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what is the difference between a 929 and 954, can i turn my 929 into a 954 simply by oversize pistons, or is the stroke different? just curious for when i go through the engine
 

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All the info is here, because I read about it here years ago. But yes, I think you can bore a 929 to 954.
 

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Yep, same stroke, same head, different cams, ECU, harness, throttle bodies.
I'm planning to build a 954+ engine for next season. Got an engine arriving from the US next week.
 

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Nope.
I'm running 954 throttle bodies on my 929 at the moment.
I'm looking for a 954 ECU and harness to try just to see if it talks to the injectors any better than the 929 does but I'm not expecting to see much difference. The cams are only _slightly_ higher lift in the 954 so it wouldn't be worth buying them secondhand in my opinion.
Unless your engine has to come apart for some reason, stripping it to bore it 1mm, replating it, new pistons and rebuilding it is a lot of time and money for very little gain.
You'd be _much_ better off putting the money into a full system, PC3, 954 throttle bodies and a set of aftermarket cams in my opinion. If you wanted more pull the head off and mill and port it as well.
 

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I know the 929 and 954 can both be over-bored 1mm.
I don't yet know if a 929's 74mm liners are thick enough to be over-bored 2mm (954 +1mm) but I would expect they can't - at least not without compromising reliability.
Theoretically, you only need bore the 929 2.5mm to get a 1000cc motor that's a couple of kg lighter than a 1000RR motor.
 

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I know the 929 and 954 can both be over-bored 1mm.
I don't yet know if a 929's 74mm liners are thick enough to be over-bored 2mm (954 +1mm) but I would expect they can't - at least not without compromising reliability.
Theoretically, you only need bore the 929 2.5mm to get a 1000cc motor that's a couple of kg lighter than a 1000RR motor.
2.5mm is nice but from what I under stand, the 929s can only go 1mm before it gets to thin around the water jackets in the block.
 

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Yeah. I'm inclined to go with stroking the crank instead.
Stroking the crank 4mm makes a 929 997cc and a 954 1024cc.
Until I get a 954 engine here in bits (within a couple of weeks) I don't know how far it can be bored or stroked so, if anybody knows please let me know :)
The next job is finding rod specs to see if there are any OEM rods 2mm shorter and ideally with 32mm bigends (to save welding up the crankpins).
Can anybody tell me the length of OEM 929/954 rods and the width of the journal?
 

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is there any benifit to having a 929 other than personal taste in looks? im 954 all the way
Not that I can see although 929's are probably slightly cheaper?
 

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Why not just buy a newer liter bike?

That may be another option depending on what is you're trying to achieve.
For me, I get far more enjoyment out of building a bike I already have into something else than I ever would out of simply buying somebody else's idea of what I want :)
 

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It's true, building is more fun. Buying a ready bike is better value.
I agree, as long as you don't buy new or finance it :)
Either of those will cost you more than you would sink into improving your older bike.
 
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