Motorcycle

Welcome to the Quantum Racing Industries Motorcycle Section. Check out the latest news and featured products on this section.

CP Pistons Now you can buy the same quality of pistons the factory guy’s use. CP Pistons are available in standard size or oversizes. Compatible with oversize valves and higher lift cams, CP Pistons incorporate an "X" style forging for additional strength, durability and reduced weight...  Read more on CP Pistons...

Xceldyne Valves Our Xceldyne Titanium Inlet Valve kits are made from the highest quality materials, with a thicker PVD coating than any OEM valve for outstanding wear resistance in the Seat, Tip and Guide area's. Xceldyne valves are shaped for maximum flow...  Read more on Xceldyne Valves...

CV4 Silicone Radiator Hoses Available to suit most off-road, ATV and also some road bike applications. SFS Performance direct replacement hose kits don’t just add race-bred style to an engine; they also provide peace of mind. Their high performance construction ensures total component reliability...  Read more...

 

 

 

The piston is going great, the bike makes a heap more power and I’m really happy with it.

I’ve done a round of the AORC and one of the VORC on it so far and I’m running CP and CV4 stickers on the bike. I’ve also put the post below up on Dirt Bike World under a thread on preparing a WR250 Fro racing.
Mod No. 4. CP 13.5:1 compression ratio "mx spec" piston.

This is without doubt my favourite mod to date. It looks substantially different to the stock piston, with shorter skirts, teflon coating, a single ring (stock piston has 2), cnc machined crown and different webbing underneath. The gudgeon pin is also DLC coated and is substantially shorter than the stock one.

The result is substantially more bottom end and mid-range power and MORE top-end/over rev to boot! I expected to loose a few rpm up top as high-comp pistons usually result in, but the bike now makes enough top end power to "get you into trouble" in 3rd gear and is almost as powerful as the 2011 RMZ 250 I had. My theory is that the lighter weight and reduced friction of the single ring and teflon coating help to create the additional top-end but I'm no mechanical engineer so I'm really only guessing. There is however no two ways about it, the bike now rips.

Owen Lock
Adapt Australia