Won't rev over 5000 rpm

[tony.mon]

I have spare std airboxes if you need one.

[sirch345]

Good to hear the outcome, well I hope for your sake when you test ride it, it is that.

Thanks for getting back to us,

Chris.

[Thetoaddude]

Is there a suicidal emoji?

Air box is OK for now. Good old Araldite. I can pick up a spare from the bay of e sometime.

I ran the bike with the carbs fitted properly with no improvement so I've returned the rear cylinder cams to their original position- still no better.

Assuming the carbs will now be way out of balance I've got the balancer out. Now, I confess I'm out of my comfort zone here, but while both are tolerably in balance, the vacuum is 180mm which on my gauges is in a red zone saying "Late valve timing or leak at intake manifold". After yesterday's revelation I'm pretty happy there is no leak at the manifolds. Could this be a symptom of something more serious?

[Wicky]

After all the fettling with cams - is the valve timing 1-tooth or so out?

[VTRDark]

Have you checked the petcock diaphragm as Hawk suggested. Then there's the pulse generator behind the clutch cover. It's rare for these to fail but it has been known. But the petcock diaphragm is a fairly common failure.

[Thetoaddude]

Yes, I checked the fuel tap diaphragm. I shone a bright light behind it ( well, my Mrs did) and couldn't see any holes either side.
How do we check our pulse generators then?

[VTRDark]

Multimeter.

Instructions in the workshop manual.
http://www.vtr1000.org/phpBB3/viewtopic ... 31&t=18025

[sirch345]

I ran the bike with the carbs fitted properly with no improvement so I've returned the rear cylinder cams to their original position- still no better.

You've lost me here, can you explain in a little more detail exactly what you mean by the original position Valve timing is either right or wrong, there is no in between if the bike is to run right,

Chris.

[Thetoaddude]

The original position is where they were when I bought the bike. As per directions earlier in this thread I had removed the rear cams, rotated the crank 1 turn and replaced the cams in the TDC position in an attempt to cure the "180 degree out" issue. Unfortunately no joy so I've returned everything back to where it was in the first place.

[sirch345]

The original position is where they were when I bought the bike. As per directions earlier in this thread I had removed the rear cams, rotated the crank 1 turn and replaced the cams in the TDC position in an attempt to cure the "180 degree out" issue. Unfortunately no joy so I've returned everything back to where it was in the first place.

Not meaning to sound rude, but you don't really know if the valve timing is set right now, or 180 degrees out going by what you've said above.

My advice would be to follow either Cybercarl's instructions on setting the valve timing for manual CCT's, or mine for renewing CCT's and go from there.

Cybercarls link:- http://www.vtr1000.org/phpBB3/viewtopic ... 31&t=28583

My link :- http://www.vtr1000.org/phpBB3/viewtopic.php?f=31&t=8326

Chris.

[VTRDark]

Chris he's put them back to as they where before. I got him to to spin the timing thinking this wont rev over 5000 rpm issue was 180 out with 5000 being a typical symptom of this. There was no change so they are back as they where now. If it was 180 it would have a been a very noticeable difference while riding. Fuel system has been checked so we are now onto Electrical. Pulse generator, ECU/ICM.

[sirch345]

Chris he's put them back to as they where before. I got him to to spin the timing thinking this wont rev over 5000 rpm issue was 180 out with 5000 being a typical symptom of this. There was no change so they are back as they where now. If it was 180 it would have a been a very noticeable difference while riding. Fuel system has been checked so we are now onto Electrical. Pulse generator, ECU/ICM.

While I agree with what you are saying Carl, it doesn't alter the fact that Thetoaddude should have checked all settings (flywheel marks RT & FT, cam sprocket marks RI & RE) plus making sure the cylinder he's working on is on TDC and the cams are facing in the right direction as you know, [b]noting[/b] front and rear cylinder cam lobes face in different directions. As it is atm it seems the decision on putting the valve timing back to where it was when he got the bike means it's now right. To me that is the wrong way to go about it, you need to check out the settings so you know 100% the valve timing is set correctly, only my opinion,


Chris.

[Varastorm]

The original position is where they were when I bought the bike. As per directions earlier in this thread I had removed the rear cams, rotated the crank 1 turn and replaced the cams in the TDC position in an attempt to cure the "180 degree out" issue. Unfortunately no joy so I've returned everything back to where it was in the first place.

I might be wrong here, but this smells a little like someone's not telling the truth, as there is no way both ways will work the same.

I reckon you never opened her up at all & demand to see photo's if you have

[Thetoaddude]

You're right, it's possible I may have nothing better to do than make up my workshop antics, however life's too short and I JUST WANT MY BIKE TO WORK!!!!!!
I believe that I've followed Cybercarls instructions on checking the timing to the letter in the first place and there's no indication of anything wrong.

I do appreciate everyone's efforts to help though. I'll keep you posted.

[AMCQ46]

if you need bits to swap out then I am not to far away from you and can take a look / listen