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predator 90 premix
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Posted by: hannibal3495

Can anybody tell me what the mix should be if I am using polaris PS2 oil? I think I want to remove the oil injection.

thanks

Scott

Posted by: bigdaddy

I would mix up a small amount at 32:1 and then do a plug check. Usually 32:1 works about perfect.

Posted by: hannibal3495

Thanks for the info. i have a couple more questions. when you say 32:1 32 parts gas to 1 part oil = 128 ozs of gas(1 gallon) to 4 ozs oil. Is there a better oil to use?

Thanks

scott

Posted by: bigdaddy

We used Bel ray H1r. I bought a ratio right mixing cup to get it right. You can buy them at bike shops and also use them if you have any other 2 stroke motors.

Posted by: OKTRX450R

We are using the Klotz Super Techniplate and mixing at 32:1 also...says on the bottle how to mix it. If I remember correctly it is one bottle to 4 gal of gas...we also have a ratio rite if needed.

Posted by: r81275

can't beat the smell of cator 927 lol

Posted by: 03sp500

We use Amsoil Dominator oil at 45:1 and VP c12 Racing fuel seems to work ok

Posted by: 300maniac

i use 40:1 plus i have a 110 big bore kit

Posted by: ALEXANDERJASON

IS THERE A PERFORMANCE ADVANTAGE TO REMOVING THE STOCK OIL INJECTOR AND TANK AND PREMIXING?? JUST WONDERING WHAT THERE IS TO IT BECAUSE IT SEEMS LIKE ALOT OF PEOPLE DITCH THERE PERFECTLY GOOD (AND HASSLE FREE) OIL INJECTORS, BUT I'VE NEVER HEARD WHY.

Posted by: 250rbadboy

their not reliable enough.mixing the oil in the gas will neaver seized the motor.it doesnt take much to hurt a high reving motor.

Posted by: 400exrider707

Each oil blends differently with a specific fuel, you should always go by the oil manufacturers suggestion. Removing the oil injection is a good way to shave some weight and add reliability, provided you remember to mix the oil.

Posted by: wrhracing

quote:
Originally posted by hannibal3495
Can anybody tell me what the mix should be if I am using polaris PS2 oil? I think I want to remove the oil injection.

thanks

Scott

Doesn't it say NOT for premix on the bottle?
Some oils are diluted so they work in injector systems.
If the manufacture says not to do it on the bottle then I would recommend not doing it.
Other wise start at 20 to 1 and maybe, work your way up to 24 to 1. Injector systems are set up to work with a 20 WT. 2 stroke oil not a concentrate like used when pre mixing.

Posted by: wrhracing

quote:
Originally posted by ALEXANDERJASON
IS THERE A PERFORMANCE ADVANTAGE TO REMOVING THE STOCK OIL INJECTOR AND TANK AND PREMIXING?? JUST WONDERING WHAT THERE IS TO IT BECAUSE IT SEEMS LIKE ALOT OF PEOPLE DITCH THERE PERFECTLY GOOD (AND HASSLE FREE) OIL INJECTORS, BUT I'VE NEVER HEARD WHY.

Generally a cleaner running, better responding engine. There are plenty of high grade injector oils...but.... There are plenty of really high performing premix oils.
The injector systems put on these machines are good for moderate horsepower increases. As the need for more horsepower is met so is the need to up the lubrication quality and consistency.
The last race bikes, 2 stroke dirt bikes, that came with oil injection were the Can Ams of the late 70's, and the TM Suzuki series which ended in about 1975.
The weight loss and the parasitic drag on the crankshaft driving the oil pump are 2 good reasons for it's removal. The plus of removing the oil tanks is the additional room made available for expansion chamber design or rear shock laydown position.
IMO

Posted by: myersracing41

I hate to sound like a dummy but is it as simple as plugging off the tube that runs into the carb, and then just removing the rest of it like tank and pump assembly or is their more to it?
Thanks Jason

Posted by: wrhracing

Yes it can be as simple as that. I would consider calling Terry Cable and buying a single cable for your carb.

Posted by: myersracing41

I went ahead and changed it over but I do need a single cable.
Thanks for the info.