Check your air-fuel mixture,buy a new NGK plug,gap it to spec, clean your air filter. Can you take a small piece of sandpaper and clean the magneto contacts. clean gas tank and fuel petcock and get a in-line fuel filter to stop all the schmegma from going to the carb.Hold your reeds up to the sky if you can see daylight where the reeds come together at the end of the cage the reeds are bad.Is your motor sucking any air such as loose head bolts exhaust flanges are your reed bolts tight is the carb bolted to the engine tight.Last but not least make sure your spark plug boot is tight on the plug.

 

blasters are a non contact ignition system, they don't have a magneto, they have a primary ignition coil that is magnetically triggered, there are no contact points to clean as the electrical charge is built up magnetically through a coil winding, not by breaker points, the charge is then sent to a capcitor discharge ignition unit or CDI, there the signal is converted to voltage and sent to the secondary ignition coil where it is amplified to the spark plug and used to fire the spark, if either coil becomes weak, the spark is affected and may not have enough power to ignite the mixture completely, which could cause the engine to seriously backfire, you'll know if the CDI box goes bad as it will just not spark at all when the capacitor loses its charge.

I would do a resistance check to specs in your service manual with a multimeter, the things booger pointed out are basics to check but not likely the cause of your problem.

 

my bad, right, the stock is 230. im running a 250

 

thanks pete for setting me straight I do have some knowledge about bikes,but didn't vknow that about blasters as i am going to buy 2 baskets and 1 blown so i can stick a 85 in it as we speak thanks for the heads up,Dave

 

hey no prob, booger, every little bit of info helps when your trying to get your machine running