Smooth bonnie

Triton Thrasher · Saturday at 11:49 AM

Onder said:
If T140's did not get balanced then it is seriously disturbing that Royal Enfield Inters were dynamically balanced. If they figured it out what on earth happened to Triumph?
My '73 Bonnie could remove your tooth fillings. By 71 BSA removed anything bolted on to it.

Enfield were making tiny numbers of Series 2 Interceptors, compared with Meriden’s output.

baz · Saturday at 11:53 AM

I had an oif t120v that vibrated incredible badly but it was bored to +60 without any rebalancing so that may have played a part
I had a tiger tr7 that was ok ish
My t140e was pretty good even after I changed the 7.8 -1 pistons for some t140v 8.5 -1 type
Worst vibrating bike I ever owned was a 750 commando motor fitted in a wide line
Closely followed by a plunger A10 and a BSA B44 that some idiot thought he could change his own big end bearing and re align the crank himself with a big lead hammer ,tyre levers,and a pair of steel wedges!!!

Triton Thrasher · Saturday at 12:11 PM

I arbitrarily raised the balance factor on my current pre-unit 650 Triton by taking off the crankcase filter and cover and enlarging a hole in the flywheel with a hand-held drill.

baz · Saturday at 12:53 PM

Triton Thrasher said:
I arbitrarily raised the balance factor on my current pre-unit 650 Triton by taking off the crankcase filter and cover and enlarging a hole in the flywheel with a hand-held drill.

What difference did it make?

Triton Thrasher · Saturday at 12:55 PM

baz said:
What difference did it make?

I think it helped a bit.

Onder · Sunday at 11:31 AM

Helped a bit?.... well he did say he used a drill....

Onder · Sunday at 11:35 AM

Triton Thrasher said:
Enfield were making tiny numbers of Series 2 Interceptors, compared with Meriden’s output.

Yes but then the workforce was tiny too. Triumph had the people, brains and money to get or make a balance machine. Odd that Hele did not go there. One of the most noticeable things about later brit bikes was bad vibration. Trident was one answer, Isolastic suspension another so clear that the problem was well known and worth addressing.

Triton Thrasher · Sunday at 11:38 AM

Onder said:
Helped a bit?.... well he did say he used a drill....

There’s a new twist!

Onder · Sunday at 11:47 AM

yeah it was SUMP thin else...

cliffa · 2024-10-15T02:52:46-0600

As mentioned earlier, some pics or the AV or “Enforcer” frame as Triumph called it. Apparently only 50 bikes were made utilizing it, which is a shame.

Bottom engine mounts..

Rear engine mount and pivot.

It would be pretty simple for a welder / fabricator to replicate.

baz · 2024-10-15T03:09:03-0600

cliffa said:
As mentioned earlier, some pics or the AV or “Enforcer” frame as Triumph called it. Apparently only 50 bikes were made utilizing it, which is a shame.

View attachment 116722

Bottom engine mounts..

View attachment 116721

Rear engine mount and pivot.

View attachment 116720
It would be pretty simple for a welder / fabricator to replicate.

How did they mount the silencers?
The main reason I moved away from triumph twins was the vibration ,that and the clutch
This setup may have kept me with them for longer

robs ss · 2024-10-15T03:27:30-0600

That is an ENORMOUSLY wide engine for a twin - wider than a honda 4 maybe?

If you hate a big twin's vibes that much - just buy an e-bike

baz · 2024-10-15T03:37:19-0600

robs ss said:
That is an ENORMOUSLY wide engine for a twin - wider than a honda 4 maybe?

If you hate a big twin's vibes that much - just buy an e-bike

Or buy a commando as many did I guess

cliffa · 2024-10-15T03:59:55-0600

baz said:
How did they mount the silencers?
The main reason I moved away from triumph twins was the vibration ,that and the clutch
This setup may have kept me with them for longer

I’m not sure about the exhaust mounting TBH, but I know the strengthened the front downpipes brackets. ( I always thought they looked tinny anyway (and crap)). But I guess they used bobbin mounts like the Commando?

baz · 2024-10-15T04:13:21-0600

cliffa said:
I’m not sure about the exhaust mounting TBH, but I know the strengthened the front downpipes brackets. ( I always thought they looked tinny anyway (and crap)). But I guess they used bobbin mounts like the Commando?

I was thinking there'd be a lot more movement at the exhaust mount with the motor moving in an arc
But I guess if it's only moving a fraction at the front of the motor it'd be fine

Smooth bonnie

Similar threads