Hello, my 88' polaris trail boss will not start, it is getting fuel because if i remove the plug i can ignite the fuel in the chamber, ive tried using choke, and "pumping" the throttle. Also i seem to have a pretty weak spark Although ive never seen spark on an ATV before only on cars. It almost seems like the spark isnt enough to ignite the fuel and start the engine. If i remove the plug and spray in some starter fluid it will start and run. But will not start otherwise. Any help would be appreciated

 

Do a compression check, hope fully you'll be above 110psi. Doc

 

yea i was getting 110-115psi compression. I also forgot to mention this was bored out and is now a 310cc i believe. IDK if that has anything to do with it. But if it was my guess its somthing to do with the ignition the spark is so weak, that it almost has to be dark to see it.