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I am near the end of an engine swap on a 1990. Prior to the swap I put some sea foam in the tank, and ran the old sputtering engine as much as I could. It had 213,000 miles on the engine and had low compression. As I ran the old engine with the carbs exposed I could plainly see the accelerator pump was working. When I twisted the throttle the small tubes at the top of each carb would shoot out a small stream of gas.

When I had the carbs off the bike, I took a float bowl cover off one carb, but everything was so absolutely clean that I decided not to mess with them.

I have them re installed on the new engine and the engine fired right up- I was pretty excited about that. However, now the accelerator pump does not seem to be working. I twist the throttle and there is no shot from the tubes. The engine stumbles and can be coaxed to run faster, but there is no shot of gas.

I kept the carbs under a clean rag while they sat on the work bench for two months- can't imagine that both carbs could get plugged at the same time while sitting.

The air shot solonoids are connected with the air hoses but the electrical to them is not hooked up yet- but I think those are just to prevent deceleration back firing.
Any suggestions on where to start?
Thanks
 

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Yeah, the shot air valve is to prevent backfiring and sudden deceleration when the throttle is closed rapidly. My best guess would be to check your linkage, if the pump worked before it should now, might be something missed in the re-installation much more likely than the carbs went suddenly bad.
 

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It’s the biggest problem I have found so far! There have been a number of times when I thought I might be in over my head! I took lots of pictures during the tear down so I could refresh my memory as I put it back together.

 

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hi randy when you took off the acc pump did you refit the o ring under it if so some times it might get air locked if you give the trottle half a dozen rapid full twists it should clear
 

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Thanks for your suggestions. I tried pumping the throttle a number of times, I tried a suction tube on the outlet tube. I finally removed the carbs and took the pump apart. Every thing looked normal and clean. I check the passages and every thing seemed to be allowing fuel to go thru. I put it back on the carbs and it still did not work. I took it apart one more time, and this time when I put it together I filled the chamber with gas before I re assembled it. With gas in the chamber instead of air it was able to pump the fuel thru like it should. Got everything back on the engine and it is working just fine!
 
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