2008 Road Race Season
The good news for 2 stroke racers is that BMCRC (The organisers of the MRO series) and most other clubs are running "Formula 400cc" races as opposed to "Supersport 400."
The big difference is that the old "Supersport 400" was for 250cc two strokes and 400 cc four strokes. The new formula rules are for 400 cc two strokes and 400cc four strokes.
With the RS250 / RGV250's lighter weight, better handling, braking and with 400 cc as well this is the breakthrough we have asked for and needed for years.
For the 2008 race season we are offering a full race version of our well proven and popular 300 cc conversion.
We are also working on a range of big bore - long stroke race only conversions.
(Rik Ballerini on our Superbike 400cc Banshee)
Stan Stephens Special Edition Cylinder Heads
Pair of new Aprilia RS250/ Suzuki RGV250 Special cylinder heads. They are a completely new design. The heads are red anodised and feature upright central plugs with detachable combustion-chamber domes. The heads and domes are fitted with 'O' rings, The heads have far greater water volume around the domes resulting in a cooler running engine. The combustion chamber domes use the latest 2-stroke Grand-Prix technology with a dual angle squish area and a toroidal shaped combustion area.We also produce them for our 300cc conversion. We also stock special power-valves and all engine spares.
| SS Cylinder Heads | £395 per pair |
RS300 with our special heads & PV's (75BHP @11,000)
Special Edition Cougar Powervalves
Suzuki RGV250 and Aprilia RS250 Cougar Power-valves, set of four, we will also supply them singularly. No more power-valve problems, these state-of-the-art designed power-valves are vastly superior to the standard ones and elliminate the PV troubles. They have a much improved shape for more power and port gas-flow. They have a high-tech coating process which coats the PVs with a hard wearing almost friction-free surface. The coating also stops carbon building up on the PVs. We produce special heads, 300cc conversions, tuning and engine rebuilds and stock most engine spares.
| Cougar Powervalves x 4 | £395 or £100 each |
Aprilia RS250 / Suzuki RGV 250 300cc Race Tuned Conversion
Our 300cc (61 mm bore) road conversion has been well proven over the last ten years. The main advantages of the 300 are the far wider spread of power and increased torque.
For the 2008 race season we are offering a race 300cc conversion. The main differences will be ; the porting will be our SS400 race porting, the heads will have a higher compression and different combustion chamber shape and a tighter squish clearance. The barrels will be ceramic plated instead of nicosil, and the crowns of the pistons will be ceramic coated.
The conversion will consist of ; overboring your barrels to 61mm and tuning to Supersport 400 spec, ceramic replating the barrels, stripping/modifying/rebuilding the powervalves, remachining the cylinder heads and machining the o-ring grooves. We supply, specially made for us, Wiseco forged race piston kits. The conversion is supplied assembled and ready to go. Just send in the complete top end of your engine. i.e. Heads,barrels,powervalves, complete,head nuts and washers.
If you would rather we rebuilt the engine, we will strip and rebuild the complete engine.
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(Nev Potts on our Aprilia 300cc)
Superteen Racing 2008
For the 2005 race season the rules allowed tuning of the Aprilia RS125, after years of people complaining that some of the machines at the front were tuned, now everyone can have them tuned and the cost is surprisingly cheap, cheaper than a set of tyres!
We obtain a reliable 32BHP at the rear wheel on a properly set up bike. Price £150!!
We also advise that the barrel should be replated and a new piston kit fitted at the same time.
Supersport 400 Race Tuning
Supersport 400 is a race class we have always been involved with. During the late 1980's and early 1990's it was a full British Championship class. We tuned and prepared the engines of the works Kawasaki Team Green KR1S's for John Reynolds and later tuned the RGV engines for Jeremy McWilliams and many other top British Championship riders. Over the next few years the Superteen Series was for tuned RGV's and was run at British Championship meetings. Riders like David Jefferies, Michael Rutter, James Haydon, Darren Mitchell, Jason Vincent and the late John Peacock all emerged from the Superteens.
Since those heady days SS400 racing has been at club and MRO level.
We have been carrying out more extensive Dyno testing on the Aprilia RS 250 and we are now obtaining over 70 BHP using standard carbs and air box!
We are now booking in engines for the 2008 season tuned to our new specifications. Customers can have just the top-end modified or the complete engine.
| Modifying the barrels heads and powervalves | £300 |
| Flowing the crankcases | £100 |
| Stripping/rebuilding / trueing the crankshaft and fitting new centre seal (+ parts) | £50 |
| Stripping/rebuilding engine and gear box (+ parts) | £240 |
| Forged Wiseco race piston kits, each | £70 |
Wiseco Pistons
We have been testing/ developing Wiseco Pistons for the RS250/RGV. The pistons are forged instead of cast, are incredibly strong and last approx 3 times as long in race conditions. They are lighter than standard and are a direct replacement for the genuine pistons. We have had a batch of pistons made by Wiseco exclusively for SS Tuning.
Yamaha YPM (TZR, LC, YPVS)
We have been tuning LC's and their derivitives for nearly 30 years now! In the very popular YPM class we tune the TZR 250 to produce over 60BHP, on a Dynojet dyno, 56 BHP on a Dynapro dyno.
Tuning Price: £300
Mark Parbury on TZR250 at Aberdare Park
Payment c/card or cheque plus allow £12 post and packing
All prices are plus VAT