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Buell Forum » XBoard » Buell XBoard Archives » Archive through November 12, 2009 » XB9 pistons in XB12 daily drivable? « Previous Next »

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The4ork
Posted on Wednesday, November 11, 2009 - 02:44 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

just looking at the option as i have sourced a set of 9 pistons for dirt cheap, and im getting ready to do a tear down of the motor anyways.

i drive around daily usually with about 1/4 tank of 100 octane low-lead and the rest 91. mine is on an older S1 motor, but i figure you guys prably do this mod often, just looking for some insight.

of course i cant do computer tuning so im a little bit limited, but i can keep the mixture fat and back the timing off a few degrees if i need to
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Nillaice
Posted on Wednesday, November 11, 2009 - 04:25 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

i thought the pistons were the same.

since 9's crank is a shorter stroke, they have longer connecting rods
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Puddlepirate
Posted on Wednesday, November 11, 2009 - 06:52 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Pistons aren't the same. The 9 pistons are domed while the 12 pistons are nearly flat.
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Glitch
Posted on Wednesday, November 11, 2009 - 06:52 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

i thought the pistons were the same.

since 9's crank is a shorter stroke, they have longer connecting rods


Nope, and Nope...

The pistons are different.
9 pistons in a 12 will raise compression.
The con rods are the same size, it's the crank that is different.

XB9 pistons in XB12 daily drivable?
As far as I've read, yes.
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Hogs
Posted on Wednesday, November 11, 2009 - 07:14 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Yes, I believe many have done this and drive them daily, with no worries,I think some have just adjusted their timing abit , but not sure on that, all else being stock like... except the basic mods everyone does...
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Bads1
Posted on Wednesday, November 11, 2009 - 07:19 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

No unless your running race gas.
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Fast1075
Posted on Wednesday, November 11, 2009 - 08:18 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Will XB pistons work with S1 heads??? Aren't S1 heads open chamber....and XB heads bathtub chambers?...

(Message edited by fast1075 on November 11, 2009)
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Vagelis46
Posted on Wednesday, November 11, 2009 - 09:16 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I use XB9 pistons in my XB12.

Firstly I thought it was great with 98-100 octane gas, more power no "pinging". Then one pretty hot day about 25-28Celsius I pushed the bike hard and there was some serious "pinging".

After that happened, each time I go for a "fast" ride or to the track I use octane boosters and I am very happy. The bike is flying and no "pinging"...
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Barker
Posted on Wednesday, November 11, 2009 - 11:41 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Fuell becomes an issue at 14:1 ish compression ratio.
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Rocketsprink
Posted on Wednesday, November 11, 2009 - 02:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Paul James ran his 12 race bike with 9 pistons on pump gas. However, the ecm was reprogrammed which I'm sure stop the "pinging"

(Message edited by rocketsprink on November 11, 2009)
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Fast1075
Posted on Wednesday, November 11, 2009 - 04:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

If I were you, I would call Cycle Rama and ask them if XB pistons will work in an S1 engine....the heads ARE NOT the same on an S1 and XB...For what little I know, the pistons have to match the heads.
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The4ork
Posted on Wednesday, November 11, 2009 - 09:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

sorry i should have specified... i have nrhs stg3 XB heads and xb12 cylinders
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Hogs
Posted on Wednesday, November 11, 2009 - 09:40 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

The4ork,
Sorry they won`t Work..But I know someone that will take em off your hands... j/k
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