Hi I just rebuilt my blaster and well I had it apart I modded my exhaust. I heard a rattel in the exspansion chamber . So I cut it apart and realized the little cone had fallen off. I decided to cut out the restriction. So today I finished it and took it for a test drive and it runs like crap. It idles good but if you get on it , it dies and cuts out. Would doing this to the pipe cause that or would it be a rejetting thing.
Blaster not running to well
- Thread starter wyattearp29
- Start date
If you freed up exhaust flow, rejetting is a must. Expansion chambers aren't like 4 stroke exhaust where just freeing up flow typically helps. I don't know what's in an OEM but as far a OEM pipes go, they are pretty good. If it's not ran like you think it should since rebuild (I'm assuming at least bore/hone/piston and rings) there is a few steps that really improve your chances of having a good running long lasting engine. Leak down test, proper break in, safe jetting and plug chops til you have it dialed in. Better description on the problems, when they started and what work had been done just prior will help a lot in getting you answers quickly.
big mistake,correct me if im wrong but the cones for backpressure witch a 2 stroke NEEDS backpressure thats why the pipes HUGE
Not really back pressure. The blocking nature of tuned pipes is from sound waves. When ever pressure moves through changing areas (area as in circumference) it slows down or speeds up velocity, creating low and high pressure waves. The shape, length and volume of the cones and chamber cause rebounding waves. Those waves reach the exhaust port in a specific amount of time and block incoming air/fuel charge into the cylinder. To my understanding, the stinger is the only section of the pipe that would create a true back pressure. There is a lot more to it, that's a very condensed explanation as I understanding. I'm no expert and certainly not capable of designing an exhaust system.
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