Niche 686 big bore kit. any good? anyone heard of them? - Yamaha Raptor Forum
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post #1 of 11 (permalink) Old 06-01-2012, 10:54 PM Thread Starter
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Niche 686 big bore kit. any good? anyone heard of them?

Has anyone heard of this company or used this kit? I was curious is its a pos or not. Input would be great!
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post #2 of 11 (permalink) Old 06-02-2012, 09:13 AM
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Never heard of it, have a link?


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post #3 of 11 (permalink) Old 06-02-2012, 09:43 AM Thread Starter
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post #4 of 11 (permalink) Old 06-02-2012, 09:54 AM
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Never heard of them. Not a bad price on though.
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post #5 of 11 (permalink) Old 06-02-2012, 10:56 AM
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Not bad price, but I'd want a higher compression, personally. As stated above, though, I'e never heard of the Niche 686 offering though.

'01 Raptor 660: 101mm 11:1 Wiseco, HCII, P&P, Curtis Sparks Exhaust, ProFlo w/ K&N, ACE Fabrication +2+1, JTM, G-Force Extended Axle, Holeshot HD, Holeshot XCR, Haulers, ProTaper SE Raptor Bend, ProTaper Pillow Top Grips, ASV Clutch Lever

'07 Raptor 700: 11.5:1 Tech, X4, Bo White +1 port, +3 TB, Curtis Sparks Exhaust (shortied), FCI w/o box, PC3, FullFlight +2+1, G-Force Extended Axle, Holeshot HD, Holeshot XCR, Haulers, Fasst Flexx, OURY Grips, ASV Shorties, Jogaca Suspension work
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post #6 of 11 (permalink) Old 08-07-2012, 09:32 PM
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i got this same kit on ebay. the piston compression is stock, not 10:1 like advertised. the piston is a flat top just like stock. the good news is that this cylinder has the 700 sleeve in it making it stronger that a stock cylinder boared out to 102mm. with that said your cases are going to have to be machined for the larger od of the sleeve in the cylinder. i have been running this for about 2 years now and no problems yet.
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2002 Yamaha Raptor 686
YZF 450 front shocks
Full Flight +2 +1 a-arms
Durablue extended axle
Curtis Sparks full exhaust
DG nerf bars / GYTR Heel guards
Ferra stainless valves
X4 cam
12:1 JE piston
hot rod connecting rod
Dynatek Programmable ignition
Yukon transmission gears
Willykiller oil mod
12/39 gearing
dynojet needle in 3rd position from top
25 piliot 2.5 turn out
160 mains
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post #7 of 11 (permalink) Old 08-07-2012, 10:20 PM

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Hey Adam,

I'm guessing by your location that you ride in the Ganny?

Have you had any problems with the new sound laws with your Sparks exhaust? I just picked up a Sparks for my 700 and wanted to see if they are testing all the time for sound levels? I am going to pick up a quiet core just to be safe, but that only takes it down to 99 db.

Maybe we can meet up one weekend and hit the trails?

/ Thread Hi-jack

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post #8 of 11 (permalink) Old 08-07-2012, 11:27 PM
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That looks like a stock oem yamaha cast piston to me.

2003 Limited Edition Raptor
Kenz 720cc 11:1 stroker, +1 valves, Mega Cycle X-4 Cam, Sparks 6x Big Core, Keihin 35mm FCR's. 158 mains, 52 pilots, fuel screws 2 turns out.

97 Banshee
F.A.S.T. Dune Ported 4mill, CPI Inframes, Keihin PWK33's, Direct Drive Lockup. 158 mians, CEL needles second clip, #48 pilots, air scews 2.0 turns out.
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post #9 of 11 (permalink) Old 03-25-2019, 03:38 PM
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I just got a 2001 Raptor 660 with the second gear out. So had dealership fix that and picked up a 686 ebay bore kit for $101. So they fixed gear and put kit in. Plus they said they had to rejet my carb three sizes larger for the bore kit. Raptor been running like a champ!!
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post #10 of 11 (permalink) Old 04-01-2019, 10:59 PM
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So are the big bore kits on ebay anygood? cracked my cylinder head and want to get one off of ebay
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