Originally posted by TMizzle
I will try a #5... is that a hotter plug? If so, how about a MC59?
I am almost 100% sure there is no leaks because during my last race i had to take the D21B out and put in my RB S7 and it ran with no problems using the same pipe and fuel system.
My friend is having the exact same issues... car idles great and runs great until we go WOT then it acts like it has loaded up with fuel and wants to die.
Yes,#5 is hotter than #6. Sorry I don't know much about MC59.
Because you have ever mentioned backfire that is why I ask you to check leaking. It usual happened when somewhere leaking,the back pressure is not normal or the serious dented pipes.
There is another way to check it out. Take out the back pressure line from the fuel tank cap,and plug up the back pressure line with a screw or something. Then try again to go WOT...
If it work better,that mean the back pressure is too big or the pipe not fit with your engine. Try to shorten the pipe may help. I knew some top guys even don't use back pressure on their buggy...
Try it! That is what I can say. I learn from what I have ever tried.