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What caps do i remove??

chuck hahn

chuck hahn

Forum LongTimer
Past Site Supporter
I know this is a GS` forum and I beg the memberships indulgenece in allowing me to ask the following without coming under too much fire. A buddy of mine sold his Harley a few years ago so he could adopt a little boy and pay some bills. The 83 honda i have listed under my bikes is gonna be his if we can fix these carbs. Now the meat of the situation.. Its an 83 Honda Cb 650 SC nighthawk. 1) What kind of carbs are these 2) what is this i hear about having to remove a cap off the fuel jets so they can be taken out and cleaned? Is this the small flat "CAP" that is directly on the other side of the carb body from the pilot screws? All i know about what i can find is that they are Keihn carbs, the clymer manual says that the intitial pilot screw setting is 2 5/8 out from bottom...
 
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Thanks for the link..looks likw what i have been needing. Will have lots to do tonight..LOL
 
I think number 5 in the first schematic posted above is the fuel screw. it will be in the under side of the carbs on the engine side of the carbs and when the carbs are installed on the engine these screws point strait up. some carbs (for emission reasons) have anti tampering block off caps pressed into the body of the carbs to eliminate access to these screws. yours may or may not have these caps. if they do you can take a drill and carefully drill a small hole in this flat sheet metal plug or cap using care not to "plunge through" into the screw upon penetrating the cap. once you have a hole in the cap you can usually use the tip of a small punch or some small rod to pry the cap out. also a twisted easy out will usually work to spin the cap out. once the caps are out , count the turns it takes to lightly seat these screws and once you clean these ports return the screws to the factory setting. also , I have found these screws to be maybe a 1/4 turn different from each other.
 
well guys.. good news..bad news. The carb project was success and i rode it tonight and out 46 miles on it out on the freeway. It ran strong and pulled like mad. Now for the bad. It seems i have no charging system. I know the Nighthawk site stated that this bike doesnt charge ubtil it reaches around 2000 RPMs.. I would think that going nearly 50 miles at highway spees this should have kept the battery up. It stalled at a light about 1/2 mile from home and i had to push it the rest of the way. The battery is new last week, so i can only surmise its the charging..any opinions????
 
chuck hahn said:
... any opinions????
Click to expand...
Pretty much like we tell all the others, with their GS bikes.

Measure the resistance from each stator leg to ground.
Measure the voltage output of the stator.
Check the diodes in the r/r.
Check the voltage output of the r/r.
Check ALL the connections between the stator and the r/r and the battery.
Make sure the r/r is properly grounded.

You can probably use The Stator Papers as a guide, but some of the actual values might be a bit different. The principle remains the same, though, high resistance from stator legs to ground, low resistance from any stator leg to another, bunches of AC volts out the stator, about 14 volts out the regulator.

.
 
A lot of people use Honda regulators on their Suzuki's SO refer to the Stator pages Systems VEY simillar
 
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