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Author Topic: Engine Vibration RPM specific  (Read 8311 times)

Offline Fanhead

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Engine Vibration RPM specific
« on: February 23, 2016, 04:18:09 PM »
New to the forum and have owned #270 for a year now, love the bike but the vibrations between 2300 and 2800 rpm's are shaking my eyeballs out of my head.
I'm in Ontario Canada so not a lot of resources up here, any help would be greatly appreciated.
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Offline wytfut

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Re: Engine Vibration RPM specific
« Reply #1 on: February 23, 2016, 04:55:39 PM »
Make sure belt is loose...  You owners manual is way too tight.
I put my belt on and if it jumps cogs, I tighten until it quits jumping cog...
And let's hope that solves it.

Next step will be motor mounts... How they look. Wash rust around caps or area? Pull the caps....   Are the center's sagging or sre they in the center?  Looking at front mounts from front... Are they sagging or torn?.

Check that stuff out..and come back with a report.

Motor mounts can/will create all kinds of havoc...

And fan head, welcome to our little community...  It's a good time

FlatlandersupportingXworld
Bruce
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Offline Fanhead

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Re: Engine Vibration RPM specific
« Reply #2 on: February 24, 2016, 07:44:25 AM »
Thanks wytfut for the welcome and the reply!
Belt is not an issue as the vibrations occur when driving with /without the bike in gear or when parked, motor mounts have been done twice already and are now at 10,000 miles.
I removed the caps, fronts looks prefect but the rears are not centred at all.
I'm thinking the mounts need to be done again but is there anything I can do to the engine to minimize the vibrations?
Thanks again !
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Offline Jumper

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Re: Engine Vibration RPM specific
« Reply #3 on: February 24, 2016, 10:30:23 AM »
Early X... Built 3-16-99>3-19-1999... Probably has the early crank in it. Do like Bruce said and loosen the belt.. Check mounts...

Jumper
 ::)
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Offline Fanhead

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Re: Engine Vibration RPM specific
« Reply #4 on: February 24, 2016, 02:51:42 PM »
Thanks Jumper, new front and rear isolators on order and belt now loosen to turn 90 deg with me on it as per Atlantic's great advise.
Any tips on replacing the front and rears would be greatly appreciated
Thanks again!
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Offline wytfut

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Re: Engine Vibration RPM specific
« Reply #5 on: February 24, 2016, 05:17:27 PM »
Fronts are e z...   Pretty much straight forward.... 
Rears be prepared with a floor jack and pry bar....2# hammer and drift.
Start soaking rear and all rear assembly now... With a good penetrating oil.... I prefer kroil,
Don't be shy about running the Allen head bolts out a bit...  Soak and strike once a day each direction. We want this to be simple when you r ready to do it

Have heard of horror stories of owners cuttin that rear rod out with torch. I have never had any issues... But you never know
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Offline 2CoolWheels

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Re: Engine Vibration RPM specific
« Reply #6 on: February 24, 2016, 05:31:58 PM »
Hi Fanhead,
   It turns out it's not the mounts alone that are the problem.....especially with the rears. The original chrome nuts that hold the mount into the frame "ears" were too shallow, and didn't fully seat the mounts into the opening. Then, as the mounts move in the "ears", they cause wear.
  Get a hold of Atlantic, Jamie and Marty have updated mount nuts made of stainless steel that will keep the mounts from wallowing out the opening in the frame "ears" and causing further problems.

Mike
#741 #901
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Offline wytfut

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Re: Engine Vibration RPM specific
« Reply #7 on: February 25, 2016, 02:41:51 PM »
And they also have the cheaper version.... The spacer washers that also work

Currently I he motor mount count is getting lean....    I strong recommend either one to support the design
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Offline blackheart

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Re: Engine Vibration RPM specific
« Reply #8 on: March 01, 2016, 09:11:36 PM »
Speaking of early & late crankshafts'.....does anyone know the balance factor of the early vs late cranks?
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Offline wytfut

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Re: Engine Vibration RPM specific
« Reply #9 on: March 02, 2016, 06:12:47 AM »
I'm sure some one on here does.... I do not
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Bruce
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Offline Fanhead

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Re: Engine Vibration RPM specific
« Reply #10 on: March 09, 2016, 10:02:25 AM »
Thanks for all the replies, parts are here today and looking forward to getting started.
For the rears the previous owned destroyed the shaft and currently there is a custom made one in place, he had a really hard time doing the rears.
I have a new shaft coming, replacing the entire rear mount system so hopefully this will fix the problem, at least till they wear again, having the belt loose will most likely extend the life greatly though.
« Last Edit: March 09, 2016, 12:26:37 PM by Fanhead »
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Offline Fanhead

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Re: Engine Vibration RPM specific
« Reply #11 on: March 09, 2016, 12:28:46 PM »
Picture of my front belt side motor mount, yep guess this was the cause, motor was resting on the frame.
Thanks again everyone.
Fanhead
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Offline wytfut

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Re: Engine Vibration RPM specific
« Reply #12 on: March 10, 2016, 04:12:43 AM »
Yup.. That would be an issue...
Good to kno you found it....
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Offline Mad River MoCo

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Re: Engine Vibration RPM specific
« Reply #13 on: June 16, 2016, 10:08:08 AM »
Quote from: wytfut on February 24, 2016, 05:17:27 PM
Fronts are e z...   Pretty much straight forward.... 
Rears be prepared with a floor jack and pry bar....2# hammer and drift.
Start soaking rear and all rear assembly now... With a good penetrating oil.... I prefer kroil,
Don't be shy about running the Allen head bolts out a bit...  Soak and strike once a day each direction. We want this to be simple when you r ready to do it

Have heard of horror stories of owners cuttin that rear rod out with torch. I have never had any issues... But you never know

I had the rear rod cold weld to the block and had to cut it out with a torch. The amount that sucked is immeasurable
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Offline wytfut

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Re: Engine Vibration RPM specific
« Reply #14 on: June 16, 2016, 05:04:23 PM »
Matt,
I totally believe you. Humberto Martinez had the same ordeal.... torch and all.

I'm starting to wonderif it wouldn't be smart to pull rears off and lube up with some never sneeze.

Mine came off no problem... but obviously others....

Matt do you believe delay in replacing was an issue?
Bruce
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