Thinking of buying a Yamaha WR450F? Most riders love them, a small percentage don't. This is a hopefully objective look at the WR450F, and to a lesser extent the WR250F, and helpful tips if you do wind up buying one.
Autocad architecture 2015 free download full version.
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- Top Ten Software Reviews
- Holley Carburetor Jetting
- Carburetor Jetting Guide
If you purchase the OEM Mikuni you must install the extra jets that come with the kit. VM 22 Performance Kit to adapt to a Predator 212cc Engine, GX200 and 196cc clones. This carburetor is mainly intended for use on mini-bikes, it can be used on go-karts with modifications to the throttle cable. Note: The OEM Mikuni carburetor uses our VM26 Air filter, the aftermarket VM22 filter will not fit opening.
In a nutshell, the Yamaha WR450F is a cheap performance dirt bike with a reputation for being a lot more bullet-proof than its competitors. First offered in 1998 at 400cc, it shared many components and design concepts with the YZ400F motocross model. In 2001 and 2002 the WR426F was released, then the third generation was the WR450F from 2003 with the bigger engine, smaller fuel tank and an electric start. Most changes since then have been minor, except for the alloy frame from 2007, and the 2012 model has gone to fuel injection and finally got the beefy suspension of the YZ models installed.
The WR450F is basically the YZ450F detuned slightly for more controllable power, with a headlight and lighting coil, softer suspension, a kickstand, lower noise specifications, larger radiators and lower emissions. The WR in the name indicates a wide-ratio gear box common to most enduro or trail bikes and stands in contrast to the close-ratio gearbox essential to a motocross racer.
Let's have a closer look at the pros and cons of the WR450F and WR250F. Click here for a WR450F video.
Motorcycle Carburetor Jetting Guide
GOOD STUFF ABOUT THE WR450F
* Tractable linear power delivery, plenty of free/cheap mods to turn into a screamer
* Electric start and kick starter
* One kick starting hot or cold once the bike is set up well
* Bullet-proof engine with comparatively low maintenance and long life
* Incredibly quiet exhaust system with range of possible mods
* Gets updated with all tested mods on the competition brother, the YZ450F
* No-tools air filter access
* Cheap readily available OEM and aftermarket parts.
* Tractable linear power delivery, plenty of free/cheap mods to turn into a screamer
* Electric start and kick starter
* One kick starting hot or cold once the bike is set up well
* Bullet-proof engine with comparatively low maintenance and long life
* Incredibly quiet exhaust system with range of possible mods
* Gets updated with all tested mods on the competition brother, the YZ450F
* No-tools air filter access
* Cheap readily available OEM and aftermarket parts.
PROBLEMS WITH THE WR450F
* Still only a five speed gear box (get with the program Yamaha!)
* Suspension will be soft for heavier riders, or really hard riding
* No handguards
* Bottom power is soft with quiet pipe, but it has a big hit.
* Woodruff keys were a problem on some 2003 models (read more here)
* Hard working on the carburetor with the bulky alloy frame on 2007+ models
* Still only a five speed gear box (get with the program Yamaha!)
* Suspension will be soft for heavier riders, or really hard riding
* No handguards
* Bottom power is soft with quiet pipe, but it has a big hit.
* Woodruff keys were a problem on some 2003 models (read more here)
* Hard working on the carburetor with the bulky alloy frame on 2007+ models
* Yamaha pinch pennies on their grease - regreaseyour head bearings, the swingarm bearings and the shock linkage.
YAMAHA WR450F & WR250F MODS & TIPS
Top Ten Software Reviews
GTYR DERESTRICTION KIT
Like all street legal dirt bikes, the WR450F comes restricted and you will probably want to make some, if not all, of these mods. GTYR sell a derestriction kit that includes a short throttle stop, AIS removal bits, new jets, and instructions for around $40. There are brilliant pics and instructions here. You can remove the airbox snorkel and enlarge the opening, but make sure this suits whatever rejetting you do on the carburetor (full jetting charts here).
Like all street legal dirt bikes, the WR450F comes restricted and you will probably want to make some, if not all, of these mods. GTYR sell a derestriction kit that includes a short throttle stop, AIS removal bits, new jets, and instructions for around $40. There are brilliant pics and instructions here. You can remove the airbox snorkel and enlarge the opening, but make sure this suits whatever rejetting you do on the carburetor (full jetting charts here).
What's the AIS? Air Induction System, an environmentally friendly thing from the 2005 models on. Removing it won't increase performance, but does decrease decel popping.
GREY WIRE REMOVAL
What about the grey wire? You can remove the grey wire to remap the ignition to be like the YZ450F. Apparently it makes no difference under 6000RPM but does increase the power above that. It is worth doing? Some riders claim they don't notice the difference, others do. Some find the WR has more than enough power with the other basic mods so don't bother. Instructions here. On the steel framed WR (2006 and earlier), it's on the right side of the frame under the tank in a 6-pin connector. On the 2007+, it's under the left side panel in the 6-pin connector. The best way to do it is to push the wire out of the connector using a small slotted screwdriver and then tape off the ends.
What about the grey wire? You can remove the grey wire to remap the ignition to be like the YZ450F. Apparently it makes no difference under 6000RPM but does increase the power above that. It is worth doing? Some riders claim they don't notice the difference, others do. Some find the WR has more than enough power with the other basic mods so don't bother. Instructions here. On the steel framed WR (2006 and earlier), it's on the right side of the frame under the tank in a 6-pin connector. On the 2007+, it's under the left side panel in the 6-pin connector. The best way to do it is to push the wire out of the connector using a small slotted screwdriver and then tape off the ends.
EXHAUST PIPE MODS
The stock exhaust pipe is incredibly quiet, and actually not that restrictive with basic mods. If your riding areas are anywhere near houses or picnic areas then it's well worth considering just doing basic mods to the standard pipe, and not bothering with aftermarket pipes that are inclined to shut down our riding areas. The first mod is to remove the end of the exhaust pipe, and remove the steel tube that reduce the diameter of the exhaust outlet. The WR is still quiet but considerable power improvement, so some riders just leave it at that (see photo here). Otherwise, you can trim down the length of the tube that goes back into the guts of the exhaust pipe.
The stock exhaust pipe is incredibly quiet, and actually not that restrictive with basic mods. If your riding areas are anywhere near houses or picnic areas then it's well worth considering just doing basic mods to the standard pipe, and not bothering with aftermarket pipes that are inclined to shut down our riding areas. The first mod is to remove the end of the exhaust pipe, and remove the steel tube that reduce the diameter of the exhaust outlet. The WR is still quiet but considerable power improvement, so some riders just leave it at that (see photo here). Otherwise, you can trim down the length of the tube that goes back into the guts of the exhaust pipe.
Next mod? You can buy the GTYR replacement exhaust tip which provides a wider diameter pipe for around $55. The bike will have a bark when cranked, but it still passes the 96Db stationary test. Plus you can always whip the stock insert back in if you need to ride in stealth mode near houses.
After that, you can either modify the internals of the stock pipe, or go for aftermarket pipes, but the WR will definitely be loud. One thing to consider, some guys simply like making lots of noise, but often the assumed extra power you are getting from aftermarket pipes is largely psychological - it sounds louder, so it MUST be faster. Dyno charts often show only a small increase compared to properly modified stock exhausts (plus unless you are in the top 1% of riders, extra power often makes you a slower rider except in a straight line drag).
SETTING UP THE WR450F AS AN ADVENTURE BIKE
Check out this video on mods for the WR450F as an adventure bike. Usually you don't bother adventure riding high performance dirt bikes due to the high maintenance needed with the extra miles ridden. But quite a few riders do these mods to the WR450F because the engine needs a lot less work than most. Here's a useful thread on adventure WR450F bikes, suggesting:
Check out this video on mods for the WR450F as an adventure bike. Usually you don't bother adventure riding high performance dirt bikes due to the high maintenance needed with the extra miles ridden. But quite a few riders do these mods to the WR450F because the engine needs a lot less work than most. Here's a useful thread on adventure WR450F bikes, suggesting:
* 15/45 gearing or similar for highway cruising
* Rekluse auto clutch for a usable first gear in gnarly territory ($450)
* Add a Jagg oiler or make an auxiliary oil tankfor less oil changes
* Dunlop D606 tyres or similar
Fit a DRZ400SM 310mm front disc and caliper adapter for road braking
* Adapt a Husky TE610E rear wheel for the cush drive hub (info here)
* Fastway Pro moto billet packs and fender packs
* Acerbis 6.6 gallon tank, or smaller Clarke tank
* HID headlight and/or auxiliary LED driving lights
* Repad the seat yourself, or get an aftermarket one like the SeatConcepts.
* Rekluse auto clutch for a usable first gear in gnarly territory ($450)
* Add a Jagg oiler or make an auxiliary oil tankfor less oil changes
* Dunlop D606 tyres or similar
Fit a DRZ400SM 310mm front disc and caliper adapter for road braking
* Adapt a Husky TE610E rear wheel for the cush drive hub (info here)
* Fastway Pro moto billet packs and fender packs
* Acerbis 6.6 gallon tank, or smaller Clarke tank
* HID headlight and/or auxiliary LED driving lights
* Repad the seat yourself, or get an aftermarket one like the SeatConcepts.
Let's face it, the WR450F will not make the perfect adventure bike, you need the extra engine capacity. But if you want to ride gnarly trails, but also do the longer trips then these mods will give you a surprisingly capable bike with low maintenance intervals. A major point is the five-speed gearbox which doesn't have very wide ratios, but a Rekluse auto clutch makes an incredible difference if you want to opt for high gearing but still do slow tough riding.
While we found the Rekluse EXP auto-clutch to be a great piece of equipment, we did run into problems with the clutch slipping in higher gears at lower revs. You can read our Rekluse EXP test, issues and problems review.
MOTARDING THE WR450F & WR250F
Like any dirt bike, you can have awesome fun with the WR on the road if you motard it. There is debate about whether you need a cush drive hub or not. Some claim the WR gearbox will not hold up with regular road use, although it's hard to find evidence for this. Read more about the cush drive hub debate here.
Like any dirt bike, you can have awesome fun with the WR on the road if you motard it. There is debate about whether you need a cush drive hub or not. Some claim the WR gearbox will not hold up with regular road use, although it's hard to find evidence for this. Read more about the cush drive hub debate here.
If you are on a budget, there are cheap Chinese motard wheels on Ebay for around $600 which should be fine for non-racing use. A great budget option is adapting cast wheels which also gives you the cush drive hub, click here for info on adapting Honda cast wheels.
If you are racing, or otherwise going to be giving the wheels a pounding, it's usually best to only look at the quality gear and fork out the big bucks.
RESIZING THE WR450F TO FIT THE TALL AND SHORT
Are you vertically challenged? You can raise the forks in the clamps and buy a lowering link for the rear from a place like Mountain Motorsports. Budget method, and it may affect yoru handling. Otherwise get a suspension shop to do it.
If you are very tall (e.g. over six foot) you'll probably feel cramped on the WR. You can fit bar raisers and high bend bars on the WR without needing new cables. You can repad the seat so it is higher (and more comfortable). Also, there's a very simple free mod you can do to your stock pegs to move them back and down a bit for a bit more room on the bike (here).
Autocad architecture 2015 free download full version.
This app provides, using weather conditions and your engine configuration, a recommendation about jetting and spark plug to use for karts with Rotax Max Senior, Minimax, Micromax, Supermax, DD2 or Junior, which use a Dellorto VHSB 34 carb to get the best performance.
In order to get the weather values, the application can use the GPS to obtain the position and altitude, and the network connection to get the temperature, pressure and humidity from the nearest weather station. Nevertheless, the application can run without GPS and internet connection, in this case, the user has to enter the weather data.
The application is made up of four tabs that are described next:
- Results: in this tab, the recommended main jet, needle position, air density and spark plug type values are shown. This data are calculated depending on the weather conditions and the engine configuration given in the next tabs. In addition, this tab lets to make a fine tuning adjustment to adapt to your concrete motor and carburetor.
- Weather: you can set the values for current temperature, altitude, pressure and humidity. The values of this screen can be manually set or can be loaded by the application reading the data from the nearest public weather station (from the GPS tab).
- Engine: you can set in this screen the information about your engine, carburator and track, that is, the FR125 engine type (Micromax, Minimax, Senior, Supermax, Junior or DD2), the spark plug brand used, the needle type, the float/pilot jet combo, the floats height, venturi (dell orto 12.5 or 8.5), oil mix ratio, airbox type (new or old model) and the track type.
- GPS: this tab allows to use the GPS to get the current position and altitude, and connect to an external service to get the weather conditions of the nearest weather station (temperature, pressure and humidity).
The application works with different measure units: inHg, mb, mmHg, hPa, atm for pressure, ºC and ºF for temperature.
If you click in 'More from developer' you can find the other karting tools from ISEnet:
- Jetting for Rotax Max Evo: the jetting app for new Rotax Evo engines.
- Kart Chassis Setup, that helps you set up your chassis easily, for all brands: CRG, Tony Kart, Maranello, Birel, Intrepid, Energy, etc.
- Other carburation apps for go karts:
+ IAME X30 & Leopard
+ TM KZ / ICC / Shifter (K9, K9B, K9C, KZ10, KZ10B).
+ Honda CR125 powered shifter go-kart.
+ Modena KK1 & KK1R
+ IAME Shifter, Screamer & SuperShifter
+ Yamaha KT100.
- Air Density Meter: if you don't find a specific jotting app for your engine, you can use this app to create jeting charts.
- Apps for MX bikes (KTM, Honda CR & CRF, Yamaha YZ, Suzuki RM, Kawasaki KX).
The app is valid for RGMMC (Rotax Max Challenge) or SKUSA, but is not valid for Rotax Max FR125 engines after 2015 (EVO model). For these engines, you should install Jetting for Rotax Max EVO.
We're working in new carburetion apps for other kart motors (LKE, Maxter, TKM, Vortex, WTP, etc.) and a new tech apps for Alfano / Mychron visualization. Please send us and email if you want to be notified when these tools are published.
ERRORS AND SUGGESTIONS:
Please understand that because of the variety of phones, android versions, etc. it's very hard to develop bug-free applications. If you find any bug, please, send us an email to [email protected] explaining the error that you've detected. We'll try to fix it or give an answer as soon as possible.
PERMISSIONS:
The application needs the next permissions:
- Your location: it lets the app get the position and the altitude using the GPS to know which is the nearest weather station.
- Storage: it's used for storing the config preferences.
- Network communication: it's used for invoke the external service which provides the current weather conditions
- Phone calls (read phone state and identity): it allows to get the system identifier in order to validate the license status of the installed application.
In order to get the weather values, the application can use the GPS to obtain the position and altitude, and the network connection to get the temperature, pressure and humidity from the nearest weather station. Nevertheless, the application can run without GPS and internet connection, in this case, the user has to enter the weather data.
The application is made up of four tabs that are described next:
- Results: in this tab, the recommended main jet, needle position, air density and spark plug type values are shown. This data are calculated depending on the weather conditions and the engine configuration given in the next tabs. In addition, this tab lets to make a fine tuning adjustment to adapt to your concrete motor and carburetor.
- Weather: you can set the values for current temperature, altitude, pressure and humidity. The values of this screen can be manually set or can be loaded by the application reading the data from the nearest public weather station (from the GPS tab).
- Engine: you can set in this screen the information about your engine, carburator and track, that is, the FR125 engine type (Micromax, Minimax, Senior, Supermax, Junior or DD2), the spark plug brand used, the needle type, the float/pilot jet combo, the floats height, venturi (dell orto 12.5 or 8.5), oil mix ratio, airbox type (new or old model) and the track type.
- GPS: this tab allows to use the GPS to get the current position and altitude, and connect to an external service to get the weather conditions of the nearest weather station (temperature, pressure and humidity).
The application works with different measure units: inHg, mb, mmHg, hPa, atm for pressure, ºC and ºF for temperature.
If you click in 'More from developer' you can find the other karting tools from ISEnet:
- Jetting for Rotax Max Evo: the jetting app for new Rotax Evo engines.
- Kart Chassis Setup, that helps you set up your chassis easily, for all brands: CRG, Tony Kart, Maranello, Birel, Intrepid, Energy, etc.
- Other carburation apps for go karts:
+ IAME X30 & Leopard
+ TM KZ / ICC / Shifter (K9, K9B, K9C, KZ10, KZ10B).
+ Honda CR125 powered shifter go-kart.
+ Modena KK1 & KK1R
+ IAME Shifter, Screamer & SuperShifter
+ Yamaha KT100.
- Air Density Meter: if you don't find a specific jotting app for your engine, you can use this app to create jeting charts.
- Apps for MX bikes (KTM, Honda CR & CRF, Yamaha YZ, Suzuki RM, Kawasaki KX).
The app is valid for RGMMC (Rotax Max Challenge) or SKUSA, but is not valid for Rotax Max FR125 engines after 2015 (EVO model). For these engines, you should install Jetting for Rotax Max EVO.
We're working in new carburetion apps for other kart motors (LKE, Maxter, TKM, Vortex, WTP, etc.) and a new tech apps for Alfano / Mychron visualization. Please send us and email if you want to be notified when these tools are published.
ERRORS AND SUGGESTIONS:
Please understand that because of the variety of phones, android versions, etc. it's very hard to develop bug-free applications. If you find any bug, please, send us an email to [email protected] explaining the error that you've detected. We'll try to fix it or give an answer as soon as possible.
PERMISSIONS:
The application needs the next permissions:
- Your location: it lets the app get the position and the altitude using the GPS to know which is the nearest weather station.
- Storage: it's used for storing the config preferences.
- Network communication: it's used for invoke the external service which provides the current weather conditions
- Phone calls (read phone state and identity): it allows to get the system identifier in order to validate the license status of the installed application.
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