[marcoma]

Can anyone tell me if its possible to fit the cam sprockets rotated 180 degrees?

I know how they're supposed to fit (with the #1 cyl lobes upwards at TDC) but I got a bike in that someone had "rebuilt" which has a strong spark and fuel coming out of the injectors but will not run. I was wondering if the timing was 180 degrees out?

Thoughts?

 

[8Ball]

If the cams were installed 180 degrees off the crank would be 360 degrees out and you’d be right back to where you started.

If the cams were installed 180 degrees of crank shaft rotation out, then you’d have a bunch of bent valves the first time you tried to start it.

If one cam was180 degrees out from the other, bent valves again.

 

[Panici]

Can anyone tell me if its possible to fit the cam sprockets rotated 180 degrees?

I know how they're supposed to fit (with the #1 cyl lobes upwards at TDC) but I got a bike in that someone had "rebuilt" which has a strong spark and fuel coming out of the injectors but will not run. I was wondering if the timing was 180 degrees out?

Thoughts?

Run a compression / leakdown test.

 

[marcoma]

Compression is good.

Is there any way to check if the ignition timing is off? I've turned it over repeatedly and only got a backfire out of it which suggests the spark is not happening at the correct time. This bike had a pretty major crash at the track and has not run since. The PO rebuilt the motor but I worry about his competency after seeing some other serious fubars on the bike....
As previously stated - I have both spark and fuel. Its a 2008 year model. I have 2 other 2006 year model R6's but as you all know, the 08 has the second set of injectors so I can't swap the ecu to check it.

 

[marcoma]

Ok so I tore it down and the cam timing was out by a mile. I reset it all but noticed that when the cct was installed the exhaust cam was off slightly. The timing mark was slightly above the edge of the head (see pic). But the inlet and the tdc indicator on the crank were spot on. I tried moving it forward a tooth and it was way too low.
Any thoughts?

 

[Panici]

Chain stretched / tensioner no good?

Or it might be fine, maybe the chain is slacked in the wrong direction as it hasn't been driven by the engine yet after you adjusted.

 

[marcoma]

Chain stretched / tensioner no good?
Or it might be fine, maybe the chain is slacked in the wrong direction as it hasn't been driven by the engine yet after you adjusted.

Tensioner is tight (its a manual APE), motor rotated several times (I always turn it over by hand a few times to check interference)
I'm going to replace the chain for good measure.

 

[Panici]

Okay, let us know if that does the trick.

 

[marcoma]

Something I noticed was that in the cam sprocket positions above, the cam lobes at the rear of the motor (#1 cyl) do not appear to be symmetrical so I'm gonna assume that the lower position of the exhaust sprocket is correct and that the chain has stretched enough to cause it to rotate further than normal. New cam chain ordered!

 

[8Ball]

Your cam sprockets appear to be slotted, indicating that the cam advancement is intentional.

Pull one intake cam sprocket bolt and see if it is slotted

 

[marcoma]

Your cam sprockets appear to be slotted, indicating that the cam advancement is intentional.

Pull one intake cam sprocket bolt and see if it is slotted

I wish. They are not slotted. I've set adjustable cam sprockets on my race bike - its pain in the rump on these motors....!

 

[marcoma]

Here’s the cam lobes. Bad pic I know cos the frame is in the way but you can see the left one (exhaust) is higher than the right (inlet)

 

[marcoma]

Timing is now spot on. Compression is good. We have a spark. There is fuel pressure. But still won’t run.
is there a way to check if the injectors are firing and delivering fuel?
I’m waiting on a spare ecu to try but does anyone have any other suggestions?

 

[Panici]

Timing is now spot on. Compression is good. We have a spark. There is fuel pressure. But still won’t run.
is there a way to check if the injectors are firing and delivering fuel?
I’m waiting on a spare ecu to try but does anyone have any other suggestions?

Injectors must not be firing if you have everything else.

Can try spraying some brake cleaner / ether into the intake while you crank to see if it'll start the bike. But this does come with some risk.

 

[marcoma]

Injectors must not be firing if you have everything else.

Can try spraying some brake cleaner / ether into the intake while you crank to see if it'll start the bike. But this does come with some risk.

I can look down the intakes with the throttle wide open and see the injectors working as I crank it.

it’s backfiring through the inlets which means the spark is happening at the wrong time. The cam timing is set per the manual to match the crank. I just don’t understand why or how it can fire off sync….

 

[marcoma]

Tried a different ECU and no luck. Think I’m gonna swap the wiring harness next.

 

[Panici]

Have you swapped out cam/crank sensors?

 

[marcoma]

Have you swapped out cam/crank sensors?

Not yet but thats not a bad idea....

I noticed in the area near the crank sensor (see pic above) theres some previously repaired crash damage. Maybe that hit was hard enough to damage the sensor too?

 

[Panici]

Not yet but thats not a bad idea....

I noticed in the area near the crank sensor (see pic above) theres some previously repaired crash damage. Maybe that hit was hard enough to damage the sensor too?

I'd try the sensors before a new harness.

 

[marcoma]

I'd try the sensors before a new harness.

Absolutely.

I'm wondering if theres a way to check the sensors using a multimeter and a magnet? I'll go take a look on youtube to see if theres anything...