TDC on the rear cylinder? - SV650.org

5hort5 · 31-12-09, 05:50 PM

when turning the crank to get tdc on the rear cylinder should the mark in the inspection window be an R or an F? On mine it's an F is that normal? The C and D are the right way up and the arrows are in the right place but i would have thought R stands for Rear, is that not correct?

thanks si

5hort5 · 31-12-09, 06:08 PM

anyone about that knows - I could do with getting the valve cover back on but want to make sure I have down the clearances correctly first.

31-12-09, 06:13 PM

Yeah, TDC for rear cyl is on the R

jambo · 31-12-09, 06:30 PM

TDC for the Rear cylinder is "R" on the timing inspection cover. HOWEVER, all timing markers for lining up the cams for both front AND rear cylinders use the "F" marker as a point of reference.

Please be careful if you're swapping cams out, not understanding the process completely can quite easily lead to a wrecked engine.

Jambo

5hort5 · 31-12-09, 07:02 PM

Just doing the clearances and I have measured the rear on F with the C and D centred and the arrows point at the edges of the chain cover thing, is that right?

yorkie_chris · 31-12-09, 07:07 PM

R mark for TDC. But for purposes of what you are doing just look at cams, so long as no valves are being opened on the cylinder you are messing with it is fine, you do not need exact TDC

5hort5 · 31-12-09, 07:10 PM

Thanks Chris, C and D point up and arrows lining up is good enough for me, off to put some gasket seal on and get this cover back on so I can get **** faced

5hort5 · 31-12-09, 07:38 PM

ok the results are in for my first ever valve clearance check:

Front Cylinder:

Exhaust:
Left - 0.21mm Right 0.25mm

Inlet:
Left - 0.13mm Right 0.13mm

Rear cylinder

Inlet:
Left - 0.15mm Right 0.15mm

Exhaust:
Left - 0.23mm Right 0.23mm

Now I think that's ok, which would be good

jambo · 01-01-10, 02:08 AM

From memory that's everything in tolerance, so happy days, bolt it all back together

01-01-10, 03:25 AM

Quote:

Originally Posted by 5hort5

Thanks Chris, C and D point up and arrows lining up is good enough for me, off to put some gasket seal on and get this cover back on so I can get **** faced

You may not get correct reading that way, especially exhaust cam.
To check clearance you use F for front and R for rear or make sure cam lobes point up.
To install cams you use F mark for both front and rear but one revolution apart.

31-12-09, 05:50 PM	#1
5hort5 Member Join Date: May 2006 Location: Newcastle Posts: 872	TDC on the rear cylinder? when turning the crank to get tdc on the rear cylinder should the mark in the inspection window be an R or an F? On mine it's an F is that normal? The C and D are the right way up and the arrows are in the right place but i would have thought R stands for Rear, is that not correct? thanks si

31-12-09, 06:08 PM	#2
5hort5 Member Join Date: May 2006 Location: Newcastle Posts: 872	Re: TDC on the rear cylinder? anyone about that knows - I could do with getting the valve cover back on but want to make sure I have down the clearances correctly first.

31-12-09, 06:13 PM	#3
Neeja Guest Posts: n/a	Re: TDC on the rear cylinder? Yeah, TDC for rear cyl is on the R

31-12-09, 06:30 PM	#4
jambo Member Mega Poster Join Date: Aug 2003 Location: Croydonia Posts: 5,376	Re: TDC on the rear cylinder? TDC for the Rear cylinder is "R" on the timing inspection cover. HOWEVER, all timing markers for lining up the cams for both front AND rear cylinders use the "F" marker as a point of reference. Please be careful if you're swapping cams out, not understanding the process completely can quite easily lead to a wrecked engine. Jambo __________________ Modern motorcycles are bloody brilliant, enjoy it while we can

31-12-09, 07:02 PM	#5
5hort5 Member Join Date: May 2006 Location: Newcastle Posts: 872	Re: TDC on the rear cylinder? Just doing the clearances and I have measured the rear on F with the C and D centred and the arrows point at the edges of the chain cover thing, is that right?

31-12-09, 07:07 PM	#6
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: TDC on the rear cylinder? R mark for TDC. But for purposes of what you are doing just look at cams, so long as no valves are being opened on the cylinder you are messing with it is fine, you do not need exact TDC __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

31-12-09, 07:10 PM	#7
5hort5 Member Join Date: May 2006 Location: Newcastle Posts: 872	Re: TDC on the rear cylinder? Thanks Chris, C and D point up and arrows lining up is good enough for me, off to put some gasket seal on and get this cover back on so I can get **** faced

31-12-09, 07:38 PM	#8
5hort5 Member Join Date: May 2006 Location: Newcastle Posts: 872	Re: TDC on the rear cylinder? ok the results are in for my first ever valve clearance check: Front Cylinder: Exhaust: Left - 0.21mm Right 0.25mm Inlet: Left - 0.13mm Right 0.13mm Rear cylinder Inlet: Left - 0.15mm Right 0.15mm Exhaust: Left - 0.23mm Right 0.23mm Now I think that's ok, which would be good Last edited by 5hort5; 31-12-09 at 07:42 PM.

01-01-10, 02:08 AM	#9
jambo Member Mega Poster Join Date: Aug 2003 Location: Croydonia Posts: 5,376	Re: TDC on the rear cylinder? From memory that's everything in tolerance, so happy days, bolt it all back together __________________ Modern motorcycles are bloody brilliant, enjoy it while we can

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