• Ciao Guest - You’ve landed at the ultimate Guzzi site. NEW FORUM REGISTRATIONS REQUIRE EMAIL ACTIVATION - CHECK YOUR SPAM FOLDER - Use the CONTACT above if you need help. New to the forum? For all new members, we require ONE post in the Introductions section at the bottom, in order to post in most of the other sections. ALWAYS TRY A SEARCH BEFORE STARTING A NEW TOPIC - Most questions you may have, have likely been already answered. DON'T BE A DRIVE-BY POSTER: As a common courtesy, check back in and reply within 24 hours, or your post will be deleted. Note there's decades of heavily experienced Guzzi professionals on this site, all whom happily give endless amounts of their VALUABLE time for free; BE COURTEOUS AND RESPECTFUL!
  • There is ZERO tolerance on personal attacks and ANY HYPERLINKS to PRODUCT(S) or other competing website(s), including personal pages, social media or other Forums. This ALSO INCLUDES ECU DIAGnostic software, questions and mapping. We work very hard to offer commercially supported products and to keep info relevant here. First offense is a note, second is a warning, third time will get you banned from the site. We don't have the time to chase repeat (and ignorant) offenders. This is NOT a social media platform; It's an ad-free, privately funded website, in small help with user donations. Be sure to see the GTM STORE link above; ALL product purchases help support the site, or you can upgrade your Forum profile or DONATE via the link above.
  • Be sure to see the GTM STORE link also above for our 700+ product inventory, including OEM parts and many of our 100% Made-in-SoCal-USA GTM products and engine kits. In SoCal? Click the SERVICE tab above for the best in service, tires, tuning and installation of our products or custom work, and don't miss our GT MotoCycles® (not) art on the BUILDS tab above. WE'RE HERE ONLINE ONLY - NO PHONE CALLS MADE OR RECEIVED - DO NOT EMAIL AND ASK QUESTIONS OR ASK TO CALL YOU.
  • Like the new V100, GuzziTech is full throttle into the future! We're now running on an all-new server and we've updated our Forum software. The visual differences are obvious, but hopefully you'll notice the super-fast speed. If you notice any glitches or have any issues, please post on the Site Support section at the bottom. If you haven't yet, please upgrade your account which is covered in the Site Support section or via the DONATE tab above, which gives you full site access including the DOWNLOADS section. We really appreciate every $ and your support to keep this site ad-free. Create an account, sign in, upgrade your account, and enjoy. See you on the road in 2024.

Transmission Vibes.

ghezzi

ghezzi

High Miler
GT Contributor
Joined
Jul 7, 2011
Messages
830
Location
Brisbane
2007 Bellagio (CARC) with 30,000k. I have a cyclical vibration felt primarily through the left foot peg, very similar to a tight spot in a drive chain.

Uni's/tail shaft has been inspected, and another unit tested. Engine & exhaust mounts re-torqued. All oils changed.

Symptom is most noticeable between 50 & 70kph in 3rde gear, needs low engine speed and more load.
Higher revs or speed it cannot be detected, dis-engage the clutch and coast - it all disappears.

Hold 3rd gear at 50kph going uphill, slowly increase speed and the tempo/frequency slowly increases.
Change to 4th gear & tempo/frequency drops. All disappears by 80kph.

I surmise an input shaft bearing close to 3rd gear, at slow shaft speed the loads are greater.
Any ideas? ...................................................................................Somebody, tell me I'm dreamin'.
 
I like to eliminate the easy stuff first. You have probably already done this, but have you done a TB sync and TPS reset recently? Since you are load and RPM sensitive, it could be sync, so at least confirm that is or isn't the issue. Once that is confirmed, we can go to more serious possibilities if the vibration is still present.
 
TB's and TPS checked a few thousand Km ago, but have fitted a V7 tank recently. Air path/clearance around filter has changed.
 
If its a tuning issue, then no damage shall occur. Will continue to ride but will do as you suggest in a few weeks.

Upside is, this issue forced me to pull apart my rear end and I discovered little grease in swingarm bearings and none on the splines. I paid for this to be done when I purchased the bike at 17k - ripped off.
 
They get regular check ups, had rear shock(s) in/out 20 times so far. Very easy without a tool/battery box in the way.

To digress; rider weight of 95kg/210lb and bike wet weight down to about 205kg/450lb.
I've tried an 11kg Ohlin's spring on a modified Griso shock, was close to the money and now mounted on another Griso, owner very happy.
My Matris came with a 120 N/mm spring as set up for a heavier forum member - too hard.
Tried an Eibach 600lb spring (about 105 N/mm) needed too much pre-load to get rider sag right.
Now have an Eibach 650lb spring (about 114 N/mm) fitted. Haven't taken any measurements yet but just the ride quality over rough roads is absolutely amazing. Obviously getting the right balance between hi & lo-speed damping helps.

I did the 'Melon Patch' today, Australia's roughest black top coated motocross track that the gummint claims is a road. WTF?
Handles like a dream, poised, controlled and last but not least, COMPLIANT! Most challenging bit is riding woops while cranked over, and realizing you need to lean harder. :D:D:D
 
You must log in or register to reply here.
Back
Top