OzVMX Forum

Marque Remarks => Spaniards (Bultaco, Ossa, Montesa etc) => Topic started by: VMX60 on March 06, 2014, 03:52:51 pm

Title: Ossa flat track project
Post by: VMX60 on March 06, 2014, 03:52:51 pm

Making a start on a Early four speed using a std frame as a base, this is a quick mock up , Big Question do I fit a small front brake or go with the US style no brake .


(http://i58.tinypic.com/2vvsxvp.jpg)

Title: Re: Ossa flat track project
Post by: mike1948 on March 06, 2014, 06:25:07 pm

Are you using a 4speed Stiletto engine?

Title: Re: Ossa flat track project
Post by: matcho mick on March 06, 2014, 07:37:39 pm

use the std ossa small brake,(apart from 090's  8)),it's as good as not having one   ;D ;D, :P

Title: Re: Ossa flat track project
Post by: VMX60 on March 06, 2014, 09:53:40 pm

Yes a 4 speed Stiletto motor as in the Photo but with the correct barrel, mock up has a SDR fitted ,  build will have a bolt up carby

The small Ossa trails front brake assy I have  Which type of 18 inch rim ,Mudcatcher or go with a Phantom rear wheel and match the later alloy rim for the front

Have a set of straight fork yokes to tuck the fork in ,as I do not want to cut the frame

Cheers

Title: Re: Ossa flat track project
Post by: mike1948 on March 07, 2014, 06:41:20 pm

The Stiletto has a good spread of power, not a great top end though.  As I think they advertised - "Faster than some, Quicker than most".  When you've finished playing around on flat dirt with the Ossa, I've been looking for a new project, and I've always liked the Stiletto, the 4spd suits pre70 very nicely.
Mike

Title: Re: Ossa flat track project
Post by: matcho mick on March 07, 2014, 10:31:48 pm

go with the mudcatchers,more the pre 70's look  8), :P

Title: Re: Ossa flat track project
Post by: firko on March 08, 2014, 11:01:15 am

Murray I'd lose the Maico tank. They're too easily identified as being from a Maico and detract from the bikes OSSA origin, putting the "is it a cut down Maico" thought in the viewers head. I'd be searching eBay for some stiletto bodywork or alternatively aftermarket flat track 'glass. Match Mick can help with much of that stuff. The early Dick Mann bikes are gorgeous.....and work well. I don't know how handy you are with a hacksaw and Oxy set but bringing in the steering head to 25-26 degrees will help it turn better but that mods only for the deadly serious and not totally necessary. You can achieve a similar result by running longer rear shocks to raise the rear and bring in the fork angle a tad. Do you have dirt track racing on your side of the island? If your tracks have stop corners, I'd have a front brake but if you use a full oval speedway style track a spool hub would be the go. Even though it's a 5 speed Phantom based bike, I've got a shot or two of Phil Youngs OSSA flat tracker which is extremely effective over here and will give you a good idea on chassis set up. I'll try and dig it out.
                                                                                                        (http://i1112.photobucket.com/albums/k495/firko2/ossatracker_zpsb14d1943.jpg) (http://s1112.photobucket.com/user/firko2/media/ossatracker_zpsb14d1943.jpg.html)
                                                                                                        (http://i1112.photobucket.com/albums/k495/firko2/ossadick-mann_zps7d9305f9.jpg) (http://s1112.photobucket.com/user/firko2/media/ossadick-mann_zps7d9305f9.jpg.html)
                                                                                                       (http://i1112.photobucket.com/albums/k495/firko2/OSSAStiletto_zps56bab482.jpg) (http://s1112.photobucket.com/user/firko2/media/OSSAStiletto_zps56bab482.jpg.html)
                                                                                                        (http://i1112.photobucket.com/albums/k495/firko2/ossa1_zpsddc8d476.jpg) (http://s1112.photobucket.com/user/firko2/media/ossa1_zpsddc8d476.jpg.html)

Quote

use the std ossa small brake,(apart from 090's  8)),it's as good as not having one

That's funny....and true. They've got a well formed reputation as the worst of the worst of front brakes. I have one on my DT1 from Hell.....fluck knows why ;D.

Title: Re: Ossa flat track project
Post by: SON on March 09, 2014, 04:41:06 am

I have a few brand new moulds and tanks that I was going to take to Mick but have not had time.
The T500 needs a tank to be finished

Title: Re: Ossa flat track project
Post by: matcho mick on March 09, 2014, 01:23:17 pm

 8)  :P

Title: Re: Ossa flat track project
Post by: firko on March 09, 2014, 03:31:02 pm

Here's Phil Youngs lethal Phantom based flat tracker that was built up from a basket case ratbike I found somewhere or the other. I had plans of restoring it back to original but Phil had a much better idea.
                                                                       (http://i1112.photobucket.com/albums/k495/firko2/DMR_stiletto_zps6635e03c.jpg) (http://s1112.photobucket.com/user/firko2/media/DMR_stiletto_zps6635e03c.jpg.html)

Title: Re: Ossa flat track project
Post by: VMX60 on March 09, 2014, 10:51:27 pm

Thanks for the replys

Over here in the West NO dirt track, or anywhere to ride a flat track bike, as we only have one very small true bike speedway venue.

So the Ossa is just another of my projects, love the Early DMR Ossa one sweet ride  :)

You are right Firko the coffin tank looks  Maico but it is very small and Alloy

Have replaced the SDR barrel and carby with Early 4 speed bolt up top end .

SON on your post do you have a DMR tank or something else to suit in f/glass ??

This is only a  rough mock up of ideas at the moment  at I still have to finish the Alron on the bench  8)

Title: Re: Ossa flat track project
Post by: steve234 on March 26, 2014, 02:09:29 pm

VMX60,

I'm drawing up some plans for a dirt track venue near Pinjarra right now.

Cheers,
Steve

Title: Re: Ossa flat track project
Post by: VMX60 on March 26, 2014, 10:25:19 pm

Steve

WOW good news for WA. sure hope it gets built.
Just goes to show Never say Never  ;D

Cheers