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Just checked compression, low on both cylinders but really low on the cylinder that had the popping issue. Looks like it's time to do another top end. Who does cylinders on 2 strokes? Shops around here won't touch them. Also, what pistons should I go with?

Sorry, I was switching the negatives. Well, after not being able to get it started with the new parts I put in all of the old stuff and am getting the same result. Getting spark just like with the new parts but will only pop out of the carbs. Checked the timing just in case and it is right at 2mm BTDC. Probably should've just left it the way it was, at least I could ride it lol

Alright, got everything hooked up and now I can't even get it to start. It will pop out of the intake or exhaust of either cylinder once every few kicks. Everything is wired how the last coils were and it will not even try to start. Took it apart several times to make sure I did it correctly and even switched the positives to the coils around to make sure I just didn't have them on the wrong cylinders. There wasn't any difference.

Switched coils yesterday and it did the same thing on the opposite cylinder. Ordered coils and an AGM battery. Hopefully after this I can start logging some miles on this thing.

I will switch the coils tonight. I suspected the battery was low as the problem occurred more when the turn signal was on. As soon as it would be turned off it would stop popping and when it was flipped on it would begin again. I charged it when I got home and it still popped. Either the coil had not cooled down yet or the 1 year old battery is bad.

Yes, I just went through the carbs to make sure everything was good there. I am running a dynatek ignition. The motor didn't do so great on a pressure test and led me to change out the crank seals. Now it holds pressure as it should.

Well guys, this one has me stumped. I recently went through my '72 R5 and did a top end, fitted JL chambers, electronic ignition and new coils. I put about 400 miles on it after the work was done without any issues (other than setting the jetting in the beginning.) About a week ago, once the bike got hot it will pop out of the carb on the right cylinder while taking off (below 3 or 4k rpm.) The longer it is ran like this the higher the rpm it will need to stay running. I almost was left stranded today because it would just pop and bog with any throttle input. The bike starts first kick and runs perfect until about 20 miles into the ride and this problem starts. Any help or guidance would be appreciated because I feel I am flying blind and going through and checking components without making any progress.