Sportsman 400 Clutch Kit

I have a 1994 sportsman 400 2-stroke. I am looking to get a bit more power out of it and I have read that some people have installed clutch kits on their Sportsmans with some great results.

The riding I usually do is trail riding in the rocky mountains in Utah. So trails can be a basic dirt road, and 100 yards later, a steep rocky road. So I am looking to increase the lower end power, without giving up too much top end speed.

I cannot seem to find any tech articles about what weight of clutch kit spring(s) to use, whether to change the weights, and or what combo of spring / weight would give me a good power boost.

Any information would be very appreciated.

94 Sportsman 400 Clutch Kit

I have a 1994 sportsman 400 2-stroke. I am looking to get a bit more power out of it and I have read that some people have installed clutch kits on their Sportsmans with some great results.

The riding I usually do is trail riding in the rocky mountains in Utah. So trails can be a basic dirt road, and 100 yards later, a steep rocky road. So I am looking to increase the lower end power, without giving up too much top end speed.

I cannot seem to find any tech articles about what weight of clutch kit spring(s) to use, whether to change the weights, and or what combo of spring / weight would give me a good power boost.

Any information would be very appreciated.

October carnage progress!

1 down 2 to go!

In October, we took the whole family for an ATV weekend. I took all 5 of my machines. 600, 500, both Magnums and the Predator 90 that I got for the grandkids. Son in Law borrowed a 900 Razr.

Turns out the best tool I took with me was a tow rope. Both the 325 Magnums and the 90 ended up on a tow rope. The MOSE committed suicide I think. Blew the oil cooler line off and spit all the engine oil out onto the trail. The other Magnum just stopped running. Pull the rope, and couldn’t feel any compression. The 90 stopped running while I was using the winch on the wife’s machine to get her unstuck.

I figured out the 90 is an electrical issue. Problem is the previous owner took the key switch out and rewired it according to instructions he found on line. I can’t make heads or tails out of the mess, so I will start with a new harness and key switch later this winter.

Dove into the 325 first as that is what I have a plow for. It had broken the timing chain. Piston hit the valves and bent them both. Piston was scored, shattered the crankshaft gear. New piston, rings, valves, timing chain and gear….Gasket set and time. Finished that one yesterday. Back on it’s wheels ready to plow! In the upper right of the first photo, you can see that the chain failed at a link. Haven’t been able determine the exact chain of events, just the end result. Pretty sure the chain failed first.

Next one up the MOSE. Got the plastics off and the engine on the bench today. Tomorrow I will tear it down. Crankshaft is not stuck. Has plenty of compression. I think the loss of oil pressure caused the rod bearing to fail. I put the hose back on and fresh oil back in it after we got it back to the cabin. It would run, but loosing power. Shut it down and winched it on the trailer. I think the rod bearing has failed.

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Just Joined from Mass

Hey All,

I just bought a used 2015 TRX500FM5F. It’s a real clean machine, barely used, kept indoors. The owner couldn’t find the owners manual. I know the basics, but I would like to understand the instrument panel, how much air to put in the tires, maintenance suggestions, basic stuff like that. I did find the service manual on here, thanks DB ! Are there copies of the Owners Manual here ?

My main concern right now is the blinking engine light. According to the little bit of reading I’ve done here I think it’s a Code 23 or oxygen sensor. If anyone can steer me to some threads that would be great. Is it something that needs to be dealt with immediately ?

Thanks !

2002 foreman rubicon carb issues

I have a 2002 honda foreman rubicon 500 that will idle sometimes without the choke on,but I usually have to leave it on. It will spit and sputter and blow white smoke as if it was running lean but when I check the plug it’s always black. I have rebuilt and clean my carb more times then I can count and I have also replaced my air filter and spark plug and but still no change.it had sit out in the weather at my grandparents house for about a year before I rescued it. Any advice would be greatly appreciated!!

2006 trx400fa issues

I have a 2006 trx400fa. A while back when I would put it in reverse (and sometimes it did this in drive) the gear indicator would go to just "–" and it would pop and sputter and barely move. If it had been run for a while and warmed up it would work fine. Then recently I had plans to take a trip and go riding. So I wanted to get this issue fixed before I went. I started googleing away and found that it could be the angle sensor, I tested it and it was bad. So I purchased a new honda one and installed it. I did the preload and everything and it was still not working. So I did more googeling and found that the battery could be the issue. Then I took the battery to the local dealer and had it tested and it was bad. This was not surprising as it was the original battery. I then purchased a new battery from the dealer and installed it. I then wen’t through the initialization process and it Worked! I rode it around a little bit and everything including reverse was working perfect. I loaded it up and the next day left for my trip. When I got there I unloaded it and everything was fine. Then the next time I put it in reverse it stared all over again. The difference now was that in drive if I came to a complete stop it would go to "–", but if I would take off and go without stopping it was fine. I am getting code 5. I have read all the forums and watched all the videos. I have tried all the troubleshooting steps with no luck. Can someone please just tell me how to fix this?

Brake fluid reservoir HELP

It’s been a while since I posted on here but it was extremely beneficial when I did…. thank you.

A few weeks ago I noticed on both of my 2015’s brake reservoirs on the handlebars were leaking from the gasket in between the cap and housing. Both have been garage kept since new and don’t take many trips to mud…. is this a normal Polaris thing? I’ve had Hondas 10-15 years old that never had that issue… just curious if a temperature change will cause enough expansion to overtake the gasket. Both caps were hand tight as I’ve never checked them until now. Both seemed to be on tight enough to seal and remain sealed. Any help much appreciated.

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2016 Rancher Smoking and loud noise, now overheating too

I’ve got a brand new 2016 trx420fm1 that I bought a year ago. I haven’t ridden it much(55 hrs worth) but I got deployed to Japan for 6 months and left it with a friend of mine who decided to take it riding. While he was out it started smoking and ticking real bad. The dealership told me they were gonna have to replace the crank and everything so naturally I said "screw you, I’m not paying for that."
Now, I’ve replaced the valves twice and it hasn’t even remotely fixed the smoking issue. I’ve read almost all the blogs about 4 wheelers smoking, and tried all the solutions, compression is 120psi and the piston look fine. Granted I’m not a pro but shouldn’t doing this 2 times be stopping something? I just put it back together from the 2nd valve job and now it’s overheating by the time I get to the end of my block test riding it.
There’s also a ton of oil in the muffler. If anyone else has any ideas that would solve a world or worry and confusion! Thanks in advance!

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Shifting Problem

Hello all,

I have a 2001 Honda rancher 350 electric shift that is having shifting problems and I need help right away! Im trying to kick it on down the road and cant sell it until I figure this out.

Basically, I swapped a motor out that ran from another machine with the one that was in it because the electronics thought it was in 4th but wasnt, (posted the problem on another thread, got no responses) and the "new" motor wasnt shifting properly and I assumed it was the shifter motor, looks like that wasnt the case because trying to diagnose my current issue, I tested that shifter motor and it worked.

So this is what happens, the thing will not shift using the electric shift but the foot shift works and it knows what gear it is in. I tested the shifter motor and that works. I replaced the switches and that didnt work. I replaced all the fuses and still nothing.

I need some help with this because I am at wits end and just want the thing sold so I can pay off what I have been doing to my 02 rancher. Please any insight at all will be much appreciated!

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