Gettin started!

[BLACKEDOUTX19]

So i picked up a Polaris 398cc engine and an off road go kart frame the other day. Me and my grandpa are going to rebuild it and make this puppy a runner. I don't know if the engine works so, help me out guys...

 

[lemegacool]

welcome here!

first thing i would do is check for compression and spark... if you got these then it should not be hard to get running. second : clean the hell out of the carbs using either carb cleaner or gasoline. then hook up gas and crank it!

good luck!

 

[Gearstix]

Dont forget to synchronize the carburetors so you don't lean out on one cylinder and burn it up.

 

[BLACKEDOUTX19]

I tested it out and it has great compression. my friend think sit has something to do with electrical??

 

[BLACKEDOUTX19]

So the toher day i checked for compression, and that sucker pulls your finger in hard ahha. Spark is gone, and i think it is the igniton coil. Can someone link me to a site that has ignition coils, and other parts for this engine???
Thanks Guys

 

[BLACKEDOUTX19]

come on guys, someone help me here!

 

[jr dragster T]

Well to be able to help you out with parts we need to know a model number/make etc.

 

[lemegacool]

correct me if i'm wrong but could you just use any other similar coils (like a bike coil or wathever)

 

[BLACKEDOUTX19]

Ok model is:
I Know it is a Polaris 398cc Motor,(might be a 1970 Polaris Charger motor) might be bored out to 440 but dont know. Thats what the guy said.its a EC40P.
the engine is a two cylinder two stroke with a cooling fan built into the flywheel. It is rated 27 hp at 6,500 RPM. It has 2 Mikuni VM30 carburetors on it. is the oil mixed with the gasoline at a specified ratio of 20:1?? That's 1 US quart of 2 cycle sled oil mixed to five US gallons of regular gasoline right??. Spark plug is NGK B7ES gapped at .020"?

 

[BLACKEDOUTX19]

Anyone got any info to help me with parts?
And what gearing should i run to get a lot of low pull, but still hit like 55?
It is going to be an offroad kart, as i have like 15" tires on the back that are like 8" inches wide.

 

[Kaptain Krunch]

a 5:1 ratio would be good, that will give you a calculated top speed of 58 at 6.5k, not accounting for the torque converters overdrive (plus the engine might redline higher than 6.5k). As for gas oil mix, 20:1 seems like a thick mix, but if it runs fine on that then go for it, but you could get away with 32:1.

 

[BLACKEDOUTX19]

Okok sweet. How do you check if your engine is bored? Because the guy said it was 440cc, but the block is only 398cc???