• Welcome to the website of the Vincent H.R.D. Owners Club.

    Should you have any questions relating to the Vincent H.R.D. Owners Club, or Vincent H.R.D. motorcycles in general, please contact Graham Smith, Hon. Editor and Webmaster by calling 07977 001 025 or please CLICK HERE.

    You are unrecognised, and therefore, only have VERY restricted access to the many features of this website.

    If you have previously registered to use this forum, you should log in now. CLICK HERE.

    If you have never registered to use this website before, please CLICK HERE.

ET: Engine (Twin) Mk2 Amals


Bill Thomas

Well Known and Active Website User
VOC Member
Any body know about Mk2 s, I fitted one on my Comet, Flash Spec', A year or so ago, Thrilled to bits, 30 mm. Jetted as they supply.
Just fitted 2 to my ex L/ning, Same setting, Same size, No Fast idle !, When on choke.
Goes like stink, Mind you, Just got off the Comet !!.
I wonder if the slide, 3 , Is too rich ?, And that is upsetting the choke ?.
I do feel it's a nat's rich On the slide, But just done 50 miles, Slow and fast ish, And it has not messed a plug up yet.
Good hot starting, And they look !, so Fast !.
Can't tell you how small amount of throttle = 70 mph !!.
Cheers Bill.
 

Chris Launders

Well Known and Active Website User
VOC Member
Bill you probably want a different choke jet, don't know which way though, they're the same as pilot jets and are in the float bowl down the hole where the choke tube goes. Not many people notice them !!!
 

Bill Thomas

Well Known and Active Website User
VOC Member
Thank's Chris, I know the jet you are saying, It was the only thread or jet that had not been beggered.
The last owner could not have known it was there !!.
Cheers Bill.
 

stu spalding

Well Known and Active Website User
VOC Member
Just watch out for slides coated with teflon or similar on Mk2 concentrics. They're great until the coating wears through when they jam solid as soon as it rains. The materials of slide and body are totally non compatible. Cheers, Stu.
 

Bill Thomas

Well Known and Active Website User
VOC Member
Thank's Roy, So yours is rich enough to start from cold without choke ?.
I thought mine was a bit rich, But took the plugs out last night, And they don't look bad.
I first kicked mine with the chokes on a few times, Then chokes off and it started.
Started well after a long chat by the riverside, No choke.
I have only been out once , So early days.
Holds 70 mph with just a nat's of throttle, Don't know why we need Big Carb's !!.
Cheers Bill.
 

bmetcalf

Well Known and Active Website User
VOC Member
One time I was riding beside Glenn Shriver who was on his Rapide in solo trim at about 60 mph. No air filters, so I was able to see how much of the slide on the rear carb was showing. Very surprising!
 

Bill Thomas

Well Known and Active Website User
VOC Member
Thank's Bruce, I was thinking it might be because it was running a bit rich ?.
But I think it would have messed a plug up by now ?.
Never knew these Mk2 s have been around since 1974 !, Where have I been !.
To me they are much better than Mk1 s, Made in Alloy, Much lighter and better made, Solid slide ,
So better air flow, I would feel more happy with a fast idle on choke, Like my Comet.
Rubber mounts, So no heat build up ?.
I was chatting to a lad with L plates, Down at the coast, Long chat !, And when I came to start it, I wanted to impress !!,This was the Comet, So put the choke on, Super, Fast idle for a few seconds, Top Job.
Cheers Bill.
 

Bill Thomas

Well Known and Active Website User
VOC Member
Bill, just a smidge of choke first off, rest of the day starts well, except with an audience! Roy.
Thanks Roy, They say in the Book, If you use more than a 1/4 throttle, It stops the choke from working.
I think the Comet is a 50 jet, I thought that would be too rich, But seems to work OK,
I will have to take them apart again.
Love the look of them.DSCN0038.JPG
 

Chris Launders

Well Known and Active Website User
VOC Member
While I was setting up my MK1s last autumn I marked the twistgrip so I knew where in the carbs range I was at any given speed, found I was still on the slide (1/8th-1/4 open) at 50mph.
 

Bill Thomas

Well Known and Active Website User
VOC Member
Just checked the L/ning, The start jets are 50, Same as the Comet = Strange !!. Cheers Bill.
 

Bill Thomas

Well Known and Active Website User
VOC Member
Not sure if anybody is interested, But an update, Thought the slow running was a bit wooly.
So hand cut the slides a bit !!, Maybe a bit too much.
Now have a bad misfire, I would have put money on Ignition, I would have lost !!.
Checked the Rita out and fitted new coils.
Took the rear carb' apart , Good clean.
Lifted the needle one notch in the rear, It was the rear plug, Wetting/Oiling ?
Fitted both starter jets, Now 35, Was 50.
Now have a fast idle with the chokes on.
Still not nice, Made the pilot richer to try to overcome having taken too much off the slides.
Now 1 turn out.
I find the pilot setting affects higher up the range than I thought on Mk2 s.
Slow running now nice, Which makes such a difference with the standard clutch, To put into first gear.
Just been for a ride, best ever !, 40 mph so smooth + roll on from there, Goes like stink !, L/ning spec'.
Cheers Bill.
 

Bill Thomas

Well Known and Active Website User
VOC Member
Just fitted new number 3 slides, On the L/ning, I got them at Netley, From Surry Cycles,
The new ones have a small hole in the bottom of the slide !!.
When I first fitted Mk2 s, I found them a bit rich, At the bottom end, And had to recut them, Now these have gone on and have found them good, Wonder if that was what the hole is for ?.
Cheers Bill.
 

vibrac

Well Known and Active Website User
VOC Member
Just fitted new number 3 slides, On the L/ning, I got them at Netley, From Surry Cycles,
The new ones have a small hole in the bottom of the slide !!.
When I first fitted Mk2 s, I found them a bit rich, At the bottom end, And had to recut them, Now these have gone on and have found them good, Wonder if that was what the hole is for ?.
Cheers Bill.
Tickover (thats what we did to TT on the road) or how about to reduce pressure of slide against back wall on closed throttle
 

Bill Thomas

Well Known and Active Website User
VOC Member
I just had the plugs out and it's still running rich, But doesn't feel bad on the road,
I changed the slides because, As Stu' says, It started jamming last year, But silly me, I have bought the same type !!. But the pressure might be some of the problem.
The new slides are also different inside at the base, As well as the hole.
May try lowering the needle ?.
The Bike really does fly !.
I was thinking of buying a modern fast bike, But this one scares the Wotsits out of me :) .
Cheers Bill.
 

Bill Thomas

Well Known and Active Website User
VOC Member
Just had a thought, This must have the light flywheels, And high first gear, First and second feel close,
Feels like a a Triumph, Banging through gears !.
Cheers Bill.
 

robin

Well Known and Active Website User
VOC Member
Mk2 Amal 2928 settings;- Pilot 20, Needle jet 105 (weak), Slide 3 1/2 to 4, main 190/200 and 5/16" pipe work throughout. Especially the petrol taps.
 

Top