Home > Dirt Bikes > Off-Road > Beta 400 450 525 >   Cylinder Honing
Click thumbnails for alternate views.	Price $34.95 Product Code: CYLSER

The seal between the cylinder wall and the piston rings, is one of the critical factors of the performance of your engine. A really good seal, insures the lowest amount of pressure leakage past the rings, which means a higher power output at all RPM ranges. Just changing the rings, in your modern 4 stroke engine, can and will help the power when broken in right, but correctly honing the cylinder, as shown in Picture #2, will ensure the piston rings will mate completely with the cylinder wall. Not only does this make the most power, but correct honing keeps the oil retained on the cylinder wall, providing less wear on the piston, rings and cylinder. We now offer this service to the public, instead of just to the race engine builders. The reason is, 95% of the people we talk to or read about, do it wrong. You will do far more damage to your engine doing it wrong, than if you do nothing at all. Picture#1 This is a cylinder that came off a stock bike after 10 hours or so of some pretty hard riding. You can see the vertical wear lines in the cylinder from the ring and piston. This is normal wear for a 250 run hard for 10 hours. You can just replace the rings, but with no more good crosshatch grooves in the cylinder wall, the rings will never fully seal against the cylinder wall. In this case, you will never make all the power you could, and you will lose oil retention on the cylinder wall, which will cause accelerated wear on the parts. Picture #2 Here, we have honed the cylinder wall, using the correct hone, cutting oil and pressure. Most all of the vertical scratches are gone, and the correct angle of crosshatch can be seen all the way down the cylinder wall. The correct type of hone and honing oil, allow the grooves to be sharply cut into the very hard Nikasl cylinder coating. The sharp cuts, are what allow the softer material rings to get cut flat and seal perfectly to the wall. Also, the sharp crosshatch, is what holds, or "retains" the engine oil on the cylinder walls. *WARNING* Using the wrong type of hone, such as anything with abrasive stones, doesn't allow the Nikasil material to be cut, but to fold over onto itself. It will look like a crosshatch when done, but will not allow the rings to be cut smoothly. This will take away  power after a short time and will shorten top end life. Also, trying to "deglaze" your cylinder with a soft material like a green scotchbrite pad does nothing. Those are for cleaning kitchens. There is a lot of bad information on the internet. Cylinder prep is only $34.95. It includes honing, surfacing of the cylinder top for flatness and checking and cleaning of the base gasket surface. Cylinders usually ship back the next day. You'll be glad we did it right.

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