[NickTheTrick3]

Guys, don't beat me up too much, as I am probably just in denial.
2017 Honda Pioneer 500 --

It completely loses all power going up hill or under any load. and in Auto, it doesn't want to shift past 2nd gear. It struggles in manual, because it has no power. But it runs and revs just fine at idle, seemingly.
I've done a tune up, replaced the spark plug and assured it had good gas.
Fuel Pressure tested at 48-52psi. every time. Also tested while driving, and it checked out.
Then I did a compression test. It has a 9:5:1 according to the manual, so that should come out to about 139.61PSI on a compression test. I GOT 88-90psi every time, five times in a row.
I'm in disbelief almost, because it seems to run so smooth at idle. But again, maybe I'm in denial.
Am I done here? Or do you guys have any advice...

Thanks for your time,

Nick

 

[lesblank]

When you preformed compression test did you hold the throttle wide open?

 

[Mark in Northern Iowa]

If the driver seat belt is latched, and or you didn't accidently cut or damage the wires with the other things you were repairing.
Then my first best guess
- plugged air filter or plugged exhaust
if not either of those, then
- valves are adjusted to tight
.
Have a good day

 

[NickTheTrick3]

Lesblank—> I did not hold the throttle open. I’ll run the test again with open throttle.
Mark in Iowa—> I also thought that it was the exhaust, so last week, I replaced the filter and the entire exhaust (with a “gently used” one). I checked the valve clearance, and it was within spec, but I will check it again. But I never even thought about the seatbelt. Can you explain that to me? Does it have a safety feature?

 

[NickTheTrick3]

Hey I was just out there looking at it, and I don’t think this thing even has seatbelts. I don’t see a seatbelt or latch anywhere.

 

[Mark in Northern Iowa]

Pages from your 2017 owners manual
.

.
Is the speed or seatbelt indicator blinking when you ride?
With no seatbelts, the previous owner had to have bypassed the seatbelt switch.........????
.
edit to add
The seatbelt switch was/is inside the driver seatbelt latch.
The wire harness plug connector is under the seat, where your seatbelt latch should have been.
.
Have a good day

 

[Mark in Northern Iowa]

Here is how I bypassed / speed limit my Honda.
.
Have a good day

 

[mole]

At 600 miles my 700 pioneer was showing same symtoms.after much head scratching,finally figured out it was badly worn cam shaft.was told off record that quite a few pioneers had this problem.hope this helps.

 

[Mark in Northern Iowa]

That is true, for the 700's.
His is a 500 though, and I can't remember reading about any 500 with a worn cam.
Is it possible, heck yes, haha, but if it is a worn cam, it will be the first 500 I have heard about with that problem.
I'm still hoping it is only a seatbelt latch that he couldn't find.
.
Have a good day

 

[NickTheTrick3]

Update>>> Compression is good. I made a stupid mistake, that was quickly pointed out on here. I did not hold WOT when doing my test. It went to 150psi.

I've been really busy with work, so I haven't been spending as much time on it, as I should be.
However, yesterday, I did find that the O2 sensor delete had been cooked. Harness side and delete connector side are both burnt to a crisp. I ordered a new harness side repair kit, and a new O2 delete. I am hoping this fixed the issue.

Thoughts?

 

[lesblank]

If the O2 sensor wires, even if a bypass, could be sending false readings to the ecu. Hopefully you found the issue.