Question about Motorcycles
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Posted on Jan 02, 2017
Go to the dealer and ask for the stock plugs for your bike. Check for spark on each of the new plugs then install the plugs.
Remove the carbs , dissemble it and clean the varnish out. Remove the petcock, ( gas valve ),water trap and clean it out. Next let one cup of gas flow into a container. Any water or rust in the bottom of the container? If any rust was in the water trap or the container then purchase an inline fuel filter to eliminate the rust getting into the carb.
If cleaning the carbs yourself does not do the trick then take it to the dealer and have them clean it and install carb kits. This should eliminate the carbs as a problem. Get a new air filter and install it.
Now you have spark, gas and air. If it still will not start it is likely that you need new crank seals. On a bike that old you may well need new crank bearings as well.
Please rate this solution. Thanks!
Posted on Mar 22, 2009
SOURCE: 1973 Honda CB450 carb problems
Turn the air screw and throttle screw all the way inward until they LIGHTLY seat. Now open each of them one and one half turns. That is the factory setting. Chances are the carbs are gummed up with varnish from evaporated gas. Disassemble the carbs and soak them in denatured alcohol for 30 minutes. Now clean them with spray carb cleaner from the auto parts store. You need to be sure all the jets and fuel circuits are clear. You may need a service manual sometime. Here is a website that looks like it may have a free download. Even if they want $20 or so, a service manual is handy to have around. http://www.mediafire.com/?jnyzijmfydw
Posted on Feb 02, 2010
I have the H model and set mine at one and a half turns out from stop. It waivers a little from summer to winter but only by a fraction.
As for the idle speed, when bike is warmed it will idle a little different to when cold and using choke.
Personal preference really, without a tacho fitted, I set it so she idles easy when cold. Once she's warm, idling is generally not used!!
To balance the two, warm engine and hold throttle at your optimum idle speed. Screw in idle adjuster until it engages base edge of carby slide. Release throttle and screw in/out fractionally to test if revs rise/fall. Set at optimum and then turn air mixture screw in/out till revs are highest (without using throttle). Then reset Idle screw back out to bring revs down to optimum level.
Tip, use a little thread seal on the idle screw as they have a nasty habit of unscrewing and leaving a hole in the side of your carby...sure fire way to lean right out and burn a hole in your piston when riding.
Posted on May 24, 2010
SOURCE: Carburetor settings for a 1978
Slightly grey area as mixture, air screw is normaly addjusted when the machine is hot and is screwed either in or out whichever makes it run the best, however a base setting is 2 to 2 1/2 turns out, from all the way in. That would be 5 half turns
Posted on Aug 26, 2011
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