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midlifecrisis
 Post subject: Re: xb9 to 12
PostPosted: 17 Dec 2009 23:34 
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Joined: 05 Nov 2009 09:04
Posts: 67
Location: on the back wheel in bony scotland
tubbs wrote:
midlifecrisis wrote:
tubbs wrote:
keep the 9 motor and fit 1050 barrels and you will have a nice strong (ish) motor and imo better than a 12 motor all day long


ah, really, where do 1050 barrels come from, ie what engine/age ect. I'm new to harley buell engines. mostly s/ch car engine I do, but need a change and love messing about with a bike so here I am. any help. advice. options. please feel free.
this came about as I'v bought an xb900r that has knackered g/box, so thinking if going in to fix it might as well do something interesting while there,
btw your input is also appreciated keep it comming :yup:

strip and price gear box repair first as could be a no go :sad1:

yep thats what I intend to do, then decide from there. just trying to learn what can be done if/when time come's.
that link gm posted I take it thats the 1050 barrels you spoke of??
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midlifecrisis
 Post subject: Re: xb9 to 12
PostPosted: 17 Dec 2009 23:37 
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Posts: 67
Location: on the back wheel in bony scotland
greasemonkey wrote:
http://www.nrhsperformance.com/NRHSCATALOG.pdf

GM thanks man, great read :4roz: , I didnt know that was there, I'm not very handy at finding stuff on net :headbang: infact I'm not very handy with computor but learning all time :oooops:
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THE FLYING DUCHMAN
 Post subject: Re: xb9 to 12
PostPosted: 19 Dec 2009 02:03 
Maz wrote:
Different crank, pistons, throttle body,inlet manifold, exhaust, primary ratio.

RH/pinion shaft bearing is a complete nightmare to set up......you will have to be able to measure to 0.0001" and then grind/ lap to same, with.


Midlife, I will give you 100% for what you are trying to do. I have worked on stuff in the past and the cost can mount up big time. Given what Maz and Tubbs say IE - a tolerance of 0.0002" for roundness and taper, it is going to be a nightmare and could be a no win situation unless you are a "top line" engineer. The 9 is one thing the 12 is something else.

I would say fix the gearbox first, if it can be done, and leave it at that because you will end up with a great bike anyway. Messing with a gearbox is a world of pain to start with and doing anything else without proving it could be costly. Trust me on this you might be better just buying a sound XB12 unit, of which I have not seen many about, or a XB9 which there are a few.

Also you will have a problem selling the bike, if you want to, later and there are also the DVLA and insurance issues. All in all it sounds like expensive hardwork, been and done it, to me. Best of luck though.
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midlifecrisis
 Post subject: Re: xb9 to 12
PostPosted: 19 Dec 2009 11:46 
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Joined: 05 Nov 2009 09:04
Posts: 67
Location: on the back wheel in bony scotland
THE FLYING DUCHMAN wrote:
Maz wrote:
Different crank, pistons, throttle body,inlet manifold, exhaust, primary ratio.

RH/pinion shaft bearing is a complete nightmare to set up......you will have to be able to measure to 0.0001" and then grind/ lap to same, with.


Midlife, I will give you 100% for what you are trying to do. I have worked on stuff in the past and the cost can mount up big time. Given what Maz and Tubbs say IE - a tolerance of 0.0002" for roundness and taper, it is going to be a nightmare and could be a no win situation unless you are a "top line" engineer. The 9 is one thing the 12 is something else.

I'm not a top line engineer but a good friend is, and like me he enjoys these challenges ;)

I would say fix the gearbox first, if it can be done, and leave it at that because you will end up with a great bike anyway. Messing with a gearbox is a world of pain to start with and doing anything else without proving it could be costly. Trust me on this you might be better just buying a sound XB12 unit, of which I have not seen many about, or a XB9 which there are a few.

I dont really want a standard 12 unit, and yes they are hard to find a decent price anyway.
I dont mind stripping/building g/box's ;)

Also you will have a problem selling the bike, if you want to, later and there are also the DVLA and insurance issues. All in all it sounds like expensive hardwork, been and done it, to me. Best of luck though.


I wouldn't be selling the bike, this is for my selfish enjoyment if I do it ;) {I have a new waiting to be registered xb12s tbh dont wish to start taking that apart}
please dont think I would be so arrogant as to ask advice guidance from men who know the job, then ignore they'r advice, I have taken on board every word folk have said here, including yourself. been reading on here a few months now and its obvious Maz/Tubbs are the men, hence why I asked before I do anything,
appreciate your concern and input, taa. Tam
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milkster
 Post subject: Re: xb9 to 12
PostPosted: 20 Dec 2009 15:37 
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Joined: 14 May 2009 23:11
Posts: 15
Location: deepest darkest cornwall
Hi Midlifecrisis.
I`ve done the conversion that your thinking of . my reason was the gearbox would jump out of second gear,worn striker dogs and required three gears to fix, I sourced all my parts and gaskets from Chicago Harley,At the time it was a little over $2 dollars to the £, i managed to get an 06 xb12 crank for $175 (£78) second hand but cost £128 to have shipped from Florida in 3 days, you`ll need new primaries headers and pistons ,as the 9 pistons are domed and would give a compression ratio of 12.5-1,the 12 pistons are flat topped ,you`ll also need a 12 throttle body.got mine from ebay uk for £14.99 (bargain) the only problem i could see with the wiring loom is there is no feed for the exhaust valve on the 12 exhaust but i`ve got a heavily modded standard can, i had no issue`s with the crank bearings and all is fine with the motor after several thousand hard miles. if i can be of assistance i`d be only to happy to help...Chris
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pash
 Post subject: Re: xb9 to 12
PostPosted: 20 Dec 2009 20:46 
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proff. patpending
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Joined: 06 May 2009 20:20
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Current ride: Victoria Sponge
Location: Bristol - Gateway to all things good
milkster wrote:
the only problem i could see with the wiring loom is there is no feed for the exhaust valve on the 12 exhaust but i`ve got a heavily modded standard can


Later 9s should have the same loom as an equivalent 12 and have the 3 pin plug under the seat for the exhaust valve (but then you will need the valve and the cable and the exhaust)...

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midlifecrisis
 Post subject: Re: xb9 to 12
PostPosted: 20 Dec 2009 23:07 
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Joined: 05 Nov 2009 09:04
Posts: 67
Location: on the back wheel in bony scotland
guy's thanks for your input, every wee bit helps and is appreciated :yup: . tam
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