sorry for another lame jetting ?

[Casgallo]

Hi all,
[cliffnotes at bottm]

just bought a blaster from my brother and it had been bored 40 over.(never jetted if that matters) when i bought it it had a broken reed, got a set of boyssen(sp) reeds, got it running but ran horrible, seemed to run hot no power etc. etc. compression test yeilds only around 80psi. cylinder was all beat up, to far to be bored anymore.

So I ended up getting a 240 kit off of cheapbay with new piston. I did some very minor portwork while i had it apart. (By minor i mean no new crossholes or anything, cleaned the exhaust up and rounded the giant square in the middle of intake)

All I am looking for is a good safe place to start my jetting. I do not want a race machine or anything so I would like to stick with the stock carb.


[CLIFFNOTES: 02 blaster 240, very minor portwork, all stock intake /exhaust. only mod is boyysen reeds. need to know a safe main jet to start with.]


one more thing, I am worrired about the bottom end seals being bad does anyone have a link or tell me how to do a leak down test on one of these bad boys?

THANKS VERY MUCH!!!

 

[CC&Fabb]

First of all, you need to get an aftermarket exhaust, even if its a FMF set up, for a 240 kit or else it will never run right. Second The stock carb will work. maybe you could start with a 310 main jet. Also,if the bottom end seals are bad then just replace them. 80 psi is not good.

 

[wrench man]

I ran a 390 jet in my stock carb before I got my bigger carb and stroker crank.

 

[Casgallo]

why do you say I'll need an aftermarket exhaust? you think it would have to much back pressure? I just got a 310 main jet to try thank you for the advise. is there a way to check the bottom end seals? I do not know if they need to be replaced or not?