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Pogue_mahone
Posted on Saturday, August 01, 2009 - 01:44 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

i need some.
was pondering ......get a 1200 engine and swap it in.
what say you?
also thought of a wrecked bike for the engine and part out the extras that are still useable.
can i just get 1200 pistons and do it that way?
thanks

Scott
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Ochoa0042
Posted on Saturday, August 01, 2009 - 02:20 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

it be cheaper to get 1200 connecting rods and reuse your XB9 pistons. and you can reprogram your ECM with a XB12map. easy. My guess is that it will be a under$500 project if you go that way. versus a $2000motor swap

Best ignore this little gem of advice as it would result in a compression ratio on par with that of an old women suffering from acute emphysema.

Blake


(Message edited by blake on August 01, 2009)
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Fast1075
Posted on Saturday, August 01, 2009 - 07:13 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Brad...the difference in engine size between the 900 and 1200 is from the longer stroke in the 1200....you will need a crankshaft assembly convert your 900 to a 1200 if you plan on using stock cylinder bore.

The cheapest way would be a used engine...unless you can find parts really cheap and you have the tools and equipment to do the engine mods yourself.

A more expensive alternative would be to use a big bore kit...but I'm pretty sure that a 1200 bore kit will required complete engine teardown and boring of the cases to fit the much larger jugs.

With the short stroke of the 900...(same as a Blast) the engine with the big bore would be able to rev higher than the regular 1200 engine...
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Pogue_mahone
Posted on Saturday, August 01, 2009 - 11:43 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

hey fast
i am hip to engine stuff,just not this particular type.was not sure the 2 different displacements were made just by stroke length.just for the sake of extra parts i think i would do well to seriously consider a used engine or just find a totaled xb12.extra parts are never a bad thing, and having extra hardware etc would be good too.mine is an 03,and that would be a good way to get updated on my belt drive as well.
i was reading up on engine stuff,and v twin parts are stupid expensive.i love the reliabililty of good stock engines,so i doubt i'd ever have any interest in a lot of pricey engine work.these engines make a stupid amount of power as is,and any more will likely start making the life span shorter.
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Miko_k
Posted on Saturday, August 01, 2009 - 12:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

An 03 XB9 engine with XB12 rods will still be breathing through the small Throttle Body and using the small headers and muffler ; )
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Slaughter
Posted on Saturday, August 01, 2009 - 01:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

The XB9 motor is a 3.125 stroke - Blast is a bit more (don't know off my head)... XB12 is 3.81

In my opinion IF you can afford the mods, the short stroke/big bore XB9 with the 3 13/16 bore makes a "racier" engine. It DOES require boring the cases (about $250 - $350 depending on where/who) and then you really do need to at least get the XB12 throttle body/injectors.
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Pogue_mahone
Posted on Saturday, August 01, 2009 - 02:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

thanks miko--maybe just sourcing an entire xb12 might be best.
and dont the later engines have better oiling and bearings?
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Ochoa0042
Posted on Saturday, August 01, 2009 - 02:27 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

ah my bad, didnt think it through
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Fast1075
Posted on Saturday, August 01, 2009 - 05:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Nope...Blast stroke is 3.125....same as the XB9.

The 08 and better XB engines have better bearings and such.

(Message edited by fast1075 on August 01, 2009)
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Slaughter
Posted on Saturday, August 01, 2009 - 05:14 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Gotchya there on the Blast stroke. Just didn't know the bore/stroke for the Blast and was too lazy to google it.
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Fast1075
Posted on Saturday, August 01, 2009 - 05:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I may (or may not) yet get a 3.81 stroke crank built and use the big bore cylinder with a full on XB head and serious cams for a 50+ hp Blast engine...just for grins n giggles.

(Message edited by fast1075 on August 01, 2009)
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