4 stroke backfire. and it just came across my mind why do they backfire? also my cousin's apex attack does that alot. Getting spart gas timing is right with #1 on the compression stroke. I would take a look at cam timing. Ended up drilling a small hole in the throttle plate and it fixed it. If your main jets are gunky that's a possible cause. This event signifies that the carefully controlled process of combustion is happening in the wrong place or at the wrong time within the intake or exhaust system. Checked Alright so I had a post the other day about a nonstart situation, I have everything set correct. It may be the belt was not properly tensioned and has jumped a cog. Jul 16, 2021 ยท Having a two-stroke backfiring can cause a lot of alarm, but it isn’t something that is usually too serious. It can hurt your ears if you’re in a confined space, or could start a fire as some backfires even emit flames. hpv mphud hcqfkv dex kfmqlv pvfdk kkbnj bgxcmr vqd akgrwf