Anyone had the valve timing jump ?

[ktmmark]

Working on an 1150 rt and has low vacume and compression. From what i have found it looks like the timing chain has jumped behind the front cover.
The bike has been a police bike (owner did not know)
speedo has 12,000 on the clock o2 reg
Has anyone had this happen

 

[ciderman gs]

i have read on here that it has happened but i think it is very rare if the problem is on the right cylinder (looking from the front) then the reason could be the lazy tensioner that has since been updated as in lazy when cold and v/lazy when hot which would let the chain go slack and could jump a tooth but you probably already know this

 

[littleredrooster]

Working on an 1150 rt and has low vacume and compression. From what i have found it looks like the timing chain has jumped behind the front cover.
The bike has been a police bike (owner did not know)
speedo has 12,000 on the clock o2 reg
Has anyone had this happen

....the timing chain is not behind the front cover, that is the alternator belt.

There are two timing (or cam-) chains, one for each cylinder, both within the cylinder castings. Ciderman's idea is a possibility; if the tensioner is shagged, it may have jumped a tooth or two.

 

[Hong Kong Nick]

Sorry to change the subject slightly ... but an 02 police bike with only 12,000 km on the clock? Where I work (ahem ... ) there are plenty of police bikes (R850RT) parked downstairs and the newest one is an '03 with more than 170,000 km on the clock!

And that from a place with a very limited road network

Nick

 

[Stewart H]

From reading the manual there are three chains in there too, the front one and one per cylinder it ought to be easy enough to check the indexing
Stewart

 

[ktmmark]

It's the front chain i think has jumped, behind the front (alloy) cover when i line ot in the window the arrows on the cam sprockets are not horizontal by half a tooth (which will be one tooth on the front sprocket)
Going to talk to the customer today to ask if he wants me to go further.
Came in for cutting out when low rpm,
As for the 12,000 i also think not
The odd thing is, it has a calibrated speedo from nott's but he said it's from Irland and has a Irish plate,

 

[MattW]

....the timing chain is not behind the front cover, that is the alternator belt.

There are two timing (or cam-) chains, one for each cylinder, both within the cylinder castings. Ciderman's idea is a possibility; if the tensioner is shagged, it may have jumped a tooth or two.

As Mark says, there are three timing chains if you count the crank to jackshaft chain (behind the front cover )

 

[Rob Farmer]

The odd thing is, it has a calibrated speedo from nott's but he said it's from Irland and has a Irish plate,

IS it Notts Police or just from Nottingham? Instrument repair service provide calibrated instruments for various Police forces --> http://www.irs-gb.com/speedometers.ihtml

 

[littleredrooster]

As Mark says, there are three timing chains if you count the crank to jackshaft chain (behind the front cover )

Ahhh.....that front cover.

Don't overlook the bleedin' obvious, rooster.

 

[Steptoe]

From what i have found it looks like the timing chain has jumped behind the front cover.
:

Lets start at the beginnning - what have you found that leads you to the conclusion that the chain has jumped on the sprocket.

 

[ktmmark]

I have low vacuum and low compression 110 psi
Ignition timing ok but fires back through inlets
If I align cam timing marks crank is out and front cover has been off by the looks of the sealed round it

 

[ktmmark]

Got go ahead to strip it further and found it had been timed wrong
The left cylinder was set as the right and the right as the left so after re seting the timing
it has 170 psi compression and runs like shit
Everything has been set to get it to run as it was, so need to get it back to normal