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750 commando and tm34 mm Mikuni

Classic Norton Commando Motorcycles.

750 commando and tm34 mm Mikuni

Postby chrisshropshire » Mon Mar 20, 2017 11:25 am

Hi Chaps , I am just about to start sorting my 750 fastback
I'm fitting a new ignition and was thinking of trying a single tm 34 flat slide carb hoping for better performance than a vm 34 or 36 mm but less faff than refitting a new pair of amals
so my question is have any of you fine fellows had a go with this set up ? if son how did it work for you.
Best regards Chris

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Re: 750 commando and tm34 mm Mikuni

Postby comnoz » Mon Mar 20, 2017 12:04 pm

chrisshropshire wrote:Hi Chaps , I am just about to start sorting my 750 fastback
I'm fitting a new ignition and was thinking of trying a single tm 34 flat slide carb hoping for better performance than a vm 34 or 36 mm but less faff than refitting a new pair of amals
so my question is have any of you fine fellows had a go with this set up ? if son how did it work for you.
Best regards Chris


Better low speed performance.
Same top end performance.
Slide tended to stick when riding in the rain... Jim
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Re: 750 commando and tm34 mm Mikuni

Postby chrisshropshire » Mon Mar 20, 2017 2:01 pm

Thanks Jim
Can I ask what you are running now ?

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Re: 750 commando and tm34 mm Mikuni

Postby madass140 » Mon Mar 20, 2017 4:49 pm

"Can I ask what you are running now ?"
get ready!
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Re: 750 commando and tm34 mm Mikuni

Postby 1up3down » Mon Mar 20, 2017 6:00 pm

but less faff than refitting a new pair of amals


what fall off, assuming that is what faff means?

source for this information, thanks

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Re: 750 commando and tm34 mm Mikuni

Postby baz » Mon Mar 20, 2017 6:14 pm

chrisshropshire wrote:Hi Chaps , I am just about to start sorting my 750 fastback
I'm fitting a new ignition and was thinking of trying a single tm 34 flat slide carb hoping for better performance than a vm 34 or 36 mm but less faff than refitting a new pair of amals
so my question is have any of you fine fellows had a go with this set up ? if son how did it work for you.
Best regards Chris

The TM is a much better performer than a VM , i have used several single carb configurations including a 34 and 36 VM but performance is lackluster ,i fitted a 40 TM and was amazed by the difference ,but you need a big inlet manifold and you have to cut a piece out of the gusset on the frame if using the 40,not sure about the 36 though, cheers
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Re: 750 commando and tm34 mm Mikuni

Postby comnoz » Mon Mar 20, 2017 11:52 pm

chrisshropshire wrote:Thanks Jim
Can I ask what you are running now ?


Electronic fuel injection. I will never go back to carbs with today's fuel.

Quite a few years ago I replaced a single VM34 with a TM34. It carbureted a little better down low but the top end was the same. And it would stick if I rode it in the rain or fog.

Then I went to twin TM43's. It ran great but then both carbs would stick when it got wet.

I mostly cured the sticking by glass beading the teflon from the slides and recoating them with MDSO2 piston coat, but it wore off pretty quickly. Chrome slides would be the thing to use in them if they are available. Jim
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Re: 750 commando and tm34 mm Mikuni

Postby pommie john » Tue Mar 21, 2017 1:18 am

1up3down wrote:
but less faff than refitting a new pair of amals


what fall off, assuming that is what faff means?

source for this information, thanks




"Faffing about" is English slang for "messing about" "doing unnecessary work" that sort of thing.
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Re: 750 commando and tm34 mm Mikuni

Postby dennisgb » Tue Mar 21, 2017 5:38 am

My 75 850 MKIII came with a Mikuni VM 34. I changed it to a TM 34.

The TM "seems" to idle smoother. It responds to throttle faster. It took a bit to get it tuned (jetted) correctly. With a single carb performance is compromised to begin with so not important to me if there was a difference.
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Re: 750 commando and tm34 mm Mikuni

Postby cjandme » Tue Mar 21, 2017 9:44 am

pommie john wrote:
1up3down wrote:
but less faff than refitting a new pair of amals


what fall off, assuming that is what faff means?

source for this information, thanks




"Faffing about" is English slang for "messing about" "doing unnecessary work" that sort of thing.

I'm not trying to derail this thread topic but I had to laugh to myself when I read the above explanation. Being born and raised in Houston, Texas to immigrant English parents, it made me think that while I speak English, I really don't speak English... because I had no idea what faff was and thought it was a "typo". I'm currently on a contract job in Iraq and the British 4rifles were just replaced by the Highlanders here at the base where I'm working----I can't understand those guys at all. :?
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Re: 750 commando and tm34 mm Mikuni

Postby chrisshropshire » Tue Mar 21, 2017 11:32 am

1up3down wrote:
but less faff than refitting a new pair of amals


what fall off, assuming that is what faff means?

source for this information, thanks

no mate faff means messing about

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Re: 750 commando and tm34 mm Mikuni

Postby chrisshropshire » Tue Mar 21, 2017 11:37 am

"Faffing about" is English slang for "messing about" "doing unnecessary work" that sort of thing.[/quote]
I'm not trying to derail this thread topic but I had to laugh to myself when I read the above explanation. Being born and raised in Houston, Texas to immigrant English parents, it made me think that while I speak English, I really don't speak English... because I had no idea what faff was and thought it was a "typo". I'm currently on a contract job in Iraq and the British 4rifles were just replaced by the Highlanders here at the base where I'm working----I can't understand those guys at all. :?[/quote]

ha ha well don't worry you well get them in the end ,it may also be the speed that they talk .
I have had similar problems in the deep south of the usa

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