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)
ACT releases wide ratio gear set for the DRZ 400 and KLX 400.
From the makers of race proven automotive clutches and flywheels, ACT brings you wide ratio gear sets for the Suzuki DRZ-400 and Kawasaki KLX 400.
Although the DRZ-400 is a very versatile machine, the stock gearing does not allow riders to take full advantage of the bike's potential.
The stock gearing on the DRZ-400 may work well on trail only use or for city driving, but is far too closely spaced to be practical for dual-sport or highway use.
With the abundance of power adders available for these bikes, the close gearing becomes even more apparent.
The addition of an ACT Wide Ratio Gear Set will dramatically improve the rider experience and wear and tear on the motor at the same time.
ACT Wide Ratio Gear Sets are engineered and manufactured to exact specifications to allow for direct replacement of the factory gears onto the shafts.
Modifications are required to two shift forks and the case for proper clearance of the larger fifth gear.
WHAT IT DOES
Using the principles of centrifugal force this clutch automatically engages and disengages based on RPM. This means you can come to a complete stop in gear, without touching the clutch lever, and your bike stays running.
FEATURES AND BENEFITS – Prevents engine stalls – Clutch lever use is optional; lever feel and function are unchanged – Smooth power engagement increases traction – Cooler operating temperatures and incredibly efficient clutching provide extended clutch life – Allows riders to refine skills like precise throttle control, line selection, and cornering – Proprietary billet components offer superior durability – Riding is enhanced, more fun, and less demanding so riders can conquer more terrain – Fully tunable to suit rider and/or terrain – Manaul shifting of transmission still required – Installation does not require modification of stock parts
By Dr. Damage
I am wondering, I was told there was a trick to splitting the cases on this bike.
Someone very experienced in motorcycle mechanics told me that the bike had to be in 3rd gear to be able to pull them apart.
Does anyone have any information on this subject? 1991 and 1/2 Beta Zero 250 Jordie tarris signature edition.
So i want to buy a 2010 450rr but im a bit worried about the parts i can find in US, so since beta uses a ktm engine, which engine would that be? So if i need parts i better look for ktm engine codes instead of beta ones, for example, i was just checking for a beta clutch kit... And couldn't find any in ebay for example... So not sure if is a good investment to buy this bike. I read a ton of possitive reviews, but also want to be covered on the parts side... One thing also is, aftermarket parts, there is not much... OR MAYBE, im not searching well, so would appreciate your advice here (cheers)