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Spark plug fouling and extremely rough running.

 
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PostPosted: Fri Jun 18, 2004 3:18 pm    Post subject: Spark plug fouling and extremely rough running. Reply with quote

Hey, I have a 1972 Fastback that has been sitting for almost 5-6 years Crying or Very sad . I got her running and ever since she started running she has fouled every plug I have put in it, and the engine will not rev over about 3-4 grand, the more throttle you give it just sputters. By the way the plugs were always soaked in gas and pitch black after I ran them. I have a big feeling it is way on the rich side, but I don't know how to adjust the carbs. the carbs are the stock amal carbs. I would just like advice on how to tune the carbs, if they are the problem. THANKS Very Happy



ANY HELP IS APPRECIATED Very Happy
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norbsa48503



Joined: 07 Apr 2004
Posts: 1034
Location: Flint, Michigan

PostPosted: Fri Jun 18, 2004 4:05 pm    Post subject: Reply with quote

5 or 6 years and it just woun't run aeh. Go to the phone order rebuild kits with brass viton tiped float neddeles. Before they come go to the auto parts store and score a can of carb cleaner. Pull the float bowls and the air filters and the air screws at a minimum. Take the little red tube that comes with the can and stick it in the hole were the air screw was. and blow. Watch were this comes out and the flow rate cause you need a pair of carbs they need to match. When you see it flowing well out the hole near the back of the throat, block it with your finger and make sure it's flowing out the tiny hole in the throat of the carb. Now replace the o-rings on all four adjusting screws there tight but don't use a tool that will cut them as you put them on. When your at the parts store get a small tin of o-ring grease too. The air screws are easy 1 1/2 turns off the seat to start. Now the slide adjustment screws need to go back were you found them so count the turns out and or take carful note of the size of the opening at the engine side of the slide so you can get back in the ballpark.Clean , clean and than clean again reassemble always thinking about a matched pair on all parts and adjustments. If you find little solid white nylon float neddles that was your problem most likley. Check float hieghts to speck sheets. If you really need it to run well you need to buy new neddles and neddle jets most likley. These are the highest wearing idem in any carb. norbsa
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debby



Joined: 15 Apr 2004
Posts: 898
Location: Boulder, CO

PostPosted: Fri Jun 18, 2004 6:02 pm    Post subject: Reply with quote

Sounds just like how my bike acted when the float stuck. To fix, follow norbsa's instructions above. He's got it covered. I think that will get you going!

Debby
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Ed
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PostPosted: Sat Jun 19, 2004 7:46 am    Post subject: fouled plugs Reply with quote

You might want to make sure you are not using the choke backwards. Cable pulled tight is CHOKE OFF. Cable relaxed is CHOKE ON. Make sure air filter is clean. Once running, shut off choke and hold throttle to warm.
Ed Ostack
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Sway
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PostPosted: Sat Jun 19, 2004 9:54 am    Post subject: sooty plugs Reply with quote

Norton motorcycles carbon up and must be manually cleaned. This process
is called de-cokeing or decarbonising and involves diassembly and cleaning of the top of the pistons, cylinder head and valves.
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PostPosted: Sat Jun 19, 2004 2:43 pm    Post subject: Reply with quote

Thanks a whole bunch, I will clean the carb and rebuild everything, but first I am just going to clean the carbs and tune them a little bit. If that doesn't work I will rebuild it with new parts. Very Happy THANK YOU for the very fast response time also. GREAT FORUMS HERE Very Happy Very Happy Very Happy
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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.