96 T'Bird RPM/Speed? - Triumph Forum: Triumph Rat Motorcycle Forums
Hinckley Classic Triples 885cc Classic Styled T3's: Legend, Thunderbird, Thunderbird Sport & Adventurer.

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 23 (permalink) Old 07-06-2019, 03:04 AM Thread Starter
Minitwins
New Member
 
Join Date: Jun 2019
Posts: 13
96 T'Bird RPM/Speed?

Hello there,
My name is Joel, I am new to Triumphrat.net. I have a 96 T'Bird which I bought in 2006. I am from WA but recently moved to the south coast area of NSW. I am wanting some info/advice regarding the RPM that my bike is doing at highway speeds. At 110kms the RPM is 5000, at 100 kms it's 4500 and at 90 kms it's 4000. The sprockets are standard so is it just the engine getting old? It feels like I need another gear! cheers
Chillidicko is offline  
Sponsored Links
Advertisement
 
post #2 of 23 (permalink) Old 07-06-2019, 04:42 AM
Newbie
New Member
 
tbird pat's Avatar
 
Join Date: Jun 2019
Posts: 4
Mine is a 2000 model with the six speed gearbox and it sits just under 4,000 rpm at a 100ks by memory. I know what one of the chain mobs list as standard on mine is different to my handbook. I'm working away at present and can't check that for you. A worn or old motor would still be doing the same rpm, check your clutch isn't slipping.
tbird pat is offline  
post #3 of 23 (permalink) Old 07-06-2019, 10:50 PM Thread Starter
Minitwins
New Member
 
Join Date: Jun 2019
Posts: 13
Thanks for the reply Pat

How can I check if the clutch is slipping?
Chillidicko is offline  
 
post #4 of 23 (permalink) Old 07-07-2019, 07:23 AM
Newbie
New Member
 
tbird pat's Avatar
 
Join Date: Jun 2019
Posts: 4
You can usually feel something is not right when putting the engine under load and accelerating hard ie: sudden increase in revs that doesn't equate to similar increase in road speed. Also you say you have had the bike since 06, has it always done that many revs, have you changed your chain and sprockets recently and been given the wrong advice on what is standard gearing. Standard gearing can differ between countries on some bikes. I imagine a 96 is probably a 5 speed and it could be the reason they went to a 6 speed, not sure on final drive ratio, however these motors are capable enough to pull the taller gearing that would suit Australian conditions and may be worth experimenting. Noticed you have add for fork springs bought from yss in s.a. I have a post on here asking about yss rear shock on t-bird. If you haven't seen it and know someone who has tried one it would be good to hear about it. Cheers
tbird pat is offline  
post #5 of 23 (permalink) Old 07-07-2019, 06:36 PM
Site Supporter
Pole Position
Main Motorcycle: '98 Thunderbird Sport
Lifetime Premium
 
denny's Avatar
 
Join Date: Aug 2003
Location: Indianapolis, IN
Posts: 3,772
Other Motorcycle: '95 Tbird - Project
Garage
Have you cleaned and lubricated the speedometer cable lately?
Does the needle bounce around?

Cheers,Denny
denny is offline  
post #6 of 23 (permalink) Old 07-07-2019, 08:42 PM Thread Starter
Minitwins
New Member
 
Join Date: Jun 2019
Posts: 13
Thanks Pat.
The bike is a 5 speed and the problem does seem to have got worse over the last few years.
Stretching the brain cells and thinking back to the first few years I think the RPM at 100 k's was around 4000.
I did fit new sprockets and chain a few years ago which I bought from JCS in Perth. Considered changing the sprocket(s) to give lower RPM at top speed but decided against it and bought the standard kit. I think it was 46 teeth on the rear, don't recall what the front sprocket is.
From what you have said it sounds like I am up for a new clutch.
I don't know anyone who has tried out a YSS rear shock but I wouldn't recommend dealing with the guy at YSS in Adelaide, cheers
Chillidicko is offline  
post #7 of 23 (permalink) Old 07-07-2019, 08:46 PM Thread Starter
Minitwins
New Member
 
Join Date: Jun 2019
Posts: 13
Thanks Denny.
I haven't lubed the speedo cable but it doesn't seem to bounce around.
The tacho does swing around a bit sometimes then other times it nice and stable!?
Chillidicko is offline  
post #8 of 23 (permalink) Old 07-07-2019, 10:34 PM
jvb
Supersport 400
Main Motorcycle: .
Member
 
jvb's Avatar
 
Join Date: Feb 2004
Location: Melbourne - Australia
Posts: 96
18T/43T.
In 5th gear, at 100km/h, I sit around 4400rpm.
I think 18T/43T is standard. If your front is 18T and rear 46T, your rpm would be higher at 100km/h.

1954 Zündapp DB255
1973 T140V Bonneville
1995 Thunderbird 900
jvb is offline  
post #9 of 23 (permalink) Old 07-07-2019, 11:07 PM
Site Supporter
Pole Position
Main Motorcycle: '98 Thunderbird Sport
Lifetime Premium
 
denny's Avatar
 
Join Date: Aug 2003
Location: Indianapolis, IN
Posts: 3,772
Other Motorcycle: '95 Tbird - Project
Garage
Some bikes came with 18T front and others with 17T.
AFAIK. all came original with 43T rear.


Since your tach is bouncing around some maybe it is just erroneous tachometer reading?

The symptoms of a slipping clutch would be the same for any motorcycle......So any decent motorcycle mechanic would be able to help diagnose that.

What about the oil? Do you have motorcycle oil in it? That can cause some slipping of the clutch.

If that is the case... You can run some conventional i.e. not synthetic motorcycle oil for a couple of thousand miles then return to synthetic motorcycle oil and it should be fine. Don't ask me how I know that works...

Cheers,Denny
denny is offline  
post #10 of 23 (permalink) Old 07-08-2019, 03:14 PM
WSC
Site Supporter
Moto Grand Prix
Main Motorcycle: '07 Dyna Low Rider
Lifetime Premium
 
WSC's Avatar
 
Join Date: Apr 2012
Location: New Hampshire
Posts: 3,128
Other Motorcycle: '99 Legend TT
Extra Motorcycle: Thunderbolt, T150V
Your clutch cannot be slipping in a manner that would give you a predictable change in cruise RPM. If it slips, it will hold at low power levels and in lower gears, and at higher power levels and in higher gears it will allow the engine to accelerate, as if you had intentionally slipped the clutch. The whole drive train is gears, chains and sprockets. Nothing in it can allow a gradual change in the RPM/KPH relationship.

If you changed to a 46 tooth rear sprocket, than that's when the change occurred, and it was immediate, not gradual. A weak engine will affect your ability to accelerate, but not the relationship between RPM and KPH. It's sort of digital; either it goes the right speed or it doesn't go at all.

John
Laconia Bike Week 2019 - See you all next year
2007 HD FXDL
1999 Legend TT
1975 T150V, 1968 BSA Thunderbolt, x2004 Thunderbird Sport
WSC is online now  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options
All posts must adhere to Forum Rules

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:
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:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not 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

 
For the best viewing experience please update your browser to Google Chrome