Need the magic word to start after a rebuild - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 13 (permalink) Old 12-08-2012, 02:32 AM Thread Starter
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Need the magic word to start after a rebuild

T140v - 1977

New pistons 60 over
New bore on cylinders, 60 over
Completely refurbed head by professional
New black diamond valves
New gaskets
New 930 Amals
New oil, etc
~~~~~~~~~~~~~

No start!!!

I am occasionally rewarded with a hint of a start and the odd backfire.

i have spark
Timing is set approx to mark (Boyer)

I have fuel through the Amals

No go. Exhausted from kicking the pig.

Help!
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post #2 of 13 (permalink) Old 12-08-2012, 02:43 AM
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You are doing the first good thing. Walk away and do something else; in this case post here.
It can't be beyond the wit of man to make it go. Compression, spark, air, ignition timing, valve timing. If you're exhausted it probably has compression. You have spark, is it enough to fire under compression? You have fuel, is it getting to the combustion chamber?
Pull the plugs. Wet or dry?
New plugs?
Air?
Does a squirt of Start Yer Bastard make any difference? yes, you can buy it at an auto store.

Good luck. I'm sure you'll work it out.

Last edited by loctitekid; 12-08-2012 at 02:44 AM. Reason: Air
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post #3 of 13 (permalink) Old 12-08-2012, 03:33 AM
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Don't panic. It'll be something simple.

Are you tickling the carbs?

Does it have a choke fitted???


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post #4 of 13 (permalink) Old 12-08-2012, 03:34 AM
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Try tickling the carbs more that you're doing already. Make them gush.
Try a squirt of petrol down the spark plug holes.

Try connecting + and - of the Boyer box to a battery in a car that works.

Is it a Mk111 Boyer, using 12V coils? They sometimes need 6V coils.
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post #5 of 13 (permalink) Old 12-08-2012, 04:40 AM
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Buy a couple of new plugs.
New fuel.
Re-check the ignition timing.
Pilot jets clear?
Clean air filters?
Check battery.
Fuel flow check.
Carb air leaks?
Air/mixture screws 1 1/2 turns out
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post #6 of 13 (permalink) Old 12-08-2012, 04:42 AM Thread Starter
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Thanks guys

I think I've figured it out.

I had to remove and replace my timing case (split) with a new one. This meant refitting the boyer rotor and ignition plate.

I first rotated the stator to the timing mark but she kicked back violently! Wrong timing mark...

Reset the rotor to the other timing mark, which stopped the kickback but no starting.

It dawns on me that this is still incorrect as the mark is only achieved at revs and fully advanced. So, in theory all I have to do it actually refit the Boyer ignition properly so it actually sparks when it should.

Am I correct in this thought?
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post #7 of 13 (permalink) Old 12-08-2012, 05:12 AM
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You need to find TDC first, then the timing mark.
Use the right-hand hole to align the rotor.
The stator should be centred in the slots.
Fit the rotor lightly, so that it can be turned to align with the hole at the 38 BTDC mark.
The stator should only be moved a little when strobing, to advance or retard the timing if required.
This is for a Sparx unit, but its a similar procedure:
https://www.youtube.com/watch?v=gnR-...ature=g-crec-u
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post #8 of 13 (permalink) Old 12-08-2012, 09:49 AM
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Boyers are funny. Try swapping the black/yellow and black/white wires to the trigger.

Vroom!

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post #9 of 13 (permalink) Old 12-08-2012, 11:02 AM
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have y ou adjusted the valves?
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post #10 of 13 (permalink) Old 12-08-2012, 07:39 PM
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Battery a good'un & fully charged?
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