Dropping a cylinder.

[BeezrGeezr]

While riding a while ago, I noticed a stumble on starting to move or other loading at low RPMs. Actually stalled a few times trying to get going on an uphill start. I checked the forums and found it sounded like the fuel pump symptoms from the recall. I installed a new pump (Full pump assy, plug&play). I also serviced the air filter with a new element and cleaning of the entire intake system. I fired it up in the shop and it ran fine. Today I went to go out and it fired right up and then dropped a cylinder, then it came back, revved up, then slowed almost to stall then idled normally, then back to one cylinder, and so on. All without touching the pedal.
Has anyone else had something like this happen? Maybe a computer problem? Reboot? Coil problem?
Any help is welcome.
Thanks. Phil.

 

[Admin]

 

[CMB]

Check ALL of the grounds for good contact and tight connections. More info on the buggy would help also, model year, ever been under water or deep mud ?

 

[CID]

The Pioneers were breaking a wire inside the insulation, right at the injector if I remember correctly. I wonder if the Talons are going to have that problem too? How many miles?

 

[BeezrGeezr]

150 hours on a 2019 Talon 1000X. Never flooded or mudded. It spends most of the time in a closed garage. Some snow riding.

 

[HondaTech]

Spark Plug

 

[SLOWPOKE693]

Spark Plug

Or sparkplug wire. They tend to pop up and off the plug enough to cause misfires.

Hess has a solution to that problem.....

Spark Plug Cap Stay- Honda Talon

We have seen the spark plug caps pop off while racing. We have seen this happen while hitting jumps and whoops on short course tracks. This can cause misfiring and or losing a cylinder all together. We developed a simple fix to prevent this from happening. Made of Aluminum Lightweight/...

www.hess-motorsports.com

 

[HondaTech]

Or sparkplug wire. They tend to pop up and off the plug enough to cause misfires.

Hess has a solution to that problem.....

Spark Plug Cap Stay- Honda Talon

We have seen the spark plug caps pop off while racing. We have seen this happen while hitting jumps and whoops on short course tracks. This can cause misfiring and or losing a cylinder all together. We developed a simple fix to prevent this from happening. Made of Aluminum Lightweight/...

www.hess-motorsports.com

View attachment 345207

Can't say this have ever been a problem at any point in our race cars career. 🤷🏻‍♂️

 

[SLOWPOKE693]

Can't say this have ever been a problem at any point in our race cars career. 🤷🏻‍♂️

After the next race push down on the plug wires and see if they go click. Some don't pop off enough to cause a problem and some do. Mine didn't pop out enough to cause a misfire but they were always "up" after a race. My buddy had similar issues and his caused a random misfire.

 

[HondaTech]

After the next race push down on the plug wires and see if they go click. Some don't pop off enough to cause a problem and some do. Mine didn't pop out enough to cause a misfire but they were always "up" after a race. My buddy had similar issues and his caused a random misfire.

Hell most of the time i can't get the boots out of the head when doing a service on customer units.

 

[BeezrGeezr]

Spark Plug

Thank you, thank you, thank you! At 75 years old, I think I may be a bit too old for this s***. After all, I totally forgot the 'Golden Rule' of dirt bikes and all my British junk...If it quits, change the spark plug FIRST!
Two new plugs and it runs like a top again. Pricey little buggers, though!

 

[SLOWPOKE693]

Two new plugs and it runs like a top again. Pricey little buggers, though!

You can buy the plugs from Rock Auto for dirt cheap by using the # on the plug and not the Honda part #.

 

[highpocket74]

You can buy the plugs from Rock Auto for dirt cheap by using the # on the plug and not the Honda part #.

I have to remember this! Plugs from Honda are ridiculously over priced. Do you have the plug number handy Slowpoke?

 

[PaulF]

NGK Part Number is 90992. They are around $15 at AutoZone and O'Reilly's

 

[PaulF]

Or directly from NGK for $13.32 but you have to pay shipping...

https://www.ngk.com/ngk-90992-silmar8a9s-laser-iridium-spark-plug

 

[SLOWPOKE693]

I have to remember this! Plugs from Honda are ridiculously over priced. Do you have the plug number handy Slowpoke?

Eric @ PPEI showed me that trick, I can't take credit for coming up with that one.