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Discussion Starter · #1 ·
I posted a similar version of this in the engines section, 40 views and no response. I think I pissed folks off because I have a rhino. I am not able to ride a grizzly four wheeler due to a SEVERE lumbar problem, imagine having a 52 degree curve there . Don't want sympathy just really need some help guys.
I have a rhino. I needed a head for my 660 and new ones are very pricey so I found a used one off a Grizzly that worked fine. The help I need is finding out what the two bolt holes in the rear of the head, just below the cap and above the exhaust ports are for. I didn't notice them before I installed it. You can barely view them with a small mirror. I think they are 12 mm and also think exhaust blows out of them with the two exhaust tubes bolted up. When I got the engine finished and turned it over and was checking for exhaust leak and I put my fingers by the holes and am pretty sure exhaust puffed out, am not able to check further as I had to leave home right then and won't be back for 4 weeks. I've looked at head diagrams, rebuild and tear down videos and don't see anything on it. The bad thing is I promised my wife I would have it finished so she could use it while I am gone but told her to leave it parked as I don't want her to get carbon monoxide poisoning. Or would it be OK for her to drive it? Our 21 month old grandson greets us with the words "a ride" and now she is hearing him say it off and on all day as she is his babysitter at least 6 days a week. He LOVES it and LIVES to ride in it. Any help would be very very much appreciated. In the pic it looks like they just have a cap on them, mine has bolt holes. Help Please. If I don't get help this time I won't waste anymore of you folks time on this site. Thanks In Advance Guys
 

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Grizzled Moderator
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I posted a similar version of this in the engines section, 40 views and no response. I think I pissed folks off because I have a rhino.
The regular members on here are not type to avoid your threads because you have a Rhino, there are plenty of members with OHV machines on here other than a Grizzly. Besides, your question is about a Grizzly 660 head anyway. The majority of active members own Grizzly 700s (686cc/708cc) and I suspect you didn't get a response yet because the right person hasn't seen either of your threads yet. Unfortunately you may need to be a bit more patient to get a response.

BTW, welcome to GC!
 

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We don't care what you ride. Your thread probably just got lost in the list. It happens

I am having a hard time understanding exactly what holes your talking about though. All of them take bolts of various lengths.
 

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I saw the other question. Didn't answer because it's not an area I have expertise or even an educated guess about.
When you don't get an answer, or several answers in a day or so, just post again in that same thread with the word "bump". That brings it to the top of the list again and nobody will fault you for doing that once a day or so until you get an answer. Especially on a weekend when the people who have the answer might be out for a ride.
 

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Discussion Starter · #6 ·
Many Thanks To All

I tried to drag and drop the diagram but can't.
One of the bolt holes is just above the (#6 stud on ATV parts diagram) RH stud on the LH exhaust port.
The left one is pretty much straight above the left exhaust port.
It looks like a type of plug in the picture I posted below.
I may be looking at the wrong head because mine definitely has bolt holes, but the guy had the head listed as 07 Grizzly. My Rhino has nothing to bolt up there.
I'm very sure they are 12 mm fine thread.
I thank you guys very much.
A little more on my Grand grandson! The Rhino is parked on my carport. We walk through there 99.9 percent of the time we go in and out of the house. Every time we carry him past it he says "truck" and/or "a ride"and we have a wrestling match as he tries to get down to get to it. "A ride" are actually the first two word sentence he used. He is certainly going to be a lover of 4 wheeler's and side by sides and very likely going be be a member of this forum in a few years!
I am sure eventually one of you will figure out what I need to know so thanks again, I will be patient and try to do the bump thing. I have to admit I'm a nuts and bolts guy and am technologically impaired!
 

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Hey...Rhino2017..Welcome to GC from Wisconsin...I ride a Kodi now no one cares!

Is this the head your are referring to? All the bolt holes on the top are to install the valve cover.

 
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Discussion Starter · #8 ·
BOLT HOLES

Well I spent at least 30 minutes answering sometime after midnight. Most of that time was trying to drag and drop a picture I had marked with red the spots I am asking about. I clicked "POST QUICK REPLY" and now I see it's not posted. So I shall try again,
Thanks To All
 

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Well I Do Declare!

It did post you just have to click on it.
I need to apologize, I am sorry guys, after doing some reading I see I have made some mistakes. I posted in this section for anything except Grizzlys.
Also I think I'm not supposed to be posting in my own thread, but I don't know another way to communicate with the ones that replied. So if thats the case I am sorry!!
You guys have been very helpful and I appreciate it.
Best Regards

Thread moved to Engine and Transmission forum by okbear.
 

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Your pic with the red spots came through. All pics I can find online show those bosses being plugged. What does your old cylinder look like?

And you're fine here, post in this thread as you need.

@nflow, care to help this guy out?
 
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Hey... no secrets... we all want to know the answer to the mystery.
 

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First off you said that the engine runs, but seems to pass gas through the wholes. (whew) Try pluging them with short bolts and brass washers. If that stops the leak, and all else is still good go for it.
 
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Do as Desrat suggests, a bit of sealant won't hurt either, now down to why their there, the atv head down thru the years(via partzilla) doesn't show those lugs being used in any way, but it could have something to do with an overseas model somewhere, or the engine may be in something like a snowmobile??? (for example), or some bright bunny drilled & tapped the holes for some reason & drilled into the exhaust port, if the threads come all the way to the top of the lug then someones been at it, factory holes generally have threads start a bit further down to help align the bolt so you don't cross thread it eg. the engine case thread holes are tapped flush but use the outer cover holes as a clearance hole for alignment of the bolt.
Well, that's my theory anyway :smile2:
 
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Discussion Starter · #18 ·
kdt1970, You hit the nail on the head, that's what I have and I am sure the bolt holes are "factory".
I'm going to put a little high temp gasket silicone in the hole threads and fill the 12 mm x 25 mm bolt threads, add a sealing washer and snug them up. I will definitely report the results on here fellows.
MANY thanks all of you again.
 

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Do not fill those holes with silicone. Just use sealing crush washers on the bolts.
 
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