I just rebuilt my 85 lt250r, I had the cylinder bored out 60 over.
I put it all back together and it started right up, ran good for about 30 seconds then died.
note that it has been in pieces for about 5 years.
It sounds like there is no fuel making it to the cylinder.
I am no good with carborators.
I have good sprk and good compresion and it will fire when i pour a capfull of fuel straight in the cylinder. I can barley feel my leg from kicking so much!!

I also would like to know what is a good combination of aftermarket parts that i could get to see the best performance out of my quad
what works for you guys

Do i need to re-jet my stock carb because i bored it out 60 over.

 

is the fuel running out the petcok, is there fuel in the bowl . the float might have stuck or crud got it to one of the carb ports .

 

i would port it for $ 200 and a good paul turner pipe works well

 

If it has set for 5 years, clean the carb all out, and make sure the floats aren't sticking. Buy a manual if you aren't comfy with the carb, but the stocker is a pretty simple unit. There are a few small parts though. It may be beneficial to use a digital camera and document how things are supposed to go back together. Have you checked to see if fuel flows to the carb?

 

yeah, there is an vapor lock from the pet **** down to the carb, but when i take the fuel line off it flows freely so there is nothing wrong with the pet ****