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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 01-06-2010, 02:17 PM   #1 (permalink)
bum
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750 conversion

How much power and torque do you think I would gain by going from 650cc to 750cc?
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Old 01-06-2010, 03:02 PM   #2 (permalink)
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Not enough to make it worthwhile unless you are going racing, or your old top end is already tired and/or smoking.

If you have unlimited play money, all bets are off!
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Old 01-06-2010, 05:17 PM   #3 (permalink)
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750 upgrade

In my opinion the long stroke 750 is the most fun of all the Triumphs to ride and that's what you get when you put a 750 kit on a unit 650. If you match it with good cams, carbs and pipes you'll easily have enough power to get yourself into trouble. If you don't re-balance the thing, however, you may want to push it off into the lake.
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Old 01-06-2010, 10:14 PM   #4 (permalink)
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I agree with the last comment, the Morgo or Routt 650-750
conversion is really good, use with /7016 + 9990 cams. Not too radical and goes really well.

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Old 01-06-2010, 10:33 PM   #5 (permalink)
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Well in over 31 years I have never found the vibration on my 70 750 to be objectionable. In fact a good friend of mine weighed the stock 650 pistons and the 750 kit pistons and found no difference.
Anyone who complains about the vibration on a Triumph should maybe get a few tools and check all the nuts and bolts.

jus my pinion

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Old 01-06-2010, 10:43 PM   #6 (permalink)
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Quote:
Originally Posted by NickL View Post
use with /7016 + 9990 cams. Not too radical and goes really well.
Do your cams there corralate with any of these?

http://www.megacyclecams.com/catalog.../page%2017.pdf

And if not. Who sells them?
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Old 01-08-2010, 04:09 AM   #7 (permalink)
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My Thoughts (I have an M.A.P. big bore kit on a 71 T120RV)

I used an earlier/lighter flywheel crank and had the rotating assembly dynamically balanced.

at idle on the race stand the bike does not creep. the vibrations are signifiganty reduced. also, ran it during the initial run in without the head steady (per the M.A.P. directions).

Performance is snappier, more initial torque and spins up to RPM quicker and with more punch. it pulls the front end loose through fourth gear.

my A65 BSA's will eventually get the same Dynamic Balance treatment.

Needless to say, I am impressed.
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Old 01-08-2010, 07:12 AM   #8 (permalink)
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My Thoughts (I have an M.A.P. big bore kit on a 71 T120RV)

I used an earlier/lighter flywheel crank and had the rotating assembly dynamically balanced.
Do you recall what it was ballanced to? 75% 50% etc.
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Old 01-08-2010, 10:07 AM   #9 (permalink)
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I guess I ought to clarify my reply, as it was a simple, direct answer to the sole upgrade from 650 to 750.

Without camshaft upgrade(s), exhaust and carb tuning, the big bore upgrade by itself is quite limited.

The cams "wake it up", but are still hindered by the available flow capacity on both intake and exhaust.

The "full package" isn't as stark as a modern 650 vs 750, but is defnitely a seat-of-the-pants noticeable difference.
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Old 01-08-2010, 12:04 PM   #10 (permalink)
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Thanks guys. I'll think it over during my engine tear down this winter.
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