Cr500 High Compression Head, First introduced in 1984, the CR500
Cr500 High Compression Head, First introduced in 1984, the CR500 was Honda’s answer to the growing demand for high-performance, big-bore motocross bikes. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Since I'm a longtime CR500 rider, it didn't take long to notice that this bike will run hard from 1/2 to full throttle once revved up but there isn't much on the bottom. Trying to get a package deal, I'll let you know what happens. 0:1; and a new ignition has a maximum advance of 28 degrees at 5000 rpm (last year’s was 22 degrees at 4000 rpm) and a higher-output ignition coil. TSR CR500 Billet Head Kit fits 1989-2001 year models We have designed our billet head with a modified combustion chamber and integrated a high quality decompression valve which will bolt directly onto your standard cylinder. Suggestions : Swap chambers to adjust performance for a variety of riding conditions and track types or keep a spare in case of engine failure. i've been trying to solve my compression problem. Shop High Quality Piston Kits online at Wiseco with 89. The best selection, low prices, fast shipping, and great customer service. Milling . com for some good info,tons of good stuff there. 00 i had no choice but to try it out. 5 , ring end gaps are on the tight side and I cant seem to get more than 100 lbs cylinder pressure kicking with the throttle wide open. 00 Free shipping Honda Genuine 1989-2001 Cr500 Cr 500 Factory Oem Cylinder Head Top End New $131. 4cc Stock compression H51 - 64. com: Hey guys, have a "potential" problem. I experimented w/ 2 base gaskets and 2 head gaskets - 2 base did the trick w/o effecting the powerband. 84-86 were the fast years,they had the short rod wich is now unavailable. the compression tester new and i use it on my shee already . stock pipe is the best prforming pipe for cr500s!. I have the head milled to . Select model, year of your bike and your favourite specialty. com/ Huge thanks to Kincade Pavich. This will net approx 8. but i found dat it ain t had much compression when i try to start it . The 125/250 heads come with two replacable state-of-the-art combustion chambers for standard and high compression race gas applications. Increasing compression is the easiest way to make more power from the cr500. This instructional video was made to help the bike builder install the compression release kit onto one of CR Machine's "Fred Heads" I am now selling these h Hello, I am asking if , in reference to the standard Honda CR500 (1991 onwards) you have these data: 1) OEM squish 2) OEM head volume (in cc High CR 500-550 pistons anybody? I believe that if there’s enough interest, I could design a bolt on piston that doesn’t require all the above mods and could work with the standard gasket and yet provide high compression, good squish area and be ready to accept hotter cams. It's manufactured from a high quality alloy and o-rings are used for the sealing. 9:1 bgraley Posts: 149 Joined: Mon Feb 01, 2010 7:52 pm Last active: My 1989 CR500 engine I have in my AF (which I will post pics of when it is done) is freshly rebuilt. He said it had a wiseco piston and shaved head. NEW OE HONDA 1988-2001 cylinder head modified for compression ratio, squish clearance, bore size, and a button decompressor for $395 delivered by USPS Priority mail. Honda CR500 Phathead cylinder head kit 1986-2001 This model does not have the compression release Chamber selection: HN50 - 66. The matching carb jetting changes took longer. 5cc (100+ octane) H53 - 60. Manufactured from a high-quality alloy for maximum durability and heat transfer. Higher compression, decompression valve, polished combustion chamber and optional Cerakote finishes. This comes from a bike that has high compression stock and pinging issues. High Compression / Big Bore 91mm (+2mm) Cylinder Head. 8cc (110+ octane) Phathead Kits include a head shell with one combustion chamber, two sets of o- In 89-01 honda lowered the compression a lot. Should always check your P to H clearance before hand anyway. Hopefully tomorrow, or withi Regular rectifier appears to make an ignition kit complete with stator that has a 60 watt lighting coil for a CR500. 1) OEM squish 2) OEM head volume (in cc including spark plug thread volume) 3) OEM compression ratio 4) OEM piston height (at top dead center relative to cylinder top plane) Thank you. I FIND I HAVE SOME PROBLEMS WITH THE NEW CARB. 4:1 to 7. KPMI replacement compression release button for your Phathead cylinder head. i've added 3 head gasket and it's still hard to crank. Honda CR500 CR 500 Big Bore +2mm 91mm High Compression Head & Gaskets 1992-2001 Pre-Owned 11 product ratings - Honda CR500 CR 500 Big Bore +2mm 91mm High Compression Head & Gaskets 1992-2001 $119. Local Honda dealer said the cyl. go to cr500riders. Shave the head on the later models, and watch the horsepower grow. 4cc (95+ octane)HN52 - 62. i agree with the carb but have not sure of the cdi deal. We have a great online selection at the lowest prices with Fast & Free shipping on many items! IN THIS VIDEO I INSTALL THE NEW DECOMPRESSION HEAD AND START THE BIKE FOR THE FIRST TIME. 8:1 compression ratio for High Performance Engines Buy SKU 871M08900 from our store today! The compression ratio was lowered from 7. The design would be much more modern, slipper skirt style, thinner rings and a good deal less weight through shorter Break down of the CR500 compression release cylinder head from https://phatheadracing. Using the high CC's for the combustion chamber in the 250 I get a really high compression ratio while using the low CC's in the combustion chamber of the 500 cc engine I come up with a really low compression ratio. For more information contact us via WhatsApp or use the form. head's combustion chamber needed resizing. You can still see the the hone marks (cross hatch marks) in the cylinder from the fresh bore. KX500 and CR500 See compression release fitting for the brass fitting that the button threads into. Like all our other heads this design also comes in our unique bronze colour. 00 USD Our NEW CR500 2 piece billet head is 100% designed, tested and manufactured by TSP in Australia. The CR500 engine’s large displacement and high compression ratio contribute to its impressive power output. Its high-quality materials and meticulous engineering deliver superior performance and extended engine life. 9 to 2mm o Fits CR500. 86 head pictures 01 head pictures I will say this, this is the best low dollar mod i have ever done on a stock cr500 motor, . 12200-ML3-760 CYLINDER HEAD OVERBORED TO 91MM, CUT TO INCREASE COMPRESSION. Find many great new & used options and get the best deals for Honda Cr500r CR 500r 500 R OEM Head Decompression Compression Release Valve at the best online prices at eBay! Free shipping for many products! Honda CR 500 Heads Billet Heads Make no mistake this head is the forerunner and most others just try and duplicate its stellar performance I'd just use the highest octane non-ethanol pump gas available. Combined with the efficient carburetion and reliable ignition system, this engine configuration ensures a thrilling riding experience. We'll see how it turns out. You don't need high octane unless you milled the head, used a thinner head gasket or used some type of high compression piston. Available in 3 different bore sizes and 3 different stroke lengths. In this video, I show how to compression test a CR500 and I also discuss a common misconception about dirt bike compression. Motorcycle Cool Heads Kits Billet aluminum/CNC cylinder heads are available for the following applications. Get the best deals for Cr500 Decompression Head at eBay. PhatheadRacing Honda CR500 compression release chambers Chamber selection H50 - 66. anybody know how thick a 86 cr500 head gasket is? and what thickness is the best way to go to get more low-end? there is a company that makes copper head gaskets for the cr 500 and has about six sizes to choose from. Did the trick for the most part but still rattled a little under heavy load in high temps. 9mm of squish and then I have it CCed, to 72 or 73cc. 99 at Langston Motorsports! 'Performance VHM Cylinder head Honda CR500R 1989 - 2001 The world famous golden VHM head with exchangeable combustion chamber is specially developed for optimal power output during the whole race and has an improved water duct. In now have head work to hopefully take care of the pinging/compression issue and I going to give a Wiseco piston a shot. 99 shipping KX500 Compression Release Mod ACCU-START 202 RACING Makes 500 start like a 125 Finding a stronger low end through high rpm power, throttle response, and fuel efficiency yet retaining the same compression ratio with this simple head chamber alteration makes a huge difference in the overall character of your engine. 030 off the head of a stock engine is the cheapest most effective way to increase power on the 500 IMO. do not do this with pre 87 motors. I had them in my jet ski. It's manufactured from a high quality alloy and O-rings are used for the sealing. the piston comes up flush with the deck of the cylinder and assembled I get 1. after reading the thread about the compression release valve ACCU_Productors offer for $200. 1x O-ring is included. 1 month later. com (free version) Something I didnt do when I bought my bike, was get a compression reading from new. 00 MM bore and 6. eric gorr is a very established cr500 motor specialist. 5cc (100+ octane)HN53 - 60. He also has a CR500 dirtbike, I went buy his house to look at it and the front forks are toast and it has no tires or wheels but it runs, it about broke my foot trying to crank it. Honda CR500 1986-2001 Phathead cylinder head kit with compression release $700. for 91mm (+2mm) piston. My bike does in fact have porting, it is ported for high rpm and a has a rev pipe which originally made me want a CR250 ignition to use up more of the rpm range it is ported for. Just fairly recently got an 86 500, and although the previous owner said he had done compression tests and everything was good, I haven't had a chance to check it yet. 00 USD CR500 heads with altered compression ratios, squish widths and squish distances that are ready to ship out! (Actually 5 of the 6 have shipped since I took the photo) CR500 Billet Head Kit for 1989 - 2001 Year Models. I never had a sealing issue, but I pretty much swapped out the o-rings every time it was apart. 00 Compression release available for KX500 and CR500 Products are in stock ready to ship. Brand new cylinder head for Honda CR 125-250-500 dedicated to specialties that you intend to practice (Motocross – outdoor, Supermotard, Enduro, Rally, Supercross). The world famous golden VHM head with exchangeable combustion chamber is specially developed for optimal power output during the whole race and has an improved water duct. The Honda CR500 is a legendary two-stroke dirt bike that was king of the motocross world for over a decade. Buy the head as Honda designed or Boost torque, horsepower, and throttle response with MSV Racing’s Stage I OEM Honda CR500 cylinder head. It was quick 10 minute operation to swap out the domes. Great compliment to the Pro Design Billet Cool Head or VHM INSERT DOME HEADS for Honda CR500 CR 500 CR500R KX500 Quadzilla Suzuki RM500 Makes your Hi Performance OPEN CLASS BIKE engine start like a 125! Cr500, 91mm new nikiseal cylinder with new vertex piston, grampa george porting, high compression head with AN fitting, v-force reeds, custom 41. High octane burns slower at lower compression, so it can actually reduce performance. hi i have a cr 500 engine in a trx 250 and finally get a modification done to the kick start to start it . I cut 1 mil or . 5mm bored pwk carb, pvl racing ignition, bare/wing pipe with silencer, qrc motor mount and brackets, qrc chain guard, new throttle cable, new clutch Get the best deals for Cr500 Cylinder Head at eBay. Starting the CR500R will be very easy with the decompression valve. VHM cylinder head + insert kit for the Honda CR500R. Designed and made in Australia by TSR Products, featuring a modified combustion chamber, integrated high quality decompression valve along with a set of copper washers and titanium nuts. When I rebuilt my 350 Chevy I increased compression to bring up the cranking pressure up a bit - trying to get back some of what I lost due to the high altitude. It helped recover some of the lost power at 7000 feet. 1 O-ring is included. 86Honda250R 85Honda250R Sold 82Honda250R He also has a CR500 dirtbike, I went buy his house to look at it and the front forks are toast and it has no tires or wheels but it runs, it about broke my foot trying to crank it. In summary, the Vertex 22447 CR500 85-01 Honda CR500R Standard Piston Kit is a performance upgrade that delivers improved power and torque, enhancing the overall riding experience on your CR500R. I did a compression test and it is 145-150 PSI. Forged performance piston kit for your motorcycle dirt bike street bike Shop for the Vertex Replica Piston Kit for Honda 22447050 CR500 at DB Electrical. do some head mods and some porting. I,m fooling with an 86cr500 new sleeve , new short rod and new weisco 89. It features and integrated decompression valve, upright spark plug hole and comes in a choice of different compression ratios. i spoke with my machanic and another guy about this 200 big ones for the valve and they both mentioned about the compression release valve they use for the harley I had an old 84' CR500 that detonated like no tomorrow. 4cc (95+ octane) H52 - 62. ps: for motard use what squish and rc values do you recommend? Translated with DeepL. Buy VHM 1989-2001 Honda CR500 Cylinder Head and Insert for only $579. 00 + $24. Imo Wiseco pistons will hold up longer than cast, but proper machine work is mandatory. If you ever look at a 86 head and a 90 head the step on the inside of the combustion area is double the thickness on the later model CR500. This head boasts a raw, exposed finish that highlights the precision of its machining, coupled with significantly improved water ducting to keep your engine running cooler and harder, from the gate drop to the checkered flag. Fits CR500. I had a high compression set that I used when at altitude. 040" off the head. gasmask 06-24-2005, 02:39 PM For the record, this is what I posted over on cr500riders. One of the main benefits of the product is the replaceable combustion chamber which are available in a range of compression options. Did anyone do this, and if so what should the value be? What value The head is where you will get all of your torque, and make our motor run nice at 8800rpm, (stock is 6400rpm). Otherwise, the ’86 engine uses the same cylinder porting, pipe, carburetor and reeds as the ’85 version. 5cc Stock compressionHN51 - 64. so let me kno wa i m suppose Just curious what compression should be at 5000ft? Did a comp test today and was getting only 122psi. com. excellent condition high compression / big bore cylinder head. The 87 and later heads had the piston to head clearance to get away with it. The new kit for the CR500 will include an all-aluminum plated cylinder with a decompressor- head, piston kit and gaskets. For "unseated" rings is this reasonable? What would a "solild" "broken in" CR500 engine run in terms of compression? My AF project is running longer than VHM cylinder head for the Honda CR500R. ACCU-START COMPRESSION RELEASE HONDA CR500 Makes your 500 start as easy as a 125 $349. i get 90 psi i m at sea level . The CR500 has a huge combustion chamber, allmost 2mm this is insane. 5:1 compression, still safe for premium pump fuel stock is only 6. 8cc (110+ octane) $100. cnob, dfdqc, tupnz, hwtz8, ooc4d, tcdrn, 2f293l, kest, els7m, 9u0cu,