[LateNA]

I have noticed this with my Grom since new. Sometimes as I am accelerating wide open, around 36 MPH I will feel one quick jerk. Kind of like a hesitation and then a short surge. Anyone else have that? Anyone know any possible causes? Chain is tightened within spec, does not feel like it is chain related, more engine related.

 

[banks619]

Haven't noticed anything here.

 

[Phillip Jordan]

I have noticed this with my Grom since new. Sometimes as I am accelerating wide open, around 36 MPH I will feel one quick jerk. Kind of like a hesitation and then a short surge. Anyone else have that? Anyone know any possible causes? Chain is tightened within spec, does not feel like it is chain related, more engine related.

Nope sorry

 

[MiniMotoMan50]

I have noticed from day one, I thought it was the clutch slipping so I pulled it apart to look. it happens only in 3rd gear at roughly 6k rpm at roughly 3/4 throttle. that's the best description I can give. its an ecu/fi issue. I haven't spent any time to troubleshoot. likely a timing map issue, maybe tps adjustment. I'm not to concerned so I'll figure it out once I get tired if the glitch.

 

[LateNA]

That is what I was thinking as well. Glad to know I am not the only one.

 

[peteyturbo]

I did notice this as well. Felt almost like chain skipping but doubt that was the case.

Sent from my SCH-I545 using HondaGrom.net mobile app

 

[Highsider989]

I have noticed this with my Grom since new. Sometimes as I am accelerating wide open, around 36 MPH I will feel one quick jerk. Kind of like a hesitation and then a short surge. Anyone else have that? Anyone know any possible causes? Chain is tightened within spec, does not feel like it is chain related, more engine related.

What gear and RPM? Sounds like you are hitting the rev limiter in second.

 

[LateNA]

Negative. Third gear and no where near red line. I would agree with Mini Moto, probably around 6K rpm. EDIT: Going to work today for the first time I noticed it doing the same thing in 4th gear around 50 MPH. I checked the tach and I was around 6,500 rpm. This indicates that it is engine speed related versus land speed related.

 

[loaded]

I had this happen once and was in heavy traffic so didn't take notice of what gear or RPM. I can say it was no where near the revlimiter. It was quite alarming. It felt electrical like spark delivery. Bike has +800mi now without one hiccup.
At what mileage did your glitches show up?

 

[LateNA]

I couldn't honestly tell you what mileage it showed up, if I remember correctly it was since new. I just wanted to make sure I was not the only one. Bringing it in for service is unlikely to get much resolution since it is an intermittent problem, so I will just deal with it.

 

[CartunzX1]

My glitch started to happen around 400 - 500 miles. It is very intermittent and my grom checks out ok.

 

[Highsider989]

Negative. Third gear and no where near red line. I would agree with Mini Moto, probably around 6K rpm. EDIT: Going to work today for the first time I noticed it doing the same thing in 4th gear around 50 MPH. I checked the tach and I was around 6,500 rpm. This indicates that it is engine speed related versus land speed related.

Check your connectors. Check continuity of the coil. How does this happen often? Every day?

 

[LateNA]

Maybe a couple times a week. The other day it happened a couple times that day. I am just going to ride it and if it breaks bring it in under warranty.

 

[jmzd4]

I havent had this problem, however it sometimes does not want to go into third from second.

I get a very nice crisp click from 1st to 2nd and from 3rd to 4th, but I have to slam it into 3rd from 2nd. It only happens when I go up in gears not when I go down.

 

[LateNA]

I have trouble at times going from first to neutral when stopped. Then sometimes I shift into second and it will accelerate for a bit and then pop out.

 

[El Chorizo]

I've had it happen but I notice it every once in a while in other circumstances too. Almost like the FI has a momentary hiccup.

 

[LateNA]

Exactly what I was thinking. I just wanted to make sure I wasn't the only one. Sounds like a widespread issue.

 

[The_Outrider]

This may be the point where the EFI transitions from closed-loop to open-loop operation. A hiccup at this rpm, especially if it didn't occur when the bike was new, makes me suspect a transient lean spot.

 

[MiniMotoMan50]

Mines done it from day one and I can almost get it to repeat on demand. I figure a fuel controller will fix it when one comes out. Ill try to pull the o2 sensor wire and see if it throse an FI light. If not then Ill ride it and see if it stops the hiccup. If so then its a mapping issue. It feels like its a map switching issue. Eventually someone will figure it out. Im not overly worried its just a little annoying.

 

[HRCNICK11]

Maybe fuel tank not venting properly. Other than that connectors.