LST Blown motor after 2.5 tanks!  
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All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC Monster Trucks >> Losi Monster Trucks >> LST Blown motor after 2.5 tanks!
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LST Blown motor after 2.5 tanks! - 6/13/2008 5:00:01 AM   
platinumjason


 

Posts: 58
Joined: 6/15/2007
From: Newaygo, MI, USA
Status: offline 		Alright, got a brand new Losi LST today. Decided to take it out and get it broke in for the weekend. Started the truck on a heat gun at 190*. After that temps stayed between 210-215* doing some nice gentle running. On half way through the 2nd tank its rolling along and stops quickly. Thinking nothing major I grabbed it and ran back to the truck for more gas. Fill it up but motor wont roll over at all. Try loosening the plug and nothing. So now I tear the motor apart fearing I broke and rod and I did. Just wondering what you guys may thing have went wrong? Sleeve seems to be in good shape yet. Inside the motor by where the crank broke is all scarred and gouged up from it breaking. Main bearing had some crap in it but I got it to spin over freely after douching it in nitro. Was running 20% Nitrotane.

My only guess is bad machining, why else would something with 2.5 tanks on it just destory itself?





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RE: LST Blown motor after 2.5 tanks! - 6/13/2008 5:10:59 AM   
newaddict



Posts: 203
Joined: 8/18/2007
From: Mississauga, Ontario, CANADA
Status: offline 		Contact Horizon customer service and hopefully they will hook you up with a new engine or a new conrod. I would think that its their responsibility to ensure you get a good engine.

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RE: LST Blown motor after 2.5 tanks! - 6/13/2008 5:14:49 AM   
platinumjason


 

Posts: 58
Joined: 6/15/2007
From: Newaygo, MI, USA
Status: offline 		Yeah I did earlier along with the pics. Just hope they can help me out. Kind of shoots my whole weekend in the ass =\


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RE: LST Blown motor after 2.5 tanks! - 6/13/2008 5:37:33 AM   
newaddict



Posts: 203
Joined: 8/18/2007
From: Mississauga, Ontario, CANADA
Status: offline 		I can sort of relate to what you're going through. Although its not as big as losing an engine, it is enough to stop me from bashing. My idle screw/needle snapped in half inside the carb and I can't run the truck because the carb just doesn't work properly. Btw this is on a 1 gallon old lrp spec 3 and just to add, I NEVER messed around with the idle screw, I only played around with the radio trim settings....so how did this happen? Who knows?

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RE: LST Blown motor after 2.5 tanks! - 6/13/2008 7:20:03 AM   
Mr Terminator



Posts: 399
Joined: 11/14/2007
From: Manchester, UNITED KINGDOM
Status: offline 		That sucks dude,gotta be a manufacturing defect as you went by the book on the break in.You can't even make a good keyring out of it unless you drill the bottom of the rod.Hope you get sorted out buddy....

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RE: LST Blown motor after 2.5 tanks! - 6/13/2008 1:00:20 PM   
full maxx



Posts: 768
Joined: 8/26/2007
From: elon, NC, USA
Status: offline 		that sucks

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RE: LST Blown motor after 2.5 tanks! - 6/13/2008 4:17:23 PM   
DawgBone


 

Posts: 170
Joined: 1/24/2006
From: Mandeville, LA, USA
Status: offline 		What engine is that?
I don't remember any of my Mach's having a knife edged conrod like that....although it's been some time since I last opened one up. I've never messed with the .26SS either...

You say LST, as in a LST1 or LST2? The very early LST1's had a shim between the conrod and OWB that would make the engine self destruct...It was some of the very first runs of the OG blue headed Mach .26's....
Also, there should be a brass bearing/bushing in the part that broke. Any signs as to where it is? If it's not in the engine, and not in the pipe, it may had never had one...

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RE: LST Blown motor after 2.5 tanks! - 6/13/2008 5:11:51 PM   
RCtruckRacer



Posts: 3195
Joined: 6/2/2005
From: Eugene, OR, USA
Status: offline 		I was thinking the same thing Dawg - What version was the LST Jason? If it was an LST1, was the serial # lower than 11,000? If so, you just got burned by the washer of death. If not, then not having a brass bushing in the conrod could have accounted for this. Either way, Horizon will take care of you.

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RE: LST Blown motor after 2.5 tanks! - 6/13/2008 5:15:23 PM   
ThunderbirdJunkie



Posts: 11001
Joined: 7/25/2004
From: Mason, OH, USA
Status: offline
quote:

ORIGINAL: DawgBone

What engine is that?
I don't remember any of my Mach's having a knife edged conrod like that....although it's been some time since I last opened one up. I've never messed with the .26SS either...

You say LST, as in a LST1 or LST2? The very early LST1's had a shim between the conrod and OWB that would make the engine self destruct...It was some of the very first runs of the OG blue headed Mach .26's....
Also, there should be a brass bearing/bushing in the part that broke. Any signs as to where it is? If it's not in the engine, and not in the pipe, it may had never had one...


My M427 and XTM .247 have a con rod that looks like that. my M26 and my SH 28 P3 do not.

First thing I thought was "where's the bushing???" but it may still be on the crank.

*EDIT*

I lied, the SH 28P3 and M26 both have that same rod.

Also looks like the big end on the con rod (yes, that IS a technical term ) looks to have a hole much bigger than mine...which would be explained by not having a rod bushing and the crank beating the snot out of the rod.
Without a bushing, I'd be shocked the engine ran THAT long and is a testament to SH reliability

< Message edited by ThunderbirdJunkie -- 6/13/2008 5:18:58 PM >

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RE: LST Blown motor after 2.5 tanks! - 6/13/2008 9:49:09 PM   
platinumjason


 

Posts: 58
Joined: 6/15/2007
From: Newaygo, MI, USA
Status: offline 		Its an original LST1. Its the Mach .26 with the blue head. Sounds like I got a junker =\ I just hope Horizon will help me out with this. Serial is 012,985


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RE: LST Blown motor after 2.5 tanks! - 6/13/2008 10:39:31 PM   
RCtruckRacer



Posts: 3195
Joined: 6/2/2005
From: Eugene, OR, USA
Status: offline 		That is a definate candidate for the washer of death: http://www.rcuniverse.com/forum/m_2391794/anchors_2391794/mpage_1/key_remove%252Cwasher/anchor/tm.htm#2391794

This is a known problem, Horizon will take care of it. Dang surprising to see one of these brand new after all this time!

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RE: LST Blown motor after 2.5 tanks! - 6/13/2008 10:44:32 PM   
platinumjason


 

Posts: 58
Joined: 6/15/2007
From: Newaygo, MI, USA
Status: offline 		Yeah I actually bought the truck from a member on here. Said he bought it a while back to use during the summer but had some expenses or something come up so he had to get rid of it. I was a bit surprised myself to find a brand new never run original LST. Didnt find anywhere that had one in stock.


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RE: LST Blown motor after 2.5 tanks! - 6/14/2008 12:01:34 AM   
ThunderbirdJunkie



Posts: 11001
Joined: 7/25/2004
From: Mason, OH, USA
Status: offline
quote:

ORIGINAL: platinumjason

Its an original LST1. Its the Mach .26 with the blue head. Sounds like I got a junker =\ I just hope Horizon will help me out with this. Serial is 012,985


Sounds like a candidate for an LRP 28

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RE: LST Blown motor after 2.5 tanks! - 6/14/2008 5:39:22 AM   
platinumjason


 

Posts: 58
Joined: 6/15/2007
From: Newaygo, MI, USA
Status: offline 		Yeah, made up my mind. Im getting the LRP. I hope Horizon replaces the motor so I can sell it to get a little of my money back. Im guessing the LRP pullstart wont fit in the Losi? Seemed to be a tight fit with the stock motor. Let me know. Also wheres the cheapest place to get one? Thanks everyone.


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RE: LST Blown motor after 2.5 tanks! - 6/14/2008 4:24:48 PM