Carb rebuild

[ALB80-850]

Greetings all,

Doing another carb rebuild, have the dip, have the o-rings from Bob Barr, also have a couple of question.

1. What exactly is lightly seated? To me, it's just snug or when the pilot stops turning easily w/o crushing the o-ring.

2. I'm not sure the jets are stock. The carbs have been gone through before(I think) the jets look new, the one # I rember is 112. This is on a 81 850 GL. If they are not stock what is stock or what effect will these jets make?

3. Can you dip the choke plunger? I've removed the o-ring and rubber retainer, there is still a rubber or nylon bushing on the bottom. I have ued a almost worn out pice of scotchbrite to polish them lightly to remove the oxidation, good or bad?

Thanks,

Andy

 

[Nessism]

Lightly seated is when the screw won't turn with finger tight torque. No worry with dipping the choke plungers. To check the jetting, there is a carb sticky at the top of this forum. Look for your exact model, or check the service manual, all the carb specs are in there.

Good luck,

 

[nisom512]

http://www.thegsresources.com/_forum/showthread.php?t=73723
your numbers and specs are in here. good luck

 

[Steve]

1. What exactly is lightly seated? To me, it's just snug or when the pilot stops turning easily w/o crushing the o-ring.

As Nessism mentioned, "lightly seated" is just finger tight. If the screw moves rather easily, just use the shaft of the driver to turn the screw, not the handle. Or you can oil the handle so you apply too much torque. Just use whatever necessary to not jam the tip of the jet into the hole.

2. I'm not sure the jets are stock. The carbs have been gone through before(I think) the jets look new, the one # I rember is 112. This is on a 81 850 GL. If they are not stock what is stock or what effect will these jets make?

Stock main jets on an 850 are 115. If you have 112 (that would actually be 112.5), the bike would run a bit lean. Since they are already a bit lean due to EPA regulations, it would really not run very well unless other modification have been done to compensate.

3. Can you dip the choke plunger? I've removed the o-ring and rubber retainer, there is still a rubber or nylon bushing on the bottom. I have ued a almost worn out pice of scotchbrite to polish them lightly to remove the oxidation, good or bad?

I have never dipped the enrichener ("choke") plunger because I was not sure about the seal on the end. I just clean them up like you did with some worn-out Scotchbrite or polish them up on the buffing wheel. There is nothing like the personal satisfaction that you have some well-hidden ultra-shiny jets inside your carbs.


Before you order your new 115 main jets, check the pilot jets to make sure you have the correct pilot jets, too. They should be 40. Of course, these jet numbers assume that the bike is stock as far as air filter and exhaust pipes are concerned.

Other things you need to be sure to do include setting the floats at 22.4 mm (+/- 1.0 mm), being sure to measure from the correct location (the bottom of the step) and synchronize the carbs when the bike is warm.

.

 

[ALB80-850]

Thanks for the replys. 2 questions:

1. under the main jet there is a washer. On the 1st set I did, it was brass. On this set, its rubber. Is this normal? Or did the PO take a short-cut?

2. On the #2 carb the PO broke the tip off of the air screw and the little broken end is stuck in the hole. Any suggestions as to how to get it out? My thoughts were really hot water to expand the housing and air to blow it out.

I knew I should have double checked my "rebuilt" carbs, but at face value, they were rebuilt. Again the moral.. no short-cuts.

Thanks,

Andy