Quantcast
Jump to content

Recommended Posts

Posted

Hello, great forum here!

 

I bought a non running 1998 Big Boss 500 6x6. The previous owners had done quite a bit of work to it. It has a new carburator, fuel pump, starter, adjusted the valves, new mid sprockets and chain. But they said it wouldn't run.

 

When I got it home I did get it to run, though not very well. It doesn't want to idle and there is a very loud knocking. I didn't run it very long. Hopefully it's just the clutch knocking. It has 4000 miles on the odometer. I popped off the valve cover and the cam looks ok, (it's not flat!) I haven't measured it yet. I still need to check compression.

 

There's no oil in the gearbox, found a crack in the case behind the output shaft. Looks like a mounting point?

 

I think I'll try and find a case half. I should probably tear apart the gear box first, it might be in bad shape inside. Who knows how long it was ran without oil. It does shift between all gears.

 

b6f0f62c0d98022ecaf1b516e4734192.jpg

 

7bf30431a5e2904bf81518ffc3a86df2.jpg

 

The rest of it is in fair condition, normal wear and tear for 4000 miles.

 

Sorry I don't have any pictures of it other than the cracks.

 

I should probably make sure the motor is good before I put money into the gearbox.

 

Any tips on things to look for would be appreciated!

 

Thank you

 

 

Posted

Wow that sucks.  But yes overall a new side case will be in order. Not a bad deal other then the labor sore of it.  New gasket kit complete kit. Might as well bc you never know what you will need going down the road.

I like to take a big piece of cardboard and stick the bolts in the cardboard and mark down where it came from with a sharpie, keeps it easy to keep track. 

Pressure wash the sh** out of everything before you tear into it so it’s somewhat clean. 

Keep us posted and take lots of pics as you go. 

Posted

I remember busting the case on a 98 Xplorer 300 when the chain broke! Seems like it was just the right side.

Hopefully all I'll need is the right side. I haven't pulled the gearbox out yet. Might have jumped the gun on buying it! But I didn't want to miss out on being able to buy it.

Posted

Compression is 75 psi, spec says 50-90 is normal. Valve clearance all measure around .006", spec I found is .0024".

Started taking the gearbox out. Looks like I'll need to pull off the primary clutch so I'll need to get a puller. Might try the water trick if I can get it tilted up far enough.

Posted

I thought it would have higher compression too. I read that the auto decompression is why they read low.

Clutch came off with no issues. The bolt out of my pitman arm puller was the right size. Used the handyman jack and picked up as high as I could without the jack slipping out, filled hole with water, ran the bolt in and the clutch popped right off! My first time using the "water trick", I'm sold!

cba3e727fa262ed527044bdca5f0d828.jpg

Gearbox come out without any issues.

a0091aba6ea3aade7cb3f1f99ad1338b.jpg

I think this sprocket was why the case broke...

20a4ba5091199e7bffa972466d84a49e.jpg

Now I need to clean everything up and work on the motor while I wait for parts.

Posted
Sweet project!

Thanks!

Makin work of that. Nice stuff, now the wait for the pets starts.  Hate that part. 
Well it looks like your doing great.  Keep us posted. 
Good luck. 


Still plenty to do on this project. Trying to get motivated to clean everything up.
Posted

Since I don't know  just how the clutch is removed , I  can  only comment  on the  water trick.  It sounds like the same trick  used in the automotive trade for removing  bushings in blind holes (  mainly  the pilot bushing in  the flywheel on cars with standard trannies) . Instead of water,  use  grease. no worry  about  it spilling out of the hole no matter what angle it is on.

Posted
Since I don't know  just how the clutch is removed , I  can  only comment  on the  water trick.  It sounds like the same trick  used in the automotive trade for removing  bushings in blind holes (  mainly  the pilot bushing in  the flywheel on cars with standard trannies) . Instead of water,  use  grease. no worry  about  it spilling out of the hole no matter what angle it is on.


Yes, this is the same trick. You can put anything in the hole that won't compress. I've read where people have even used bread.
Posted

I went through the carburator today and got her running.

Doesn't sound very healthy! I listened all over the engine with a screwdriver to my ear and couldn't pinpoint the noise.

Posted

Well, good bad news and good news.

The bad; I was idling the engine tuning the carburator, and it seized up! Couldn't budge it with the starter or recoil. Pulled the spark plug and recoil cover and was able to break the engine free using the flywheel. Loud squealing from the cylinder. Put oil in the cylinder and turned it over a dozen times. Put the recoil cover back on, and used the electric start and turned it over a bunch more.

Then I decided to drain the oil. Normal 2 quarts from the tank. Then I pulled the oil filter, it was bone dry! Pulled the crank case plug, about 4 drops came out! WTF! There's normally about a cup in the crank case.

So I'm thinking man, I guess the oil pump failed?

The good; Started looking at a drawing of the oil system and compared it to mine, and found the hoses on the oil pump were backwards! The previous owner had three oil tank off, guess they goofed up on the hoses. Swapped the hoses, started it up and the motor sounds a little better, but now there's lots of blow by because it's getting oil, lol. I'm glad I found the reason why it wasn't getting oil before I took the oil pump apart.

c70df499978c28ae42f4e726b900f22b.jpg



Ran it a bunch more, no smoke from the exhaust. Just the crankcase vent.

So I guess a minimum I'm going to need rings.

This thing is turning into more of a project than I anticipated!

Looks like I can remove the cylinder without taking the engine out.

I know, I should go through the whole engine. The plan for this is to take it to the cabin, where it might get 10 miles a year put on it. I'll risk the rest of the engine as long as there's no big peices that come out when I change the oil again.
Posted
Awesome pics brother.  Doing great, keep up the good work.   

Thanks! I had time before work and was able to get the gearbox in the frame.

8e6f2352eb74578e2c82cd01412c29f9.jpg
  • Like 1
Posted

I had to have the rear brake hose repaired since it's no longer available. Local hydraulic shop was able to reuse the metal ends and replace the rubber.

eb7b7a874054f0170240d0980e2c0030.jpg

2194bac7ce993b58e9312a27b1f35f6a.jpg

New brake pads came in too!

Slowly whittling away at it.

Posted

That great. I’ve walked into so many places and no was the answer.  Then you walk into the right guy that says yea I can splice that! 

Thats great news brother.  Little by little, keep at it.  

Keep us posted and the pics coming!! 

Posted
That great. I’ve walked into so many places and no was the answer.  Then you walk into the right guy that says yea I can splice that! 
Thats great news brother.  Little by little, keep at it.  
Keep us posted and the pics coming!! 

I've used this shop many times, they're always great to deal with. Often times it's cheaper to have them make a power steering or oil cooler hose than buy a new one, and they use arctic grade hose that I've never had fail.

This was the first time I've had them repair a brake hose.

I had them add 1 inch of hose so it wouldn't rub like the old one did.
  • Like 1

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Similar Forum Topics

    • By kawasig
      Hello All
      I'm kinda new to ATVs. I just bought a 1987 Suzuki quad runner 230 Dual Range. I'm having a problem finding info on it. It's very clean, only 2.800 miles. The front wheels are only 30 in.center to center. I was thinking about adding wheel spacers to give it more stability. I realize the added stress on ball joints and bearings. I'm wondering if there are any other concerns? Any input is greatly appreciated!
    • By Kaz
      Troubleshooting a no spark issue, was running OK, maybe a little rich, turned it off, now no spark. I've checked/ohmed out the main key switch, the start/stop switch, neutral switch, brake switch - all good. It will crank the starter, but no spark with the starter or when I try the pull start. I've checked all fuses and diodes. Swapped battery. New plug. New coil. Swapped in a used CDI - no help. Traced, removed, cleaned, reattached all grounds. Removed things like my winch from the circuits to be sure a bad relay or something was dragging it down. When testing voltages, the orange wire going from the CDI to the ignition coil shows no/very low voltage-shouldn't it have 12V on it? Sometimes I get a very weak, intermittent glow on my spark tester, but not enough to fire the plug. I've checked continuity on just about all wires in the harness. Checked/cleaned/lubed w dielectric grease- all connections, redid a few that looked old/dirty. I've checked the stator resistances, all good, but have a stator and rectifier ordered anyway, will arrive Sunday. I verified that the rectifier has a voltage output back to charge the battery while cranking - 10.5-11V, low, but expected while starter is engaged. What else can I check as part of troubleshooting? I have a Haines service manual, but the 1999 350 4x4 seems to be an odd model, there isn't an exact electrical diagram for it, but found one for another year that has all the same number of wires and same color wires, so I've referenced that. Any hints, tips or advice would be appreciated! Thanks!
    • By DPDISXR4Ti
      I hadn't driven my Kodiak for a two months, and since it was low on fuel, the first thing I did was filled it up to maybe 7/8 full. Getting ready to start it, I rotated the fuel selector switch to "on" and within seconds I smelled and saw fuel dripping onto the floor. I quickly turned it off and the fuel gradually stopped - I can repeat this.
      The fuel is flowing from the hose that is connected to the bottom of the carb, and routes around to the left side toward the wheel well. Any idea what's going on here? It ran fine the last time I had it out.
      Thanks...
    • By jhamrick75
      If anyone is having issues with the Mikuni VM24SS carb, I thought I would post what issues I had and how I resolved them.
      Acquired a 93 Bayou 220 that had sat for over 4 years.
      The carb was extremely corroded and pitted and full of leftover fuel.
      Cleaned carb and bowl and was able to get the engine to start.
      Within 30 seconds exhaust would heat up and start to glow red hot.
      Removed carb and recleaned everything, including a second overnight soak.
      Needless to say, after removing the carb for the 5th time and my frustration to the limit I
      realized that my attention had been to the carb body and not to the bowl.
      There is a small brass rod on the bottom of the carb that goes down into the float bowl but is seperated from the main section. I had cleaned that area very well....I had thought.
      ***The corrosion had sealed off the channel that runs from the main bowl section to the small tube section on the side of the float bowl. No amount of carb cleaner was going to get it to budge. So i took a small nail and started to scrape away the corrosion and was eventually able to dislodge enought of the corrosion that carb cleaner would flow through that channel. ***
      I thoroughly cleaned each side of the channel in the float bowl and reinstalled the carb and now the issue of it running lean is gone.
      On a second note the fuel mixture screw was a nightmare to remove as the threads had been corroded and wouldnt let the screw come out. I used a little cutting oil and worked the mixture screw in and out until I was able to push past the corroded threads and completely remove the needle. After a couple passes with a tap to clean the threads it is like new again.
      Hope this helps if you are having a lean running machine.
    • By P_syko
      Which is more reliable? Shaft or chain drive? 
×
×
  • Create New...