My CTEC 800 developed a bog/stutter off idle to about 5400 RPM. Starts and idles fine but in that range it runs like a fouled plug or plain falls on its face if you grab the throttle quick then hits 5400 RPM and runs like normal to max rpm. The sled just rolled past 7k miles. I swapped plugs and compression is dead even at 122. Has anyone experienced a similar issue?

Next steps I think Ill try to bore scope reeds for chipped petals and then send out the injectors to be tested?

definitely check the reeds. if they need replacement, go with vforce or Boyesen while you're doing it.

No need to fuck with reeds ATM...The throttle cable is stretched...

Edited March 15, 20251 yr by SlugsOnSleds

Bringing this back around as I finally got the motivation to tear into it. Reeds were fine looked like new. Someone mentioned throttle cable but that is all in spec. I have the injectors sent out to be tested and cleaned. Any other thoughts if those come back fine? Is @krom active on this board at all?

Edited December 8, 2025Dec 8 by shimxtr1

reflashed?

seem to recall an ECU update... paging @favoritos

I'd be surprised if a reflash would fix that issue. The update they did was pretty minor.

My 18 ran pretty well until it didn't. It started doing goofy misfire symptoms around the 7k mark.

In this case, it doesn't sound like high rpms are cutting out yet. Have you tried to verify TPS is working properly?

Honestly, couldn't find anything wrong until it got dang bad. Reeds were good, compression was ok, fuel, spark, TPS checked out good, etc. On mine, it was inner crank bearings. It was a little surprising because the early compression test didn't show numbers way off.

Mine never received the reflash, it runs well as is and I can mitigate the flaming after a hard pull. I heard horror stories or runability issues after the reflash back in the day. The problem with mine ended up being a bad injector. I sent them out be tested and one was bad the other was marginal even after cleaning.

On 12/23/2025 at 2:48 PM, shimxtr1 said:

Mine never received the reflash, it runs well as is and I can mitigate the flaming after a hard pull. I heard horror stories or runability issues after the reflash back in the day. The problem with mine ended up being a bad injector. I sent them out be tested and one was bad the other was marginal even after cleaning.

Did it end up fixing the issue?

I just got the report back and will be picking up new injectors Friday...should have things back together Friday or Sat at the latest depending on how motivated I am. Based on the inspection report I expect this to be the root cause.

Injectors were the culprit.