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Won't Idle?

 
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jsouthard



Joined: 26 Jul 2008
Posts: 42
Location: Detroit Michigan

PostPosted: Thu Aug 21, 2008 4:35 pm    Post subject: Won't Idle? Reply with quote

Hey guys Need HELP!

I recently installed a Mikuni 34MM carb on my 850 roadster. I had her running great for the last two weeks. 950 rpm at idle. Strong kickover etc.

Yesterday she died at a light on my way to work. I rode home quick and when i got back from work it started up and seemed to idle fine.

Tonight it will start but after i remove the choke it dies immediately. If i try to keep the idle open (choke off) it starts popping aggressively and still dies.

I thought i might have clogged the main jet. I took off the bowl, removed the jet, air blasted it clean and reassembled. When i kicked it over it started on the second kick but again when i remove the choke it dies right away.

2 1/2 turns out on the air screw. Had a 950 rpm the day before. The only change was a fresh tank of gas (premium). Any ideas?

Big trip planned this weekend... AHHHHH!
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cash



Joined: 10 Nov 2006
Posts: 419
Location: west cumbria

PostPosted: Thu Aug 21, 2008 11:49 pm    Post subject: Reply with quote

If it's running normally other than tickover don't worry the cause might just be the new fuel. You guys seem to have some funny fuel. Forget the main jet or needle they don't come into play at tickover.

Try screwing the air screw in say 1/4 of a turn.

Cash
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ML



Joined: 29 Jul 2007
Posts: 44
Location: Melbourne, Australia

PostPosted: Mon Aug 25, 2008 7:12 pm    Post subject: Reply with quote

I'm getting to grips with the Mikuni VM 34 single carb on my 850. I'm rejetting this weekend on good advice from the forum (Thanks everyone).

I also had a similar suddenly good to bad running when the carb was fairly new. Choke on fine, choke off went rough and died even when warm. Turned out to be loose bolts on the manifold. I made a thicker gasket, used a light coat of Permatex and regularly check the manifold bolts are tight.

Hope this helps
Mick
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The Unapproachable Norton Commando

At the end of 1967 the Norton Commando was announced.

The Norton Commando was greeted with a certain amount of scepticism because on first sight the commando appeared to comprise of the old Norton Dominator twin cylinder engine mounted at an inclined angle in a set of new cylinder parts.

It was not realized that the new Norton Commando Isolastic method of engine suspension damped out all engine vibration and produced a machine which had uncanny smoothness for a vertical twin. In due course the critics were silenced and the Norton Commando had the distinction of being regarded as the first of todays so called superbikes. There can be little doubt that the original design concept of the Norton Commando has proved correct, since comparatively few modifications of any real consequence have been made since production commenced during 1968.

Now nearly 40 years later Norton Commando riders like us are a breed of our own, and as far as we are concerned its still more fun to go for a blat on the old Norton Commando, and fast. As a Norton Commando owner and enthusiast, my goal here is to promote and give credit to those who keep the Norton name going.

It is more deserving to give credit to the Commando itself, for after all these years it continues to be respected. The original Commando designers like John Favill are those who deserve the credit for developing this incredible motorcycle.

The Norton Commando Roadster and Interstate of the late seventies, never died. Although the Norton Villiers factory dispersed the tradition lived on. Today Kenny Dreer in the USA is developing the new 952 CC Norton. What a great looking bike this is, and its engineering is still based on the original layout. It will be interesting to see how the new 952CC Norton does in todays tough motorcycle market. One thing is for sure, I would own one if I could afford it.