One thing i seen working in a shop is people having problems running the 10w40. all the other hondas were fine running it. In the rincons we ran the honda 5w30 and that seem to fix the shifting problems.

 

The book also lists 5W30, so I don't think 10W30 would hurt anything to try. A synthetic might be worth a shot, as long as it is rated MA and does not contain Molly or PTFE/Teflon.

One of the things I remember them saying they changed for the 680 was bigger oil passages to the transmission for better shift lockup when cold.

The oil pressure ports are 8mm x 1.5 thread. I recall a thread about someone drilling out a bolt and welding to make one, but you might also try Honda part #07AMJ-HN8A100. You could get a 0-160 psi gauge at northern tool or wherever.

If you need the pressure specs, let me know.

Jeff

 

My 07 Rincon did kinda the same thing a few summers ago in third it seemed to slip and not grab and bring me to full speed properly..I was a little freaked because of the things you read on the internet.. All I did was the next oil change i went and got some ams oil 0-40 ATV OIL I figured maybe the oil in the bike wasnt thin enough or something. Ever since that day it has shifted like a DREAM even with little warm up time or none. Only problem I faced after that was a small oil leak from the front output shaft which it didnt do with the thicker oil. I switched to the AMS OIL 10-40 motorcycle oil which is safe for wet clutches and everything has been great.

 

Yeah, synthetics have better pumpability when cold.

I generally run HP4 (without molly) in mine. Yes, I know, there are better synthetics out there- but it is available locally and I like to support my dealer.

 

If I could get the specs that would be great!! I was talking to the dealership today and they said it could also be a bad clutch pack? Could this be true with the symptoms I'm having? They said for them to do the o-rings it would be around $800-$900. They also said they wouldn't garantee that would fix the problem so this is why I would rather do it myself and save a little money. If the pressure test shows low pressure would this mean it is the o-rings for sure? Thanks for all the info and my apologies for the questions you have all answered many times i'm sure.

 

ahh ha!

I just posted this question a few minutes ago:
"Anyone else notice a "whirling" sound and sluggish shifting on your cold honda?
I changed the oil to a high quality 5w 30 synthetic- didn't know if that would cause the whirling. Seems to go away slightly 15 - 20 minutes into running. It reminds me of the sound my outlandr's cvt made- but there's no cvt on the honda..."

I think you answered my question.

 

What kind of quad is it with the whirring sound?

Anyway, for the Rincon, pressure should be 114 psi at the galley plug on the right side of the valve body at 5000 rpm.

Under the left side cover and mud guard are the 3 ports for the various gears. You will need to have the ATV secured with the rear wheels off the ground. Measure pressure at each clutch port in ESP 1, 2 and 3 at 5,000 rpm.

Also, I recall reading about a few people who had gunk build up in the valve body. It wouldn't be too tough to take it off and clean it. The front cover and replacement of that oil seal doesn't look too bad, either, though I've never taken the front cover off of a Rincon myself.

 

05 rincon 650-
from what I've been reading, this seems kinda normal. I will check the pressure though.
Around here (mass) in january & february, it's not uncommon to have temps dip into the negatives during the morning & evening hours- so I run 5w 30 in most motors. But this is the first time I've used synthetic oil in an atv so...

 

Mine has never made any kind of whir noise, but then I rarely ride it in really cold temps.

Make sure the synthetic is rated MA and does not contain Molly or PTFE/Teflon.

Sometimes the quads equipped with a centrifugal clutch will make a whir sound when shutting down or in engine compression braking situations- when the sprag clutch in the center of the hub goes bad, but the Rincon doesn't have that kind of system.

 

Cannot express how important it is for the SYNTH OIL being used to be wet clutch compatible.. If it has friction modifiers in it not only will it make your tranny slip but also burn it up!!!!