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Help...My 850 won't start!

 
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obiwaynekenobi



Joined: 25 Sep 2007
Posts: 4
Location: Silverdale, WA

PostPosted: Wed Jul 02, 2008 4:04 pm    Post subject: Help...My 850 won't start! Reply with quote

Hello gang, I have a 1969 Interstate with a rebuilt 1974 850 engine installed.
I have been tinkering around with it during the winter and it won't start. It already was temperamental starting anyway. I decide to put a SPARX 220 watt alternator on it to run the halogen and flashers at night. It also has a Eagle coil and it had a Boyer power box but I replace with SPARX 3 phase rectifier with the new alternator. It also has a 36 mm Mikuni. I drained the sump which had about a pint after 1 month sitting. I have been trying to gauge the amount of spark and believe I have weak spark...when I kick it with the plug against the fins it shows a slight white spark both sides? The battery is charged and reads 12.44 volts. I also tried a little starting fluid and got some backfires but no start. Tried choke on and off. Any Ideas or recommendations?
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arch



Joined: 22 Jul 2004
Posts: 31

PostPosted: Wed Jul 02, 2008 4:42 pm    Post subject: Reply with quote

Are you running points or electronic ignition?

Have you checked the compression?

How about timing?
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Ron L



Joined: 27 Feb 2004
Posts: 1098
Location: Ohio

PostPosted: Wed Jul 02, 2008 6:29 pm    Post subject: Reply with quote

Are the plugs wet or dry? If they are dry, are you sure it is getting fuel? Since the bike sat for a while, the floats could be gummed up and not allowing enough fuel in the bowl. Since the bike tried to start on ether, I would look at the fuel delivery. For good measure I would also replace the plugs with new ones, so if they are fuel fouled it will take that out of the equation.

I have had similar issues with my own Mikuni's when the bike sits for several weeks or more. I'd take the carb apart and thoroughly clean it, paying particular attention to the rods the floats ride on and the float needle and seat.

I try to make sure to drain the float bowls if the bike will sit for any length of time.
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obiwaynekenobi



Joined: 25 Sep 2007
Posts: 4
Location: Silverdale, WA

PostPosted: Sun Jul 06, 2008 1:51 pm    Post subject: Reply with quote

Thanks Ron and Arch, sorry it took so long to reply...Ive been at work and just returned. Arch, I have points and I have tested the compression and its good. Can you tell me the best way to test the timing with the bike not running? Ron, I think you may be on the right track and I will clean my carburetor up. Can you tell me if I need a new float bowl gasket or can I reuse my gaskets? Thanks again guys and I'll keep you posted on my results.

Wayne
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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.