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Pre unit T100 valve Timing #620591
10/05/15 10:36 am
10/05/15 10:36 am
Joined: Jun 2013
Posts: 96
Yorkshire
K
Keith Offline OP
BritBike Forum member
Keith  Offline OP
BritBike Forum member
K
Joined: Jun 2013
Posts: 96
Yorkshire
Hi,

Just got this motor with the intention of using it for classic motocross. I got it from the guy who got it from the guy that built it so no guarantees here but it is supposedly in good condition and ready to run. I understand it could have been used, or at least set up to use in competition. Everything is very clean, piston top, valves and whatever else I can through the various orifices and most of the gaskets look new.

Now to my (first) question. On taking the timing cover off I am confronted with loads of marks on the pinions. Would these have been used by someone to set the valve timing? I'm afraid I'm clueless as far as this subject is concerned but I would like to learn.

Hopefully someone with more knowledge than me can help.

Thanks, Keith.


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Re: Pre unit T100 valve Timing [Re: Keith] #620614
10/05/15 12:45 pm
10/05/15 12:45 pm
Joined: Aug 2001
Posts: 7,026
scotland
triton thrasher Online content
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triton thrasher  Online Content
BritBike Forum member
Joined: Aug 2001
Posts: 7,026
scotland
Don't remove the idler pinion, or let it fall out.

Unless you want to reset the timing on unknown cams, with a degree wheel.


Amateur Loctite enthusiast.
Re: Pre unit T100 valve Timing [Re: Keith] #620627
10/05/15 2:21 pm
10/05/15 2:21 pm
Joined: Jun 2007
Posts: 5,557
Maui Hawaii
HawaiianTiger Online content

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HawaiianTiger  Online Content

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Posts: 5,557
Maui Hawaii
Jeez, the guy should have at least used different colors for the inlet vs. exhaust. I don't see how you will ever know which timing marks to use.

You could laboriously turn over the motor one rev at a time until everything lines up just right, but it could take around 90 revs to do it. And if the idler falls out, it's back to square one.

Cheers,

Bill


Bikes
1974 Commando
1985 Honda Nighthawk 650
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Re: Pre unit T100 valve Timing [Re: HawaiianTiger] #620921
10/07/15 2:29 pm
10/07/15 2:29 pm
Joined: Jun 2013
Posts: 96
Yorkshire
K
Keith Offline OP
BritBike Forum member
Keith  Offline OP
BritBike Forum member
K
Joined: Jun 2013
Posts: 96
Yorkshire
So what do you reckon, stick it in the frame, fit a carb and mag and see what happens.

Keith.

Re: Pre unit T100 valve Timing [Re: Keith] #620926
10/07/15 3:17 pm
10/07/15 3:17 pm
Joined: Aug 2001
Posts: 7,026
scotland
triton thrasher Online content
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triton thrasher  Online Content
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Joined: Aug 2001
Posts: 7,026
scotland
I would check what the cam duration and timing is.

That doesn't mean you have to.


Amateur Loctite enthusiast.
Re: Pre unit T100 valve Timing [Re: triton thrasher] #620934
10/07/15 4:22 pm
10/07/15 4:22 pm
Joined: Nov 2008
Posts: 2,712
Bishop, Calif.
D
desco Online content
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desco  Online Content
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Joined: Nov 2008
Posts: 2,712
Bishop, Calif.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
Re: Pre unit T100 valve Timing [Re: desco] #621079
10/08/15 5:09 pm
10/08/15 5:09 pm
Joined: Jun 2013
Posts: 96
Yorkshire
K
Keith Offline OP
BritBike Forum member
Keith  Offline OP
BritBike Forum member
K
Joined: Jun 2013
Posts: 96
Yorkshire
Had a look through that thread and I think I should be able to sort out the equipment needed and then get some figures. They'll not mean much to me but hopefully someone here will be able to decipher them.

Thanks, Keith.

Re: Pre unit T100 valve Timing [Re: Keith] #621082
10/08/15 5:24 pm
10/08/15 5:24 pm
Joined: Aug 2001
Posts: 7,026
scotland
triton thrasher Online content
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triton thrasher  Online Content
BritBike Forum member
Joined: Aug 2001
Posts: 7,026
scotland
Also, if you must wire nuts, do it properly so the wire is pulling both nuts tight.


Amateur Loctite enthusiast.

Moderated by  John Healy 


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