Cr125 cylinder porting. There is a NOS available on ebay.
Cr125 cylinder porting SKU: 92900-08032-0E $ 2. And the same story the other way round: in the picture below we have the base of a 1990 Mugen (same as any 90-97 cylinder) where i put a 98/99 gasket on: Here i went on and modified (shaved) the cylinder to make it fit the wider 98/99 cases later on: Jan 30, 2017 · Just glancing at the YZ125 cylinder and you can see that it does a much better job of aiming the charge at the rear of the cylinder and keeping the velocity up, if you know a bit about air flow that is. There is no real difference betwen the years. My goal is to cast a new CR125 cylinder with more YZ125 like port shapes and hopefully correct the weakest part of the CR125. Posts. 8/13/2020. There is one or more forward-located exhaust ports, two or more side transfer ports, and one rear intake port called a boost port. Hondas could use a little help in the power department to say the least!-Cylinder porting stage 2, epoxy work-Head mods-Reed cage-Pipe and silencer combo-Set up notes on timing and jetting CR125 01-04 Mod Stage 2 | $1350 Dec 11, 2023 · As I get more and more in the two-stroke porting, I grabbed up this cylinder for a steal off of eBay. The history: I found a CR125 04 last Summer at Craigslist the bike was completely beat up and I started the rebuild. It’s hard to believe but like the cylinder this was the first 1974 cr125 exhaust system built by Pro Circuit. The mods Varner did were a lot like the ones that I see being done to the cr250. 50. Apr 1, 2008 · Any 76-78 CR125 cylinder will work. Jul 31, 2002 · u heard the 95 cr125 engines were the best around last year in motocross action scott sheaks mechanioc, takes a brand new cr125 and tears it down, splits the cases and matches them, and than takes the originall cylinder off and puts a 95 on it, i also hears that the 95's were the fastest years out of the cr125's, donmt get me wrong you can too make a cr125 fast but in stock form they are a Jan 21, 2025 · I've noticed on several vintage boards, people are asking about CR125 boost port cylinders. May 13, 2019 · Rear cylinder above intake port is stamped with 00F1T043 Reed block is a VF3 stamped with V301. But, I keep thinking that it would be even more fun to have the CR125 transmission from the engine that is all busted up. New 4-petal reed Sep 7, 2022 · 91-99 cylinders are hpp cylinders that all interchange as long as you have the correct head and piston, ( domed or flat top). As of what I see right now the 2002-2004 uses the same right case, means the Actuator from 2002 and 2003 will fit maybe the one from 2005-2007 as well don't know yet need to measure. Hone cylinder; Wiseco piston kit; Top end bearing; Stage 1 porting; Head mod. Feb 15, 2009 · Cylinder Bore Rebuilding with POWERSEAL NIKASEAL ceramic composite cylinder plating, deamond honing, port chamfering, exhaust bridge relieving, deck lapping, and cleaning: $200 (not bad!) CYLINDER PORTING, HEAD AND VALVE MODS: $100. New, larger air intake connecting tube. engine assembly. Joined. If you look at Moto Tassinari’s website or anywhere online, the V301 doesn’t exist. My first try at a pipe was with one off a 125. Oct 25, 2017 · A CR125 pipe for the year of your chassis can be cut and reconfigured to fit the MR cylinder, but don't expect much out of it as the MR175 wants a completely different design. My guess was the V301 was a generic for all CR125’s before the A and B came out. by Michael Forrest. 1. MOOSE RACING TOP END GASKET KIT: $20. The response is a huge improvement and the bike snaps to attention and is so much easier to keep on the pipe and yet it still revs and pulls. There is a NOS available on ebay Feb 1, 2014 · So if you place a 98/99 cylinder on 90-97 cases you will have some massive overlap. Hopefully, it will run great. The cylinder is all–again. 1987-1989 used the same casting, there were porting differences, 1989 had the best power. I'm talking to George about running the STIC on my '79 CR250, and my Mugen '76 CR125 as well. Pro Circuit machined the combustion dome to match the port timing. Needless to say it was time to grind away to achieve some top end power, making more peak Oct 30, 2015 · Anything from 90-99 will work as long as you use the 98 head. 247. 3. New cylinder porting shapes and specifications contribute to improved engine performance. Are you sure thats the right years? Oct 23, 2024 · The CR144 prototype is a hybrid of a 1989 CR125 with a 2002 CR125 exhaust port and a 2007 CR125 porting using an Advanced Sleeve with Millennium plating. In fact, was competitive with the rest of the 125s. 2. I had to bore my cylinder recently and I thought I would post pictures of the boost port to show the difference. CR550 HONDA MX BIKE OR DIRT KART. Honda CR125 Exhaust Manifold Mar 8, 2006 · A: Yes and no. Jan 7, 2023 · After about ~3 hours, lost a top end. Jun 29, 2014 · You may want to think about a 32mm Mikuni if you are just running a stock or stock/ported cylinder. 2 Stroke Engine Port Timing. Jul 16, 2008 · Crankcase stuffing is a process where the tuner lowers the volume of the crankcase by reshaping some of the case and transfer ports with epoxy. The rest of the recommended mods are basically specific porting specs for the stock cylinder, and setup for a supermini (big bore). Fins are larger than the 74-75 models and the bottom skirt is a lot thicker than the 74-75. Unfortunately I didn't took many pictures during the rebuild, however I made some changes when I rebuild the eng Jun 11, 2015 · He cut the base of the cylinder and cut the head and did his cuts to the cylinder. Dec 25, 2016 · Can you educate me on why a resleeved cylinder is bad and how it relates to jetting Aug 2, 2008 · The top of the cylinder apparantly has imperfections that can be fixed by taking out the studs and lapping it on a flat surface with medium grit sandpaper. Thanks to last year’s improvements, which included an all-new cylinder, revised porting, keystone ring-equipped piston, rotary flap power valve, six-petal reed cage, lower Jan 9, 2009 · Aparently a large CCV will lead to a lower pressure blast of mixture up into the cylinder via the transfer ports as the piston comes back down from TDC, so it makes sense that a lower CCV will give a larger pressure blast of mixture, therefore assisting with scavenging of the burnt gases out of the cylinder through the exhaust port (the pipe Oct 12, 2012 · Just bought a CR125 2004 and asking the same question. for race gas mix; Jun 19, 2021 · In 1990 Honda changed the cylinder, adding a Honda Power Port (HPP), so nothing from 1990 will fit. The head is from a 1999 CR125 and the piston kit is from a 2025 YZ144. Location. Initially I thought the cylinder was ok and just had alum build up from the melted piston, but trying to use muratic acid to wash the alum away, it appears there are some gouges below the plated surface. Probably the best cylinders are the 94-97 ones (as far as porting), just use your 98 powervalve on those cylinders when you make the switch for better low end torque. This was the first 1974 cr125 cylinder Mitch had ever ported! Pro Circuit built a custom exhaust pipe to match all the engine modifications. Whether you want more power in the trails or at the race track we can help. The best aspects of 5 decades of 125s! Available late 2025. It melted the piston near the exh port. For a locked right wrist rider, they can work very well. porting 2 stroke. They only make the V301A (for 87-2000 models) and V301B (for 2001). Honda CR80/85 Cylinder & Head Stud. Send us your cylinder with your build info and we will come up with a custom port layout for you. The 2004 Cylinder provides enough room to add the tie rod and the Valve arm on the right side. (2) The exhaust pipe has been reconfigured to work with Honda CR125 Parts available in Aftermarket and Genuine, Stock Parts. . 00. I have been told that a 1978 cylinder has better porting specs and makes more HP but I have no way to confirm that. Eric even put in a booster port in the back of the cylinder to work with a port he made in the piston. Many people think that the 75 cylinder with the rear transfer port is a boost port cylinder. Mitch Payton ported cylinder. TOP END BEARING: $10 This posting is for MacDaddy Racing cylinder porting services on your Honda CR 500. Cylinder head reconditioning. This creates a stronger vacuum to pull the gas mixture in, raises primary compression, and allows the fuel mix to flow at a greater velocity. Nov 5, 2009 · Just got the cylinder back today and it is a work of art. CR125 05-07 Mod Stage 2 | $1350 This combo is truly incredible for a 125cc engine at an even better price. An engine "port" is an open window in the cylinder wall for the receiving or expeling of fuel mixture (air/fuel). I NEED MORE! CR125 Stock Top End Kit $219. I raced a friends 74 CR125 that was a rocket using crazy porting on a piston port cylinder and a 34mm but it HAD to be pinned 150sx cylinder porting? dbx33. If you go with a 32mm, let me know and I will dig up my specs from when I used a piston port set up with mild porting. Where is the best place nowdays to send a cylinder off to be Nov 3, 2014 · I have also ridden early CR125's without a reed with crazy porting for a piston port only design and they are screamers. Dec 6, 2014 · Hello all, I was asked to setup a new topic regarding CR125 Tuning. That is not entirely my style, so the reed offers a lot of off-throttle and mid-range responsiveness you will never see on a piston-port only set-up. Ken OConnor Racing is now offering porting templates for most ATV's, Snowmobiles, and Watercraft! May 18, 2000 · HERE’S WHAT’S NEW ON THE 2001 CR125. 91 and 92 are domed I believe, and the rest are flat top, some minor changes to port timing but they will all work and actually your power valves and guides from the 99 cylinder are the ones to run in the older cylinders as they seal up tighter at low rpm, as for the Sep 23, 2020 · The 2005 CR125 was much faster than the 2004 model. WISECO PISTON KIT: $85. jwvllk przvhtw cwepxa qwn sxofg gmx ehs lfevsi zfcgp gbhh