Replacing vented side cover with non vented side cover.

My new to me 01 XRR runs really strong & starts easy.
Its pretty much stock, Its uncorked with a header & exhaust, K&N filter & side cover vents. Per the previous owner its stock carb is jetted a tiny bit on the rich side. Am replacing the scratched up vented side cover with the stock OEM non vented cover. Does the vented cover have much effect on jetting? I wouldn't think so but wanted to ask.

Just drop in a stock jet and your sorted....

Am new to these bikes, but I would think uncorked with full exhaust has a larger effect on jetting than a few holes in the airbox cover? Not sure stock jetting as you mentioned is the ticket uncorked with a pipe.
Also, Calif. stock jetting is probably different than the rest of the world. LOL LOL
Have only had the bike a week. The prev owner said it has a 180 main jet.
Am at sea level and it seems to run really well as is. Just not sure the vent holes really effect this?

yes you will probably have to rejet. Have a search around there are charts that will give you ballpark jets for different altitudes and setups (ie opened side panels, different exhaust....).

Best way is to do runs and a plug chop - plus you will find out your bikes top speed during the full throttle run...

SkidMark

Yes the side panel does affect the fuelling , so you will need to rejet , it will run even richer so you need to go with smaller jets , two sizes down on the main jet i am guessing .

That's what I need to know.
Thanks!

Fist off, ditch that K&N filter, and do it quick too!
It's a cotton gauze type and they let fine dust through - good enough for the road, engine-ruining for offroad.
Your 180 is already too big I'd guess, 175 would be the ticket if not a 170.
Drop in a std (closed) sidepanel and you'd end up with a 165 - and yes, that's with an 'open' silencer.
Play around with a 165 & 170 and take it from there, jets are cheap enough.

Honda XR650R (Honda Tech Bulletin)

https://www.4strokes.com/tech/honda/650rmods.asp


Part Description

Competition Spark Arrestor

Carburetor Insulator

Main Jet (#175)

Jet Needle

Jet Needle Clip Position

Airbox Inlet Duct Caps
(Air intake restrictors)


Honda P/N

18317-MBN-640

16211-MBN-640

99101-357-1750

16012-MBN-641

N/A

N/A


Instructions

Replace existing spark arrestor with this part.

Replace existing carb insulator with this part.

Replace existing main jet with this part.

Replace existing jet needle with this part.

Set jet needle in center (3rd) position.

Remove caps per this diagram.

As I said, play around with a 165 & 170 and take it from there, you just might surprise yourself

I have tried the 175, 165 and 160.
Found the 165 to be very close for my environment (sea level and 30-38 degrees C). The 175 left the tail light and number plate black after a decent highway ride.