I just put my new cylinders in place and wanted to run a question past everyone before I finish the install.
The cylinders I bought have had the bridge divider cut out of the intake side facing the carbs. How, if any will this affect the running of the sled? It doesn't appear as if any other modifications were made to the cylinder. A picture is included.
Thanks
Don
Donald L. Gilbert, Jr.
1983 Yamaha Vmax
1986 Yamaha Vmax
Thats not good. Guys will do that sort of thing on race engines in hopes of getting more air into the cylinders. You have to be very carfull when doing that because the bridge was there to keep the piston from catching on the bottom of the intake port on the down stroke. Removing bridges like that can cause extreme premature wear on the intake side of the piston. The intake side is the "thrust" side on most 2 strokes including the 540 Vmax so there is substantial pressure on that side of the piston. It is usually not a good idea to do that on an engine that will see trail riding. You can get away with it on a race engine sometimes as they don't run very long and will usually see more service to the top end.
I wouldn't run them on a trail sled but if you do make sure you chamfer the bottom edge of your piston and make sure the port is chamfered as well. If the piston starts catching on that edge it will come apart in very short order.
Well that isn't the news I wanted to hear. I di have another set of clyinders, but they are sleeved. Do you see any problems running sleeved cylinders with Wiseco pistons? I will need to look at them carefully too as I think there was a reason why I didn't want to use them. I haven't torqued the engine down yet, so I can swap the cylinders if needed. We don't have any snow yet, but I am sure we will soon and I want this thing to be trouble free.
Thanks
Donnie
Donald L. Gilbert, Jr.
1983 Yamaha Vmax
1986 Yamaha Vmax
opsled wrote:Thats not good. Guys will do that sort of thing on race engines in hopes of getting more air into the cylinders. You have to be very carfull when doing that because the bridge was there to keep the piston from catching on the bottom of the intake port on the down stroke. Removing bridges like that can cause extreme premature wear on the intake side of the piston. The intake side is the "thrust" side on most 2 strokes including the 540 Vmax so there is substantial pressure on that side of the piston. It is usually not a good idea to do that on an engine that will see trail riding. You can get away with it on a race engine sometimes as they don't run very long and will usually see more service to the top end.
I wouldn't run them on a trail sled but if you do make sure you chamfer the bottom edge of your piston and make sure the port is chamfered as well. If the piston starts catching on that edge it will come apart in very short order.
opsled
This answer/advice is right on the money!
Nice job opsled!
