Z1OwnersClub GB

hi chaps,
just thought id draw on your z knowledge.

Oh dear.... that'll be some new valves then...

This might be usefull.

http://www.z1ownersclub.co.uk/forum/vie ... hp?t=10208

Sounds like you're 180 degrees out on the timing.
redo it and make absolutely sure that piston No1 is at TDC on it's compression stroke, (finger over the hole to chek as you turn the crankshaft)

If you're lucky you won't have damaged any valves but if it starts check your compression anyway to be sure.

Sounds like bent valves to me as you wouldn't be able to hold the chain in tension with your finger, I hope I'm wrong.

hope its not bent valves,but it certenly sounds like it.

twiddle tomorrow and let you guys know
cheers

Well, ordinarily, 'especially with being a mechanic and seeing various things in the past' that'd be my first conclusion, (what is it about mechanically minded people, why do we all seem to be pessimists?)
However having read and contributed to the recent 'zero compression Z1000 thread' referenced by Steve R above you might, 'fingers crossed for you' get away with it.
As I said, redo the timing, chances are it's 180 degrees out, very common and easy to do and see what happens, a compression test will tell you immediately if you're low on one or more cylinders, if so, head off inspect and renew valves unfortunately.

Hope it's the easy one, good luck with that

One thing to add, again from experience.

After an engine or top end rebuild ALWAYS turn the engine two full revolutions by hand using the crankshaft bolt, not the kickstarter or button.
You'll know if things aren't right and valve strike at hand crank speed won't hurt.

hi, so how does it become 180 degrees out when the bottom mark is lined up to T and pistons 1 & 4 and both cams are lined up with the head as they should be ?

Didnt dreadmanbastard have a similar prob used the wrong T mark under bike help zero compression

is it possible mine has been timed from pistons 2 & 3 at TDC. ive been lining the cams to 1 & 4

steve bowdler wrote:Didnt dreadmanbastard have a similar prob used the wrong T mark

if you didn't retime it I'd say not. Sorry to be the bearer of possible bad news but it sounds like it has slipped like bigmac103's did.

Check the valve clearances - if any are very big then you've bent some valves and the head will have to come off.

the advice about turning over by hand at least twice is good.

best of luck.

ive had another twiddle today and its not looking good. i checked that pistons 1 & 4 were at the top with the plugs out and the camshafts were lined up with the arrow marks facing front for ex cam and rear for inlet cam and the TDC for 1 & 4 was lined up at the bottom but still no compression and it turns over twice as quick.
does anyone have a photo of what position the cam lobes should be in when timed up correct ?
i cant see how the valves could be bent just from using the kickstart when it locked up.

look at this diagram. Also have you checked the clearances since you turned it over. It really does not take a lot to bend a valve or two......