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So yesterday I picked up a 1994 sportsman 400. I'm new to the ATV world...I've rode quite a few but never owned one. How in the heck do I tell if this thing is a 2 stroke or a 4 stroke? The place I got it from seemed unsure...

sheesh....about 30 kms into my riding today this thing is squealing like crazy at anything below 5000rpm....even in Neutral.

What in the eff?!

Rode another 40+ kms....lots of travel at bout 6000 rpm, old back roads, etc....

I guess I'll pull the clutch cover off and have a looksee inside at the belt and clutches. I just love that bottom row of bolts...

I should have listened to you guys. Great product with a VERY poor way to connect them. I may try to figure a better way to mount them, linq system sucks.

Has anyone add their own homemade heat shield to the right panel of their quad? Looking to put something behind the plastic panel but not sure what works. It's almost uncomfortable in the summer. Thanks for any info.


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I just bought a Magnum 400 and the carburetor will need to be cleaned out from where it has sat for several years. I've cleaned/rebuilt dozens of carburetors on just about everything. I found it to be hit or miss.

The last carburetor I messed with was on my daughter's "Peace" 110cc ATV. I took it apart and it had a bunch of green funk in the fuel bowl and jets.

Afterwards it ran but fouled the spark plug where it was running too rich for some reason. So I ended up just buying a new carburetor for $13. For that price, they are not worth messing with.

If I have no luck cleaning this Mukini carb on this Magnum 400, have any of you guys found a Chinese knockoff that will work on this engine without having to muck about with jetting and all?

No I don't have the model number of the carb but while I have it off, I'm going to write it down in case I have no luck cleaning it out.

Also, what have you guys used? I've used everything from soaking the carb in fuel injection cleaner, boiling them on a hot plate with Purple Magic.

I've heard MEK (which is technically a paint thinner) works well. I smuggled some out of work and plan on giving it a shot.

So i bought this 1996 Magnum 400. It's been sitting for some time but my co-worker says it ran when parked due to fuel issues. I know the motor is not locked up.

It does not run but the guy told me everything wrong with it was related to the fuel system such as the nipple broke off the petcock valve and the fuel pump. The carburetor is clogged up from sitting of course. The brake calipers will need to be taken apart and cleaned and lubed.

I'm not sure what else I might find when I get into it.

Anyway so we put it in neutral and rolled it onto my trailer. I locked it into forward and strapped it down.

So my father and I get home and when I tried to pull the shifter into neutral, it must have went into reverse and stayed there.

For some reason the lock nuts on the rods were backed off. I don't know if that has anything to do with it.

I disconnected the rods that go from the shifter to the transmission and disengaged the transmission by using a 1/2 wrench on the nuts.

So the problem is not in the transmission but the shifter box.

As of right now I can move it from shifter from forward to reverse but it's real stiff and cannot move it into low range.

Unlike my Xplorer 300, the shifter is REALLY stiff. Unlike my Xplorer the boot was not busted so there is no way water could have gotten into it. This thing appears to use the same shifter as my Xplorer 300.

Any chance I fill it full of PB Blaster and loosen it up?

Which brings another question. The shop manual says to put something like 0W30 motor on it. About 1 ounce.

How are you supposed to get oil in this shifter box? Remove the three star heads and pull the lid off and pour it in?

Sounds like it may just need a good cleaning in kerosene and new oil and might fix the problem.