Author Topic: Thorspark ignition  (Read 215 times)

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Link1473

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on: July 07, 2024, 10:21:22 pm
Hi all.
I have been running my 1955 Bullet 350 with Thorspark Ignition for a few years now without any problems, however, recently it has become very difficult to start when hot. No problem when cold.
Would appreciate any advice on this matter.
Best regards
Chris


AzCal Retred

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Reply #1 on: July 07, 2024, 11:49:47 pm
A Magdyno? All mechanicals OK? Hot start issues are classically electronic ignition territory. Sounds like it's "new parts" time...$$$

https://www.hitchcocksmotorcycles.com/partsbook/78/1955-350cc-bullet-g2
https://www.hitchcocksmotorcycles.com/partsbook-pages/1439

https://www.sussexmotorcycles.com/thorspark.html
The Thorspark(TM) electronic ignition kit is easy to fit yourself, fits inside the end cap of the magneto, and will give superior performance to most magnetos.  It is an alternative to rewinding or repairing the magneto; the magneto does not need to be removed, and no permanent modifications are needed to the magneto.  It gives superior performance at a lower price.
£150 for most kits, 5 Year Unlimited Mileage Guarantee
non transferable

A trifecta of Pre-Unit Bullets: a Red Deluxe 500, a Green Standard 500, and a Black ES 350.


Citrus

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Reply #2 on: July 09, 2024, 11:27:54 pm
Assuming you are still using the original advance /retard -check that the mechanical advance/retard springs are OK (ie that it is returning to retard position when stopped). The springs get weak and need replacing occasionally


Link1473

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Reply #3 on: Yesterday at 12:38:19 pm
I have ordered a new Coil. HT Cable and Spark Plug from Sussex Motorcycles. Will give that a try. Yes. the adv/rtd is working fine.
It still has the old Regulator. Should I replace it with a new Solid State.
Your advice is really appreciated.
Chris


Adrian II

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Reply #4 on: Yesterday at 12:55:39 pm
Only if it's kaput.

A.
Grumpy Brit still seeking 500 AVL Bullet perfection! Will let you know if I get anywhere near...


Link1473

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Reply #5 on: Yesterday at 02:58:21 pm
 It's charging fine. What's the life span of these old regulators. Looks very original to me


grumbern

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Reply #6 on: Yesterday at 07:05:45 pm
Give it some maintenance and let it "rattle on" 8)