XH Motorcycles Forum

Motorcycle Resource Forums => Technical Resource Discussion => Topic started by: brixtonanimal on May 06, 2019, 08:34:54 AM

Title: [solved] Aggressive Misfire under Acceleration
Post by: brixtonanimal on May 06, 2019, 08:34:54 AM

I've finally gotten the bike out of storage and ridden for the second time this season, my first ride was flawless, rode about 25 uneventful miles on the highway. I started the bike up yesterday and it rode as normal for about 5 minutes. Then as I was getting onto the freeway it started to horribly misfire and shut off. I was able to limp it back, having to restart it about 20 times, but I made it home alright.

I assumed it was the gas (still from last season), so I drained it and replaced it with some new fuel. After that it continued to misfire horribly but didn't shut off.

Does this sound like a case of old gas or am i likely looking at a larger issue here? 

Title: Re: Aggressive Misfire under Acceleration
Post by: rt66john on May 06, 2019, 02:42:25 PM

Does the engine light come on?  Have you been able to read any error codes stored in the ECU?

I had something similar happen to me a couple of years ago.  In my case, it was a bad coil for the front cylinder.

Title: Re: Aggressive Misfire under Acceleration
Post by: wytfut on May 06, 2019, 03:56:07 PM

Also sounds like a loose battery cable.
Start with simple stuff first...
Our battery cables are notorious for coming loose.
On 2 of our Xs I ended up soldering the bolts so they wouldn't come loose

Title: Re: Aggressive Misfire under Acceleration
Post by: brixtonanimal on May 06, 2019, 08:15:34 PM

Thanks guys, it was definitely the loose battery cable. Thanks so much for the pointers. I was frantically looking at all the stuff that could be wrong online instead of actually looking at the bike. Seriously thanks again.

Title: Re: [solved] Aggressive Misfire under Acceleration
Post by: wytfut on May 06, 2019, 09:15:13 PM

The OEM battery cables just don't mix with the engine vibration frequencies.
Jamie/Marty found some battery cable that has no problems with the vibes..
They work very well

Title: Re: [solved] Aggressive Misfire under Acceleration
Post by: blackheart on May 09, 2019, 07:41:59 PM

Roger that Bruce.   I fought broken/loose cables before and the ultra flexible cables are necessary on these vibrating machines.