Category Archive Yz125 squish

ByMesar

Yz125 squish

It is our most asked about kit for the YZ and it has been for many years. This kit is very popular with Vet racers of all levels and works well no matter how you ride it.

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It can be lugged like a or screamed like ait does both equally well. Put a flywheel weight on it and it is one of the best woods engines you will ever find. It is so much fun and completely un-detectable by looking at it from the outside. However the exhaust note WILL give you away. This is a complete engine build. It requires you to send us your YZ engine and we will modify it to a YZ Head: Re-chambered to work with the custom Wiseco Big Bore piston and stroker crank.

Blueprint: Calculate deck height, squish clearance, trapped volume, port timing and compression ratio and list on your personal Spec-Sheet. Notes: This kit requires you to send us your entire engine for modification with kick starter and shifter. Notes: Prices listed are to install stroker kit parts in good condition engine.

Should your engine need rebuild parts there will be additional charges. We will call for approval before we install any parts that will have additional charges.

If you are looking for a budget bike build up the best years for this mod was followed closely by Current. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Submit a Comment Cancel reply Your email address will not be published. Search for:.What's new New media New media comments Latest activity. Media New media New comments.

What's new. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Hi Which 65cc 2t are the most reliable? Latest: Vladislav Yesterday at PM. I need my moto fix! Latest: Johnrock Monday at PM. Latest: Divouneh Sunday at PM.

YZ250 with fresh Vertex piston & .045" squish starts by hand

New Member? Go here first. Saturday at PM. Yamaha 2-Strokes. Womens Motocross International Latest: mxchickalltheway Apr 3, Kawasaki 2-Strokes. Getting hard to start!! Latest: Mohawk Warrior.

yz125 squish

Mar 30, Apollo cc gas in oil Latest: Rich Rohrich Mar 28, Rmz leaking oil out of head bolt Latest: Pete Payne Mar 27, Flat Top Piston for a YZ Thread starter 00kawa Start date Oct 4, Oct 4, Joined May 16, Messages 32 Likes 0.

Where can I get a flat top piston for a 01 yzThere are no "set-up" concerns, no reliability concerns. Our "Hemi" design utilizes tighter squish clearances and a narrow squish band which will increase combustion efficiency and produce a more centralized push on the piston, thus increasing power. End gases will NOT be trapped in the squish band where they can't contribute to the power process.

yz125 squish

As the season winds down, I wanted to drop you a note of thanks and mention how satisfied my riding buddy Mike and I are with the dual ring piston rebuild we implemented on our ss engines along with your billet heads. Our ss engines have never sounded or performed better We started slow, way on the fat side We had a short 6 week season here in Eastern Ontario, Canada but I enjoyed every mile on the new pistons.

What a difference in performance over the OEM pistons. I purchased and installed one of your drop in kits for the Polaris dragon. The cooling is at least 15 to 20 degrees cooler than it used to run and I needed to install one step hotter plug. The throttle response is amazing.

It develops power way sooner than before and holds torque all the way through to top shift at about or RPM. He liked the way it pulls hard all the way from about RPM or so.

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I am recommending your product to all my Polaris rider friends. RK Tek sets itself apart from other performance shops by testing its products in the best lab in the world - the great outdoors. Yes, that's right, RK Tek draws results from "real world" testing. Gen 4 Present Cylinder Porting Services. Patriot cc Patriot Big Bore.

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Honda Cylinder Porting Services. Drop-In Kits There are no "set-up" concerns, no reliability concerns. Browse all. Billet Heads Our "Hemi" design utilizes tighter squish clearances and a narrow squish band which will increase combustion efficiency and produce a more centralized push on the piston, thus increasing power. Browse All. Latest Featured. We do not supply the cheater head. Model: Please Choose cc cc. Year: Please Choose I decided see which simple mods could help this Yamaha YZ two stroke the most in order to get him some extra ponies.

These modifications aren't supposed to drain your wallet, but instead will give you the most bang for your buck.

Aden needed to graduate from an 85 up to a bigger machine, but needed a bike that could handle well yet be fast enough to pull him around. Here are six very simple mods that we have done to the YZ in order to get more horsepower, but also keep reliability as well as some money in my bank account.

yz125 squish

The FMF set up doesn't provide more over-rev over stock, but you will notice a healthier second and third gear pull down the straights.

I like that the FMF pipe comes with o-rings already installed and is ready to put on. The faster the track, the more this combination shined. Unlike their popular C12 two-stroke fuel, T2 is oxygenated in order to create more power. Recommended for either stock or modified two strokes, the VP Racing Fuels T2 comes premixed at a ratio and is ready to pour right out the can. T2 contains no ethanol, which can help the engine parts in your YZ last longer.

The octane rating helps prevent against detonation, especially in high compression engines and works well with the Apex head. VP T2 gave the YZ better throttle response and a stronger bottom to mid range pulling power. The V-Force3 system gives the Yamaha increased power, throttle response and also allows the Yamaha to rev farther than that of the stock reed cage system.

The V-Force reeds also last longer than the stock reeds and resist chipping much better. Apex Technical Innovations Cylinder Head: The objective of the Apex cylinder head is to improve upon the OEM combustion chamber shape to get more efficient combustion, while also offering interchangeability, as well as additional cooling from the billet design.

A very important parameter of cylinder head design is the squish clearance.

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Because of manufacturing tolerances, the stock YZ head has a pretty large squish clearance for a at around. The point of the squish band is to shield and cool end gasses from the flame front to prevent detonation and to add turbulence to aid mixing and make for more efficient combustion.

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This can cost you power, fuel efficiency, and make jetting more finicky. Also the flame front can creep into this space and actually cause detonation. The Apex YZ head is designed to have a nominal squish clearance of. The msv is the speed which the fuel air mix moves across the squish area into the combustion chamber and is another very important tuning parameter.

Too high and the engine will be too peaky and risk detonation and too low and the engine will need excessive advance to run right and will be slow in general. The msv, compression ratio, squish area and squish clearance all affect each other, so a lot goes into getting the right combination. Another unique problem that the stock YZ has is the way it has a flat top piston with a large bevel on the side.

This makes conventional head designs not pair well with it. Normally one would have to choose an angle to match either the bevel part, or the flat part which leads to a compromise in how the squished gasses are dealt with. This way all of the fuel gets properly burned and you avoid detonation near the cylinder wall.

This gives broad snappy power and a boost in power throughout the entire front side of the power curve. My son is only pounds so having him carry third gear through corners wasn't a problem with the Apex head design. Aden is more of a lugger four stroke rider than a revver and this allowed him to carry second and third more.Portal Forums Photo Gallery.

Re: yz setup tips. Mainly motocross i want to start racing it has already got a fmf shorty pipe and boyesen reeds. I can't help a whole lot with the MX setup but I'm sure someone can. They'll probably want to know what type of track; MX, outdoor SX.

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Is it 40ft tables or 90ft triples? Also what type of track conditions; sand, loam, hard pack? Check your spring rates against the one at RaceTech Set your sag - should be mm and if you have the right springs you shold have around 25mm static sag. Hopefully that will get you started. Just setting your sag and clickers can make a huge difference. Here's some tips and some of what mine likes If you have not had your boingers serviced, start there. They certainly need it by now.

Make sure that you have the right springs in it for your weight.

YZ 125 custom engine mods

Keep your fork oil height very near to stock. Maybe if you're heavier or if your lighter. Sag at 95mm. Faster tracks I'll go or more. Fork tubes at stock hight in clamps. Tracks with some really tight slow turns I'll raise them in the clamps 5mm and go 95mm sag. One tooth up op on the rear sprocket.

Stock is 48, go to Jet it. No one can tell you what to run. It has to be done on site. Put the power-valve governor spring in it. Cheap part from local dealer. Measure your squish. Tighten it up to about. There's plenty of info how to measure it and have your head machined to tighten it up.What's new New media New media comments Latest activity.

Media New media New comments. What's new. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Hi Which 65cc 2t are the most reliable? Latest: Vladislav Yesterday at PM. I need my moto fix!

Latest: Johnrock Monday at PM. Latest: Divouneh Sunday at PM. New Member?

Flat Top Piston for a YZ125

Go here first. Saturday at PM. Yamaha 2-Strokes. Womens Motocross International Latest: mxchickalltheway Apr 3, Kawasaki 2-Strokes. Getting hard to start!! Latest: Mohawk Warrior. Mar 30, Apollo cc gas in oil Latest: Rich Rohrich Mar 28, Rmz leaking oil out of head bolt Latest: Pete Payne Mar 27, Is this a stroked yz kit?

Thread starter yzroadracer Start date Oct 22, Oct 22, Joined Sep 24, Messages 4 Likes 0. The rod says hot rod on one side and c. The piston is a racers choice flat top conversion forged acording to wiseco site.

Joined Nov 3, Messages Likes Sounds like a stock length rod to me. If it were a stroked crank the pin in the crank would be opffset. Take a few measurements like Deck heightsquish clearanceand the step in the cylinder head and I can probably help you figure it out. Oct 25, I know this is a athena kit and im positive the gasket is.We offer a single design for the YZ head.

It has a similar compression ratio to the stock head, but with a much better design. Squish clearance is tighter than stock and the design is much more detonation resistant than the stock head. It offers improved power throughout the rev range and makes a great bike even better. They are the best bolt on mod you can buy for your bike! Our design offers better heat dissipation than many other 2 piece designs due to the large lower section which incorporates the combustion chamber… this allows heat from combustion to disperse over a larger area than other 2 piece designs for improved heat transfer to the coolant.

These CNC heads will bolt onto your standard cylinder and are designed to work with standard base gaskets. If you are unsure of your current base gasket thickness we can advise the correct thickness to achieve the necessary cylinder height and squish clearance.

We can also advise baseline jetting specs to go with your new CNC head. The customer takes all responsibility for ensuring that jetting is appropriate for their riding style and conditions. We are currently open for business and trading normally!

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Zologal Posted on10:12 pm - Oct 2, 2012

Ich entschuldige mich, aber meiner Meinung nach irren Sie sich. Geben Sie wir werden es besprechen. Schreiben Sie mir in PM, wir werden umgehen.