sprint st 955 09' gearbox rattle driving me mad - Triumph Forum: Triumph Rat Motorcycle Forums
» Main Menu

Discussion Forums
 » Twins
 » Tiger
 » General
 » RAT

Features
 » Blogs

Motorcycle.com Links

Contribute
 » Photo

Motorcycle Forums
» Insurance
» Sponsors
» Our Partners
»ATV Reviews
»Motorcycle Games

The Welcome Center New to the Site? Please take a moment to introduce yourself. New members and members who have yet not posted MUST post their first post here to activate their profiles.

Reply
 
LinkBack Thread Tools Display Modes
Old 11-11-2012, 11:09 AM   #1 (permalink)
New Member
Newbie
Main Motorcycle: sprint ST 955i 1999 16k
 
slapper4's Avatar
 
Join Date: Jun 2012
Location: christchurch, dorset UK
Posts: 1
Other Motorcycle: kawasaki gpx 750r F1 1986
sprint st 955 09' gearbox rattle driving me mad

Hi,
my ST trasmission ALWAYS rattles, especially low power cruising.

if you put the bike on the centre stand, put it in any gear at idle, as soon as you drop the clutch and the final drive is working, you hear this jumping rattling souns and vibration coming from inside the gearbox, you even see the rear wheel judder and obviously its spoils the ride, on otherwise perfect bike.

Ive searched the forum, and the internet, its not the normal things, my feeling as an experienced mechanic myself, is that one of the rotating parts mybe balancer shafts or gear shafts is tapping into another bit of metal inside.

you can feel it very clearly if you push the rear brake lever a bit during low acceleration, and it definitely is worse on rough roads which leads me to think something is loose inside.

obviously ive inspected the final drive chain and sprocklets, all perfect now, and ive tried on the minimum and maximum limit tension - no change.


sounds like the chain jumping, but ive eliminated that, it's definitely inside the final drive area, and you cant feel it at idle or full power, only when riding with little or no acceleration (nearly all the time)

i am from UK, Ive bought this 6 months agio, a 09 sprint ST 955i with only 18k from careful previous owners, FSH, showroom condition.

ive investigated this problem with my mechanic, adjusted everything, the main dealer reccomended the alternator pulled, which i did, and renewed the noisy bearings but no difference. no prob with alt. drive plate bolt etc we suspected, it was perfect. unfortunately main dealer and my mechanic could not be persuaded to road test it at low acceleeration, where its most obvioulsy something disturbing.


ive heard there a thrust bearing in the clutch, or a balancer shaft issue that could be out. but i dont want to break clean gaskets and open it up chasing re-herrings

I have balanced the throttles, but am only getting 36mpg 170 miles/tank, and the engine sounds rough at idle, but incredibly powerful any other time, its a joy to ride fast RPM.
a mate of mine whos had bikes all his life and a 09 daytona rode it 10 mins could feel a thing, i am sure thats because he thrashed it, so waste of time.

another irritating thing id like to fix, -i notice when going down into 1st gear the ECU speeds up the idle after a second, which nearly causes you to crash in a slow tight corner, but now i am expecting it, not. ive bought the usb dongle and tuneecu but dont know if i can adjust the anti-stall settings. id like to lower the idle speed but afraid it will sound too rough.

i thought i could fix gearbox myself, as i am a skilled mechanic, so ive bought and studied both haynes and triumph manuals, but what i would like, is to identify the fault before i have to take it off the road to strip, and know where to look for wear etc.

does anyone have the same gearbox problem/found the cause/solution?

is there a step-by-step guide to removing the gearbox bottom cover and checking for things like lazy fork return springs?

any pointers appreciated, but please dont suggest anything to check unless it fits MY symptoms (rattling in ALL gears, particularly NOT under load)

it sounds and feels through your feet, someone is tapping the metal footrests with a small hammer, erraticaly but roughly in time with the sprocket RPM

IT IS NOT MY SPROCKETS OR FINAL DRIVE

anybody SURE what this is?
slapper4 is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Triumph Forum: Triumph Rat Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter your valid email address, that can receive an automated confirmation message. Otherwise, you won't be able to gain full access.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Trident Sprint Rattle matt123 Hinckley Classic Triples 7 02-10-2010 01:13 PM
gearbox oil 2006 sprint ST granteuk Sprint Forum 4 12-28-2009 03:54 AM
SPRINT ST gearbox GAZ-22 Sprint Forum 33 10-31-2008 05:20 AM
2000 Sprint RS alternator rattle.. normal or bad?? Yodasoldier Sprint Forum 7 10-04-2008 05:15 AM
03 Sprint ST/01 Honda CBR1100XX Driving Impressions Jim_in_Calgary Sprint Forum 11 06-08-2006 03:45 PM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 09:14 PM.



Motorcycle News, Videos and Reviews
Honda Grom Forum Harley Davidson Forum Honda 600RR Kawasaki Forum Yamaha R6 Forum Yamaha FZ-09 Forum
1199 Panigale Forum Roadglide Forum Honda CBR1000 Forum Vulcan Forum Yamaha R1 Forum Yamaha R3 Forum
Ducati Monster Forum Harley Forums Honda CBR250R Forum ZX10R Forum Star Raider Forum Yamaha Viking Forum
Suzuki GSXR Forum V-Rod Forums Honda Shadow Forum Kawasaki Motorcycle Forum Star Warrior Forum KTM Duke 390 Forum
SV650 Forum BMW S1000RR Forum Honda Fury Forum Kawasaki Versys Forum Drag Racing Forum Ducati 899 Panigale Forum
Suzuki V-Strom BMW K1600 Triumph Forum Victory Forums Sportbikes BMW NineT Forum
Volusia Forum BMW F800 Forum Triumph 675 Forum MV Agusta Forum HD Street Forum Suzuki GW250 Forum
Yamaha Motorcycles Victory Gunner Forum Honda Vultus Forum

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.

Search Engine Optimization by vBSEO 3.6.0