I bought a Baja Reaction 150 used. ran great for a week of hard riding. then started sputtering/popping when I gave it gas, gets worse when engine warms up, but idled and stared fine. I read problems with petcock. so I cleaned it out and blew out vent lines/vacuum lines. there was a lot of junk in petcock. presto ran like it was fuel injected very nice. After some hours of riding problem started back up. I pulled petcock and cleaned again, this time no improvement. Used a standard o ring from hardware store in petcock. so i cleaned carb, it was new. guy i got cart from replaced old carb with new one. but i didn't have o-ring for electric enricher. I got o ring at store and it would barely fit in. put little grease on ring and got it to go in. carts not running good now. starts out ok, but still with the sputtering/popping when I gave it gas, gets worse when engine warms up.. I think its electric enricher, or petcock or coil? I do my own work on toys but getting frustrated and considering taking it to main street cycles. but I can really afford shop rates.. Please help me get my favorite toy back in action again.