Comments on: Who knows 2-strokes?

By: Brett

Brett — Sun, 26 Apr 2015 05:34:10 +0000

If you have a reed injection, look into getting some Boyesen power reeds. Did a uni filter, re-jet, power reeds, and mx expansion chamber. Went from 28 rhp to 37. Also running 16/39 gearing, from 14/50. A little more carb tweeking, and I should be real close to hitting the ton. Not bad for a Yammy DT3 250.

By: Carson

Carson — Mon, 16 Dec 2013 13:59:02 +0000

@Ed

theres really no need to mess with the piston. Unless you get into some heavy porting then you’re not really going to notice a big difference.

Those little bikes haul pretty well without any modifications. But if you want a little more kick out of it, my best suggestion would be a pipe and to re-gear it.

The only thing I did to my little Suzuki GT185 is swap out to pod filters, up jet, and modify some old RD250 pipes to work on the bike. It brought the power band on the pipe up from the bottom end to the mid-range and the bike rips now.

By: Ed

Ed — Sun, 15 Dec 2013 18:58:20 +0000

@carson
I might not fuck with the piston at all.
It has a pod filter so I opened up my jets a bit… But other than that I might not do anything else.

By: Steve

Steve — Sun, 15 Dec 2013 15:11:24 +0000

I love how simple 2 strokes are and how easy they are to modify/fuck up. Going to try to get more power out of my ’79 250 this winter. Started reading this:

http://www.amrca.com/tech/tuners.pdf

By: Carson

Carson — Sun, 15 Dec 2013 14:01:20 +0000

If you’re going to raise the intake side of the piston, I would suggest raising the exhaust port the same amount to allow for an even flow. If you’re gonna let more fuel and air in sooner then you also should allow for the sooner release of exhaust gases as well.

Side to side you can open up the transfers, intake and exhaust ports pretty much to your hearts desire, but once you start going top to bottom you start to play with the intake and exhaust timing and that can get confusing real quick.

if you start playing with porting, make sure to leave the intake rough, as that helps to mix the air and fuel, but polish the exhaust port to allow a smooth exit.

I’d also suggest looking for an expansion chamber if you really want to get a kick in your ass on that thing. Thats gonna be a fun little bike to rip around on.