Author Topic: T 100 490cc 1968  (Read 493 times)

Offline dynamic

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T 100 490cc 1968
« on: August 11, 2018, 10:46:57 AM »
I have a T 100 68 and notice the ammeter needle  ( Lucas type) stays in the centre of the dial just fluctuating left to right very slightly even at cruising speed 50/60 mph,

 with the engine running and multimeter on the battery I get a constant reading of 13 + volts am I to assume the ammeter has had its time looks like the original from 68 or can it be overhauled

PS after a ride the battery always shows in the region of 12.7 +

Offline mini-me

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Re: T 100 490cc 1968
« Reply #1 on: August 11, 2018, 11:07:58 AM »
it's like that because the battery is fully charged.

time to worry is when its on full discharge all the time.

Offline iansoady

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Re: T 100 490cc 1968
« Reply #2 on: August 11, 2018, 12:14:09 PM »
... or full charge........
Ian
1952 Norton ES2
1982 Moto Guzzi V50

Offline dynamic

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Re: T 100 490cc 1968
« Reply #3 on: August 11, 2018, 05:44:12 PM »
thanks for the posts guys I will ride on of peaceful mind/uneducated bliss

PS. my kickstart spring has 2 inch of "slack" is it difficult to change the return spring ?

Offline Rex

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Re: T 100 490cc 1968
« Reply #4 on: August 11, 2018, 06:29:50 PM »
That's the trouble with ammeters, oil pressure gauges etc...more sh*t to worry about. As for the k/s spring do you mean 2" before the ratchet engages?

Offline dynamic

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Re: T 100 490cc 1968
« Reply #5 on: August 12, 2018, 09:27:34 AM »
Hi Rex no not 2 inches before ratchet engages the ratchet turns the motor over its just that after starting I can pull the kickstart up into its normal position and the return spring seems slack and whilst on the move the kickstart falls back 2 inches I am guessing the return spring has worn over the last few ( 50 ) years I hope this may make sense to you, reading the manual it looks like I can get access to the return spring by removing the G/box outer case where the clutch cable hooks up ? 

Offline Rex

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Re: T 100 490cc 1968
« Reply #6 on: August 12, 2018, 09:31:10 AM »
Yep, that's where the spring is. Does it stay "pulled up" or does it go back down again?

Offline mini-me

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Re: T 100 490cc 1968
« Reply #7 on: August 12, 2018, 10:28:31 AM »
seems like you need a new spring.

either that or to get into the spirit of the 1960s/70s, ::) use a bungee cord, or aerolastic  as I still refer to them as. ???

easy enough job, lay the bike on its side and saves draining the oil.

Offline dynamic

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Re: T 100 490cc 1968
« Reply #8 on: August 13, 2018, 08:28:41 AM »
Hi Rex & Mini me thanks for your inputs the kickstart does not stay in its most upright position just falls back the 2 inches as above

I will remove the g/box case and see what parts I need to order


PS. watch this space many more "so obvious" questions to follow ...

Offline mini-me

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Re: T 100 490cc 1968
« Reply #9 on: August 13, 2018, 11:47:01 AM »
you'll need to learn how to wind the new spring up and hold it in position as you replace the cover.

new springs often have sharp edges, have Elastoplast handy ::)

Offline TGR90B

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Re: T 100 490cc 1968
« Reply #10 on: August 13, 2018, 04:45:00 PM »
An absolute bas**rd of a job to get the spring on. Could have been me I suppose, but got there in the end. I found a bit of cussing helped.
Getting grumpy.

Offline Rex

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Re: T 100 490cc 1968
« Reply #11 on: August 13, 2018, 05:24:08 PM »
Two things here....make sure the spring plate fits on the flats of the shaft easily and dress it with a file if it doesn't, and drill two holes diametrically opposite each other in the plate and use a pair of long/snipe nosed pliers in these holes to turn the plate and tension the spring.
As said, the sharp ends of the spring will draw blood otherwise.

Offline dynamic

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Re: T 100 490cc 1968
« Reply #12 on: August 14, 2018, 05:19:20 PM »
bungee it is then thanks for the input guys

Offline Rex

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Re: T 100 490cc 1968
« Reply #13 on: August 14, 2018, 05:42:02 PM »
It's a ten minute job...there'll be lots of those on an old bike, so why not do it properly and be done with it?

Offline mini-me

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Re: T 100 490cc 1968
« Reply #14 on: August 14, 2018, 06:44:52 PM »
Now you'll need one of these

and you'll be right back in the 60s