Hi - can someone please recap what changes are necessary to successfully convert to premix on a polaris 2 stroker (in my case i have a 1994 300 4x4 ). Spam wordSpam word Spam wordSpam word Spam wordSpam word Spam wordSpam word please include any internal carb changes, such as jetting changes Spam wordSpam word Spam wordSpam word Spam wordSpam word Spam wordSpam word

I actually bought mine after it was already setup on premix, but tryin to ensure that all necessary steps were taken.

Thanks

 

On the 300 the injector line went from the oil pump to the left side of the carb. This inlet needs to be capped off to keep from sucking air. You can leave the oil pump hooked up and still use the split throttle cable if you wish and just drain the oil tank,if it's still there and not blocked off. I'd premix at 40-1 ratio,any richer on oil, say 32-1 is too much on this low compression engine.

 

thank you for your reply.

- any re-jetting required? if so, to what?

- re: compression, what is spec comp for this engine and what is 'acceptable range'.

 

Rejetting normally not required.Just always check the spark plug.Should be a tan to medium tan on the electrode. Compression ratio is 6.1/ to 1 according to the manual. Very low compression ratio engine,same as the 250. The piston/cylinder compression reading isn't shown in the old manual I have,but if your showing around 130-140 psi range reading,this is what I've found on most good running engines.

 

OPT, Where is the oil inlet on the carb that should be capped on a 97 250 4x2?

 

Oil for the 250 engine isn't injected into the carb like the 300 is. It's injected into the base of the cylinder. This little nipple needs to be capped off if you premix whether you remove the oil pump or not so it won't suck air into the cylinder. Item #29 on the parts list. Dirt Cheap Yamaha, Honda, Arctic Cat & Polaris OEM Parts & Accessories – Cycle Parts Warehouse