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......

I always look at the points before the carb, bings set up right last a long while untouched.

Ah, yes. I mean for an Amal.

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 September 27, 200916 yr by motovita

If Pedronicman says swap the LT coil he is probably right......will drop you a pm to explain

Regards

Martin

Can you confirm 2.5mm BTDC for my 1979 199A 350?

YES that is correct

Has the problem been solved?

I haven't heard anyone mention spraying WD40 around the carb boot and then around the crank seals. Quick, simple way to see if the rubber parts are no longer doing their thing.

Alan

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

I got the .36 mfd condenser, installed it, and as was predicted it made no difference. Today I will order a secondary coil. I'm not very confident but I'm reduced to guessing what to replace next.

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

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.

Glad you're sorted. At least along the way you got the wiring tidied up/Simplified?

Never had a Femsa HT Coil fail (yet!) LT yes.

Wayne....