I am new to the CF Moto world. We just bought a 2016 CF Moto Z force 500. When we bought it it ran and drove just fine and now once we get it home after sitting at the shop for about three weeks if doesn't want to run at all. You have to press the throttle just to get it running and once it does start up it just dies and just doesn't want to run.  When it's running it smells like it's running rich. We have put a brand new plug in it and checked the fuel to make sure it wasn't bad... this just baffles me... any suggestions would be appreciated. It only has 1200 miles on it.

[2015 Z Force 800 53/Trail EPS]

If it just sat for three weeks without being on a tender, there could be a power issue. Low voltage can make them run like that and yes, still have enough to crank it over. Also, common for many is the main fuse holder...not the fuse itself. That's the one in the back compartment under the driver's seat. Bad internal crimps make for bad connections without blowing the fuse. Ok...what else. Take the gas cap loose and try it. The tank check valves tend to dry out and stick shut sometimes. Also test the fuel pressure and volume. The filter or pump may have an issue. Another thing...and I just ran into this one myself, is the dash switches are NOT water proof. Just resistant so they can get water into them and corrode the contacts...I an alluding to the kill switch as it kills or allows power to several systems. Other things can also do it...one is low compression or leaky valves. Might check the valve lash and take a compression reading. Hopefully for that 1200 miles she had a good Unifilter on it and not the stock paper filters. Otherwise that's about the life expectancy for one using the OE filter.

We tested compression and it tests around 150-180 psi. Checked fuel pressure and that is about 45 psi... check spark and it's sparking but plug smells like gas... will not even start anymore when fiddling with the gas. Not sure where to go with this...

You have everything to make it run. Did you check the air filter and the fuel filter?

Not a lot of info to go by here. I always check the simple things first. Compression and fuel pressure looks good.

Did you put your own fuel in it? (Diagnostic test) Does it run better with a squirt of starter fluid?

Your description fits well with water in the fuel (Open throttle, smells rich from incomplete burn, won't stay running) but certainly isn't the only possible explanation.

Any ECU codes?

What does "after sitting at the shop for about three weeks" mean? Did you test drive it, and then pick it up three weeks later and it didn't run right? Did you buy it at a dealer? If so, bring it back and let them fix it.

Upon opening up our 2016 CF Moto Zforce 500 We found the issue we were having with why it won't start... Also why we were having a slapping sound when it was running... Anyone else ever run into this problem? It only has 1300 miles.

Also does anyone know if these are interference motors?

[2015 Z Force 800 53/Trail EPS]

Upon opening up our 2016 CF Moto Zforce 500 We found the issue we were having with why it won't start... Also why we were having a slapping sound when it was running... Anyone else ever run into this problem? It only has 1300 miles.

Also does anyone know if these are interference motors?

I think I just saw your post on FB. I do believe these are interference motors but I thing when the cam and valve springs put pressure on that rocker, that unsupported end should raise up and not open the valves..keeping them away from the piston. In time the other side will egg-out and then the valves may not open at all. Just a guess. Roll it over by hand and see what it does.

Did I miss something? What was causing the problems?🤓

[2015 Z Force 800 53/Trail EPS]

Did I miss something? What was causing the problems?🤓

It's either poor quality materials, bad castings ..or both or it stopped lubricating and it seized splitting the case out. This may be a link:  https://www.facebook.com/photo.php?fbid=10156882102013403&set=pcb.2478025119126555&type=3&ifg=1&__tn__=HH-R&eid=ARCxRtQsJU_PgdjL49vYWsC67jO1PGYSplYoktx0LNRN5DyUSDZcSjYH2xptmW8_qP7NQJVCjVNrmwJ3

Wow that's not good. I guess the seller didn't know this because it was running when he bought it. This sucks. Can leave a bad taste for a new owner.

[2015 Z Force 800 53/Trail EPS]

I also see this sometimes when one jumps time and the piston hits the valves putting extream pressure on the rocker and pin. There have been more timing chain-related issues with these then casting problems.