Timing- / cam-alignment, new CCT's, valves...

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MacV2
Posts: 13214
Joined: Sun Jan 21, 2007 12:07 pm
Location: Grain

Re: Timing- / cam-alignment, new CCT's, valves...

Post by MacV2 » Fri Sep 21, 2018 10:03 am

I've found some time in my busy schedule & created this...

https://www.vtr1000.org/phpBB3/viewtopi ... 31&t=42689
Lowering the tone since 2007...

vivec
Posts: 34
Joined: Wed Jul 25, 2012 10:05 am

Re: Timing- / cam-alignment, new CCT's, valves...

Post by vivec » Sat Sep 22, 2018 9:39 am

Did compression test on both cylinders.

- no plugs
- ice cold engine
- using starter motor for about 7 seconds
- throttle fully opened
- choke out

Rear cylinder gives 148psi, but the front only 120 :(.

Is there something that needs to 'settle' first?! Because it's kind of a dissapointment to be 28psi short of the rear.

Front one has been taken apart, rear one hasn't.
Replaced head gasket, exhaust valves and some shims to get them more into spec. Everything is torqued up to spec.

The manual states that 164psi for new and fully warmed up bike is the norm...

vivec
Posts: 34
Joined: Wed Jul 25, 2012 10:05 am

Re: Timing- / cam-alignment, new CCT's, valves...

Post by vivec » Sat Sep 22, 2018 10:50 am

I'm quite sure about valve seating and gasket fitting...
I'm wondering if I didn't put too thick shims on... that might cause the valves not closing properly.

Would / could this cause a 28psi difference?!

I know; look and you shall see... but asking here is just a bit quicker and easier before taking stuff apart again :wink:

vivec
Posts: 34
Joined: Wed Jul 25, 2012 10:05 am

Re: Timing- / cam-alignment, new CCT's, valves...

Post by vivec » Sat Sep 22, 2018 3:42 pm

Pulled the camcover off and found that 1 intake valve clearance is 0.09mm off (0.16 is prescribed and it's 0.07mm). That's a lot, but can that be a 28psi difference?!

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tony.mon
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Joined: Wed Jul 25, 2007 9:46 pm
Location: Norf Kent

Re: Timing- / cam-alignment, new CCT's, valves...

Post by tony.mon » Sun Sep 23, 2018 8:56 pm

You reground the valve seats, didn't you?
If so, they'll take a few miles to settle in their seats.
Check again in a couple of hundred miles.
And yes, you need to reshim, the tolerance is 13 to 19.
It's not falling off, it's an upgrade opportunity.

vivec
Posts: 34
Joined: Wed Jul 25, 2012 10:05 am

Re: Timing- / cam-alignment, new CCT's, valves...

Post by vivec » Mon Sep 24, 2018 8:53 am

yeah, reground and seated well (gasoline would not penetrate).
I'll order some exact shims from the stealer tomorrow. Hopefully that will increase the psi a fair bit already.

Fingers crossed!

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