Dirty Deeds...
Classic Motorcycle Mechanics|December 2019
Done dirt cheap… CMM reader Keith Dickinson restores and rebuilds Honda’s CRM250 AR.
Keith Dickinson
Dirty Deeds...

When I first got bikes we used to go off-road quite a lot. However, my Casalsports moped and later a Honda CB175 were not much use compared to some of my mates who had pukka off-road bikes!

I had always hankered after a proper off-roader, but it was not until I got to 47 that I managed to scratch that particular itch. It had to be a twostroke, and preferably an interesting one to complement my RG500. A search revealed that the Honda CRM250 was generally considered to be the best road-legal dirt bike from the 90s. The bikes were never officially imported into the UK, but many were brought in by Leisure Trail in Nottingham and are quite common.

The last of the line was the Active Radical (AR) version, which was Honda’s last attempt to clean up their two-strokes using technology pioneered n their successful EXP-2 (440cc) Paris-Dakar race bike. The technology was claimed to clean up the bike so that emissions and economy were comparable to an equivalent four- stroke. This was achieved using a modified exhaust valve that increased compression markedly when fully closed. In fact, compression is increased so much with the valve fully closed that autoignition/detonation occurs triggered by free radicals and the bike will run without a spark.

Bu hikaye Classic Motorcycle Mechanics dergisinin December 2019 sayısından alınmıştır.

Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.

Bu hikaye Classic Motorcycle Mechanics dergisinin December 2019 sayısından alınmıştır.

Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.

CLASSIC MOTORCYCLE MECHANICS DERGISINDEN DAHA FAZLA HIKAYETümünü görüntüle
Classic Motorcycle Mechanics

Honda VFR750R - RC30

If there’s a more worshipped V4 out there, we’ve yet to see it: welcome to our reboot of the awesome VFR750R RC30…

time-read
2 dak  |
September 2021
Mountain tension!
Classic Motorcycle Mechanics

Mountain tension!

Award-winning motorcycle engineer!

time-read
5 dak  |
September 2021
Fazer set to STUN!
Classic Motorcycle Mechanics

Fazer set to STUN!

What do you get when you mix CRK’s lovely café racer kit to Yamaha’s budget middleweight and the recently-retired Martin Fox? Well, one helluva foxy Fazer!

time-read
6 dak  |
September 2021
Project Suzuki 1984 RG250 part 4 BRUNO BARES ALL!
Classic Motorcycle Mechanics

Project Suzuki 1984 RG250 part 4 BRUNO BARES ALL!

This month, while we wait for backorder engine parts, we strip the chassis back to the bare frame, assess what is needed and plan the reassembly…

time-read
6 dak  |
September 2021
Project Kawasaki Z900 Stocker part 2 Ralph has a blast!
Classic Motorcycle Mechanics

Project Kawasaki Z900 Stocker part 2 Ralph has a blast!

For the best finish on his Z900’s motor Ralph wants the best, so he visits Stephen Smethurst Casting Renovation to find out how it’s done properly.

time-read
10 dak  |
September 2021
Project Suzuki TS400 Part 8 Loom with a view!
Classic Motorcycle Mechanics

Project Suzuki TS400 Part 8 Loom with a view!

We’re getting down into the nitty-gritty this time with component testing and loom building. What could go wrong?

time-read
6 dak  |
September 2021
Project Yamaha TX750 Part 12 A question of balance…
Classic Motorcycle Mechanics

Project Yamaha TX750 Part 12 A question of balance…

Only The Beach Boys had good vibrations… so what’s Mark been up to, to sort out the bad ones coming from his TX750?

time-read
6 dak  |
September 2021
Splitting links
Classic Motorcycle Mechanics

Splitting links

Ralph Ferrand works with tools all day long – he sells them too at bikerstoolbox.co.uk so he knows what works.

time-read
4 dak  |
September 2021
Classic Motorcycle Mechanics

STAVROS: PRINCE OF PRANKSTERS!

It’s probably fair to say that Stephen JamesParrish’s persona and overall levity throughout his life have muddied the waters as to just how good a bike racer he was back in the day.

time-read
1 min  |
September 2021
Metal magic!
Classic Motorcycle Mechanics

Metal magic!

Ralph Ferrand works with tools all day long – he sells them too at bikerstoolbox co uk so he knows what works.. .

time-read
3 dak  |
July 2021