Noise when pushing bike backwards in neutral

[Eddie Haskell]

Originally Posted by Dan89FLSTC

The inner primary bearing will not be spinning when the engine is shut off and the bike is in neutral (when turning the rear wheel).

With the engine shut down and the clutch lever released (clutch engaged) the mainshaft cannot turn because it is mechanically linked to the engine (via the clutch), which is not turning.

The countershaft will turn, but not the mainshaft.

The inner primary bearing will spin when the engine is running and the bike is in neutral, it will stop spinning when you drop the bike into gear, and it will start spinning as the clutch is engaged and the bike starts moving.

The inner primary bearing will also spin when you push the bike while it is in gear.

Grit in primary...the primary drive is sealed, no grit getting in there, but grit in the secondary drive around the pulley could be, since that is just about the dirtiest area on the bike.

Best suggestion has already been made, get the rear wheel off the ground and listen while you rotate the rear wheel.

Sorry but the inner primary bearing will turn in neutral if the clutch lever is out (engaged), or anytime the back wheel turns, it is on the transmission output shaft which is mechanically linked to the back wheel via the drive belt.

[Dan89FLSTC]

Originally Posted by Eddie Haskell

Sorry but the inner primary bearing will turn in neutral if the clutch lever is out (engaged), or anytime the back wheel turns, it is on the transmission output shaft which is mechanically linked to the back wheel via the drive belt.

The inner primary bearing is mounted on the Mainshaft, not the output shaft (correct name is Main Drive Gear).

The only time the Mainshaft is mechanically linked to the Main Drive Gear is when the transmission is in gear.

There are three shafts in a 5 speed transmission:

Mainshaft: Power in to transmission

Countershaft: Connects Mainshaft to Main Drive Gear, except when in 5th gear- when in 5th, the Mainshaft is locked to the Main Drive Gear, and the Countershaft just freewheels.

Main Drive Gear: Power out of transmission, this is the splined shaft that the front belt pulley is mounted onto.

[Eddie Haskell]

Originally Posted by Dan89FLSTC

Main Drive Gear: Power out of transmission, this is the splined shaft that the front belt pulley is mounted onto.

and the shaft that holds the inner primary bearing, so if the wheel is turning so is the "inner primary bearing"

[Dan89FLSTC]

Originally Posted by Eddie Haskell

and the shaft that holds the inner primary bearing, so if the wheel is turning so is the "inner primary bearing"

No, it is not the shaft that holds the inner primary bearing...

The shaft that holds the inner primary bearing is the Mainshaft.

The rear wheel turns the front pulley, which is mounted onto the Main Drive Gear.

The only time these two shafts are connected mechanically is when the transmission is in gear.

[Eddie Haskell]

You made me break out the manual, you are correct, I am wrong...or am I!

[rosankharleyman]

My 03 ultra does the same thing. I have watched the belt with the rear wheel up and rolling the wheel backwards, the belt will crawl to one side and start making noise. Done this for years, have not had any problems

[da-puhi]

Well, after having the bike off the ground on two occasions I found the problem to be the fuel tank vent hose intermittently rubbing against the belt near the front sprocket. Removed the charcoal canister, but kept the vent hose so the tank could vent. Easy fix once the problem was found. All quiet again. Thanks for everyone's suggestions.

[Eddie Haskell]

Originally Posted by Dan89FLSTC

No, it is not the shaft that holds the inner primary bearing...

The shaft that holds the inner primary bearing is the Mainshaft.

The rear wheel turns the front pulley, which is mounted onto the Main Drive Gear.

The only time these two shafts are connected mechanically is when the transmission is in gear.

Not to but tell me again how the wheel moving doesn't turn the inner primary bearing.[IMG][/IMG]

[Dan89FLSTC]

Originally Posted by Eddie Haskell

Not to but tell me again how the wheel moving doesn't turn the inner primary bearing.[IMG][/IMG]

You are looking at TWO shafts in that pic...the long one is the mainshaft, which passes right through the center of the short shaft that the pulley is mounted on.

With the transmission in neutral, you can grab that mainshaft (the long one) with your hand and rotate it, and the pulley will not move.

They are SEPARATE shafts.

[Dan89FLSTC]

Gearset pics...hope this works right....

From left to right:

Assembled gearset

Gearset with Main Drive Gear removed from Mainshaft.

Main drive gear (the splined part is where the belt pulley mounts, you can also see the threads for the pulley nut at the end of the splines. The big gear part is inside the transmission)

Opening in main drive gear where the mainshaft passes through.

The crud on the gears is a mixture of Redline Heavy Shockproof and styrofoam packing material (a mess).

[Eddie Haskell]

Originally Posted by Dan89FLSTC

Gearset pics...hope this works right....

From left to right:

Assembled gearset

Gearset with Main Drive Gear removed from Mainshaft.

Main drive gear (the splined part is where the belt pulley mounts, you can also see the threads for the pulley nut at the end of the splines. The big gear part is inside the transmission)

Opening in main drive gear where the mainshaft passes through.

The crud on the gears is a mixture of Redline Heavy Shockproof and styrofoam packing material (a mess).

Makes perfect sense now, thanks for clearing that up!, What were they using in the tranny, please explain the chunks??

[Dan89FLSTC]

Originally Posted by Eddie Haskell

What were they using in the tranny, please explain the chunks??

The lube that was used is Redline Heavy Shockproof, it looks like Pepto Bismol ( I don`t use it in my transmissions).

The crap all over the gears is styrofoam, I bought the gearset on ebay, and it was packed in the molded styrofoam shipping container, and they did not bother to wrap the oily gearset in plastic, they just tossed it into the styrofoam. A big mess, but I will tear it down completely and clean it anyway, to make sure everything is good, before it gets installed into a transmission case.

[watchguy]

between the 'inner primary bearing' and the 'inner main shaft bearing?

[arizaino]

Originally Posted by ron baumer

possibly the drive belt hitting the belt guard,my does it and yes it is adjusted correctly.

Ron

The drive belt pulley (primary) has only one cheek....when the bike is moved in the reverse direction, the belt will move to the side of the pulley with no cheek and cause the belt to rub as mentioned above. Normal

[watchguy]

that the sound coming from the primary when I rotated the rear wheel was the following. Clutch Hub, Clutch Hub bearing, Hub Splines were disintigrating inside primary. Roller Bearings, Ball Bearings and new inner mainshaft bearings (again) All on ESP