Cam chain timing position 1150

[pomm001]

I have removed the LHS head to have a sheared off stud fixed up.
Before removing the engine was put at TDC firing on #LHS.
On putting it back together and fitting the cam sprocket and chain with the locating feature /slot of the sprocket and cam at 12 o clock
the arrow on the cam sprocket should align with the 'tooth' feature on the cam housing. ( 3 o clock)
But it doesnt exactly ( with the tensioner back in ) its very slightly past the notch, turning the sprocket one tooth back and checking again (with the tensioner in) makes it far to early.
To give an idea of the position, the correct position is 1/4 past the actual position is about 16 1/2 minutes past
On checking the opposite cylinder ( which hasnt been disturbed) the marks line up OK.
The bike has done 22 k miles and didnt have any chain noise that i had noticed, I have checked everything again, made sure that the sprocket locates to the cam correctly.
Does it need a new chain ?
Suggestions please from folks who know and have done this job a few times

thanks

 

[northengit]

Hi mate, just done exactly the same job on my 1150 twin spk, not to sure if everything is the same on each bike "ie timing marks/ arrows/reference points.. but this is what I done. Engine set at tdc locked in posistion through the g-box/clutch access hole with rod, cam cover r'mvd I marked my own marks in relation to the two arrows on out side of head,ie 3 and 9 oclock. What I did notice was on reassembly as you tighten the cam sprkt bolt the marks do appear slightly out.Did you cable tie the chain to the spkt ??. Either way before you start it..... both plugs out ,into top gear rotate the engine by turning the rear wheel and watch both sets of timing marks. Let us know how it goes.

 

[pomm001]

Thanks for that
yes i did cable tie the chain to the sprocket before i took it to bits,
when i first checked it and found it not to line up exactly i had only tighten the head up to its inital torque.
On fully torque and angle the alignment was much better, but not as definate as the RH cylinder.
Turned engine over a few times by hand and checked again with tensioner in and its as close as it can be.
With hindsight i should have checked this part of the alignment before I took it to bits.