The correct spark plug gap for a 84 suzuki lt50 is 0.028 this is the factory spec.
ngk bpr4HS
buy a manual
Mine was getting 100. But i dont know how good that is. mines 90
If you have a torch try adding heat and then while it is hot try to get it off not like red hot though .
to check the age on a suzuki lt 50 quad just locate the aluminum serial number panel located under the front plastics usaully behind the suzuki weight on there you will see the serial numbers and also it will state MFD IN. this is your age location panel if it states for e.g 2/95 then this means the quad is made in febuary 1995...
50:1 is what we use in ours same mix in my outboard on the boat http://macswildboarpage.blogspot.com/ 50:1 isn't enough oil for these engines. Outboard motors run cooler since they are water cooled and may tolerate less oil. If you are using a very high line synthetic oil, then 40:1 is best, If you use a traditional 2 stroke oil (like from penzoil or made for a chain saw) use 32:1.