Running 200:1 in your 4 stroke

[01KX5WOODSRIDER]

  I have been running 100:1 in my RZ-350 and DR-350 with no negative results. I havent torn either engine down since but I have
checked exhaust ports when the pipes are off and there hasn't been
any carbon buildup. 

[kawasaki_kev]

Funny I've just ordered a 96 kx450F and was wondering exactly the same question. I have come across this on a diesel van forum and a lot of folk were claiming quieter running from startup along with better fuel consumption. I think they were also running at 200-1 and recommending cheap mineral two stroke oil. One German posted up TUV emmisions results before and after on a well worn engine and it passed when added. Any more trying this out? (Vehicles or X bikes)

[redlined_KX500]

I've been mixing my 09KX450F at 200:1 with the Bel-ray MC-1 and C12 fuel.
 

Just over 15 hrs on bike thus far, runs awesome and seems to run cooler than comparable bikes I ride with. Also no changes in valve clearance. Unlike alot of riders I see, I make sure engine is very warm before I start rapping the throttle on make a couple of passes on pit road at partial throttle to cool engine before I shut it down.

As good as this bike runs, it's still anemic compared to my K5.

[Dutch-K5 Fan]

 Also no changes in valve clearance. I make sure engine is very warm before I start rapping the throttle on make a couple of passes on pit road at partial throttle to cool engine before I shut it down.

With my RMZ 250 I didn't run pre-mix, and in 4 years I had only changed valve clearence one's. Not even
when I put new valve's in. Don that 4 times. Now I'm not saying Pre-mix is bad for 4strokes, think it's not necessary.

It woulden't hurt also if you don't use to much!!


Dutchie

[KXcam22]

Dutchie,
  For me it's an experiment (my engineering moto is: "one good test is worth a thousand expert opinions") and an attempt to keep my engine alive an extremely long time.  It interresting that redlined mentioned cooler running.  I think I have seen that but didn't recognize it for what it was.  I put race temp strips on my rads and even after spending all day slogging in 1st gear I have yet to see very high temps or big boilovers.  This is my first 450 but I was expecting the worst for overheating after what I hear all the time.  I haven't even switched to engine ice yet.  The 2-stroke smell is nice. I have no fear of carbon due to previous results with the oil. I am also glad to hear I am not the only one doing this. Cam.

[Dutch-K5 Fan]

I'm not trying to say anything bad about you all !!!!
Wanted to say that KX Valve's and valve seat's are super quality.

I know some guy's that put 1:40 pre-mix gas in there 4stroke because they take there buddy's fuel tank.
And a few minuts later it was over and out. The plug was fould.

But I've thought about it. Pre-mix could lube the piston witch resultmin less friction. So more power and less heat!!

Do you run a 1.6 radiator cap???
The water can run hotter, but is much better than boiling!!!! When we in Holland started to ride the 04 RMZ250.
we run it a little rich, so it could cool.


I'm intrested to reed how it works out futher.


Dutchie

[augerman]

Ya, I run 200:1 Blue Marble in my WR250f also

[KXcam22]

Dutchie,
Nothing bad taken. Like a said just an experiment, but I feel good about it and have been getting good results so far. The extra lube would reduce heat, but then oil burns hotter which adds heat (although at 200:1 there is not much oil).  I have no plug fouling worries since my K5 never fouled a plug in the 15 years I owned it (at 60:1).  Thats whats so nice about kxriders, it may be a radical idea but people discuss and explore it. I posed this idea on TT and got flamed bigtime. Cam.

[azdirtrider75]

Very interesting idea. I plan to mix my fuel on my next 4-stroke. In fact I'm going to try it in my old 96 Ford Explorer that has 164K Miles. Follow me with your windows down and enjoy the 2-stroke smell as I try this out.

[Good]

I had a dream that I put premix in a Honda 4-poke the other night.   After my attempted backflip failed, I couldn't get the bike to run right...  Fouling plug...  Wierd dream but I woke up smelling Castor 927. MMmmmm!

[KXcam22]

Actually checked my plug today.  Rich, dry carbon but no oily residue. Need to tweek the jetting a bit.  25 hour valve clearances were perfect. Cam.

[jrhockey03]

This is a hell of an idea. It would have never even crossed my mind. I've got a kx250 2-stroke but I demoed the '09 KX450 and I didn't want to like it but I did. If I was going to race full time again I would definetly have one, but I do mostly woods riding and I like my lighter weight 2-stroke. If this would make the top end on a 4-stroke last a bit longer I would be all for it and a 450!

[PowerFiend]

I've run marvel mystery oil at around that ratio with no ill effects and clean exhaust ports, but that was mixing with U4.

[KX5Zuki]

This is just personal opinion, but if your going for longevity, then go for it. I have a KFX450R, the quad version, and I have aftermarket exhaust, DASA full stainless header pipe, and an air box eliminator, also, re-programmed for peak power. My exhaust will glow red about 12" up the header pipe, so I am sure your exhaust valves would be hotter than that, so, there would be no problem burning the excess oil off.