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carb starting problem

  • Thread starter Thread starter s watson
  • Start date Start date
Thanks for the explanation and link on the mechanics.

chuck hahn said:
There ARE springs on both the pilot and mixture screws. He should have regular VM26 carbs.
Click to expand...
I couldn't find springs for any of my pilot (bottom) screws. I see them in the GS850 carb rebuild writeup but I assumed the GS750 carbs were different. Are all Suzuki VM26's identical?

I guess it's time for me to locate some new springs.
 
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A VM26 is a VM26....What condition are the tips of the pilot needles?? Nice sharp points? if they are flat or jagged better look down the holes with a light to see there arent tips broke off in there. Shine the light into the back of the carbs throats while looking down the pilot screw holes..you should see a pin point of light in the hole.
 
As Chuck said, the springs are there, just not externally visible. That's assuming you took them out to see and no PO screwed them up in the past.
 
Note the side mixture screw springs are a different size thann the bottom pilot screws. You have the side screw springs???
 
I used my little LED keychain light to peer down into the pilot (fuel) screw hole. Thought I saw a spring so I tried Chuck's paper clip trick. After having no luck, I concluded I was looking at the screw threads. I obviously didn't want to damage them so I stopped scraping and dipped the carbs without getting the springs out. Not a single spring came out, either when disassembling or after dipping. I guess the PO took them out.

The pilot needles were in great shape (very sharp point and not cracked or broken). I was very pleased to get them back in and seated, then backed out without breaking anything. The side mixture screws have springs on them. Those are only springs I found when taking the carbs apart (besides the choke plunger). I'll try shining a light into the carb throat and looking for light in the pilot hole but I'm convinced these carbs are missing the springs on the pilot screws.
 
You for sure need springs on the pilot screws..the tension applied by them keeps them from vibrating out when the engines running. Glad to hear the tips hadnt been snapped off..thats a good thing.

If the spring where in there they wouldnt be very far down so you probably were seeing the threads.
 
Use the carb cleaner and spray it into each of the passages. You should see fluid emerge from every location that the passage goes to.
 
Yes i quickly learned there are a bunch of little passages and the carb cleaner would come out of unexpected places. I've tried to follow the passages shown in diagrams but get overwhelmed. I'll give it another shot.

I originally thought I could get by without the springs, but it makes sense needing springs to keep the screw from backing out. The pilot screw isn't listed on the parts diagrams so I don't know what size I'm chasing. Might just bring a carb and screw to the store to find a spring that fits. Thanks for the help.
 
Will do. I like Z1. Jeff and Steve have both been a tremendous help over the past few weeks.

A pic down the pilot hole of carb 1. The first edge you see is the start of the threads. The next edge (in focus) seems to be the end of the threads. No spring??
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And if you shine a light at the hole in the throat of the carb you should see light there..indicating no broke off tips. And if a tip is broke off you will see the tiny spec of brass in the very bottom too.
 
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