i asked him "both?" And he looked kinda puzzled and said "yeah". So i just dismissed it . I got i home and replaced all the fluids and rebuilt the carbs and it fired up. Ive only put about 2k miles on it, because i usually zip around on the 650. So yesterday i pulled the valve cover to replace the leaking end plugs/gasket and check the valve clearance (all within spec). I should have taken more pictures, but when i was in there i was reminded of the guy telling me the cam had been replaced .. These pictures are rubbish, but can anyone tell me if they are stock cams?

Those are Yoshimura performance cams.
There should be other markings to denote what stage they are.

Looks like i gotta go have another peek at them for more markings. Should the valve clearances still be set to stock specs with these cams? My manual says .05-.1mm.
I put the air corrector jets in the stock vm26 carbs last night with 17.5pilots and 117.5 main (one above stock 115) uni pods and 4 into 1. Will the cams affect how it should be jetted? Its always had trouble idling untill warmed up for 5+min even with choke. I assumed it was the oil cooler making it take so long to warm up. Was close to removing the oil cooler , living in Maine and all and never getting stuck in traffic...lots of questions! any ideas? Ill go pop the valve cover back off in the meantime

Valve clearances should be 0.10mm to 0.15mm minimum with stock cams (.05 to .10 mm is the early Z1 spec and is too tight )
Always aim for the higher .15 mm figure but depending on those cams you may need to be wider as they can be ran at up to 0.20 mm.
You may need to go to 120 on the mains but your plug colour will tell you that.

Ok. Bummer about the clearances being wrong. Just took the valve cover back off. Got a couple more pics. Appear s to be a "B" stamped in the left end of the intake cam.. other than that i dont really see other unusual markings other than the popy. Idea?
Ill stay tuned while i start to play the shim swap game.

That B means it's a Yoshimura fast road /race cam which they used to call the Bonneville .
Same as their ST2 cam.

Thank you for identifying the cams, and for pointing out the correct valve clearance...and for the corrector air jets! They showed up in record time.
Im getting closer and closer to finally dialing this thing in.

I installed APE adjustable cam gears today. Still not positive what yosh cams i have here...a "B" marked on the left ends of the camshafts and maybe a roman numeral "1" next to the  "L"....any help?

My next question is what should I degree the centers to in order to realize the advantage of the cams? Im not looking for any crazy drastic improvement, just some improvement over stock while remaining reliable and safe. Im going on the assumption that the PO hasn't done any more than drop these cams in and close it back up .

thanks guys


     

What lift are they? That might narrow it down a bit. Here is a list of there old grinds with specs :



The "bonneville" should be .380" intake and .360" exhaust. If its not it may be one of the others on that list.

They were not great at marking the cams, I have some and other than the "POPY" there are no numbers on mine at all. Mine are for a 650 and I was told they were stage 2 (.400in/.380ex)

The stamped "B" is the only mark to be concerned about the rest are just casting codes etc.
As already advised they are Bonneville cams so either use the timing figures for those if you have them or set the lobe centers at 110 degrees if you don't.

The part #yk900-102-01 you reference here as the "Bonneville special" is the same part number zed1015 has posted stating "Bonneville race" both showing different stats....which one is it?
Thank you