Here is a 2-stroke modification to increase the blow-down time and increase the exhaust pulse signal strength to the pipe. This modification is not for beginners and can be done by hand, machine, or CNC. The summary of the mod is to modify your piston dome to match the shape of the upper portion of the exhaust port (the curve of the oval). This allows more area to open for the exhaust to exit in a shorter time (degrees). One method would be to blue the exhaust side of the piston, insert it into the cylinder up to the point of the exhaust closing, and mark the piston with a dental tool (sharp narrow tool). Next mark on the piston the outer edges of the exhaust port (some thought when modifying triple exhaust ports). Finally decide on the limits of upper land on the piston, the angle of the cuts, and edge cut radiuses. Carefully cut the piston(s) with appropriate tooling. Here are some example pics of how to modify a Blaster engine. Many other layout and/or machining approaches are, of course, possible for this modification, and exhaust port timing as well as time/area need to be considered.
Wheeler Piston Scallop Mod (WS Mod)
Pro Circuit's Engine Plug Kit is a must-have item to attain that works look. Each piece is CNC machined from aircraft-grade aluminum, anodized red and hand polished.
CNC machined from aircraft-grade aluminum
Upgrade the style and performance of your bike by switching out its stock hoses with Pro Circuit's Standard Radiator Hose Kit. Our radiator hose kits feature premium-grade silicone throughout, which can operate at higher temperatures and pressures than a stock rubber hose. The hoses are topped off with a highly pigmented bright blue that will stay vibrant and not fade over time - making the Pro Circuit Standard Radiator Hose Kit the perfect way to customize the look of your bike while still increasing its performance and functionality.
Replaces stock hoses
Made of premium-grade silicone throughout, inside and outside
Operates at higher temperatures and pressures than other rubber hoses
Premium blue pigment that will stay vibrant and will not fade over time
Allows the removal of the Air Induction System for lighter weight and added performance on WR models.
This accessory is restricted to closed-course competition use. See California Regulations regarding Emission-Related Parts and Accessories for products for closed-course competition use only.
Whether you're a seasoned wrench who justs wants to compare notes or a top-end rebuild No0b, here's a great article on the subject, including pics. Give it a read, share any comments in the comment section, and share with an any 2 stroke ridin' buds that might benefit from it.
Just bought a used bike, noticed the oil was black, did a complete flush and change with filter, then rode about 3 hours worth, checked my oil sight glass and it was absolutely empty, even tried tipping the bike, and I couldn't see any in the window. I don't see any oil leaks, the exhaust is a little blue, but an entire quart in 3 hours? Any ideas what could be causing this or where the hell my oil is?