Bultaco Astro m163 1976-1977

[RW490]

Hey guys I have pulled the old chassis out of the shed and need some help from forum members. I am in the process of doing up my Bultaco Astro 250 1976-1977 model number 163.

As this bike originally has no front brake as std and most have never had a brake fitted to the front begs the question. Can this bike be raced in the pre 1980 class Australian flat track championships with no front brake. The rear brake std is a hydraulic disc and if I want to fit new wheels and hubs, where do I stand under the current rules. I would hate to change the original design.

Also it will be fitted with a Pursang 360 motor as this is all I could find.

Can anyone help me as I am out of touch with the rules.

Regards Rick.

[steve234]

Current rules say brakes front and rear. It was made pre 78 so should be eligible for pre78?

Cheers,
Steve

[jimg1au]

yes even hagons need 2 working brakes as well
jim

[supersenior 50]

Yes, as above. There is no Pre80 class in the MoMs so you fit nicely into Pre78. Congratulations, they are an iconic model

[cemotobull]

Rick,

When it's time to sell, let me know!!!

[yamaico]

Hey Rick,
I put a conical Yamaha front hub in my Astro. Very easy to find, cheap and they work well.



Used the same hub in my RD:

[steve234]

Does an Astro jug fit on a pursang?

[steve234]

How early did the twin pull yammy hubs come out?

[yamaico]

Does an Astro jug fit on a pursang?

Sure does - good thing about Bullys, heaps of mix and match.

How early did the twin pull yammy hubs come out?

YZ465G I believe. Too new for pre '78.

[firko]

I use the same hub in my 360 Yamaha short tracker too.
                                                                               

[RW490]

Thanks for the info guys, it's much appreciated. I read the full rebuild story on the RD last night and was amazed at your attention to detail. It's a credit to you.

I am also interested in what size 19" rims are on the Astro, ie 1.65 / 1.85

I am going to fit new wheels so I want to get it right.

Feel free to put any or all pictures of your bikes up as I am toying with having my frame jigged and then selling unpainted Astro copy chassis without engine mounts so that you can fit any motor from scratch and the geometry will be spot on.

Hope to get some feedback, thanks again guys.

[jimg1au]

over the years i have been looking at usa flattrackers i have seen all sorts of motors in astro frames even xt500 yamahas
most of the guys over there think i am mad taking out a fast cr250 1973 motor to slot in a astro motor in my champion.an astro new frame would go perfect with my new astro motor.now how do i get the rest nos
jim

[yamaico]

I have 2.15 rims on mine Rick but it's more about what I can find than the actual size, although they look good and the tyres fit up well. You could most probably get away with 1.85's but I wouldn't go any smaller than that.
I think you would be on a winner making frames, as the Astro works regardless of the motor.
Let me know if you need any dimension checks or any other information,
Pete.

[Slider29]

G'day Rick,
I know somebody that would be very interested in one or two frames if you went ahead with your
plans. Keep us posted. The Astro is a great looking bike. Do you have the fibreglass? If so,... that same person would be keen to do some moulds/forms. Hmmmm,,.....
regards  Mark

[jimg1au]

why dont you just get the finished product from forum member matcho mick(moto tumbi fiberglass)he has molds for most things
jim