686 kit - Yamaha Raptor Forum
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post #1 of 18 (permalink) Old 09-13-2010, 02:56 PM Thread Starter
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686 kit

looking at this 686 piston kit and wondering if anyone has anything to say about the quality. the piston is 11:1 compression according to the manufacturer.

http://cgi.ebay.ca/YAMAHA-RAPTOR-660...item41528db332

thanks

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 #2 of 18 (permalink) Old 09-13-2010, 03:20 PM
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Quote:
Originally Posted by adam kinmond View Post
looking at this 686 piston kit and wondering if anyone has anything to say about the quality. the piston is 11:1 compression according to the manufacturer.

http://cgi.ebay.ca/YAMAHA-RAPTOR-660...item41528db332

thanks
As long as your sleeve is in OK shape, No crack's & what not you can have it board to 102mm, 686. Then you can bye a piston of your choise .I went with Wiseco but thair are a bunch out thair.
Good luck, Chris..

[SIGPIC][/SIGPIC]01 Raptor 686R, Willykiller 3 Pluger...2nd build under construction
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post #3 of 18 (permalink) Old 09-13-2010, 03:27 PM
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I'm a little slow on the uptake today so I probably missed it, where was the 11:1 statement? I didn't see anything that stated it was an 11:1 piston, and if those pictures are the actual product I doubt it's more than stock 9.2:1 compression. The description reads forged piston, but that looks cast to me like the stocker.

Honestly that kit looks OEM....VERY OEM. Though I don't know of any 660 derived motor with a 686cc displacement that would be cast into the cylinder like that.

I guess I don't know about the quality. The nearly 4k positive reviews of the ebay member and the 99.7% positive rating is difficult to cast too much doubt on though.

Mike

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post #4 of 18 (permalink) Old 09-13-2010, 04:06 PM Thread Starter
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i was under the assumption it was a stock compression piston aswell so i emailed the vendor the question and he responded that it was a 11:1 compression. is there a way to tell by looking at the piston? if you look closley at the cylinder it says 686 cast in the side. i think this guy makes the cylinders and the pistons. thats why im curious about the quality and reliability. the price is to attractive to go any other route for a 686 kit.

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 #5 of 18 (permalink) Old 09-13-2010, 05:09 PM
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It's possible that the seller is using a stock photo. The price isn't that bad for a complete kit however, I would like to know who's parts are included (i.e. Wiseco, JE, CP) as well as the bore and hone. Send another message to the seller asking them to provide the brand piston and part number and ask if the cylinder was finish honed with that matching piston ready to install. If they do not provide a recognizable brand piston and did not finish hone the cylinder to your piston then take your time and shop around or have a local reputable machine shop bore and hone your cylinder to the piston of your choice.

2004 660/700 Hybrid Knobbie Class Drags
2007 YFZ Woods Bike, Trail Class Drags and ATV Rodeo
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post #6 of 18 (permalink) Old 09-13-2010, 09:25 PM
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It looks like a stock cast piston to me, I agree with the previous poster, the cylinder should be sized to the piston to specs of .002 to .003'' for clearance.............


686 three plugger with HV porting, 39 FCRS, Curtis Sparks exhaust, Dyna FS CDI
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post #7 of 18 (permalink) Old 09-14-2010, 02:43 PM Thread Starter
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i emailed the vendor and here is the response "These are aftermarket NYC pistons with machined HSUN cylinder. Parts are plug and play, piston is 100% aligned with cylinder, and cylinder is bored and honed."
never herd of the piston manufacturer, but i think HSUN makes those cheap atvs and dirtbikes.

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 #8 of 18 (permalink) Old 09-14-2010, 06:31 PM
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sounds uninformed a tid bit. seems uninformed even more due to the lack of information on the description on that listing. ask if its the actual pic or not. if so, maybe 102mm, stock compression maybe?
id stick to products from reputable manufacturers, just my opinion though.
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post #9 of 18 (permalink) Old 09-14-2010, 06:59 PM
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if your on a budget go with an 11:1 wiseco, and just get your stock sleeve bored out. If you find the right deal, this can be done under 200, but usually will run ya 250 or less once said and done
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post #10 of 18 (permalink) Old 09-14-2010, 08:24 PM
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Quote:
Originally Posted by dyce51 View Post
if your on a budget go with an 11:1 wiseco, and just get your stock sleeve bored out. If you find the right deal, this can be done under 200, but usually will run ya 250 or less once said and done
+1

Mic your cylinder (or have you machine shop do it) and determine which size piston you need. If the cylinder is in good shape maybe a good hone and a good 100mm piston will save you the over-bore charges. Otherwise, find a good deal on a Wiseco, JE or CP piston at 101mm or 102mm, buy it, take it to the shop and have the cylinder prepped for the piston you purchased. This way you have the luxury of stepping up to 11:1 compression like dyce said.

2004 660/700 Hybrid Knobbie Class Drags
2007 YFZ Woods Bike, Trail Class Drags and ATV Rodeo
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