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Post by tomthomson on Apr 21, 2012 19:32:17 GMT -5
I think the pilot jet on the left carb of my 83 650 is plugged. Dead miss at idle, in and out off idle and runs strong from there on. The bike sat for years before I bought it. I would rather not remove the carb so is it possible to drop the float bowl and poke a fine piece of wire up through it? If so, How fine? btw what carbs does an 83 have? The're Mikuni's, but I can't see any model no.
tommyt
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Post by Tom Graham on Apr 21, 2012 22:29:50 GMT -5
You have BS34. Do you have the metal plug off teh idle mixture screw? If so the screw can be removed and carb cleaner sprayed inside. If you are lucky, the dirt or varnish plugging the idle jet will be blasted back to the float bowl. Let teh cleaner work a bit and blast again. This doesn't work as well for very hard varnish plugs.
The idle jet is in the body of the BS34 so you almost have to turn the carb over to work on it. A little E guitar string is a nice thin wire for jet poking. Wet the jet with carb cleaner. Poke through only once, don't hog it out and damage the jet. Spray carb cleaner through to melt any varnish left in the hole.
Tom
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Post by 5twins on Apr 22, 2012 9:43:18 GMT -5
If the bike sat for years, the carbs are no doubt all gummed up inside. They need to come off and apart for a proper cleaning. If you manage to clear the jet using Tom's method, it will only be a temporary fix. They will plug up again in short order.
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Post by Tom Graham on Apr 23, 2012 10:05:59 GMT -5
Maybe the idle jet will plug with a super clean carb. They can even plug with new carbs! It has to do with how much solid dirt is in teh fuel system from the tank on down. Varnish, on the other hand, can be melted with strong carb cleaner. The very last carb I did was a VM36. The bike had been setting for three or four years. I was lucky and sprayed out the varnish plug in the idle jet through the mixture screw. The drain plug to teh float bowl was removed so I sprayed into the bowl and into the carb throat and the vent holes in the mouth of the carb. It worked and has been working for 1000 miles. That VM36 has never been off the bike. Usually when the idle jet plugs there is only one way to get is clean and that is the poke a thin wire through it but I got lucky.
Something stopped these old bikes, a dead battery, a change in life, maybe disinterest. The plugged idle jets stop so many bikes from ever running again. The bike sat for X years and most of the engine is ready to go once the carbs and fuel system are cleaned and a new battery installed. The front brake hydraulics are suspect too because no one flushes brakes but that's another topic.
Now my XS650 had been setting for around 20 years. The inside of the carbs were not only varnished but also corroded. The carbs needed dissassembled to scour out the corrosion. It was so bad the bottom of the floats leaked and had to be rebuilt. So it depends on the condition of the carbs. Sometimes all they need is the varnish melted away. Sometimes they need thrown away. It's up to the owner/mechanic to make an assessment how much of a shortcut they can get away with.
Tom
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