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Author Topic: Bultaco Mk11 250  (Read 11656 times)

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Offline Alisdair

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Bultaco Mk11 250
« on: January 03, 2014, 08:43:13 pm »
Pulled my father's 78' Frontera 250 out of the shed after 20 years of it sitting in there(Does have light surround, I took it off). He bought the bike in milk crates.
Rebuilding most of the bike, hope to take it to some events with my dad. Also turns out this bike is a 6 speed.






Before and 1/2 way through


Have to sort out timing, sort out the carb and other small things
Might be interested in parts for this model if anyone has some
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Offline Iain Cameron

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Re: Bultaco Mk11 250
« Reply #1 on: January 03, 2014, 09:05:26 pm »
I like the flash alloy tank .
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Offline matcho mick

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Re: Bultaco Mk11 250
« Reply #2 on: January 03, 2014, 10:13:11 pm »
i'm struggling with the 2nd picture up  :o,i've had too much merlot i'm thinking  ;D,is it gear,or primary chain driven 6 speeder?, :P
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Offline GMC

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Re: Bultaco Mk11 250
« Reply #3 on: January 03, 2014, 10:32:35 pm »
I reckon these Fronteras are a great looking bike but part of that look is the original tank.
I like the alloy tank but I'm not sure I would use it on this model, still, it's your build so do as you please.
The rebuild seems to be coming along nicely, will we see you both at a Vic Vinduro this year?
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Offline Iain Cameron

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Re: Bultaco Mk11 250
« Reply #4 on: January 03, 2014, 11:26:14 pm »
The 370 is nice too . Iain
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Offline tony27

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Re: Bultaco Mk11 250
« Reply #5 on: January 04, 2014, 08:19:30 am »
Quote from: matcho mick on January 03, 2014, 10:13:11 pm
i'm struggling with the 2nd picture up  :o,i've had too much merlot i'm thinking  ;D,is it gear,or primary chain driven 6 speeder?, :P
Reversed image?
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Offline Alisdair

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Re: Bultaco Mk11 250
« Reply #6 on: January 04, 2014, 01:11:21 pm »

Really want to go to some Vinduros but I don't know of many that are in/close to QLD (I live near Brisbane)
Primary chain 6 speed, compared bottom end it to a PURSANG 125 and there are heaps of small differences throughout it.




Good looking 370, any idea on the numbers made?
The 250 motor was running a 125 flywheel and motoplat for some reason, took some serious digging through the shed to find the original.

There is a pin hole on the top of the original fuel tank, I am going to use the aluminum tank until I repair it
Need to fix the hole and put some sort of sealer though the fuel tank.

I am not 100% sure if I am going to repaint tank and side panels, as I don't want to worry about damaging the paint just yet.

I am aiming for this bike to be as original as possible, so far just about all the bolts in the bike are ''Bultaco'' bolts.
Missing a few things on it, like the light, speedo center stand and original shocks

Going to see if I can get spark today, but its bloody 42°C
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Offline firko

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Re: Bultaco Mk11 250
« Reply #7 on: January 04, 2014, 01:26:33 pm »
Cool project....I always liked those blue Fronteras.
Quote
i'm struggling with the 2nd picture up  :o,i've had too much merlot i'm thinking  ;D,is it gear,or primary chain driven 6 speeder?, :P
Merlot's a very metrosexual wine choice Mick...I always had you figured for  a flagon port kind of bloke ::).  How'd you go with that silver metalflake Trackmaster tank Jimmy took up to you Mick? Is it a suitable mould candidate without flucking up it's nice gelcoat ?
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Offline Alisdair

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Re: Bultaco Mk11 250
« Reply #8 on: January 04, 2014, 04:35:16 pm »
Not getting any power from the bloody thing, going to get my Dad to look at it.
Hopfully the motoplat hasn't shi* itself. 
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Offline lyle2212

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Re: Bultaco Mk11 250
« Reply #9 on: January 04, 2014, 07:06:40 pm »
I've got a few spare tanks in my garage, as I am doing up the same bike and also a Gold medal..(mk10), let me know what you need.   Those old fibreglass tanks deteriorate and need to be re- fibreglassed from the inside as well as the outside.    I've also got a spare seat with new cover. Regards lyle.
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Offline Alisdair

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Re: Bultaco Mk11 250
« Reply #10 on: January 04, 2014, 08:51:09 pm »
That is great! Roughly how much would you be after for a tank just for future reference? I guess it would allow me to fully repair one.

My seat base isn't the best, going to require some welding and some fiberglass to strengthen it up.

I am trying to keep the bike cost down to a minimum .

Plastics, genuine seat cover, fork seals, rings and a filter are the things I have bought
(guess there is really not that more anyway).



Would like to see some pictures of your bike just to see how everything should look on it.

Looks like the 250 motoplat isn't working, not getting power from it.
Going to put the 125 flywheel and motoplat back on it until I can figure out why   :-/ Maybe that is the reason it had it on in the first place.

Going to be a really snappy bike
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Offline Alisdair

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Re: Bultaco Mk11 250
« Reply #11 on: January 04, 2014, 08:53:48 pm »



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Offline Alisdair

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Re: Bultaco Mk11 250
« Reply #12 on: January 04, 2014, 10:02:07 pm »
Seems that it might be the coil. Now to figure out how to test it.
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Offline supersenior 50

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Re: Bultaco Mk11 250
« Reply #13 on: January 05, 2014, 08:38:20 pm »
Alisdair, Vinduro PanPac Masters Games 1st and 2nd Nov. on the Gold Coast
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Offline Alisdair

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Re: Bultaco Mk11 250
« Reply #14 on: January 05, 2014, 10:04:08 pm »
Thanks heaps supersenior 50
Have something to aim for now
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