OzVMX Forum
Marque Remarks => Spaniards (Bultaco, Ossa, Montesa etc) => Topic started by: JC on March 07, 2011, 01:43:33 pm
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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:
(http://api.ning.com/files/-KUL-sawsRWtUtIJgY5MWCs6u1jLALxElysbxie1IkTs*DPU3n-f9D8IJDatVWJ*YhGrJyjIoOBBpDVAZJizV648ibOAj3i2/LyallObrienMontyroadracers1st250Classic.jpg?width=640&height=411)
"First 250 Classic r/r built. 36bhp @ 8000rpm on alcohol. Built 4 of these in all"
(http://api.ning.com/files/1HNjh45gvkl6KhdZpY3V7bg-1tVY7XhWXiyCMSjptVyMEEmK7Co7nF-HRS96NwsycLdd060iob-ftnuytcz9kkWKapRuvXQ-/LyallObrienMontyroadracersEarly350.jpg?width=640&height=425)
"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"
(http://api.ning.com/files/Vz3BouZ6EYJXNfT6Qe*koDALEukWkLO4mbYjAk7NTcmgF*fFAImGRbUkVDuPFe0CLmba-T5Csq85axjNQweuLPnUgcdCpVtZ/LyallObrienMontyroadracersFinal250.jpg?width=640&height=425)
"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!
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Terry Morris still races that 350 I think.
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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... ::)
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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.