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#Post#: 14102-------------------------------------------------- |
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Kaboom blown engine |
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By: Paddy the pilot Date: December 4, 2025, 2:52 am |
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I had an interesting morning last week, I installed a 4 degree |
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ignition advance key, the engine started well and with it warmed |
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up I decided to see how it revved up, the kart was on a stand |
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and I got quite the surprise. |
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The flywheel magnet decided to break loose, nobody hurt but my |
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wallet took a hit. |
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I wonder if any other members have experienced a similar thing. |
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#Post#: 14106-------------------------------------------------- |
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Re: Kaboom blown engine |
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By: Jimr1999 Date: December 4, 2025, 4:42 am |
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Ouch, at least you have a good supply of spares for the new |
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engine Paddy. A good Scot would keep as many bits as possible, |
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Crankshaft might swap over if the flywheel is compatible, keep |
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the head to practice mild porting on. All the performance bits |
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should swap over (Carb, valve springs etc). I bet your wallet |
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took a bigger hit getting to the last event :-) |
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I have heard of the glue letting go before. The stuff I read |
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that they use is 2 part and sensitive to temperature in cure and |
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has a short pot life when mixed. Care in preparation and |
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application necessary. |
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All the best, |
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JimR |
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#Post#: 14107-------------------------------------------------- |
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Re: Kaboom blown engine |
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By: NewbieNick Date: December 4, 2025, 4:55 am |
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Hi Paddy. I know exactly how you feel, my Lifan engine |
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dismantled itself after about 10 meetings. |
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Can you tell me what make engine it was. |
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Hope you have more luck with the next one. |
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Cheers Nick |
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#Post#: 14111-------------------------------------------------- |
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Re: Kaboom blown engine |
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By: Ian F Date: December 4, 2025, 8:11 am |
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Hi Paddy, sorry to hear about your magnet letting go. |
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I did a lot of research three years ago into flywheels |
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grenading, and whilst there were lots of people saying how |
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unreliable and dangerous they were, there was not one single |
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story from first hand experience, just the usual scare-mongering |
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based on heresay. However, there was one single first-hand |
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story of someone's magnet letting go! |
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Do you have any further information of what failed and the |
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resultant damage, plus also whether the errant parts were |
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contained within the shield? |
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#Post#: 14115-------------------------------------------------- |
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Re: Kaboom blown engine |
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By: Paddy the pilot Date: December 4, 2025, 3:53 pm |
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Ian & Nick, |
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I had the kart up on a stand and was standing over it when it |
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let go, nothing really went flying part of the coil (with the |
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broken mount) ended up on top of the engine. The cowl contained |
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everything else, magnet pieces and the metal plate which covers |
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it. The cowl was slightly bent and shows a small puncture hole. |
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As I didn't have a tachometer on it I don't know what kind of |
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revs it was pulling but quite high, I had removed the governor |
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and put a 4 degree advance wood-ruff key in place of the |
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original. |
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The engine was an old 196cc that had been used on a lawnmower at |
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one stage if it's checkered life, there was quite a bit of rust |
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on the surface to which the magnet was attached. |
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I hope this helps and if you want to chat about it please feel |
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free to call me. |
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Paddy the Pilot |
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#Post#: 14117-------------------------------------------------- |
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Re: Kaboom blown engine |
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By: Ian F Date: December 5, 2025, 1:27 am |
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Hi Paddy, thanks very much for the detailed response and the |
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photo, its great to have some real-life experience and data ;D |
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