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Old 01-03-2019, 02:14 PM   #1
self_moto
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Cylinder head repairable? (Triumph Street Triple 13)

Hi,

So, I finally got to died engine to figure out what the damages are, and looks like it's only a cylinder head (including exhaust valves and piston of course). Rest of the engine looks good, haven't see any damages on crankcase, crankshaft, etc.

https://imgur.com/a/uKUPc4m

I'm wondering is it repairable? or should I just got a new head instead? Also wondering maybe you can suggest someone with experience in rebuilding of triumph engines? (I would like to get more power from engine after rebuild)
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Old 01-03-2019, 02:20 PM   #2
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Ouch! I'm no master mechanic or anything but it doesn't seem like something that causes that much damage to the head wouldn't damage the walls of that cylinder just as much. Have you taken a close look at that? My gut says the cylinder walls of that cylinder are just as fuxored as that head is.
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Old 01-03-2019, 02:22 PM   #3
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Anything's repairable if you throw enough money at it.

No hole in the piston?

looking at the parts fiche, intake valves are $51 each and exhaust valves $61. there's absolutely some welding and machine work required on top of that.

there are a couple heads on ebay for 300ish. you might be able to run a Daytona or R head for a few more ponies, I don't know. given the price of a (supposedly) good used head, I'd be tempted to go that way instead.

or, there are complete engines available for ~1k. I'd be tempted at that point, especially if Triumple specific forums say that you can easily swap a D675 engine for more power.
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Old 01-03-2019, 02:36 PM   #4
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Is it repairable? Yep. Is it worth it. As Junkie said. No.

I've had that head problem more than once. I strip out the parts I want and throw the head on the recycle heap.

I buy heads on ebay. Be picky, look the pics, particularly the combustion chamber area. Look for low mileage heads. I won't buy anything over 5k miles and prefer under 1k. I've never paid more than $350 for a good GSXR hear.
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Old 01-03-2019, 02:49 PM   #5
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Originally Posted by Junkie View Post
Anything's repairable if you throw enough money at it.

No hole in the piston?

looking at the parts fiche, intake valves are $51 each and exhaust valves $61. there's absolutely some welding and machine work required on top of that.

there are a couple heads on ebay for 300ish. you might be able to run a Daytona or R head for a few more ponies, I don't know. given the price of a (supposedly) good used head, I'd be tempted to go that way instead.

or, there are complete engines available for ~1k. I'd be tempted at that point, especially if Triumple specific forums say that you can easily swap a D675 engine for more power.
There is a hole in piston (added more pics), I guess that has prevented more damage... I went with whole engine replacement (last year), cost me 1200$ (for engine only).

Old/dead engine was laying in container for a year almost I'm thinking to rebuild it, swap with current one and sell current one (2 reasons why I'm thinking to rebuild 1) make so engine number match to title 2) get more power). Or just sell parts.
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Old 01-03-2019, 02:53 PM   #6
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Originally Posted by thePUNISHER View Post
Ouch! I'm no master mechanic or anything but it doesn't seem like something that causes that much damage to the head wouldn't damage the walls of that cylinder just as much. Have you taken a close look at that? My gut says the cylinder walls of that cylinder are just as fuxored as that head is.
I was expecting same thing, but it looks "okay", no visible damage, and good thing that this engine has cylinder sleeves, so apparently those are replaceable.
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Old 01-03-2019, 02:57 PM   #7
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looking at bikebandit, the complete head is the same for 09-12 ST and STR

apparently the Daytona heads can be used, but have a different shape exhaust port and I guess require a different exhaust
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Old 01-03-2019, 02:59 PM   #8
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given the cost of parts I don't think it's worth trying to repair that engine: a piston is >$250, add in the gaskets and various other parts and you'll have quite a bit of money into it
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Old 01-03-2019, 03:19 PM   #9
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As others have said, junk. Get a good used one and call it a day. I'm also wary that the cylinder wall isn't fuxored; that metal had to go somewhere when it got chewed up. Not worth the risk of grenading a second cylinder head/engine block.
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Old 01-03-2019, 03:26 PM   #10
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my race R6 did something similar. buy a used engine.
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Old 01-03-2019, 04:16 PM   #11
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The head is junk.

What does the cylinder wall look like?

Also, it's entirely possible little metal bits went places they shouldn't. You're looking at a complete engine tear down and rebuild, checking everything and leaving nothing to chance. If you have the time and money, it can be a fun experience. But my recommendation is find a good used engine.
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Old 01-03-2019, 05:00 PM   #12
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Based on the pics it will be a miracle if the cylinder wall is ok. That valve head bounced around in it long enough to hole the piston. Also, the cylinder is almost certainly Nikasil, which means sending the block out and paying $600 to have it fixed and relined. Nobody uses cast iron liners anymore. And, as mentioned, there's pflug in the cases that went everywhere. I have torn down a couple of those. It's toast. Forget it.

Have you ever rebuilt a motorcycle motor? It's not exactly like a lawnmower.
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Old 01-03-2019, 06:03 PM   #13
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Head kaput.

Engine case/cylinders good with one caveat, that bad cylinder wall will need a very close inspection that there's no bad scratches.
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Old 01-03-2019, 06:33 PM   #14
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The exact same thing happened to my friend's 2014 STR at 60k miles. Traded it in on a new one. Triumph wouldn't do a thing.
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Old 01-03-2019, 06:50 PM   #15
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Originally Posted by afm199 View Post
Have you ever rebuilt a motorcycle motor? It's not exactly like a lawnmower.
That's what I started on.
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