I could really use some help if anyone can... I recently acquired a Big Bear 350 ... mid 90's model and it was a basket case (so to speak) shifting mechanism messed up, carb shot, wiring issues etc...etc... I think I have most of it lined out but I'm stuck with something...I have driven it for several miles already and it ran OK but when I parked it it wouldn't start back... It's blowing gas back into the airbox...I take the intake off and hold my hand on the carb while cranking and fuel sprays all over my hand...I have adjusted the valves, all new carb components (jets, needle seat and valve, etc..etc..)

Now the problem seems to be fuel blowing back into airbox

Any help would be greatly appreciated...

 

get a compression gauge and perform the compression test. let's see what that comes back as. thumb test obviously returns skewed results

 

I don't have one of those but I will ask around and borrow one...Are you thinking it could be rings? Is this a common problem with rings...It may take a couple days but IU will check and get back to you...Thanks for any help...I appreciate it... Max

 

just trying to help you rule out the expensive repairs first if all is good. it may be down to just a timing issue or another valve adjustment.

 

OK ...I finally tested it...the compression was a little over 130 .... I would assume those are good numbers...I checked valves and they are within specs.... not sure what to do next...