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Sherpa T Mystery


motovita
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Timing setting is absolutely critical on all bultaco's with points as this can vary a hell of a lot

from model to model (i mean different models of sherpa)

and they need regular adjustment as the timing does change

I would suggest replacing the points with a genuine Femsa part

not a pattern EFFE part as they are crap.

If that fails then replace the LT coil

Does not matter where you mount the condensor.

You have only 4 things that can go wrong on the ignition system -

1. LT coil

2. HT coil

3. Points

4.Condensor

9 times out of ten people will always change the HT coil first as it is the easiest to change

and people don't realise there is a LT coil-

BUT 99% of the time it is the LT which goes wrong - usually this is replaced along

with new points and condensor, correct timing and everything works fine.

Just to check wires from LT coil -

Black wire- goes to points-HT coil

Green wire MUST go to earth - either on stator plate mount or up under tank on frame

Red wire is for Horn only- blank this off/tape up if not needed

Yellow wire is for lights only and runs from seperate LT coil - tape up/blank off wire

or take off lighting coil completely.

See how you go......

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Timing setting is absolutely critical on all bultaco's with points as this can vary a hell of a lot

from model to model (i mean different models of sherpa)

and they need regular adjustment as the timing does change

I would suggest replacing the points with a genuine Femsa part

not a pattern EFFE part as they are crap.

Can you confirm 2.5mm BTDC for my 1999 199A 350?

"BUT 99% of the time it is the LT which goes wrong - usually this is replaced along

with new points and condensor, correct timing and everything works fine.

Just to check wires from LT coil" -

Have you seen or do you believe the LT coil could cause my problem with 2.1 ohms resistance and spark at the spark plug?

Edited by motovita
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For what it's worth, my alpina had spark with NO condensor on it! I was in the process of moving it to under the tank. I tried grounding the plug to the engine and hand cranking it. Sure enough, spark! I don't trust the spark test except as a field test. Good luck!

Pete

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New secondary coil (high tension) + one kick = running Bultaco. B)

I've never seen a coil fail like that before. The cracked condenser case was a red herring, it worked fine. I suppose when one rides thirty year old motorcycles surprises should'nt be surprising.

Next event, a week from Sunday. We'll be there.

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