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Sonders

new to me 01' Kodiak 400

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Hey guys.  New guy here with my first Yamaha quad.  Traded for an 01' Kodiak 400 that needs some tlc.  It was running but idle is off, missing some hardware here and there, none of the lights work on instrument panel and front brakes didn't work were the main things that jumped out at me.  I drug it home and have started tearing into it.  Started with fresh oil change and flushed the dirty brown coolant and replaced with fresh coolant.  The carburetor is missing the side cover for the throttle cable and I don't see where I can buy just that cover without buying a complete carb, so went ahead and ordered a new one (hasn't arrived yet).  the Starter relay solenoid was crap and had to mess with it to get it to start half the time so replaced it.  I have a few questions as I'm going through this quad that I'll list below.

 

1. It has a cut plug on wiring harness under the instrument panel.  Can anyone tell me what this plug goes to?  There currently is not a plug running to the 4wd indicator light on instrument cluster so I'm wondering if 2 of the wires are for that possibly??

 

2.  Also in the front, there is a air duct under the rack and black plastic panel that runs down to the engine case.  Is there supposed to be some sort of cover or anything over it?  I looked online at parts diagrams and couldn't even find this duct or the duct that runs up by taillight in any of the diagrams.

 

3. this fuel line on top left side of carburetor; is this what goes to the gas tank cap or is it just a vent line for carb?  Follow up question, where does the line that comes off of the gas tank cap go to?

 

I'm sure I'll have many more questions as I work through this thing.  Thanks in advance for any replies.

 

wire plug.jpg

front duct.jpg

carb top.jpg

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did some digging and found out the harness that was cut is actually the dash indicator lights for temperature and 4wd.  Got new plug ordered so should take care of 2 questions I was asking about.  Previous owner had the light plug for the speedometer plugged into the temp indicator.  I couldn't find the cover I was needing for the side of the carburetor so had to order new carb.  Looking through service manual it looks like the gas vent line I was asking about on the side of carb is in fact just a vent tube.  Still wondering about the air duct that comes up in the front between radiator and handlebars; but I can't seem to find any details about it in service manual or parts diagrams.  Been plugging away at this thing, stripping it down and cleaning it up.  About time to start putting it back together and get it on the road.

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Nice work so far.  That vent line coming off the carb is just that, a vent line.  It usually wraps right up by the gas tank under the plastics.  There should be another one coming off the bottom of the carburetor bowl and that one is routed down the frame to the bottom of the bike. 

The vent hose on the gas cap is usually stuck in a hole on the dash board and does not connect to anything other then the cap.  

The air duct your referring to is probably an aftermarket snorkel that should have extended up in front of the handle bars.   It’s for riding in deep water that allows air to continually flow into the air box.  That’s my guess anyway.  Post some pics and we will let you know for sure. 

That plug your adding back to the dash I see you figured out, nice work.  Hopefully the new plug will wires right up and your good to go.  

Do you have the wire diagram for that bike ?

 

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hey Frank, thanks for the reply.  Yes, I located wiring diagram online; that's how I figured out what the plug that is cut is for.  The air duct is the round pipe that is in 2nd picture I posted above.  it runs down to the transmission case.  There is also one that runs from just under the taillight and into the backside of the transmission case as well.  Looks to me like the one in front should have some sort of screen over it or something.  Attached is how the bike currently sits.  I'm waiting on a few parts to arrive before I start putting it back together.  You can kind of see the rear air duct tube that runs behind the taillight down to the backside of transmission case.

kodiak stripped down.jpg

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I also need to figure out how to adjust the rear brake.  I'm wondering if I can just bleed it like I did the fronts as the foot pedal is close to bottomed out currently.  I'm a little confused though as I found the service manual for it on this site and as I looked through it, it shows it having a rear drum brake.  Mine however has rear disc brake. 

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Could have been a conversation kit added or a change over year where the manufacturer added disc brakes.   But yes the premise is the same with regard to bleeding.  

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That's what I was thinking Frank.  Going to give bleeding the rear a try sometime this week.  It was missing the engine guard/skid plate when I got it.   A new oem one was about $60.  I found a few used ones on ebay for $15 but are for 03' and up models and are a full 1 piece plate.  I went ahead and got one and am going to try cutting it down to just the middle piece that I need.  Or remove the front plate that is still on mine and see if I can get the full 1 piece plate to mount up on it.  We'll see what happens when it arrives later this week.

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What the heck might as well do a little custom work.  That’s one of the best things about working on these older bikes.  You can modify, customize etc and not worry if it gets screwed up.

 eBay has a ton of stuff which is great. Now the wait starts for shipping!!! Hate that part! 

Good luck with the work.  

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got bottom engine guard cut down to fit and installed this weekend.  About ready to fire this thing back up.  I do have a question.  Speedometer doesn't work so I ordered a new speedo cable.  Does anybody know the correct process of disconnecting it from the engine housing and installing the new one?  I see there are a few gears in the speedo housing and I don't want to risk tearing anything up.

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have this thing mostly back together and had it running this weekend.  I ran it up and down the driveway a few times and noticed it's cutting out which leads me to believe the carb will need to be adjusted.  I just need to figure out correct way to do that.  All the issues I had from original post have been taken care of, except for speedometer cable.  I had one on order at local dealer but it is backordered.  Looks like that fix will be waiting awhile.  It was having issue with going into Low and High range when I first got it as well, but that ended up being because the idle was too high.  I've got it idled down lower and it shifts into gear no problem.  I also need to get a fuel gauge for the tank sometime and install as it's missing and just has a homemade plug where the gauge goes.  I thought I got a good deal on this thing with the issues it had, but boy are the parts receipts adding up.......

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Considering the work you’ve done and the money you spent where are you currently at? 

Adjusting the carburetor is not hard at all. But make sure you are able to get to the air fuel mixture  screw first and that it can be adjusted with the air box on and covered. All you should have to do is set the idle high enough so the bike stays running during this process.  

Then while the engine is running you turn the air/fuel screw in either direction.  One way or the other the engine will start to rev higher. That’s the right direction.  Keep turning the screw until the rev reaches its maximum and starts to decline. Stop there and go back a hair.  Lower the idle to a good setting and you should be good to go.   

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on top of what I originally paid for it, if I have all my receipts all added up I'm currently at $1,600.  So not terrible,  It will need a few more items eventually, but once I get the carb adjusted correctly I'm going to run it as is for awhile.  I'll have to take a closer look, when I get home, but do you know where exactly the air fuel mixture screw is on the carb on these quads? 

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Not too bad. I would say if you’ve kept it under $1800 your fine.  

That screw is located on the bottom of the carburetor in a very difficult spot. Some of the time they are covered by a brass plug that has to be drilled out.   Your going to have to get a small/short screwdriver to get up in there to make adjustments.   

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Located fuel/air mixture screw on carb last night, but not sure how the heck I'm going to get to it to adjust.  I had a pocket screwdriver, but still couldn't get to it well enough to turn the screw any.  Going to have to regroup and try again tonight if I can find a shorter screwdriver.

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If your able to, what I do is find an old cheap screwdriver and cut the shaft from the flat tip down about an inch. Then reconnect them with a tight fitting piece of rubber hose. This makes the screwdriver flexible and can make a nice turn.  If not they sell a small right angle flat tip screwdriver. 

I-MART 3 Pcs Offset Screwdriver Set Right Angle Phillips Screw Driver/Flat Head https://www.amazon.com/dp/B07HDJGV92/ref=cm_sw_r_cp_api_i_ahOeDbAQAZV07

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ok, had some time to mess with this last night but didn't have much luck.   Warning, long read to follow:

 I found a small right angle screwdriver in tool kit I keep in my car to use on fuel/air mix screw on carb.  I felt around for the screw to get the screwdriver on it but couldn't find the head of it.  I got frustrated and ended up removing the carb to get a better look.  The screw is a weird one, or it has cap over it like you mentioned earlier in the thread Frank.  Keep in mind this is a new aftermarket carb (pic of what I was seeing below).  I didn't know what to do with that, so I robbed a few parts off of the new carb and put on the oem carb and stuck the oem carb on the quad.  Once oem carb was installed I tried firing it up and it just cranked but wouldn't fire.  After a few tries the starter stayed engaged and kept cranking over so I had to disconnect the battery.  This was a new problem I've not encountered before.  I installed the original starter relay solenoid to see if that made a difference and it did as the starter only cycled when I hit the starter button like it was supposed to (weird).  I tried starting a few more times and still no luck getting it to fire.  Next I checked for spark by removing spark plug and touching it to the cylinder head and boy did it have plenty of spark as it shocked the crap out of me.  I removed the oem carb and swapped the few parts back to new aftermarket carb and installed it back on the quad and wouldn't you know it, it fired right up and idled as smooth as can be.  I rode it up and down the driveway a few times to see how it ran and still same issue with it cutting out as I got on the throttle.  So basically back to square one where I started.  Any thoughts on what I'm looking at on the aftermarket carb air/fuel mixture?  Also attached is a pic of the quad put back together minus the tank and engine side covers.

fuel air mixture.jpg

Kodiak almost assembled.jpg

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I laughed my ass off on the spark testing process.  Well at least spark is good! 

So that small brass plug with the two small button holes in it. That’s a tamper proof cap. You can buy the right tip at any hardware store or make one up by grinding the middle of a screw driver out to look like a two prong screw driver that fits with adjusting as your grinding.  Or a small very pointed needle nose pliers.  Unscrew that and the air/fuel screw should be underneath it.  If you unscrew it all the way and it has the needle attached then it’s the actual air fuel screw itself.   That would suck because it’s going to be a bitch to adjust while the bike is running but your going to have to modify that angle screwdriver with a grinder to fit the holes and go that route. 

The air/fuel screw should be set right around 2-1/4 turns out from a snug tight position.  So try that first and run the bike and see how it goes.  

Also double check the float level. While the carburetor is off the bike take the bowl/float cover off. Hook a clean hose up to the fuel connection on the carburetor. Hold the carburetor straight as if it were on the engine and blow into the hose. Air should come out of the bottom of the carb where the float pin is.  As your blowing air raise the float up and see how far up the float goes before the air stops.  It should be about 3/4 way up.  If it’s closing sooner then it needs to be adjusted. 

See how that works out and get back.  

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Yeah I checked what the oem carb was set on and it was 2 -1/4 turns.  I wonder if I can get a replacement fuel/air mixture screw needle that has the turn screw sticking out bottom that is easier to adjust.  Busy the next few evening, so will be the weekend before I get a chance to mess with it anymore.  Man I just want to get this darn thing on the road.  I also started to disassemble the oem carb lastnight to check it over but 2 of the damn screws on bowl had stripped heads so couldn't get them off.  Was just an overall frustrating evening; I finally had to just call it a night.

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