KC Baggers

NHRA Nitro Harley pit report following final qualifying. We check in with Mike Scott after his crash, talk to Doug Vancil about qualifying No. 1 and preview eli...minations. It will be Doug Vancil vs. Randal Andras, Beau Layne vs. Kevin Boyer, Mike Scott vs. Tak Shigematsu and Rickey House Sharkracing - Top Fuel Harley Davidson Motorcycle vs. Michael Beland. See more

This is a follow-up regarding the Milwaukee-Eight (M8) Valve Seat issue. We had a lot of good comments and wanted to share what we did before we decided to pos...t the video. We noticed this on our big bore kits when we were putting the heads back on with new rings - we make it a standard practice to put the head on torque and leak the motor down to make sure that we have no issues. That’s when we saw the 25-28% leak down. Please note - this was NOT going past the rings. It was past the valve and the valve seats. GMS Racing helped us identify a means to pressurize the port from the outside so we can show you the leak down. It was a great idea. You will note that the leak down is not going past the valve seat. It’s between the head and the seat itself. The whole issue is not a machining issue - it’s when the seats are being installed. When the seats are pressed in or, knocked in - it cocks and takes the material and scores the bore to the bottom of the seat hole. Material is built up under the seat area. When we measure our press fit using a micrometer, we’re seeing .0025-.0030 of variation in the O.D. of the seat and that material ends up at the bottom. That’s what cocks the seat and allows for it to leak underneath. So the seat does not have a complete press all the way around it. That’s why we’re seeing this issue. We just wanted to share the effort that we went through to prove the issue. This was not a single head issue, it was repetitive so we wanted to make you aware of it. If you have any questions - contact us at 336-993-7068 or, visit us online at https://tmanperformance.com/

A quick video to show some issues that we're seeing with the Milwaukee-Eight(M8s). We're doing a leak down on the motors before we disassemble them and we're f...inding a 20-25% leak down on the motors. This is attributed to the seats in the heads - the exhausts are loose in the heads. This is going to create an issue down the road with the seats coming loose in the heads and it should be checked. The machining of the seat hole is off. If we're doing a bike in-house, we'll leak the motor down after we get the pushrods to see where we're at - they should be between 3-5% (no more than that). The heads that are coming in that we are doing that do not have bikes on them - we've made a fixture that before we break the head down, we bolt this onto the head and leak down the head by itself. Normally, it will show up very quickly. We also do a drop test on these heads - we heat the heads to press the guides out, we bring them up to a temperature then, drop it onto a piece of plywood to see if it comes loose. Something that we wanted to bring to your attention. Out of the sets we've seen, we've had about 6 sets with this seat issue. Keep this in mind - if you're at your Harley dealership, a leak down test will show the issue. We're set-up on the CNC machine to machine out the holes, put new seats in and sync everything to the proper depth and get you up and going again. If you have any questions - contact us at 336-993-7068 or, visit us online at https://tmanperformance.com/

MERRY CHRISTMAS

Professional installation of all upgrades available at affordable prices. The list is long and winter is short get your name on the list now to insure your the baddest bike on the block next spring.

T-MAN PERFORMANCE introduces New M8 Products at #Biketoberfest in Daytona. Our new Milwaukee-Eight (M8) Kits. 107 to 120 Big-Bore kit using a 4-inch 185 bore (n...ote, you need to use the Screaming Eagle cylinder with the larger vessel). For the CVOs, we offer a 117 to a 124 using a 4-inch 185 bore with no case modifications. We're also Introducing our new M8 Heads, our new Street Performer head with a half millimeter over intake and a half millimeter over exhaust. It is not CNC ported - we put all new guides in it and set the spring pack up. Another new M8 head that is fully CNC ported - it comes with 1 over intake and 1 over exhaust and the chamber is CNC ported which increases the effectiveness of the head. All of these items will be ready to ship in a couple of weeks. For more information, you can call us at 336-993-7068 or send us message through our site at tmanperformance.com

Check out TR's PInion Gear Tech Tip for the new Milwaukee-Eight The pinion gear broaching is a little loose - we've worked with Andrews to produce a new gear wi...th sized down broaching for a solid fit. A loose pinion gear can affect your torque and cam timing. The same pinion gear is applicable for the Twin Cams, especially those with miles on them - a nice upgrade. To get yours today, Part # 216324 for $54.95, call us at 336-993-7068. To see more Tech Tip Videos - visit us online at tmanperformance.com.

Less than 5 months till ..............

HAPPY NEW YEAR!