Is this considered 4 stroking?

[JZ05220r]

I putt around very low rpm throttle barely cracked and get a few small hiccups and all clear as soon as I give it alittle bit more gas. This is the only time this happens on my e series 200/the only hiccup you could ever feel while riding it… I could be going up a slight incline, the throttle barely cracked and feel 1-3 tiny hiccups, roll on very slowly and all clear well before 1/4 throttle. It’s more apparent on pavement. I think this may be normal, something people refer to as 4 stroking. Anyone know what I mean? I wouldn’t feel safe going any leaner on jets than how I have the carb set currently. The only time the bike ever misses a beat is as described.

[JZ05220r]

Here’s another interesting thing I found after riding the bike in these cooler temps recently. It’s been in the 40s and I noticed the engine feels noticeably cooler to the touch after a ride. I can touch the expansion pipe in the twisty section where it comes out of the exhaust port. I can actually hold my hand there. I can also hold my hand on the cylinder after a ride. I couldn’t do this before the temps dropped. I also saw some spooge starting to droop out the silencer for the first time after taking the bike out these past few cold rides. Weird because it definitely feels to be running leaner yet I don’t believe the oil in the mixture is being burnt as efficiently now that the temps are cooler.

[bufftester]

Cold air is denser and so you run leaner (more O2 to fuel) and can compensate by using the Air Screw. Probably accounts for the hiccup when you first accelerate.

[JZ05220r]

Cold air is denser and so you run leaner (more O2 to fuel) and can compensate by using the Air Screw. Probably accounts for the hiccup when you first accelerate.

I agree. It is noticeable in 1st gear at very low loads. Didn’t really notice it a few hours ago on the engine except when riding on pavement. It feels rich, why it’s becoming more apparent in colder weather is beyond me.

[kdxdazz]

4 stroking refers to the sound a 2 stroke exhaust makes when it is running way too rich,typically at 1/16 to 1/4 throttle, it will have a distinct burble which kind of half resembles a 4 stroke sound, any kind of bogging will mean the air fuel ratio has gone past the point of the engine being able to operate normally

[JZ05220r]

I only have a few more rides before I store the bike for the winter. I’d bet it’s most likely just a minor jetting issue. If not I’m going to start by pulling the pipe off to look through the exhaust flange and check to make sure none of the subvalves are hung open. I know the KIPS design is prone to shearing teeth. Assuming the kips is in good shape, I wonder why I suddenly began to experience these low end low load misses.