Yes ,and welcome,10/40 is about the middle of oil viscosity for ATVs, mostly oil numbers are related to hot or cold seasons cold weather you want thinner hot you want thicker but not to thick never go thicker than specs ,some newer bikes take 10/30 ,10/40,even I've seen 10/50 just remember the first number is when the machine starts as it runs the second number is the thickness of oil on internals. Hope this gives you a little insite. Have fun and get greasy.
Had a John deer,that went to the paces like you have got compression up to par then wouldn't turn over fast enough to crank. Choked starter was working but week,put new starter on and fired right up. Hope you get it going
