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Another one back from the dead (1997 King Quad 300 LT-FWDX)


Hagbard
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Imgur says it was the Yamaha tag, apparently there is quite a rabid fandom.   With such a low financial barrier to entry, I can see why they’re so popular.  

The oiler was long gone when this happened, there’s an aftermarket delete plate where the oiler should be, and it isn’t anything recent.

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this was the condition of the wrist pin bearing when I removed it:
3BFF8770-3D3F-44C9-9DB6-2246D61F1D5A.thumb.jpeg.7d37e1d8e3d983c2366aa5d20884f03f.jpeg

I heard from the kid today, and extracted out of him that it was just a parts bike he picked up last week for the wheels. Which is funny, because the KFX80 was essentially the same exact thing, so we traded parts bikes. 

C109F447-D090-4F71-BBB1-7BE9EBA3CAC2.thumb.jpeg.b8cb51099dca440adb804cd13d54a46e.jpeg

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38 minutes ago, Hagbard said:

Imgur says it was the Yamaha tag, apparently there is quite a rabid fandom.   With such a low financial barrier to entry, I can see why they’re so popular.

Not just that but the blaster, warrior, banshee, and raptor are unique machines.  The only thing suzuki ever had was the zilla and maybe the king quad if all the gears make it unique.  Honda is the mediocrity and kawasaki the third wheel leaving polaris as the village idiot.

45 minutes ago, Hagbard said:

The oiler was long gone when this happened, there’s an aftermarket delete plate where the oiler should be, and it isn’t anything recent.

Maybe someone didn't know the oiler was disabled?

I don't know how else to produce that damage to the piston and bearings other than lack of oil.

Did you examine the sleeve for evidence of seizing?

39 minutes ago, Hagbard said:

Like, um... take my money.  I get a little extra gasket for the next go around.  Even at $145 it's a bargain made in China.

Like, what inflation???  lol

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27 minutes ago, JustRandy said:

Not just that but the blaster, warrior, banshee, and raptor are unique machines.  The only thing suzuki ever had was the zilla and maybe the king quad if all the gears make it unique.  Honda is the mediocrity and kawasaki the third wheel leaving polaris as the village idiot.

Maybe someone didn't know the oiler was disabled?

I don't know how else to produce that damage to the piston and bearings other than lack of oil.

Did you examine the sleeve for evidence of seizing?

Like, what inflation???  lol

Love the hierarchy of quad supremacy lol! It's funny because it's true. Yamaha is a consistent finisher in racing too. YFZ450's all day long. I see EVERY SINGLE TEAM at races driving around on a Honda utility quad between motos. No matter what bikes they ride, Honda is nearly ubiquitous as their go-getter. Speaks to reliability and not much else I suppose. 

My suspicion is that someone just grabbed the wrong gas can to fill it up. Shit happens. More often than not.  Sleeve looks clean like a broke-dicked dog. Just a little flash rusted. It looks like the piston was reused AFTER breaking rings. I bet someone re-ringed it, put on a new jug, and sold it cheap to some kid who failed to put premix in it. Just spitballing but it seems most likely.

My personal theory is that the Chinese are trying to undermine Japan's secondary market by flooding the zone with cheaply made products that fit well enough and cost 1/8th as much.  Law of large numbers. But I'm no economist. 

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49 minutes ago, Hagbard said:

Yamaha is a consistent finisher in racing too.

They have the 5-valve head.  Everyone else is stubborn I guess.  Or maybe it's like pro wrestling.

50 minutes ago, Hagbard said:

Honda is nearly ubiquitous as their go-getter. Speaks to reliability and not much else I suppose. 

Pretty much.  It's almost like Honda goes out of its way to not do anything particularly well other than always working.  Maybe being ok at everything but good at nothing is their shtick.

57 minutes ago, Hagbard said:

I bet someone re-ringed it, put on a new jug, and sold it cheap to some kid who failed to put premix in it.

So the piston fried in another jug?  Yeah that makes sense except at what point did bearings fall apart?

1 hour ago, Hagbard said:

My personal theory is that the Chinese are trying to undermine Japan's secondary market by flooding the zone with cheaply made products that fit well enough and cost 1/8th as much.  Law of large numbers. But I'm no economist. 

That sounds about right.  You have too much sense for an economist lol.

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This turned out to be a nice little score. Just happened to have a foil decal from that little sticker begging project that was a perfect fit ;) 

B66346BC-D375-41D1-A949-840BD3EE8956.thumb.jpeg.33e4622ef94effdce6cc4bfe9901b81d.jpegF76BB53A-8B15-4123-9A0B-5E3B54E31C4E.thumb.jpeg.5ac6eb5f932b61c2d19937b0f7e4a8bf.jpeg

Cleaned up pretty good with some Dawn and CameO polish. Have to grind down some bubblegum and see if they actually achieved penetration or if it’s just a bunch of crud sitting on the top of a fissure. There’s some evidence of blow by where the core mates with the can but a little work with a peen hammer and some decent rivets in place of junk drawer hardware should shore that up. 

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Repacked it last night, made a video with the GoPro to test it, and can’t find the cable, so pics will have to suffice. The sheer luxury of my workspace is breathtaking, I know.

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Rest assured they don’t do justice to the craftsmanship and materials choice. Once again I’ve selected the finest available repacking kit available in my attic.
0E1D7F7C-403F-4F26-8E6B-058D7BEF03F9.thumb.jpeg.25204e57562eea30a400d22a2b7db789.jpeg

I like to use the backer paper like a rolling machine to get the mat nice and tight 😂

I forgot to mention that I discovered the core was about an inch short of where it ought be, which was disappointing but not enough to rain on this parade of jury rigging. I found that the tailpiece from a bathroom sink drain is approximately the proper ID on both ends to accommodate the core, and the actual tailpiece of the silencer itself. Pretty much acts like a quiet core insert.
 

I think I should get extra points for that bit of ingenuity and/or frugality.
 

I don’t think it should amount to enough added back pressure to foil the efforts of the exhaust tuning, as I believe it’s well beyond the stinger and shouldn’t have much effect on power. 🤞

Edited by Hagbard
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I looked up the quiet core and it looks like it goes inside the pipe to increase resistance to exiting the pipe which gives the exhaust more time to quiet down.  I did the same sort of thing with my 250 by sticking the next size down pipe in the tail pipe.  The reduced diameter causes just enough backpressure to make it quieter.

But what it looks like you have is a pipe over the top of the other pipe which doesn't increase backpressure and you've covered half of the holes which seems like it would make it louder.  It will work but it might not be very quiet.

The muffler works by dumping energy into each of those holes as the wave moves along the length.  If you reduce the holes along the length, you reduce the damping capabilities.

The inserts can't go over top of other pipes because they have screens on the ends.

 

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