HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
dougie-yzf

yz450f 08 can slip

4 posts in this topic

Asked to moto mechanics in town yesterday about the tdc mark they both said the T on its side is this right? my intake cam has slipped in the bearing therefore when I line the marks up my intake lobe is at 12 0'clock dont think thats right and my exhaust is on 7 0'clock where its suppose to be any way. So last night I lined it up with the T and ignored the marks set my lobes at int at 2 and exhaust at 7 started up 1min tink! Don't know what happen but something broke don't know did I do something wrong I've had this bike apart 8 times since I bought I'm starting to give up.

Share this post


Link to post
Share on other sites

There is no "T on its side" anywhere.  On the flywheel, there are 3 radial lines near TDC.  The first two from left to right are connected with a crossbar to resemble an "H".  Those are for ignition strobe checks.  The remaining line is TDC.  If in doubt, remove the spark plug and check for Top Dead Center with a long narrow screwdriver blade.

 

The cams are then set up as shown below:

 

If the cam chain has ANY tight spots in it, replace it and buy a new tensioner, before you wipe out $1000 worth of cylinder head, or worse.

marks.png

Share this post


Link to post
Share on other sites

I thought it was the mark after the "H" because I used the screwdriver trick last time and it started first kick. Can you do the timing by just going off the lobes on the can because decompression side looks like it seized and spun out.

When I line it up like you have shown

On your pic my lobes dont look right

The decompression side sits at 12 O'Clock and intake sits on 7 o'clock

Thanks for the info

Share this post


Link to post
Share on other sites

In that case, the cams need to be replaced, and there is probably some damage to be repaired in the cam bores on the head.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0