It’s no secret that not everybody who buys a 250cc four-stroke is proud of it. They thought it appeared like the right bike—mild, high-revving and a barrel of enjoyable. However, after a number of races, they realized that they aren’t 250 four-stroke materials. Perhaps they’re too heavy, too timid or too sluggish, however both method, they’re disillusioned with the all-out dedication that a 250 requires and the necessity to maintain it on the pipe on a regular basis. They want that that they had bitten the bullet and purchased a KTM 350SXF or Husky FC350 like their buddies recommended. It’s too late and too costly to make the change now, so they’re caught with the 250 till their wives says they will break the financial institution once more.
THE CYLINDER WORKS KIT STARTS WITH A BRAND-NEW CAST CYLINDER WITH A NICKEL SILICON CARBIDE CYLINDER SLEEVE THAT COMES PRECISELY SIZED AND HONED, GIVING YOUR ENGINE GREAT RING SEALING AND CYLINDER-WALL LONGEVITY.
Decal Works, Cycra, Quicker USA, Scar, Works Connection and Renthal pulled the look collectively.
However, you don’t should stay together with your mistake. The MXA wrecking crew has a easy, age-old, well-proven plan. You can also make your 250 four-stroke torquier, broader and extra highly effective in a single easy step. The key sauce? Cubic centimeters. Oh, we don’t imply a silly quantity of up-sizing. No want to show your 250 right into a 325, a minimum of not if you’d like grunt mixed with extra energy in the correct locations. That is the place Cylinder Works’ 270cc package is available in. For $689.95, you get a brand-new cylinder, 3mm-larger Vertex piston and a Cometic gasket package. It’s a bolt-on package that ups the bore from 78mm to 81mm, and the displacement from 250cc to 269.5cc. All you must do is take away the inventory elements, slip the brand new cylinder and piston on and drop the top again into place. By four-stroke requirements, that is the only big-bore mod recognized to man.Better of all, this isn’t a package that requires you to bore your inventory cylinder out till the skirt is skinny sufficient to see by way of. Nope! The Cylinder Works package begins with a brand-new forged cylinder with a nickel silicon carbide cylinder sleeve that comes exactly sized and honed, giving your engine nice ring sealing and cylinder-wall longevity. The size of the Cylinder Works big-bore cylinder are sized to suit your inventory engine with none machine work or modifications. The compression ratio is 14.four:1, and the cast high-compression Vertex piston is out there in A, B and C sizes (for later rebuilds). Alternative piston kits can be found with piston, rings, pin and circlips for $219.32. Full Cometic gasket kits are $90.73.
Oh, yeah, did we point out that when you make the trade-up, you’ll have a wonderfully good FC250 cylinder and piston sitting on the shelf do you have to change your thoughts or need added worth on the resale worth of your FC250/270?
What else did we do to show our Husqvarna FC250 right into a Husqvarna FC270? In fact, we might have stopped with simply the bolt-on package. It’s a one-stop buying spree. We didn’t should do anything, in need of eradicating the backfire display (by operating a KTM/Husky two-stroke air filter cage). Even the inventory 14/49 gearing labored, as a result of the FC270 engine had the grunt to tug the tall gearing.
DON’T WORRY! IF YOU ARE ON A BUDGET, THE STOCK HUSQVARNA EXHAUST SYSTEM IS MORE THAN CAPABLE OF MAKING GOOD HORSEPOWER.
For many MXA check riders, the Cylinder Works Husky FC270 mod was too straightforward. MXA check riders just like the job to be more durable, so we requested them what else they thought we should always do to the FC270. Right here is their listing of added foof. Remember that we don’t assume that the next mods are crucial, simply icing on the cake.
ADDED PERFORMANCE PARTS
Race Tech. We despatched the suspension to Race Tech to have a coil-spring conversion package put in a spare set of WP forks and have the inventory AER air forks re-valved. We needed two units of forks for comparability functions. Whereas the bike was at Race Tech, the blokes volunteered to put in a Vortex X10 programmable ignition and map it for VP U4.four oxygenated race gasoline. We couldn’t resist, as a result of simply the U4.four was good for about 2 horsepower, particularly when correctly mapped.
FMF. Trying to assist the big-bore cylinder breathe higher, we added an FMF Manufacturing unit four.1 RCT Ti system with a MegaBomb head pipe. Not solely did it save a pair kilos of weight and enhance the mid-to-top transition, it additionally allowed us to take away the pipe with out having to take away the Husky shock first. Don’t fear! In case you are on a finances, the inventory Husqvarna exhaust system is greater than able to making good horsepower.
Supersprox. With the added horsepower and torque, we weren’t frightened concerning the inventory gearing being too tall, as it’s on the inventory FC250 setup, however we have been fearful concerning the put on and tear on the powertrain. Since our base FC250 already had a bunch of hours on it, we determined to switch the entrance and rear sprockets with Supersprox cogs and add a brand new chain.
Though we usually decrease the gearing on the inventory Husky FC250, we didn’t have to with the added punch of the 270cc package. Nevertheless, we did improve the drivetrain with Supersprox sprockets and a TM Designworks chain information.
Hinson clutch. If any clutch can maintain as much as added horsepower, it’s Husqvarna’s virtually bulletproof hydraulic system, particularly because the FC250 and FC350 share the identical clutch. However, simply to be on the protected aspect, we added a Hinson internal hub, strain plate, 280 N/m Belleville washer and clutch plates.
VP gasoline. The Cylinder Works FC270 will run on pump fuel with the inventory ignition, however to get the added juice, we determined to run oxygenated U4.four, which required us to remap it by way of a Vortex X10 ECU.
Cycra plastic. The MXA wrecking doesn’t construct sleeper bikes. We aren’t making an attempt to persuade anybody on the beginning line that our bike is a inventory 250. Thus, we’ve got Cycra plastic and Decal Works on velocity dial. The black Energy Move plastic and yellow graphics make our FC270 look particular, as a result of it’s.
Miscellaneous. The most important ticket merchandise was a set of Quicker USA wheels. Renthal provided the 604 FatBars and Cheesy grips. This Renthal combo was highlighted by ASV levers offset by Works Connection anodized elements and a Movement Professional aluminum throttle tube. The Scar footpegs have been beefy.
IF YOU BOUGHT A 250CC FOUR-STROKE THINKING IT WAS GOING TO BE THE CAT’S MEOW, ONLY TO DISCOVER THAT IT WAS AS UNPLEASANT AS CAT SCRATCH FEVER, THE CYLINDER WORKS 270 KIT WILL MAKE THE MISTAKE GO AWAY FOR A LOT LESS THAN BUYING A NEW BIKE.
Cylinder Works’ Husqvarna FC270 package options the very best high quality elements in a single package deal. It’s bolt-on prepared and $690 properly spent.
HOW DID IT WORK?
That is the perfect $690 we’ve got ever spent on an engine. We gained horsepower and torque at each step alongside the dyno curve—from as little as one horse down low to 5 extra horses via the center. The added torque helped the moderately linear 250SXF powerband turn out to be extra kinetic. As an alternative of mendacity down and ready for the rpm to construct, on the FC270 we might brief shift, rev it to the moon or slam via the gearbox. It had sufficient energy to tug a taller gear when it counted. It hit more durable and didn’t lose any rev on prime. It was candy. Better of all, in the event you aren’t sure by the rulebook or ethics, the Cylinder Works FC270 big-bore package is one of the simplest ways to get aggressive energy at a wallet-friendly worth.
Scar footpegs. Plenty of tooth, a lot of width and plenty of power.
Not solely did we like this engine higher than the stocker, we favored it with nothing greater than the 3mm-larger piston, which signifies that you can bolt the package on and depart nicely sufficient alone. It’s that good. However, when you get used to the bottom 269.5cc engine package, each aftermarket product we bolted on added to the horsepower and torque features. The FMF pipe, Vortex ignition and VP U4.four all elevated the facility, however they did it for greater than double the funding within the Cylinder Works big-bore package.
The MXA wrecking crew selected to check the Cylinder Works 270 big-bore package on a Husqvarna FC250. This can be a nice 250, however additionally it is one of many highest-revving four-strokes made, with the rev limiter set at 14,000 rpm. This singular function makes it a primary candidate for a big-bore package. Why? As a result of it already has over-rev to spare and thus will turn out to be rather more efficient when it’s mated to a strong midrange hit.
We’re fairly assured that the majority Husky FC250 riders can be proud of simply the big-bore package, however on our undertaking bike we added an FMF exhaust system, Hinson clutch and Vortex X10 ECU (to permit us to map for VP Racing U4.four gasoline).
Briefly, when you simply need to get extra midrange out of your 250cc four-stroke, go together with the big-bore package—with the information that it’ll run advantageous with all of your inventory elements and on available pump fuel.
What concerning the two units of WP forks? Each check rider beloved the texture of the coil-spring conversion package within the corners. The entrance tire tracked the bottom prefer it was glued to it, because of the supple really feel of coil springs. Paradoxically, they appreciated the progressive really feel of the air forks within the greater bumps and jumps. Underneath heavy masses, the coil-spring conversion package typically dove excessively, whereas the WP air forks might be fine-tuned with air strain to journey precisely the place we needed them. And, the three additional kilos that include the conversion package have been noticeable to check riders in fast transitions and underneath braking. Each had their charms, however for many MXA check riders, the WP AER air forks provided a greater general really feel, save for the brilliance of coil-spring forks when the entrance wheel is hitting braking bumps.
The Cylinder Works 2017–2018 Husqvarna FC270 package, which additionally matches on the KTM 250SXF, is just like the eraser on a pencil. It’s a do-over package. It makes errors go away. In case you purchased a 250cc four-stroke considering it was going to be the cat’s meow, solely to find that it was as disagreeable as cat scratch fever, the Cylinder Works 270 package will make the error go away for lots lower than shopping for a brand new bike.
HUSQVARNA FC270 SUPPLIER LIST
Bolt Hardware: www.boltmotorcyclehardware.com
Cycra Racing: www.cycraracing.com
Cylinder Works: www.cylinder-works.com
DeCal Works: www.decalmx.com
Quicker USA: www.fasterusa.com
FMF Racing: www.fmfracing.com
Movement Professional: www.motionpro.com
Moto Seat: www.motoseat.com
Race Tech: www.racetech.com
TM Designworks: www.tmdesignworks.com
Uni Filter: www.unifilter.com
Vortex Ignitions: www.vortexcdi.com
VP Gasoline: www.vpracingfuels.com
Works Connection: www.worksconnection.com