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fantic 300 pro

350T Ignition Problem

22 posts in this topic

My 350T was recently fitted with new points and condenser. After letting it sit for about a month it will no longer start. I have ruled out any issues with the carb. The bike has a big fat blue spark. Could the ignition timing be out?

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Have you tried petrol directly into the cylinder ?

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No I haven't tried pouring a little petrol directly in the cylinder. I have tried squirting a little starting fluid in their. No joy whatsoever. Should I try a petrol/oil mix directly in the cylinder?

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Is the plug wet or dry?

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If you have installed new points and condenser you will have to retime the ignition. Even changing the points gap will change the timing. So reset the points to 15 thou or .40mm and then time the ignition to 2.6 mm BTDC ( this is the factory recommendation) I like them at 2.9 mm BTDC which gives them a little bit more zing.

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I have put three new plugs in it and they are all wet after I try starting it. I am thinking the ignition timing needs setting properly.

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Have you checked the flywheel key? It may have sheared.

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Sounds to me like the lower end is just flooded. One kick and it wets the plug. Pull the plug and maybe the head pipe too! You can kick it through without the plug. Be careful of a fire. Been more than one bike I`ve seen go up in flames.

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False alarm on this one.... After spending three prior attempts to get it running I tried again today and it started first kick LOL! Now all I need to do is figure the jetting out as it unresponsive and has very little power. If you fellas have any thoughts/ideas on a fix I would be very greatful.

Thanks to all of you for your help and advice.

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If you have a Dellorto PHBH 28 BS mounted:

- main: 110

- needle: X2, second notch from top

- needle jet: AV 264

- idle jet: 55

- idle screw: depending your location around 1,75 turns

28mm is right (sorry)

Edited by pschrauber

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My bike has a Dellorto PHBH 28 BS mounted to it. It is in very good/clean condition. I have stripped and cleaned it on three separate occasions.

- main: 110 (I think my main is a 115 though this is hard to tell as the marking is worn)

- needle: X2, second notch from top (correct needle)

- needle jet: AV 264 (needle jet is a AV 264 - I believe the 28MM carb should have a AV 266 needle jet)

- idle jet: 55 (I think my idle jet is a 58 but it's hared to be sure as the marking is worn)

- idle screw: depending your location around 1,75 turns (correct)

Bike has a 60 slide fitted

Brand new 200 needle valve and seat fitted as the old seat was badly worn

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Yep sorry the 350 cc has a 28mm in diameter, (the 250cc model has a 26mm) ...

I mixed up the rows while writing off the spec's the other values depending the jets .. are right

the post is already edited.

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Only my thoughts; Spark on the outside can be misleading compared to firing under compression.

in my experience with points ignition and what you describe, try adding an automotive condenser

under the tank, quick & cheap try.

I take it was running after the new points & condenser ?

Larry

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Fantic 300, Is it

running?

Thanks, Larry

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