z1 - compression low after wiseco kit rebuild?

@Old Man Rock
thanks for your response.

I'm going to pick up a set of adjustable cam gears and try to set the lobe centers to 105.

Just out of curiosity...
Based on my photos, I don't have the cams off 1 tooth do I?

Also, I'll try your jetting recommendation and tweak from there.

thanks,
-Ed

Hard to say in your images...

Maybe this will help... @ 1/4 TDC, lobe tips should aim as in right hand image to deck height...
Notice left image left intake cam off 1 tooth, slightly higher off decking...

@Old Man Rock
Take a look at this image.
What do you think?

Image is from a top view, get more down to the head decking height with your camera...
As far as I can in this image, left is high, right is lower than decking....

Rotate crank cw (forwad) 17mm crank nut under ignition plate.
Rotate where exhaust cam tip # 4 parallel to deck height.

You'll most likely find the 1/4TDC is not matched and intake came lobe is off as well...
Henceforth, not on the marks so to speak....

You can run @ 110 LC if you choose, just get them to align correctly at 1/4 TDC....

I was reading what jetting Old Man Rock was running in his CR29's with air filters. There must be a big different in jetting when you run air filters over velocity stacks on CR's. I have always run CR33's on all my KZ motors with the long velocity stacks. My elevation was only 400 feet I think back in the Chicagoland area.

I ended up with a 62 slow jet, YY7 needle on 4th notch,120 or 122 main jet, but only a 180 or 190 air correction jet. If I ran a air correction jet of that size 230/250, it would never drop down to its idle speed. Plus if you backed off at high RPM's it would just coast, no real engine brake. With the 190 air correction jets when you revved the motor it would instantly drop back to its idle speed, and tons of engine brake when you backed off!! Could running air filters change the jetting that much.

I ran 1015 or 1105 motors with about 12 to 1 actual compression. Cams were either Yoshimura Super Bonnevilles(.400 lift 275 duration) or Norris 440sc's(.440 lift 282 duration) Yoshimura ported heads with 37.5 intakes.

I know out here in AZ I will have to run air filters because of all the dust. Its like living on the back straight at Eldora during a World Of Outlaw feature!!!

Okay.
I'm thinking my cam timing is off.
I'll verify when I get home.
Like I said earlier... the bike seems to run pretty damn good.
And it's pretty darn fast.

Lets say my intake cam is retarded 1 tooth.
Would there be any potential engine damage from this?
Keep in mind I just did a 3000 mile trip.

I took photos of where the cams were situated when I initially disassembled the engine.
And I just put the new cams in as the old cams were.
I wonder if the cams were off when I got the bike.
Like I said... it was a junker.

Thank you again for all your responses.

-Ed

@Dr. Gamma

Thanks for your input about your jetting specs.
Aside from cam timing... I'm going to try and make some needle / jet adjustments based on your feedback and OMR feedback.

-Ed

emy111 wrote: Lets say my intake cam is retarded 1 tooth.
Would there be any potential engine damage from this?
Keep in mind I just did a 3000 mile trip.
-Ed

Nope not if it is running good like you say. If you had bent a valve you would notice it. Recheck your timing marks again. Good luck and you have one good looking KZ there to be proud of.

Hey guys,

I got home from work and pulled the valve cover off.

First image is where the lobes fell since my rebuild and during my long trip.

I rotated both the intake and exhaust cam 1 tooth advanced as seen in the second pic.
They look like they line up better now. Lining up directly at the T mark.
What do you guys think?

I went for a ride and the bike seems a bit faster now.
Seems to idle better too.
Compression also jumped from 125 to 175ish.
I increased my main jet from 110 to 115. It feels good.

I still plan to do adjustable cam gears and actually set lobe centers to 105, but until I do that... do the cams look like they're lining up more closely to how they should be?

Let me know what you guys think.
Thanks.

-Ed

Before


After

Did you replace the cam chain - it looks like a stock cam chain in the picture? If not, how many miles were on it?

The stretch (wear) can confuse as you'll end up with the cams mildly retarded or off a tooth if you are not careful.

@jeff
I did not replace the cam chain. I would guess there are 15k miles on it.
-Ed

If second image at 1/4 TDC mark and @ 28 tooth count then spot on in the alignment!
Damn, looks 100% exactly like my first OFF Lobe center image with that build.... :laugh: :laugh: :laugh:

Now, you can leave it @ 110 lobe centers if you choose, probably save you some $$$ and a whole lot of headache not having to deal with CAM Degreeing... Pending your riding style, desired power band range (low, mid or WOT throttle), idle conditions or desire just to learn.



Also, possibly I missed it but was the head ported as well... If the old girl hauls ass as is after this timing adjustment, get your carb jetting correct and go for a ride.... If she purrs like a kitten at idle, pulls like a rape ape for ya, then shit leave it for now and enjoy your ride. You can always go the adjustable cams later on if you choose...