2T engineering

22/02/2026

Congratulations to Kerry Phillips on his award. Your hard work getting deserved praise .

Pleasure to be assisting you on the motor / tuning side.

10/02/2026

Entries have only just gone live....and already it's fully subscribed. What a great response to this new race class.!

https://www.facebook.com/share/p/17uRwY8U2d/

🚨 2T Engineering Open 500 – Grid Update 🚨

The grid for the 2T Engineering Open 500 is now SOLD OUT 🏁🔥

If you’re trying to book on and can’t get a space, please email Claire in the BEMSEE office with your intention to enter so we can hopefully help you out

[email protected]

Thanks for the huge support — it’s shaping up to be a cracking season for this New to Bemsee Class 💪🏍️

09/02/2026

We had this 3ma in a while back. Adrian described poor running, it had been to a couple of others before coming to us. Running tyga pipes, and snorkels removed. We had planned to fit an ignitech and Adrian had one spare from a previous project.

Our Initial checks identified quite a few issues, including....
The power valve seals causing air leaks. The air solenoid valves were not operating correctly, we identified this was because the throttle position sensor had been fitted incorrectly and failed as a result. Pistons were ready for replacement.

We managed to source a tps from another customer, very lucky as they are rare to find. New wossner pistons and head skimmed to optimise squish. New PV seals and leak test showed crank seals to be good. The clutch side casing was v***r blasted just to clean up appearances.

The engine refitted and started to set up. Initially using the stock CDi to get a baseline. Once jetted to suit no snorkels we can start to look at using the ignitech to really bring out the best. The air solenoid map is customised and it became clear that the improvements found were not enough to get the results we wanted. After some searching we found some rare carburettor parts in Germany. These were ordered and fitted and allowed us to achieve a much better result. 3ma's have a tendency to load up if used in traffic for extended periods, often the effect is quite pronounced. With race style expansion chambers and snorkels removed it only gets worse. Some guys lean out the jetting to compensate but it's a risky strategy as under hard use it's too lean at the top end. Our approach with new carb parts and the air solenoid mapping we keep safe jetting and achieve low end refinements.

Adrian's bike reflects our latest understanding of the 3ma set up. It's taken a lot of time and experience and along the way we have tested several models of the standard CDI across a range of rpm and tps positions. This gave us the basis for ignitech set ups for all models, which we then tune for each bike and its specific set up. In all honesty with the 3ma we have never found 2 bikes that need exactly the same. It goes some way to explain why there's so much debate and contradiction on set up advice.

Finally bike to the owner and he describes it as transformed. After cold starting and riding a slight burble coming through 5k, once cleared it clears and pulls hard and clean.

The bike made really good power and pleased with the performance from the tyga pipes. Being reverse cylinder it of course sounds amazing.😁

09/02/2026

Set of rd500 heads in for repair. A little tricky as one had been damaged and someone had aggressively attempted to bring the damage out with a rotary burr.

With a carefully designed head volume we managed to remove all damage.

12/01/2026

2t engineering 2026 class sponsors for BMCRC Open 500 class.

Open 500 provides a fantastic opportunity for 2 stroke enthusiasts to get on track, 2t engineering is excited to be supporting the riders and helping to develop both the class and the machines. Soon we will be seeing, hearing and smelling the intoxicating buzz of strokers tearing around our favourite circuits, with the UK's best motorcycle racing club.

2T Engineering is proud to be offering sponsorship and support for all 2 stroke riders entering the 2026 Open 500 Championship.

https://www.facebook.com/share/p/1AKb5oNifF/

📣 ANNOUNCING – BEMSEE OPEN 500 SERIES 🏁

Bemsee are delighted to launch the Open 500 class for 2026, and we’re proud to welcome 2T Engineering as Series Sponsor for the 2-Stroke Category.

If you ride, race or build 2-stroke machinery, you’ll want to know about these guys — they keep the two-stroke spirit alive with specialist engineering support tailored to racers, trackday riders and classic performance machines alike.

🔧 2T Engineering Services Include:
• Performance crankshaft rebuilding and truing
• Head work including CNC chamber shaping and removal of detonation damage
• Engine tuning
• Cylinder rebores and replating
• Exhaust repairs and modification
• Programmable ignitions (Ignitech / Zeeltronic)
• Dynamometer testing and tuning services
• O-ring head modifications
• Machining and aluminium welding
• Complete engine building services
• Development work on:
– TZR / TDR 250 / LC / YPVS
– Kawasaki KR1 / KR1S
– Triples: H1, H2, S1, S2, S3
– Off-road engine modifications
– Honda NSR 125 / 250

2T Engineering specialise in finding power and efficiency, rebuilding parts no longer available through dealer networks, and working with you to develop your ideas and designs.

📍 Contact 2T Engineering:
📧 [email protected]

🌐 https://www.2tengineering.co.uk

📱 Reach out for bespoke 2-stroke solutions and support through the season!

🏍️💨

31/12/2025

Happy new year to all my friends, customers and followers.

2025 has been another great year here at 2T, I'll admit updates have been slow recently due, simply due to workload and development projects. But I'll get some really interesting stuff out soon plus some exciting news on the racing front.

I would just like to thank everyone for the continued support, our work is driven by dedication, passion and attention to detail. It's a privilege to be helping so many loyal customers to keep their strokers alive and well.

Looking forward to a super exciting 2026, wishing you all the best for the new year.

23/11/2025

Rd400 Dyno / review

History: The customer had experienced a holed right side piston after a recent rebuild. This was repaired and then unfortunately it holed again during running in. The engine had been repaired for a third time, it then came to us for further investigation.

A wide range of tests and checks were performed including compression tests, carb checks , eventually leading us to check the ignition timing, the static timing was spot on. However when we tested the dynamic timing the left cylinder looked ok, retarding slightly with increased rpm to around 15 Deg at peak power rpm. The right cylinder was found to be advancing to around 42 Deg at peak power rpm. Our conclusion is a faulty newtronics ignition system being the primary cause. We performed a leak down test and confirmed it was air tight, this was to ensure the ignition was a singular fault. The customer has now sourced a v**e ignition/ rotor kit. We will fit that and run in / set up on the next visit.

A lovely little bike with a reliable future ahead ..

22/11/2025

A pair of tdr 250 in for Dyno evaluation and set up.

During pre running checks we found the first tdr had a snapped oil pump cable The owner had been running the motor in and it seems the cable failed just before the Dyno date. Perfect timing and also pleased our pre running checks proved their worth again.

We ran the bike on premix to complete the set up.

The second tdr on the Dyno and by coincidence we found oil pump cable issues. Firstly the alignment marks were off with the powervalves correctly positioned. We then found it was impossible to adjust the cable correctly. It appears that section of the cable has been modified and is too short.

So again we disconnected the oil pump and ran premix. This bike has a carbon airbox, actually quite nicely made but the inlet duct looked too big. We ran the bike up and found it way too lean at full throttle. Checking the jets we found them at 380. Our suspicions on the inlet duct area were correct. We felt the best way forward was a smaller duct. So using our experience and a little bit of maths we came up with a temporary duct restrictor. This was taped to the inlet to prove the concept. We ran the bike and found the aft was spot on!! Not only was it safe but we had only traded 0.5hp compared to the first runs.

The customer will go away and modify the inlet duct accordingly.

22/11/2025

Rd 500 cylinder heads
Sent in for repair due to damage in combustion areas. On closer inspection one chamber had been damaged and then dressed by hand in an attempt to remove the worst damage. However quite a lot of material was removed, lowering the compression and spoiling the squish geometry.

Fortunately we managed to come up with a head profile that cleaned up the damage and optimised volume and squish without resorting to welding or the need for plug spacers. Both heads were skimmed and new profile CNC cut,

One of the coolant spigots was heavily corroded so that was repaired for good measure.

14/11/2025

Rd500 crank damage.

This bike came in a while back for Dyno set up. Our pre running checks found a problem with crank twist. The motor was removed and placed into the queue of engine work.

It was stripped down today and we found both cranks damaged.

The engine had suffered hydraulic lock due to excess oil in the crankcases. When the owner attempted to start the bike it fired and twisted both cranks.

The video shows the extent of twist and highlights the forces that occur.

The lesson...Check your oil check valves !!

07/11/2025

Honda NSR250 mc21. F3 Race kit.

This bike came in for a dyno session and general review. The bike was described as feeling slow on track considering the specification.

The day always starts off with a thourough inspection. We found that although the powervalves cables were aligned to the marks the actual powervalve position was not synchronised. We ran the bike to get a baseline then adjusted the PV to align correctly in the port. This dramaticlly improved performance.

We then fitted a demonstration ignitech unit. This was dialled in and very happy to see another leap in performance. The bike now making really strong numbers and a great curve. Very ridable - should be Impressive on track.

Having proved the bike is capable of performing we set a plan of action. The bike is scheduled come back and we will remake a complete race wiring loom from scratch and install an ignitech. We will pull the heads and check geometry just to ensure the compression ratio is suitable for the fuel the bike is using. Then a final tuning session to pinpoint jetting and ignition settings ready for racing.

As usual I haven't included power numbers, but I have included the Dyno power runs for : as found - blue with power valves corrected - green and with ignitech fitted and optimised. - purple

The area under these curves shows what's really happening without the need to refer to a specific single point horsepower figure.