Racing my 650 hot street bike

yes

i had to slot my sprockets for my megacycle cams it said warning" will not drop in on stock marks"

i think the stock 650 have differents lobe centers angles for intake and exhaust, so stock sprockets are set for that

kawi810 wrote: i had to slot my sprockets for my megacycle cams it said warning" will not drop in on stock marks"

Won't be doing it for a while but did you use a dremel for the slots..... seems like you get em off by .005 awful easy and have a wobble (tight and loose spot)?? Have read that folks have been doing it this way though for quite q while.....

Can't wait to see your improved lap times Leitz.

Kz650 Clymer manual: 105 intake and 110 exhaust lobe centers

kawi810, 650 is not hyvo, so has indeed the sprocket to push on the chain tight without the cover , on 750 you set the IN off by 4 degs and then cover brings the cam into the right degreeing
Leitz,
leave alone stock timing, you want a better performing engine than stock no?

105-105 is a common good setup for kz motors.

dont have time to do the cam slotting or too lazy? run whatever you have there but please dont complain to us if the valves kiss the piston or each other later to me 116 in-108ex sounds like an odd combination that will kill midrange

we are only trying to help

have great weekend!

I will not turn the engine with 116-108 i go for 105-105 by slotting but at first i´ll test dropping avanced one pinion the intake sprocket on the cam chain. Probably I'll be closer to the 105 before slotting the sprockets holes
kawi810 wrote:
i had to slot my sprockets for my megacycle cams it said warning" will not drop in on stock marks"
Thanks all for help!!

was not sure what year 650 you had 81,82,83 use the hyvo same as 750 's . i slotted mine on a mill .and i use a cut up cover to make sure every thing is spot on .

s1164.photobucket .

com/user/kawi810/slideshow/

Kawi810: 1978 so not hivo

Andrews seller has wrote me this info:
"You may best use 105-107 intake but I think 110 is too much. They may time them that late because of piston to valve. You have to have at least 1.5MM clearance between intake and flycut on the piston dome. You will have to machine the cam sprockets to adjust the timing."
May be 105 deggrees dangerous for stock pistons? i have no time now for opening the engine for checking
I am searching a machine shop to get the sprockets slotted

checking the vale to piston clearance is normal practice when you fit high lift cams.

best is by opening the motor and putting Plasticine in the valve pockets, closing the motor and turning the motor over, then checking how much gap you have

if your valve springs are stock, you might be able to do it by pressing on the bucket and see how much more they can move till they touch the piston, not easy, usually its done by installing a weaker spring. see page 11 here
www.lunadesign.org/images/gixxer/Slabside-Hop-Up-Manual.pdf

there's a third method of using a 1.6mm solder wire, pushing it all the way down to the edge of the valve pocket, turning the engine and pulling the wire. if it comes out at the point where the valve and piston are closest, the you are fine, again not that easy or reliable check.
i believe that if you didnt increase compression youll be fine with an extra mm of lift, but cant be sure 100% all cams are different.
my gpz didnt need machining the pockets for more clearance as it has a wiseco kit with deep pocekts, but my CB500/4 needed machining whit high lift cam on stock pistons, really hard to say.
honestly was sure you knew that this is an important check with performance cams,

if i was you, would stay clam, run your current cams and do the check properly opening the motor after your next race.