Includes 1 piston, 1 ring set, 1 wrist pin, and circlips if oem piston is dual ring then the spi will also be dual ring tmoly pistons with teflonmolybdenum coating. My bigbore pistons are so much heavier than the stockers to begin with, and the rigs make their hp a good 800 spins slower. Nothing wrong with oem pro x same as oem made in same oem factory in japan but to pro x specs wossner best forged pistons in the world vertex great cast pistons fancy coatings but i think only come in one size a. Sep 03, 2002 last week i spoke with a local machinist who caters to the motorcycle market. Idk what the quality of pro x pistons is but when we dropped off my friends cylinder to get bored to his new prox, prox has their own spec for boring their cast pistons that is substantially different from stock cast boring sizing. Nov 14, 2014 the only 125s i still have are bigbores so the weight of stockers vs wiseco was pretty much a moot point on the smaller rigs from the start. I have nothing but bad things to say about spi and the person on ebay that sold me these spi pistons some where along the line, either the ebay seller or spi marketed or made these pistons wrong, first of the bottom of the skirt is much bigger than the other side on the stock 700 cfi piston, the spi piston skirts on each side of the cut, if. Prices displayed on this web site are exclusive for online orders and might be different in store. The thirdparty software that comes with your digital camera, graphics tablet. Forged slugs cold slap there asses off, then when they get warmed up there ok. Sep 28, 2019 yes the 2015 pro pistons have a better lock on the ring locator pin than the 1618 axys pistons. Spi sm09259 arctic cat piston kit standard bore 85.
Spi piston alert american snowmobiler magazine snowmobile. Well compare wiseco pistons with oem pistons on the honda crf450r and a honda trx420. I run spi cast pistons on my 700rmk sled, they are ceramic coated and they seem to hold up really well for having over 150 hours on them. Forged pistons, on the other hand, are a different story. Seizing on the exhaust side is caused from a lean mixture or air leak. Arctic cat oem cylinder spi pistons gaskets 1017 98b4 m8 m800. A wide variety of oem pistons options are available to you, such as turkey, none. I have a little over 30 hours of time on the wiseco and the skirt coating is all worn off. They are 22 g lighter then stock and have the oil groves on intake and exhaust. Spi is a distributor and fabricator of acoustical products and systems. Most stock machines call for a 91octane nonethanol fuel to maintain the. Reliability kit wich one to use polaris snowmobile forum.
Check out our parts catalog for personal water craft and jetskis. Jun 22, 2006 i also tried them in my 700 improver and broke a ring. Parts for dirt bikes, atv, pwc, jetski, snowmobile, karting. Rings are not as good as any of the oem s but the piston itself is on par with oem rotax, as good as suzuki cat.
Als snowmobile parts warehouse used parts are us 1964 to present 3868 pine hill rd newport, vt 05855 802 00 24hour fax. The best pistons for a recreational pwc engine is the oem piston. Dec, 2016 give indy dan a call, he can fix that for you, i have done all of my machines starting with my 07 700 dragon and 2 sons have 2012 and 2015 800 pro rmks and my 11 pro rmk 800 and daughter in law 800 dragon so i dont expect to have the pistons and exhaust valves come together any time soon. Jdm integrar pistons are also an excellent choice for bseries engines. Yamaha has art make their pistons to their specifications.
The spi s are cast so dont expand as much similar to stock cast pistons and you dont have that issue with them in the 800, 700 and 600ho nicasil doo bores. From what ive seen most of the aftermarket piston failures are caused by running a new piston in a worn cylinder. If i recall, the tolerance needed to be larger than stock. Space age aluminum alloy maintains high tensile strength up to 700 f. Includes 1 piston, 1 ring set, 1 wrist pin, and circlips if oem piston is dual ring then the spi will also be dual ring. We use only oem honda piston ring sets w our pistons. Wiseco piston benefits benefits of forged pistons forged vs cast. If your just going to do a standard top end job, just order 1 size over piston. The piston itself seems ok, just the rings are junk. Spi, sm09279, 2 piston kits most 20112016 polaris 800. Made from spaceage aluminum allow which maintains its high tensile strength up to 700f, which is 50% higher than a conventional cast piston.
I was just asking for other peoples expirence on using the two different types of pistons. I got a set of spis and just comparing them to the oems there was no difference at all the casting on the bottom side of the piston was identical and everything. Now you can have higher compression by swapping your old slugs with these jdm honda oem pistons. Whereas you would think that if the wiesco or other aftermarket pistons were so much better the oem s would use them instead. I run wise in my mods but stock spi hold up just fine. Piston failure is caused by the piston clearance in the cylinder being illfitting and loose. Mar 02, 2017 with pistons that you have in japanese 2 stroke engine suzuki, yamaha ive seen a lot of oem polaris piston with problem the top of the piston top ring groove most beetween 6000 to 0 km. On a side note, know lots of guys that have used spi with no problems as well. I always use oem pistons, havent had a problem yet. Oem s dont just use cheap stuff in their bikes to make more money, they use certain parts because they are best suited for the what the engine was designed for. Question one i will be replacing the stock pistons because original polaris pistons break. Episan, gilardoni, tecomec and meteor all have good products. The next step in the evolution of high performance powersports pistons.
Ive seen more failures in the dragon, pro era sleds using spi, wiseco, rk tek, prox pistons than with oem. Oem polaris will take 4 or 5 wacks wiseco you can beat the hell out of them and they bend. I ride my sled hard, so i whant to keep it top notch. Not many miles on em at 1500 for the season but i did run em in my former zr900 for well over 10,000 miles, pistons came out looking more like 1,000 max. A forged piston should be heatcycled before it can be run hard, or youre playing roulette with your engine.
Nothing wrong with oem pro x same as oem made in same oem factory in japan but to pro x specs wossner best forged pistons in the world vertex great cast pistons fancy coatings but i. The wiseco forged pistons are structurally stronger and lighter then the cast oem or spi pistons, but they also melt sooner due to excessive temperatures if you are running advanced timing. Weisco would be a good choice if your going to punch out your cylinder to match it with a new piston. Baileys latest line of top end kits are keeping the tradition of replacing both piston and cylinder for one reasonable price. But my guess is that they are oem pistons that didnt come 100% into specs and were rejected for weight or. We provide acoustical solutions for a broad range of commercial, industrial, multifamily, marine and oem markets. How to prevent snowmobile engine failure snoriders. This higher temperature resistance significantly improves fatigue strength and impact toughness. Our broad range of highperformance piston rings covers a global variety of air and refrigeration compressor applications. Oem piston rings premier choice for oem applications. When pro x, vertex, je, cp and others talk about a, b, or c, they are talking about. The only 125s i still have are bigbores so the weight of stockers vs wiseco was pretty much a moot point on the smaller rigs from the start.
From cranks, stroker kits, rods, and pistons to valvetrain and more. Bseries engines can take advantage of the civic typer piston s high profile dome and increase compression. Unfollow spi piston to stop getting updates on your ebay feed. Even new oem pistons have problems in worn cylinders. I know wiseco pistons are very popular for kdxs so i was surprised to hear this. Spi piston kit for 500cc arctic cat snowmobiles fits. Last week i spoke with a local machinist who caters to the motorcycle market. Cast pistons dont require much in the way of special breakin, thats part of the reason they come as oem equipment in twostrokes. Reduce friction, resist seizure, and improve durability.
Temperature resistance is 50% higher than conventional cast pistons. But my guess is that they are oem pistons that didnt come 100% into specs and were rejected for weight or dimensions but i never had problem. I got a set of spi s and just comparing them to the oem s there was no difference at all the casting on the bottom side of the piston was identical and everything. Oem s use these type pistons in stock bikes for a reason. Ill just resell the spi pistons the guy off of ebay wont take a return and unfortnately i already left him postive feedback, i hate to do it but im gonna have to buy the wiseco pistons, they are still cheaper than the oem quote i got. Prox racing parts supplies genuine replacement products which meet or exceed oem quality. With hastings, you get the size you want, the volume you need, and the quality you expect. As far as wiseco goes,, its a good piston and an acceptable alternative but dome roll. Spi pistons, spi piston kits, snowmobile pistons hi. Parts come outta the box looking more like jewellery vs a set of pistons. I use the oem rings but the spi piston, save literally hundreds of dollars per top end. Each piston kit consist of one piston with ring set, wrist pin and circlip set. Took measurements today on spi piston vs axys piston in 3 different. Most oem s will publish wear limits for their cylinders but some ignore this.
I think the oem rings in the spi pistons would be fine. Oem stands for original equipment manufacturer and oem software is a phrase that refers to software that is sold to computer builders and hardware manufacturers oems in large quantities, for the purpose of bundling with computer hardware. The spis are cast so dont expand as much similar to stock cast pistons and you dont have that issue with them in the 800, 700 and 600ho nicasil doo bores. Oem have tighter tolerances than a off the shelve weisco. And wiseco and oem still do offer overbore sizes, but on limited models. Chevrolet chevy small block gen iiiiv lsbased engines. Spi, 09817n, 2 piston kits 19871993 yamaha exciter 570. This is just a short list of what is available, email more top end kits. Even though the aftermarket equivelent, made by the same company that made the oem product is very good quality, it is not the exact same part. Most oems will publish wear limits for their cylinders but some ignore this. Manufactured by spi oem style piston kits includes. Dynotech research motorcycle and snowmobile dyno testing.
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