Strobe timing.wmv

Strobe timing my Bonnie the most important thing is to check whether the mark on your alternator corresponds to TDC (most likely) or for 38deg BTDC. some later cases with a small inspection plug ieT140 type are set for 38deg but it is always worth checking with the crankshaft notches accessed through the plug at base of barrels.
Boyer recommend around 5000 rpm to set timing. If you do not have a tacho continue reving until the mark stops moving (advancing) this is the max revs you will need to set timing.

Category:

Autos & Vehicles

Tags:

• lunmad
• triumph
• bonneville
• strobe
• timing
• ignition
• marks

[gerwoodholland]

Hi lunmad, great videos - thanks once again.

I've tried to strobe my T140E (with a small inspection plug) but get a face full of oil spray when the plug is out. Should this happen? If yes, how do I strobe a T140E? Thanks.

[lunmad]

@gerwoodholland

Hi gerwood

you might get a little oil but should not get a face full, you could drain the oil from the primary case and refill after you have strobed it.

There are three small holes in the crankcase that allow excess oil to drain back into engine it sounds like these may be blocked you should remove the primary case and check they are clear with a piece of wire.

[gerwoodholland]

@lunmad Thanks for the reply. This face full of oil is just that - a real continuous blast. So much that it's impossible to look in the inspection hole. It's accompanied by a hissing sound which I assume to be the high pressure source of the oil. Could this be some sort of leakage from the crank/big end?

[lunmad]

@gerwoodholland

The crank vents into the primary side, gases and oil vapour. The gases should leave the motor by the vent pipe and the oil transferred back into the crankcase through them three small holes and then scavenged back to the oil tank.

There should be only a small amount of oil in the primary side maybe half a cup if that, much more than this will give you clutch problems and oil leaks.

[britishteen]

Thank you very much for your information. I have a half dozen bsa and triumphs that I would like to keep on the road for a long time . Your video's will help me do that. Any idea why my exhaust pipes gets red and turns blue? I will try to set the timing by your video and then check my jet size. thanks

[danbonnielux]

Thanks Lunmad for your quick reply and your tip.I didn't think It was worth to run this old bike with the 98 oct. but I will try. I set the timing at the basic 38° before tdc and then I set It down a bit till the engine stop pinking when running up Hill at low load.

danbonnielux

[lunmad]

@danbonnielux

Hi danbonnie :-) you should run the highest octane fuel you can get hold of over here it is 97-98 octane.

If not yes you should retard (set down) the timing until the motor stops pinking. You can induce pinking by going slow or up a hill in a high gear then retard timing a little at a time until I can no longer make it ping.

[danbonnielux]

@62g12cs .Thanks Lunmad for this great video.That confirm I was doing the right way when setting up the ignition timing on my 1970 T 120 R(with Boyer Bransden micro digital).My question is:As I run with 95 unleaded gas,should I set down the ignition timing from 38° to 35° or even less.??

[katefeeley]

hi lunmad have been watching your vid for a year now can i say they are brilliant

i have a 69 bonnie i have set up the carbs as in vid it run ok for a while i stop it

then can't get it to start again. when i check plugs one has stoped working i think its burnt out because when i put in new plug in it runs. it back fires somtimes on kickstart ,my ankle hurts like hell. any ideas .ferritdave

[lunmad]

@62g12cs

Thanks Rick you are doing a caulker of a job on your 3HW

best of luck for the show, will you be riding it there?

I think any bike ridden to a show should be rated x10 above the ever so common trailer queens.

John