Bought a used Grizzly 80 from a dealer that appeared to be in great shape. The carb was a problem from almost day one. After removing it for cleaning I could never get it adjusted properly. It would not come back to idle quickly, but would hang up and after 20 to 30 seconds it would return to idle. I checked all the linkage and cable and confirmed that it was all working properly. Went back into the carb to make sure it was spotlessly clean, assembled properly and the slide and needle were moving freely. Same problem, so I ordered a new carb, installed it and all issues were resolved. Then my son got some really bad gas which gummed up the carb. After cleaning the carb–complete disassembly–I am having some of the same problems I had with the original carb. So, it appears to me that the problem is probably with getting the carb adjusted. The pilot screw–under the security cap– was opened about 1/2 turn originally and that’s where I reset it. I can’t seem to find the right combination to get it to run right. I’ve done a number of carbs on other bikes and never had this problem. Any ideas or suggestions will be appreciated.