Lyall O'Brien Montys

[JC]

Yeh, I know its not VMX, but they use the same engines.  Here's some pics, with comments from Lyall on some of his engine wizardry:



"First 250 Classic r/r built. 36bhp @ 8000rpm on alcohol. Built 4 of these in all"




"Early development of 350 r/r. (De) stroked motor by 1mm, 347cc. Riders Craig Morris & Terry Morris. Won 3 Vic titles & 2- 2nd in national titles.  Motor stock put out 38bhp @7000rpm at crank. Final development with pipe photo enclosed & six port cylinder & head work 52bhp @ 8200rpm at rear wheel on alcohol. 38mm Amal. Internal rotor electrics late model Montesa. All genuine montesa parts only used"




"Final development of 250 r/r. (Originally 250 Impala road bike) 26bhp @ 8000rpm at crank (std). Last of 4 built. 38bhp @ 8500rpm at rear wheel on alcohol. 36mm Amal. Approx 12 Vic state titles. 2 national titles. All std Montesa parts used. Bored flywheels to take 20mm crankpin from later model to take INA big end bearing. Since 1991 never had a blow up as the revs were never over 9000rpm"

Interesting info from a Monty tuning wizard!

[Lozza]

Terry Morris still races that 350 I think.

[GD66]

Still racing the 250. Bloody fabulous little bike ridden by an underrated rider. 

Annoying, actually.   >:(A couple of times I've thought I've been going ok at the nats only to have him slip by on the Monty and pull away up the road...   

[SAABCOMBI]

Well, to everybody that knows the 350 or the later 350 4speed racer, l sold that motor to lyall, it was saved by me because it was in a go kart frame in colac and the engine was going to the Colac tip, the people who owned the engine rang me and asked me to come and have a look at this engine to see if l wanted it, so l went over to check it out and new what l was looking at and bought it off the Kids for 20 dollars and took it home and later sold it to Lyall because l new that he was looking for another engine for road racing. Later Lyall told me that the engine was getting 70 bhp out of it.