Author Topic: Amal 10TT9 Slide Sizing  (Read 250 times)

Online Seabee

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Amal 10TT9 Slide Sizing
« on: 19.03. 2021 18:42 »
Hi guys,

I need to determine what size slide is in my carb. I'm still having trouble with a way too fast idle. I need to see if I have the wrong size cutaway. The slide is a little worn, but it does bottom out and the jets are correct. I have to retard the timing to get it to idle down to a proper RPM.

Seabee
1961 Super Rocket
1957 Road Rocket
2009 Harley Electra Glide Classic
1993 Harley Springer Softtail
1970 Harley Sportster Chopper
1957 Harley Panhead Chopper
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Southern Illinois, USA

Online Klaus

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Re: Amal 10TT9 Slide Sizing
« Reply #1 on: 19.03. 2021 19:28 »
hi Seabee,
the cutaway is not responisble for idling.
Its the airscrew, tourning out the mixture is richer, turn in it will get weakThere is a blindscrew at the opposide from the airscrew. If you turn it off there is a realy little hole (ca 0.7 mm) visible where the fuel gets thrue. May be this is blocked.

cheers Klaus


If you think, everything is under control, you are not fast enought.

Online muskrat

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Re: Amal 10TT9 Slide Sizing
« Reply #2 on: 19.03. 2021 19:34 »
G'day Seabee.
Slide cutaway is measured in 1/16 inch. #3 slide has a cutaway of 3/16".
A worn slide will be allowing air to pass around it giving a lean mixture that will hinder idle mixture.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
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Online Seabee

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Re: Amal 10TT9 Slide Sizing
« Reply #3 on: 20.03. 2021 02:34 »
Thanks Klaus and Musky. It has been  very frustrating trying to get it to idle slower. It seems to have a good mix as the revs are steady, just too damn high! I love having the correct carb on the RR. It is my "show" bike, so it gets ridden very little anyway. The SR is the work horse and is a great rider. I'm breaking in the hi-comp, 357 cam engine I built for it over the winter. It is much harder to kick over with the high comp pistons, but has a nice bark to it! *smile*
1961 Super Rocket
1957 Road Rocket
2009 Harley Electra Glide Classic
1993 Harley Springer Softtail
1970 Harley Sportster Chopper
1957 Harley Panhead Chopper
1982 Yamaha XT550
2001 KTM EXC 400
1970 Honda CT70
Southern Illinois, USA

Online Joolstacho

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Re: Amal 10TT9 Slide Sizing
« Reply #4 on: 04.04. 2021 00:36 »
BTW if anyone has a 'wrong-sided' new TT slide they want to swap.... I have a genuine one I bought about 30 years ago, but it's a Left Hand one and I need a Right Hand one. 10TT9 carb (for a Velo).

Online Bsareg

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Re: Amal 10TT9 Slide Sizing
« Reply #5 on: 04.04. 2021 11:04 »
I'm showing my ignorance here, but I've run a T10TT carb on my Enfield sprinter for 30yrs and haven't known about left and right handed slides. I've just bought TT slides. Have I been lucky and what's the difference?
C11,B40,B44 Victor,A10,RGS,M21,Rocket3,REBSA

Online Joolstacho

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Re: Amal 10TT9 Slide Sizing
« Reply #6 on: 04.04. 2021 11:24 »
On the inside face of the slide there's a what I can only call a shallow tongue, this mates and slides within a slot in the jet block (that's what they call it), so the slide is held at the right angle to the airflow by this mating slot. Otherwise the slide would be free to rotate. An option for me might be to remove the jet block and machine a slot in it at 180deg to the existing one.

Online Bsareg

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Re: Amal 10TT9 Slide Sizing
« Reply #7 on: 04.04. 2021 11:31 »
I know the piece you're talking about, I'll check my spare slides, but I've never noticed a difference.
C11,B40,B44 Victor,A10,RGS,M21,Rocket3,REBSA

Online Klaus

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Re: Amal 10TT9 Slide Sizing
« Reply #8 on: 04.04. 2021 12:10 »
Hi Joolstacho,

you have a 1.1/16 TT Carb, only this size has the righthand slides. Its because the chocke slide is on the opposid side to the other TT carbs. It s hard to find the angled floatboals, for the right side.
Yes you can, slot  the jetblock to use the left ones.

cheers Klaus


If you think, everything is under control, you are not fast enought.

Online Joolstacho

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Re: Amal 10TT9 Slide Sizing
« Reply #9 on: 04.04. 2021 12:56 »
Close mate, it's actually 1 3/16"  (30mm) came as original equipment on my '64 Venom Clubman. I've been running Concentrics on it for about 45 years, and I thought it would be good to get it back to original with the TT. (yes the float angle is correct). I'll pull out the jet block and probably machine the slot to suit my lovely new slide.

Online Bsareg

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Re: Amal 10TT9 Slide Sizing
« Reply #10 on: 07.04. 2021 15:58 »
I've checked my slides and they all have that tongue on the left looking from the cutaway with the slide upright.
C11,B40,B44 Victor,A10,RGS,M21,Rocket3,REBSA

Online Joolstacho

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Re: Amal 10TT9 Slide Sizing
« Reply #11 on: 08.04. 2021 00:58 »
Here are mine. The original one that came with the Velo when new- on the right. Note slot on the left.
The new one on the left, slot on the right. This slide is marked in pencil: LEFT HAND 10??? 175/559 -Amal marked I'd bet.

Online Bsareg

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Re: Amal 10TT9 Slide Sizing
« Reply #12 on: 08.04. 2021 12:15 »
Looking at my Amal spares list, all Velo tt carbs are fitted with the standard tt slide (throttle valve in Amal speak). Number is 375/3114 to 3117, the last No being the cut away. No mention of a left hander. They should be available from Burlens. Here's a selection of mine, all (worn) and are the same type with diferent  cutaways.
C11,B40,B44 Victor,A10,RGS,M21,Rocket3,REBSA