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  Topic Review (Newest First)
05-19-2019 12:24 PM
orvilleortiz538
Quote:
Originally Posted by adam kinmond View Post
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.
Hey Adam sorry to jump in your conv here, I also sent some emails to the retailer from Ebay and they stated it was a 10:1 piston or 11:1 and it is 102mm but I was sketchy about the quality of the piston, I've heard of people buying the kit but using other pistons,so I'm going to go the route as well,I saw on one of your other post that the cylinder has a 700 sleeve,I was looking at L.A. Sleeves website but maybe I won't have to after all,what's a good Stator and CDI?

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09-21-2010 11:04 AM
MasterRaptor You can buy a 102mm CP 12:1 for $183. Have it fitted to your cyl for $80, and $50 for gaskets. Then you are way ahead. The chinese parts are not worth the risk of the hole in the cases. IMO.

One more thing....It looks like the oiling holes on the oil ring groove do not go all the way around the piston. Thats a problem!
09-21-2010 07:56 AM
blueranger660
Quote:
Originally Posted by adam kinmond View Post
the kit came in, looking for opinions on the compression ratio emailed twice asking the manufacturer and got two different answers 10:1 and 11:1?
based on the pics what do you think the compression is?
It's not an 11:1 piston, 11:1 pistons have more done and valve relief. It does look like a cast Made-in-China knock-off. As you said in a previous post:

"nothing ventured nothing gained. who knows this kit might be a diamond in the rough."
09-21-2010 12:59 AM
MasterRaptor Stock piston is dished. This one is flat, so I say 10:1. But, this piston is cast, not forged. It looks like a Chinese clone piston to me. I would not run that. Collateral damage can be very expensive. Send it back if you can.
09-20-2010 06:34 PM
Banshee2Raptor You can look at my build thread to see what I got, I took some pic's like you did. It's Banshee2Raptors 1st 4 stroke build, under 660 modification's. I have a 11:1 102mm Wiseco piston & what not..
Best of luck to ya, Chris...
09-20-2010 06:16 PM
willykiller
Quote:
Originally Posted by adam kinmond View Post
the kit came in, looking for opinions on the compression ratio emailed twice asking the manufacturer and got two different answers 10:1 and 11:1?
based on the pics what do you think the compression is?
Stock compression which is 9.2 to1...............
09-20-2010 06:08 PM
adam kinmond the kit came in, looking for opinions on the compression ratio emailed twice asking the manufacturer and got two different answers 10:1 and 11:1?
based on the pics what do you think the compression is?
09-14-2010 07:38 PM
adam kinmond when my rod snapped it destroyed the bottom of the cylinder liner, so to go with the wiseco piston, i would need a sleeve and bore and sleeve install, that would run almost twice the price. this guy on ebay has sold hundreds of these, i think i might give it a try and report back on quality and post up some pics of what i got. i cant see anything being wrong with the cylinder, the piston might just be crap, if so nothing ventured nothing gained. who knows this kit might be a diamond in the rough.
09-14-2010 07:24 PM
blueranger660
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.
09-14-2010 05:59 PM
dyce51 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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