I have a 2001 Xplorer 400, which I recently removed the oil injection on and installed a wiseco piston. I would like to know what oil to use. I know oil use has a lot to do with personal preference, but I am just curious. I would also like to know what oil/fuel ratios have been successful. Thanks.

 

I used to use Bel-Ray Synthetic in all my motocross bikes (CRs, RMs, and YZs) and I ran it 44:1 and never had any motor damage. I rode those engines MUCh harder than a 4wheeler.

Why are you removing the mixer? My 1993 250 has been fine with the oil injection system.

I am buying a 2001 Xplorer 400 and I am going to run the Polaris Gold in mine. (I am leaving the mixer on)

Have you been happy with your Xplorer?

 

Use a good synthetic and you should be fine. I run maxima super m in mine at 32:1 and I haven't had problems. I have friends that race nationally and that is what they use.

Balzak
2000 scrambler 400 2x4
the mod god has been good

 

Weedy,

There is a cover over the oil injection pump on the 400 motor. If sitting on the bike, it is to the front left bottom corner of the engine, and it is held on with 3 screws. Under that cover exists the injection pump, and you must remove that cover in order to adjust the oil delivery. Oil delivery is set high from the factory for obvious reasons, however, they recommend you setting it correctly after the engine is broken in. Once my engine was broken in, I removed the cover plate and adjusted the oil pump to the correct setting. To my surprise, even though I had ridden in very little water, there was moisture behind the plate. To make a long story short, I have removed the cover 2 additional times, and found moisture and corrosion setting in. My thumb throttle began getting harder to press and the return was slower. I feared that the corrosion to the externals of the oil pump were causing this, so I removed the oil pump and put the block off plate in place, and went to premix. Longer engine life is supposed to be expected when running premix, but it may not be substantial enough to justify the extra trouble of having to premix. Other than that, my 2001 Xplorer 400 has been an excellent bike. It does load up on me and bog down in deep water/mud, but I'm thinking that the main jet is too big. I'm experimenting with that a little at a time.

 

I had about the same experience as Walexa. I removed my injection and went to pre-mix after removing the oil injection screw and finding it spitting out a milky looking mix of oil & water.
This was when I was redoing the top end after a piston failure. I have to think that oil/water mix had something to do with the piston failure. I wasn't about to invest in a new top end and then have it fail for the same reason. I don't know if water got in there from condensation or from playing submarine in the creek, but I know what was coming out of my injection line wasn't the same oil I was putting in the oil reservoir. It's definitely easier to go with the automatic oil injection but I would rather deal with a little inconvenience than to deal with alot of it when the piston pukes.
I used to run Klotz Techniplate which is a castor based oil but I've since changed to
Maxima Super. I actually like the smell of the Klotz when it's burned but I think the Maxima is a better oil.

 

Myself and several others at our shop love the Amsoil 100:1. Of course you should see the look on a customers face who don't realize that the ratio for performance oils are set by the oil producers. They usaully think we are nuts for mixing at that ratio so I tell them if they don't want to try it use the Amsoil 50:1 premix/injector oil. Either one I have yet to see any damage caused from lack of lubrication. We have ran several 250Rs, Banshees, a few Sports, a Quadzilla, and a NOS breathing 800cc triple Mach Z with the 100:1 premix. Hell we even run it in are chainsaws. But like you said it mostly comes down to personnal preferance. Run what has worked for you and stick with.

 

Hey walexa If you want to know the real proplem with the oil pump listen up. Ok This is what i was told from the tech service dept of polaris Also a real good friend of mine. Ok this is what is happening. Your cover plate on the injector housing is leaking and or the oil inlit hose and cable inlit, also there is a small drain hole on the bottom of the pump housing about 1/16 in size. Seal all those areas up with silicone So it is water tight. As for the sticky cable, bad return, The oil pump housing is getting junk in there and the vacume from the engine is pulling through the carb and pulling the junk moister and setiment up the oil pump cable into the splitter box which makes everything harder to slide.Drill a small hole 1/16 " on the top of the splitter box and on the bottom, Take the cable of the bike for this. Spray lps or wd40 or cable life anything to clean the old junk out of the splitter block wait to you see the crap come out of the ends of the cable man it is black. After the lube comes out clean, dry the block and silicone it shut, the two holes that is. That should solve the problem, It worked on my 99 400 scram. I also siliconed all those areas on the new 01 400 explorer we just got, so far no problems at all with sticky cables or slow returns with that one. Hope that helps you out.