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Author Topic: 850T vs T3  (Read 1316 times)
jon
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« on: May 30, 2012, 05:20:18 AM »
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Hello.

I am the proud owner of a 1975 850T. Recently, I bought a 1976 850 T3 California with only 36000 km on the clock, this bike looks nice... after setting it up, points, carburetion, synchronization and etc... I feel the T3 is less powerful than the T. Perhaps is the effect of the wind shield... but I would like to hear opinions in this matter.





Regards from the Basque Country
Jon

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« Reply #1 on: May 30, 2012, 05:46:45 AM »
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What a windscreen !!!!!! Its looks as aero dynamic as brick wall. Shocked
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« Reply #2 on: May 30, 2012, 06:08:11 AM »
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Valve Chain Tensioner was an insidious culprit on mine. After the Valtec, power was noticeably improved.
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« Reply #3 on: May 30, 2012, 06:47:36 AM »
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Some motors got the mojo.
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chuck peterson
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« Reply #4 on: May 30, 2012, 07:50:40 AM »
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t3 has two heavier crash bars
heavier saddle
barn door windscreen
floor board set up instead of pegs
rear passenger grab rail
bigger handle bars

all of that little stuff adds up...even at 50 to 75 lbs total it'll make the T feel faster, lighter, nimbler..
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« Reply #5 on: May 30, 2012, 08:00:00 AM »
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I always thought T's were a bit better than T-3's, cept for brakes cause of ign timing.
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« Reply #6 on: May 30, 2012, 10:31:05 AM »
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Also different jetting on carbs, slightly different final gearing (850-T = 8/35 = 4.375; 850-T3 = 7/33 = 4.714) and different advance curves (springs) and timing.
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« Reply #7 on: May 30, 2012, 10:37:30 AM »
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Also different jetting on carbs, slightly different final gearing (850-T = 8/35 = 4.375; 850-T3 = 7/33 = 4.714) and different advance curves (springs) and timing.

The 850-T had an 8/37 gearset (4.625) so that's only slightly different than the T3. Ambassadors and the V7 Sport were the only Guzzis that used the 8/35 gearset AFAIK.
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Charlie
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« Reply #8 on: May 30, 2012, 11:08:20 AM »
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Don't forget....the Ts were Interceptors, remember? 
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« Reply #9 on: May 30, 2012, 11:34:53 AM »
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I think Chuck is right.  A few pounds here and there along with the barn door windshield would make quite a difference.
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« Reply #10 on: May 30, 2012, 01:35:43 PM »
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Agur!  Nola zira?

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JBU
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« Reply #11 on: May 30, 2012, 02:04:52 PM »
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A friends 850-T was as fast as my Lemans III. No kidding. Sometimes it has o do with the looseness of the motor...
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jon
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« Reply #12 on: May 31, 2012, 05:42:04 PM »
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Agur!  Nola zira?
Oso ondo eta zu?

To explain everybody... the lines JBU wrote are Basque language my mother tongue.

Translating them:
JBU: Hello! How are you?
JON: Fine, and you?

Thank you JBU for noticing where I am from... perhaps you know some Basque people around there...

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1975 Moto Guzzi 850T
1976 Moto Guzzi 850T3 California
1986 Moto Guzzi V65C
---
1975 Rickman CR900
1990 Kawasaki GPZ 900R
---
1965 Ducati 160 TS
1969 Vespa 160
1986 Suzuki TS125X
jon
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« Reply #13 on: May 31, 2012, 06:00:21 PM »
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Thank you all for your answers.

They have helped me to meditate about all  these matters.

About the distribution chain tensioner, recently I have changed the chain and fitted a valtec type tensioner... It is true the engine gains a lot with this simple mod, specially smoothness.

The windscreen is big, I will test the bike without it... is very easy to remove it.

Regarding the weigh I can compare the T with the gas tank full vs the T3 with the gas tank near empty.

The different distributor is another point,  I am tempted to swap distributors between both to see what happens.

About the different jetting, perhaps the reason is related to the unrestricted air admission on the T vs the T3. On the T3 I have the original airbox but recently I have fitted a new K&N filter element inside.

As soon as I can get more conclusions I will post them here.








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1975 Moto Guzzi 850T
1976 Moto Guzzi 850T3 California
1986 Moto Guzzi V65C
---
1975 Rickman CR900
1990 Kawasaki GPZ 900R
---
1965 Ducati 160 TS
1969 Vespa 160
1986 Suzuki TS125X
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« Reply #14 on: May 31, 2012, 07:36:28 PM »
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I'm looking forward to your conclusions.
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John F.
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Gone but not forgotten: '07 Nevada, '76-'84-'98 SPEVert, '76 850 T3, '84 V65, '01 Stone Metal, '05 Nevada

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« Reply #15 on: May 31, 2012, 07:43:27 PM »
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My 850-T was crazy fast and a blast to ride. I think they are better looking than T-3s as well, despite the better brakes on the latter.
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chuck peterson
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« Reply #16 on: May 31, 2012, 11:01:43 PM »
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ah, one more, T's have one front rotor, T3's have 2 front rotors, double the weight on the springs..
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Matt
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« Reply #17 on: June 01, 2012, 08:59:35 AM »
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Years ago the local Guzzi gurus dissected a T and T-3 distributor to see the differences, they're identical except for lighter advance springs on the T bringing it to full advance faster. The T-3 didn't get to full advance until well past working RPM while the T was there when it needed to be.
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Matt
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« Reply #18 on: June 01, 2012, 09:58:31 AM »
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Jon,

Yes I know quite a few Basque people.  My parents are both from there.  Mother  (Sorhapurru) near St Palais, father Armendaritz.  I have plenty of Aunts, Uncles and cousins living all over the basque country.

JBU= JoŽl Bertrand Urruty
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JBU

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