Triumphrat

terry1956 · 11-11-2009, 11:02 AM

Hi can anyone please tell me what size bolt i need for the timing dial. I have a 1969 T120R.
thanks, michael

PS. CAN ANYONE POINT ME TO A GOOD GUIDE FOR TIMING THIS BIKE,WITH PICTURES BECAUSE I AM THINK. I THINK ITS ALL OVER THE PLACE.

Webby · 11-11-2009, 08:39 PM

Hi Terry,

You don't really need a timing disk.
As you have a 69 your bike should be fitted with a timing notch in the flywheel. To get to this you should find a plug in the crankcases behind the crank, you don't need the triumph tool, a socket and screwdriver will do the same job. Just turn the engine over until you find the notch and set the static timing to 38° BTDC (you can check this with the pointer on the alternator rotor or with a stick in down the spark plug holes)
Once you have the static timing set, start the bike and finish with the dynamic timing at about 3000 rpm.

I hope this helps

Webby

terry1956 · 11-12-2009, 04:07 AM

Hi, thanks for the input, but you lost me with the alternator bit,
I was using the manual that states use the centre flywheel position, ie the centre casing hole with a stich pushed in. This gives TDC and then turn the backwheel back and use the timing dial to find 38* BTDC, OK. but I can,t bolt the dial on due to not knowing what size bolt to use.
am I doing something wrong here.
terry

Webby · 11-12-2009, 05:22 AM

Hi Terry,
You should have 2 slots in the flywheel, one at TDC and another at 38° BTDC. Normally the 38° BTDC is marked on the alternator rotor.
As for the size of the bolt, I'm not sure, but I seem to remember it's a UNF size.
If you have a look at http://www.triumphrat.net/attachment...d-dsc00261.jpg It shows a pic of the flywheel notches.

Also if you do a search, Plewsy has done one of his very good videos on the subject.

I hope this helps

Webby

Plewsy · 11-12-2009, 08:26 AM

Hi terry1956

the bolt I use is a 3/8"UNF I do not run the motor with it attatched I use the marks on alternator to do the strobing.
Here is the vid Webby mentioned

http://www.youtube.com/watch?v=zPKoZpWAuqQ
there are a few ways to work out the crank position,
1 a mark on the alternator rotor and a pointer on the case
2 two notches on the flywheel
3 piston position down sparkplug hole.

GrandPaulZ · 11-12-2009, 09:49 AM

If the bike is running, forget all the rest, use a strobe light and set the timing at 3500 RPM if points, or at 5,000 RPM if electronic ignition, pointing the light at the timing window on the left side of the engine in the primary cover inspection hole.

gaillarry · 11-14-2009, 09:19 AM

There are two notches on the flywheel, the first one is 38 BTDC and the second one is TDC. Use the first notch to set the timing.

texjj · 11-21-2009, 11:42 PM

You guys are lucky. I'm going to time my '68 650 Trophy (DU68703).
- it has no access hole/bolt to get to the flywheel
- it has a single factory mark on the alternator/primary
- it has no marks on the primary case, nor a 4th node screw-hole

What a nonintuitive way to deliver a factory bike. I'll use the procedure specified in the repair manual to determine TDC and 15 degrees BTDC.

It was running 27 years ago when I parked it. So I'll start it first to at least get a feel for it.

Thanks to Webby for the timing dial file.

Webby · 11-22-2009, 08:36 AM

No worries for the timing disc

To time you bike up is easy, it just takes a little time, a timing disc, a short screwdriver & a length of stiff wire.

1) Attach the timing disc to the alternator side of the crankshaft.
2) Attach the wire to somewhere on the crankcase bent round near the timing disc to act as a pointer.
3) Put the screwdriver down the sparkplug hole (the L/H cylinder is easiest) and turn the engine until the screwdriver starts to lift (at this point I use the bottom of the handle of the screwdriver and a point on the engine as a datum)
4) Rotate the timing disc so it reads zero.
5) Turn the engine in the OPPOSITE direction until the screwdriver gets to the same point again.
6) Note the reading on the disc, take this figure and halve it, this will be TDC.
7) Rotate the engine 38° BTDC and set your ignition timing.

I hope this helps

Webby

dogtired · 11-22-2009, 09:06 AM

This is an awesome resource page.

It has workshop manuals for most of the Triumph bikes. You can download to your computer the entire workshop manual and then just print out the relevant pages when needed.

It is located here

I heavily suggest you bookmark this page.
Then save your relevant manual to disc.

Or instead of printing it out, just take your laptop to the bike!