Seized Engine - Page 4 - Triumph Forum: Triumph Rat Motorcycle Forums
Air Cooled Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, Bobber, T100, Speedmaster, America, Thruxton, and Scrambler.


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post #31 of 41 (permalink) Old 03-07-2019, 10:31 AM
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If it is just the top end as some have suggested, should he just go with the 900 kit?
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post #32 of 41 (permalink) Old 03-07-2019, 01:30 PM
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Plattys I am also in Brooklyn, did you speak to anyone locally here? Hugh at Sixth Street Specials in LES is really great with Triumphs.
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post #33 of 41 (permalink) Old 03-07-2019, 10:19 PM Thread Starter
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I spoke to the mechanic again today, he mentioned, as others on this forum have informed me, that the new engines have plastic supports in them which will melt very quickly under the right (wrong) conditions leading potentially to an engine sieze. He thinks he has located an engine on eBay with relatively low miles that will fit...we are planning to go ahead with that and hopefully get the bike back to life. I guess I would have liked to have known about the plastics in the engine, I’m not sure the dealer mentioned that nor did the manual...lessons learned. That said it’s a wonderful bike which deserves to get back on the road.
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post #34 of 41 (permalink) Old 03-08-2019, 02:07 AM Thread Starter
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Hi Mcharn, I haven’t spoke to anyone locally yet and hope that the used engine we’ve located will solve it. Thanks for asking, Sp
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post #35 of 41 (permalink) Old 03-08-2019, 08:43 AM
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I guess I would have liked to have known about the plastics in the engine, Iím not sure the dealer mentioned that nor did the manual...lessons learned. That said itís a wonderful bike which deserves to get back on the road.
There's a thread on here somewhere that mentions the people that have reached 100,000 miles on their bikes, the plastic(as you call them) gears are in all of their engines. The reason your engine seized has nothing to do with those gears. I cant recall any dealer ever mentioning to me how a engine was built and I've bought a lot of vehicle in my time.
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post #36 of 41 (permalink) Old 03-08-2019, 08:52 AM
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I spoke to the mechanic again today, he mentioned, as others on this forum have informed me, that the new engines have plastic supports in them which will melt very quickly under the right (wrong) conditions leading potentially to an engine sieze. He thinks he has located an engine on eBay with relatively low miles that will fit...we are planning to go ahead with that and hopefully get the bike back to life. I guess I would have liked to have known about the plastics in the engine, Iím not sure the dealer mentioned that nor did the manual...lessons learned. That said itís a wonderful bike which deserves to get back on the road.

You fast idle an air cooled engine for 45 minutes and then blame others?

TTP Tune#3, NH Toga's.

I'm no Gynecologist but hey I'll take a look.
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post #37 of 41 (permalink) Old 03-08-2019, 09:13 AM
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You fast idle an air cooled engine for 45 minutes and then blame others?
That wasn't my read. He beats himself up in post number 29.
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post #38 of 41 (permalink) Old 03-08-2019, 09:57 AM
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That wasn't my read. He beats himself up in post number 29.
Yeah, that's how I got it too. Totally owned what he did. And I understand most people's thinking behind "plastic gears" in engines (worked on early race motors with Torlon piston skirts and the likes, the modern UHMW plastic should be categorized as an "engineering non-metal alloy," not "plastic," really, many are as reliable as aluminum alloys anymore, with lubricity and other benefits above many of the metal alloys now used). He owned up to what happened, isn't blaming anyone but himself and is working on getting his bike up and running. Totally feel for the guy, all in all. Wish I could get an engine to him, but sounds like his mech is on it.

I suspect it's not the "plastic gears" so much as it is just an overheated air-cooled engine that seized.
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post #39 of 41 (permalink) Old 03-08-2019, 10:23 AM
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Totally feel for the guy, all in all.
Yep. We've all been there (or somewhere similar). Most of the time dumb luck saves us from ourselves.
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post #40 of 41 (permalink) Old 03-08-2019, 11:16 AM
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Originally Posted by Plattys View Post
I spoke to the mechanic again today, he mentioned, as others on this forum have informed me, that the new engines have plastic supports in them which will melt very quickly under the right (wrong) conditions leading potentially to an engine sieze. He thinks he has located an engine on eBay with relatively low miles that will fit...we are planning to go ahead with that and hopefully get the bike back to life. I guess I would have liked to have known about the plastics in the engine, Iím not sure the dealer mentioned that nor did the manual...lessons learned. That said itís a wonderful bike which deserves to get back on the road.


I feel for you and am not trolling you but on page 47 of your Triumph Bonneville manual while it doesn't talk about specific engine components (or what material their made of) that may or may not fail after a 45 minute fast idle it does say:

This Triumph motorcycle is air cooled and consequently requires air-flow over the cylinders and head to maintain correct engine operating temperature. Extended periods of idling or prolonged rides at very slow speeds, such as in very slow moving or stationary traffic, may overheat the engine resulting in severe damage.
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TTP Tune#3, NH Toga's.

I'm no Gynecologist but hey I'll take a look.

Last edited by yrunvs; 03-08-2019 at 11:23 AM.
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