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First start after rebuilding with no tickle, only choke

Classic Norton Commando Motorcycles.

Re: First start after rebuilding with no tickle, only choke

Postby concours » Mon Mar 20, 2017 3:30 am

Mikuni enrichener circuit relies on a CLOSED throttle to draw fuel through. Any opening of the throttle will nullify/reduce the enrichener.
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Re: First start after rebuilding with no tickle, only choke

Postby phliper » Mon Mar 20, 2017 5:34 am

kerinorton wrote:My 750 starts with a small amount of throttle when kicking over.

My 850 will only start if I give it no throttle while kicking, then a wee bit after it has fired. I have read on this forum that is is quite common for this to happen.


What model commando does this fellow have???

Dereck



Hi dereck, I have a 74 roadster commando, running on a single Mikani carb. I will try tonight.

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Re: First start after rebuilding with no tickle, only choke

Postby auldblue » Mon Mar 20, 2017 5:42 am

concours wrote:Mikuni enrichener circuit relies on a CLOSED throttle to draw fuel through. Any opening of the throttle will nullify/reduce the enrichener.


In my experience with the Mikuni on initial start up after rebuild as the carb was off another commando it involved a bit a bit of "fettling" but it's working well now and as concours says closed throttle on start up and your away. Best of good fortune with the bike.

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Re: First start after rebuilding with no tickle, only choke

Postby phliper » Mon Mar 27, 2017 6:21 am

Just to keep you up to date, I finally remove my carburator and it was stuck in 3 years of gaz evaporated! LOLL

I am going to the bike shop to get some carb cleaner.

I will keep up the news.

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Re: First start after rebuilding with no tickle, only choke

Postby concours » Mon Mar 27, 2017 6:59 am

phliper wrote:Just to keep you up to date, I finally remove my carburator and it was stuck in 3 years of gaz evaporated! LOLL

I am going to the bike shop to get some carb cleaner.

I will keep up the news.


Carb cleaner may not be enough. Be prepared to poke a fine wire through EVERY passage, then verify flow with aerosol spray.
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Re: First start after rebuilding with no tickle, only choke

Postby phliper » Mon Mar 27, 2017 7:26 am

concours wrote:
phliper wrote:Just to keep you up to date, I finally remove my carburator and it was stuck in 3 years of gaz evaporated! LOLL

I am going to the bike shop to get some carb cleaner.

I will keep up the news.


Carb cleaner may not be enough. Be prepared to poke a fine wire through EVERY passage, then verify flow with aerosol spray.


That's what my mecanics told me! ;) I will do it too :)

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Re: First start after rebuilding with no tickle, only choke

Postby Johnnymac » Mon Mar 27, 2017 11:49 am

phliper wrote:Just to keep you up to date, I finally remove my carburator and it was stuck in 3 years of gaz evaporated! LOLL

I am going to the bike shop to get some carb cleaner.

I will keep up the news.


I have a brand new VM that I put on my Atlas. I even drained the floats before I put it away for winter only to have it still be gummed up from the horrible USA gasoline.
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Re: First start after rebuilding with no tickle, only choke

Postby phliper » Mon Mar 27, 2017 11:53 am

Johnnymac wrote:I have a brand new VM that I put on my Atlas. I even drained the floats before I put it away for winter only to have it still be gummed up from the horrible USA gasoline.


Here in Canada, the gaz isn't better. There is even a case where gaz stations were putting water in it, or replace the premium with 87 octane!

Do you have any advise on how to clean my carb? It's a single Mikuni VM34. i used an engine degreaser, but it's too strong for my aluminium carb.

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Re: First start after rebuilding with no tickle, only choke

Postby jaydee75 » Mon Mar 27, 2017 1:46 pm

A soak in cleaner may not do it. You need to manually clean the jets and passageways and blow carb cleaner through everything last.
Use a stiff plastic or soft copper wire for jets. Don't scratch them with steel wire.
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Re: First start after rebuilding with no tickle, only choke

Postby Fast Eddie » Mon Mar 27, 2017 1:57 pm

I think the common culprit on VMs is the pilot jet, which, if I recall correctly, is quite buried in the carb body and really needs removing to ensure its property cleaned out.
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