New vibration.

Energy One
stlmikie

stlmikie

I wish I had more money.
Well I have developed this new vibration. It happens at around 1900 rpm. Clutch in or out on or off brake. What do you guys think it may be. When I say 1900 tthat is right on actully. Going slow or at highway speed. Speed dosn't seem to make a difference. Thanks guys. Oh yeah. 03 mastiff.
Mikie out.
 
KnotSo

KnotSo

Admin
Staff member
Where on the bike does the vibration seem worse.

Motor mounts all tight?

Time to do a complete nut and bolt end of season check anyway.
 
stlmikie

stlmikie

I wish I had more money.
I really can't tell where it is coming from even. But you are correct with the complete once over.
 
B

bigdogtech01

Well-Known Member
stlmikie said:
Well I have developed this new vibration. It happens at around 1900 rpm. Clutch in or out on or off brake. What do you guys think it may be. When I say 1900 tthat is right on actully. Going slow or at highway speed. Speed dosn't seem to make a difference. Thanks guys. Oh yeah. 03 mastiff.
Mikie out.
Click to expand...

How bad is it? Bad enough you feel it may be from the crank? I have had a few Ironhorses that developed a vibraton due to the customer riding the bike so hard it actually twisted the flywheel halves, causing it to run out of true and therefor made the bike vibrate excessively. If you can not find the problem and are frustrated you may have not choice other than to measure your pinion shaft run out. Spec is no greater than .002" according to S&S.
It takes some time to do this but may be necessary just for a simple elimination, hopefully no issues.
 
stlmikie

stlmikie

I wish I had more money.
Funny you mention that woodman. I am going to pull my wheel tomorrow. I have 12000 miles on it and that did cross my mind. But with that the vibration is the same at 60 mph as it is at 15 mph when I get to the 1900 rpm range. Oh and Ray, if you read this thanks for the info on the rim savers. I will be changeing my tire tomorrow. And Jake thanks to you as well. Got the beads today.
 
G

Gas Man

Cool isn't cheap
Calendar Participant
Motor mounts (more specifically the top motor mount being the worst)
handle bar bushings.
 
alhall88

alhall88

UAW
bigdogtech01 said:
How bad is it? Bad enough you feel it may be from the crank? I have had a few Ironhorses that developed a vibraton due to the customer riding the bike so hard it actually twisted the flywheel halves, causing it to run out of true and therefor made the bike vibrate excessively. If you can not find the problem and are frustrated you may have not choice other than to measure your pinion shaft run out. Spec is no greater than .002" according to S&S.
It takes some time to do this but may be necessary just for a simple elimination, hopefully no issues.
Click to expand...
This winter I will be pulling off my beltdrive to replace a transmission seal thats been going bad. Since I will have everything down this is one thing I want to check because I have always suspected some higher than normal crank runout. What is the best method for this check? I have the necessary indicators and bases but is cranking the engine over the way to spin it?
 
B

bigdogtech01

Well-Known Member
alhall88 said:
This winter I will be pulling off my beltdrive to replace a transmission seal thats been going bad. Since I will have everything down this is one thing I want to check because I have always suspected some higher than normal crank runout. What is the best method for this check? I have the necessary indicators and bases but is cranking the engine over the way to spin it?
Click to expand...
You want to check the opposite side, Pinion shaft for run out.
Using a dial indicator on a fixed surface and sucuring the bike so it does not move at all. You will need to remove your cam cover, pushrods, and cam in order to perform this measurement. Turn the motor over by hand, not by starter button. You want to turn it over slow so you can see how much your dial indicator moves. If it moves more than .002", you will need to rebuild your lower end.
 
alhall88

alhall88

UAW
bigdogtech01 said:
You want to check the opposite side, Pinion shaft for run out.
Using a dial indicator on a fixed surface and sucuring the bike so it does not move at all. You will need to remove your cam cover, pushrods, and cam in order to perform this measurement. Turn the motor over by hand, not by starter button. You want to turn it over slow so you can see how much your dial indicator moves. If it moves more than .002", you will need to rebuild your lower end.
Click to expand...
Gotcha, thanks I guess I was hoping that I would be able to check an area in front of the flywheel.
 
bdmridgeback

bdmridgeback

Low Down Chop Shop
stlmikie said:
Funny you mention that woodman. I am going to pull my wheel tomorrow. I have 12000 miles on it and that did cross my mind. But with that the vibration is the same at 60 mph as it is at 15 mph when I get to the 1900 rpm range. Oh and Ray, if you read this thanks for the info on the rim savers. I will be changeing my tire tomorrow. And Jake thanks to you as well. Got the beads today.
Click to expand...
If it is a RPM related vibration (1900 rpm) no matter what gear or speed, then it will have nothing to do with the wheels or bearings in them. It is a motor vibration.

I am chasing one too. My daytona trip, vibration popped up and horn mount broke and ignition switch broke.

If I pull in the clutch and roll after it idles down it is smooth, no matter if it is 40 mph or 80 mph.

I'll find it! :bang: Good luck on yours!
 
PSI GERMANY

PSI GERMANY

Active Member
Most likely the top motor mounts. Happened to me when Carl's Speed Shop didn't tightened properly the top motor mounts after service.:spank:
 
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