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BST36SS carb expert needed.

  • Thread starter Thread starter yoshisakan
  • Start date Start date
Turns out my pilot circuit was way lean, I installed some 40s and got it to idle, although it was still lean, so I have 45s on the way. Cylinder 4 still won't heat up like the others. It's cool to touch while the others are burning hot. It's not the coils, wire or spark plug. You'd think that would leave fuel, but the choke circuit is working. I'll look at the carbs again while installing the 45s to try and figure it out.
 
The choke is fed through a very small brass tube that goes into a well in the float bowl. If you remove the enrichment plunger on the carb body and shoot some carb cleaner through the hole at the end using the thin straw on the carb cleaner spray bottle you should see a solid stream of cleaner coming out through that brass tube. If not then the enrichment circuit is plugged. You should also be able to spray down into that well in the float bowl and see a stream of cleaner coming out the hole at the bottom. You will need to pull the carbs to do this.
 
I boiled these carb bodies and went through 2 cans of carb cleaner, id be very surprised if that brass tube was clogged, but i will give this a shot when I replace the pilots.
 
If you didn't dip them then the boiling alone would not have done it. You also need to probe the bottom of the float bowl well and the brass tube with a very fine wire. I've seen several of the float bowls clogged completely but look clean.
 
Copy that - Is there a "DIP" method for the casual carb builder? Are you referring to those gallon buckets of "carb dip" sometimes found at the auto parts store?
 
So I went up to 45s, it will idle perfectly now and if I flutter the throttle to 1/8 or 1/4 open it revs fine, if I go to 1/2 or more it hesitates then revs and slowly revs back down when I snap it closed. Needle clip? I'm on 2 down, thinking of going to 3 down.
 
Cylinder 1 is still behaving strangely. It's not heating up like the other pipes. I think maybe I need to step up to 50s, when I opened the adjusting screws to 5 turns the mid range lean lessened. I'm using those long boy fuel screws so either they're slightly different than stock or the pilots are still undersized. I don't think the needle would make it act lean after shutting the throttle .
 
The problem here is cylinder 1. I can pull the wire and there's no idle change, if I pull cylinder 4, the bike dies every time. The carbs are spotless, all the pilot circuit holes I can see through. Carbs are bench synced. Put about 80psi of air in the cylinder, valves are all sealing, no oil blow by from worn piston rings. Ive switched coils and cylinder 1 and 4 wires. Electric grounds are all good. What on earth could be the problem here?
 
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