Vibration in 4th gear
Big Kahuna HDF Member
Joined: Feb 2006
Posts: 23,881
Likes: 34
From: USA
1.Go over the entire bike with a wrench and tighten every fastener you can get your tools on.
2. re-torque all critical fasteners
3. check your belt tension
4. inspect & tighten all 3 engine mounts
5. visually inspect rear tire alignment
6. Drain trans oil and check for metal on drain plug magnet. Refill with 85w140 or higher gear oil. (if you get metal filings or chunks save and take to dealer immediately) Save used trans oil in a clean and sealed container in case you need to have it analyzed to prove there is excessive wear metals in it. There can be no other liquids or solids in this container as it must be spotless and dry. Seal it immediately.
7. If you get metal chunks on the magnet go to Blackstone Labs website and order a test kit and have the used trans oil analyzed and take the report to the dealer. If there is a bearing or bushing coming apart in your trans it will show up in the oil analysis.
Do all of this before your warranty expires.
2. re-torque all critical fasteners
3. check your belt tension
4. inspect & tighten all 3 engine mounts
5. visually inspect rear tire alignment
6. Drain trans oil and check for metal on drain plug magnet. Refill with 85w140 or higher gear oil. (if you get metal filings or chunks save and take to dealer immediately) Save used trans oil in a clean and sealed container in case you need to have it analyzed to prove there is excessive wear metals in it. There can be no other liquids or solids in this container as it must be spotless and dry. Seal it immediately.
7. If you get metal chunks on the magnet go to Blackstone Labs website and order a test kit and have the used trans oil analyzed and take the report to the dealer. If there is a bearing or bushing coming apart in your trans it will show up in the oil analysis.
Do all of this before your warranty expires.
Tourer
Joined: Jul 2009
Posts: 289
Likes: 0
From: Enterprise, AL
The above is good advice. If there was in fact something wrong with the transmission itself, then conceivably you might be able to replicate this pulsing vibration in gears 1-4, since these gears share the same mainshaft, or I suppose something could be off with just the 4th gear itself. Either way, getting inside will be expensive diagnostics, so eliminate the easy stuff first.
Grand HDF Member
Joined: Jun 2007
Posts: 4,598
Likes: 421
From: Lansing mi
1.Go over the entire bike with a wrench and tighten every fastener you can get your tools on.
2. re-torque all critical fasteners
3. check your belt tension
4. inspect & tighten all 3 engine mounts
5. visually inspect rear tire alignment
6. Drain trans oil and check for metal on drain plug magnet. Refill with 85w140 or higher gear oil. (if you get metal filings or chunks save and take to dealer immediately) Save used trans oil in a clean and sealed container in case you need to have it analyzed to prove there is excessive wear metals in it. There can be no other liquids or solids in this container as it must be spotless and dry. Seal it immediately.
7. If you get metal chunks on the magnet go to Blackstone Labs website and order a test kit and have the used trans oil analyzed and take the report to the dealer. If there is a bearing or bushing coming apart in your trans it will show up in the oil analysis.
Do all of this before your warranty expires.
2. re-torque all critical fasteners
3. check your belt tension
4. inspect & tighten all 3 engine mounts
5. visually inspect rear tire alignment
6. Drain trans oil and check for metal on drain plug magnet. Refill with 85w140 or higher gear oil. (if you get metal filings or chunks save and take to dealer immediately) Save used trans oil in a clean and sealed container in case you need to have it analyzed to prove there is excessive wear metals in it. There can be no other liquids or solids in this container as it must be spotless and dry. Seal it immediately.
7. If you get metal chunks on the magnet go to Blackstone Labs website and order a test kit and have the used trans oil analyzed and take the report to the dealer. If there is a bearing or bushing coming apart in your trans it will show up in the oil analysis.
Do all of this before your warranty expires.
Banned
Joined: Oct 2007
Posts: 1,494
Likes: 5
CB
Tourer
Joined: May 2010
Posts: 316
Likes: 2
yes. it's usually the front motor mount.
dynas vibrate more than other models.
it just is.
It's a tractor motor in a motorcycle, it's going to vibrate.
check the front motor mount.
Guess this guy never rode and EVO or a Shovel?? hahahahahahaha
dynas vibrate more than other models.
it just is.
It's a tractor motor in a motorcycle, it's going to vibrate.
check the front motor mount.
Guess this guy never rode and EVO or a Shovel?? hahahahahahaha
Tourer
Joined: May 2010
Posts: 316
Likes: 2
oh and BTW, I've seen the motor mounts more on FXDB's and Lowriders
than FXD's or WG's.
But that's what I've seen in another area it could be different.
than FXD's or WG's.
But that's what I've seen in another area it could be different.
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Banned
Joined: Mar 2010
Posts: 5,403
Likes: 7
From: Southwest Florida
Both rods on one crank pin. On some of the WWII fighter aircraft (P-47, Hellcat, F4 Corsair) they had two rows with nine pistons each on one crank pin. Imagine the vibrations out of those monsters.
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