2010 M8 wont start. Please help checked everything!!!

[-unSound]

Hey guys, my first post but long time lurker.

So heres the story: Rode all day in golden, sled ran perfectly, started fine blah blah. Then the next morning it was dead. Even after searching I cant figure out what is wrong with it.

Things Ive checked so far:

1. Strong spark (should rule out any electrical like TSS right?) and new plugs

2. fuel pump works good

3. Injectors are squirting fuel

4. Pressure sensing tube from the ecu isnt blocked


It just rolled over 1000 miles and is stock apart from a can. The fuel in it should be fine, its 91 and my buddies sled ran no problem on it. Some times it fires but just once, like theres no fuel or something. Any input would be appreciated because I really don't want to take it into a dealer...I wanna ride!!!

 

[Polarblu]

If you have fuel and a spark, either you don't have enough compression to make it go boom or spark is happening at the wrong time. Sheared key way on flywheel? Pour raw fuel in cylinders and pull the rope see what happens, tea spoon is enough.

 

[800snopro]

Do a compression test, reeds might be missing/ chipped pedals causing low compression. Many treads on here about it, common issue.


Sent from my iPhone using Tapatalk

 

[bj_lucky]

Mines been doing that too some days. After it's been parked on a down hill for a while it seems like. I don't know if its not drawing fuel or something. I've had to pull the plugs and pour a couple cap fulls of fuel in the cylinder and get it to fire a few seconds at a time. Then eventually it will get going. Happens once every other trip or so.

 

[-unSound]

So I just did a compression test, pto side had 130 and the other side had 145? Numbers seem high enough but would that be enough of a difference to stop it from running at all? Top end time?

 

[medler]

Can't see a top end needed at 1000 miles

Does it start with a little bit of throttle?


Sent from my iPhone using

 

[-unSound]

Nope, doesnt seem to matter what amount of throttle I give it.

 

[medler]

Might be as easy as a chaffed wire in the steering post maybe. Kill switch or something


Sent from my iPhone using

 

[-unSound]

I thought about that but it has a good spark coming to every wire. I took a look at the reeds while i had the bore cam, and from what i could see from my ****ty angle they seemed chip free too. Thanks for all the ideas so far, hopefully somebody gets something i missed!!

 

[medler]

Hope it gets figured for you


Sent from my iPhone using

 

[sc800]

Have you tried holding the throttle to the bar and then pulling the rope, let off the gas quick! My M8 use to do this and I would just do this and it actually states it in the manual I believe.

 

[bj_lucky]

Another thing that has worked for me is to turn the ignition/kill switch off and hold the throttle wide open. Then pull over 30 times or so. Then turn ignition/kill switch on and pull rope as normal. If still nothing apply throttle while pulling over.

Another option is pull a plug on each cylinder and pull rope lots.

That should rule out any type of flooding going on in the cylinder.

What temps were u riding in? Did you have any type of gas line antifreeze in?

 

[joekikass]

Try unclipping the wires to your key ignition

 

[mountinman]

I know this is an old thread. My M8 has had starting issue's like this since I got it. Seems like weak electrical now, not getting enough juice to the injectors. Once it starts it's OK, but if it's sat, you can pull it over hundreds of times and it won't fire, open throttle or not. I just squirt some gas in the intake (CPC Stage 2 turbo on it) and it'll fire up. Something else it does, if I shut it off with the kill switch or tether, sometimes it won't want to start, have to pull bunch of times, try throttle open, closed, then finally it'll go. Very frustrating. I'm trying a known good CCU to swap out and see if that helps