MDA Motorcycle Engineering

05/03/2026

Finally got the vincent heads machined and assembled even nailed on to the bottom end. Next up is the cam timing ( can’t wait ) 50’ V twin I’m up for it , I have no paperwork that the new cams should have ( it’s all new parts) but I’ll get there , I can work it out .

23/02/2026

It’s been a while since the last post. But here I’ll try to explain about the 2 x Vincent heads I’ve had to do for some time now . These heads and the valve operation are like no other. Vincent use 2 valve guides on each valve , of different internal diameter a top and bottom ( conventional is in the head, retained by a screwed lock ring ). The rocker arm is placed in between the 2 guides. Pushing on a collar and pulling the valve spring down . Now of course everything has to be totally aligned. The valve seat angle again is Vincent at 30 degrees not the usual 45 degrees . Take a look the alloy spring base doubles as the top valve guide. Tricky s**t. ! 😊

02/02/2026

Watching you tube. I know som stuff but this one has got me 😂 wtf is going on here

06/01/2026

Well I brought 2 x Mudguards in my hand luggage 18 months ago just started to see how they will fit on my 1906 Clipper

30/12/2025

I just made this akrapovic pepper pot muffler for mi 1906 today. Linked up on the dyno and power commander I should get 2 hp

14/12/2025

What great work by John Hand

13/12/2025

Nice gesture from our rudolf. !

04/12/2025

Time to make another clutch

02/12/2025

Just finished today this pre war BSA cylinder head made the valve guides then machined the head and installed 2x valve seat rings

14/03/2025

this is something ive done a few times before but the wider audience should follow , girder fork , steering head bearings , just not available and many times the head crown is integral as a bearing , there are common bearings from the local shop but need altering to suit the frame / forks whatever ...this all takes time and thought but the pictures give an idea what we are talking about 1st pic is the indented originals the rest are the solution

11/03/2025

this is my machine , i totally and firmly believe this IS Wal Handley's 1927 racing engine that he used in the 1927 TT , i have a couple of spare engines 1927 OHV (available for sale) that look like this one but this racing engine is so different , i know the many claims to this have been made in the past but this IS the one , the case numbers are CTA the T being larger the other 1/2 is stamped the same the T being TT . C being 350 (A 175 B 250 ) A 1927 ok the cases have offset mounting lugs and lots of webs for increased strength (unlike the plain std cases) . The offset is to keep the motor in line to the clutch because the drive side roller is a double bearing (std is single roller ) and the timing side utilises the std d/s roller (no bronze bush here ) the crank is a larger pin with double rollers ( hand made cage ) and a longer than std alloy rod (not steel) the flywheels are larger than std and polished also stamped exp3 the cylinder is longer than std because of the longer rod . the cam is a separate lobe that screws on to the shaft (the timing figures are like a speedway bike ) . there is more to this engine than meets the eye the gearbox from memory stamped ETTA every gear is stamped TT no kick start the carburettor is an AMAC TT racing version its not what people have claimed before this is the a racing machine unlike any other Rex Acme.

Rex-Acme were formed in 1922 when the Rex Motor Manufacturing Co. and Acme Motor Co. collaborated. A range of motorcycles were offered throughout the 1920s that used both in-house-built, and propri…