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Old 11-09-2012, 12:08 PM   #1
ggamster OP
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Location: Tunnel Hill, IL
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TDC on TTR125

Hello, guys. Quick question. I am trying to set TDC on the TTR125 but there are three marks. could you please advise me on which one to use? There is the first one and then about a 1/4" gap. A second one then a 1/8" gap and finally the third. Please advise asap and I am working on this now. It seams as if it wants to rest between the second and third.
thanks
Grant
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Old 11-09-2012, 05:46 PM   #2
CycleDoc59
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TDC can be found (and your mark verified) by poking something
in the spark plug hole, holding it in position, then rotating the engine -slowly, carefully-
forward,then backward till the piston touches the object in each
direction. TDC is exactly halfway between the two "touches"

Here is a tool made just for that purpose:
http://performanceunlimited.com/cobr...tdcfinder.html

And another:
http://nfieldgear.com/enfield-store/...nder-tool.html
But it works a bit differently, as it has markings and rises/falls as the
piston moves.
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Old 11-09-2012, 06:56 PM   #3
matey peeps
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Just a guess, but as you're turning the engine in its direction of rotation the first two are likely the full advance marks and the last would be TDC. Perhaps.
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Old 11-12-2012, 07:44 AM   #4
ggamster OP
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Quote:
Originally Posted by matey peeps View Post
Just a guess, but as you're turning the engine in its direction of rotation the first two are likely the full advance marks and the last would be TDC. Perhaps.
I found out that you are correct. this is what it looks like I----I I The third mark is TDC after the intake valve closes
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