Rare

[cappra]

The lower forklegs look correct, but the tubes should be sticking up thru the top crown about 63mm.
The VA360 had the same bottom end as the VB's.  Different crank wheels, rod and main bearings than the 250.
In over 35 years, I never had a 250's bottom end go south.   Are you guy's running nitro?

[Stan S]

Hi Cappra,
did you have a 76 model 250? If so how did you stop the big end problem that I had from the day I picked it up new. Lyall couldn't fix it how did you fix it?

Stan.

[cappra]

Stan,
I had a VA 360. (still have it!)  When I had problems with the crank mounted clutch,
I yanked the motor out (until the fix came thru) and installed a 250, that I raced for almost 6
months.  Never had any problems with the big ends.  We set them up stock by the book.  We used
Belray oil mixed at 32 to 1.  I worked at the Montesa dealer for five years and I cannot recall any
bigend failures in all that time!  If the rod was not centered correctly or the piston shims were not
correct, the rod could shift to the right or left and catch the edge of the crankwheel and then all hell
could break loose!  but that is something we alway's checked carefully when rebuilding.

[k2000x]

ive got one of these beasts..not as clean but good for its age...it still has clutch on crank i need to pull motor down for new mains any secrets on pulling it apart..eg. reverse threads

[Stan S]

Hi K2000X, I am probably not much help as it would be more than 30 years since I have has one of these apart. I am a bit envious as these are getting very rare. 

Stan.

[All Things 414]

ive got one of these beasts..not as clean but good for its age...it still has clutch on crank i need to pull motor down for new mains any secrets on pulling it apart..eg. reverse threads

As far as I'm aware, just the flywheel and the sprocket nut should have reverse threads. When you split the cases, do it with the ignition side down (clutch side up). All the gears will sit nicely in the RHS case that way.

[cappra]

What "all things 414" say's is correct.  Nice that the primary gear is splined!  Just pay attention to all
the various transmission shims.  The crankshaft tends to remain in the left side case for some reason as well.

[mx250]

$3050 . A pretty good price for unrestored - seems it rarity was acknowledged. 

[montman]

Talking about a75/76 i had one of each 250cc i raced 75 in 1975 and 76 in 1976 in expert class always gave them a hard time but they never let me down used to finish in top 5 all the time.I still have the montesa manual issued with the 76 bike never put a piston or big end in,in fact never had the motor apart in the whole season what great bike's.

[Stan S]

Talking about a75/76 i had one of each 250cc i raced 75 in 1975 and 76 in 1976 in expert class always gave them a hard time but they never let me down used to finish in top 5 all the time.I still have the montesa manual issued with the 76 bike never put a piston or big end in,in fact never had the motor apart in the whole season what great bike's.

Gday montman,
Yeah mine was a 76 250 but although it was very fast I never had a good run with it at all. I had a 250 in 74 and apart from the handling it was a very reliable bike. I sold and raced VB's and VE's from 77 on and had very little mechanical trouble at all. My favourite was a 78 VB 250 5 speed with a 360 head, barrel, carb and pipe.
I guess I must have had a lemon in 76, maybe I didn't ride it fast enough.

Cheers Stan.

[montman]

Hi stan i think you must have had a LEMON,my mate had a 360 which had a hand made up and over pipe on it the first we had seen i can remember riding it wow an instant wheely machine i always rode 250's untill the 414ve came out then rode both class untill end of 1980 very bad crash right leg nearly amputated(ouch) 18 months in full plaster by that time montesa had gone over to honda(shame)but i had orderd one of the first water cooled honda 250 bikes to come in the country just before crash had to cancel it dealer not impressed.The 4 speed box on 414's suited my style of riding(lazy)did not like to go up and down the box all the time,the monts used to rev and rev where as other make's that i tired/borrowed seemed to peak off.where's all the other monty nuts?


                                                                                                      Montman 

[Stan S]

Hi stan i think you must have had a LEMON,my mate had a 360 which had a hand made up and over pipe on it the first we had seen i can remember riding it wow an instant wheely machine i always rode 250's untill the 414ve came out then rode both class untill end of 1980 very bad crash right leg nearly amputated(ouch) 18 months in full plaster by that time montesa had gone over to honda(shame)but i had orderd one of the first water cooled honda 250 bikes to come in the country just before crash had to cancel it dealer not impressed.The 4 speed box on 414's suited my style of riding(lazy)did not like to go up and down the box all the time,the monts used to rev and rev where as other make's that i tired/borrowed seemed to peak off.where's all the other monty nuts?


                                                                                                      Montman 

I'm sure they are out there waiting for someone to say something that doesn't add up then they seem to surface.

Regards Stan.

[Stan S]

Hi stan i think you must have had a LEMON,my mate had a 360 which had a hand made up and over pipe on it the first we had seen i can remember riding it wow an instant wheely machine i always rode 250's untill the 414ve came out then rode both class untill end of 1980 very bad crash right leg nearly amputated(ouch) 18 months in full plaster by that time montesa had gone over to honda(shame)but i had orderd one of the first water cooled honda 250 bikes to come in the country just before crash had to cancel it dealer not impressed.The 4 speed box on 414's suited my style of riding(lazy)did not like to go up and down the box all the time,the monts used to rev and rev where as other make's that i tired/borrowed seemed to peak off.where's all the other monty nuts?


                                                                                                      Montman 

I'm sure they are out there waiting for someone to say something that doesn't add up then they seem to surface.

Regards Stan.

see what I meant now montman?

Regards Stan