These guys should have already done that...but yes, fuel pressure and volume test and a system's voltage test, not just at the battery. And have them do a compression test and check the valve timing as well. Doesn't mean they will understand. Looks like they are just screwing-up your machine and you are paying them to do it. You would be better off doing this yourself but you would need some tools and equipment...so I guess you are stuck. Good luck...and I mean it. They have already ripped you off so bad on this other useless other stuff.

Ok, updates on this one from the shop!

On the loss of power issue:
• They tested fuel pressure and volume = was fine.
• Check battery and system voltage = was fine.
• Compression test and valve clearance = was fine.
• Check fuel for water/bad gas = in progress/TBD.

On new rattle noise in CVT since belt/roller replacement:
• Didn't set the cam plate on the splines correctly when reassembling the primary and torqued it...or maybe not even torqued it = said they checked and even called CFMOTO and all seems installed correctly.
• Since they said the new noise may be due to new/tighter belt; they are reinstalling old belt to test and see if still make noise to test that theory = in progress/TBD.

What are you thoughts?

Problem is I don't have another shop that works on CFMOTOs for hours. And I don't currently have a truck or trailer even if I did. So I've got to figure some way to get it running again with them.

So I need to tell them to do a "fuel pressure and volume test"? And a "voltage test" (I assume you mean battery voltage)? Is that the correct terminology?

Yes, it's two of the most common things that can cause it. That's why I mentioned them. Low compression is also one but let's hope that's not it.

So I need to tell them to do a "fuel pressure and volume test"? And a "voltage test" (I assume you mean battery voltage)? Is that the correct terminology?

Hopefully you switched to the Unifilter at or near purchase. Otherwise the average engine lifespan in dusty conditions has been less then 1200 miles.

Yes, installed the 2 layered Uni filter right away. Along with the Outerwears prefilter on the actual intake between the seats.


Another complication: When I went to test drive it last week at the shop after they did the new belt and rollers, it's now making a horrible rattling sound. Like marbles in a tin can. Assume it's coming from CVT. Seems to be worst when you left off the gas and are coasting to a stop. They claimed that the new belt and rollers was causing the "misaligned drive shaft" to act up more (making contact with something, I guess??) with the added tension of the new/non-stretched out drive belt. Does that make sense to you?

Would water in the fuel or low voltage cause such a consistent power loss? Always in high gear and always at higher RPM?

[UPDATE: ISSUE RESOLVED. See this post for more info: https://cfmoto-forum.com/800ex800/power-issues-on-800-trail/msg52158/#msg52158]

Desperate for some advice here...

During my last few trips my 2021 800 Trail (625 miles and 50 hours of use on it total) has been acting weird at higher RPMs. Would not get above 4600ish RPM in high gear. Almost like a governor was on it. Low gear seemed normal. And no, it's NOT the seat belt or air filter.

Dropped it off my my local shop last month. They said valve clearance was slightly out of spec and they resolved that. $300 later = issue remains. Then they said my "rollers and CVT in drive pulley were flat spotted and needed to be replaced". + $350 later = issue remains.

Now I'm being told that the "drive shaft is misaligned" and it needs new everything CVT (drive shaft, clutch housing, clutch assembly, gaskets, etc). First time any clutch work has been done on it so no idea how this happens and they aren't able to tell me how either. All this to the tune of +$800 more. Parts are ordered but they have no clue how long it will take to get them (weeks or months they claim). And ask me how optimistic I am that will fix the issue...

Of course, none of this is going to be covered by my useless extended warranty. So ~ $2k in parts and labor later I'm quickly loosing faith my CFMOTO!!!

Does any of these make sense to you guys? Are all of those CVT/clutch parts required to be replaced just to do the drive shaft?

Does it sound like a "misaligned" (whatever that means) drive shaft could be causing this power issue? To my knowledge they haven't even hooked it up to a scanner to see if it's some engine/software/tune issue before throwing all of these parts at it.

UPDATE: ISSUE RESOLVED. See this post for more info: https://cfmoto-forum.com/800ex800/power-issues-on-800-trail/msg52158/#msg52158